Guide to supportive care in critical illness

Rapid Reference 🚀
The understated importance of high-quality supportive care
Medications to avoid in ICU
Prophylaxis
- DVT prophylaxis
- GI prophylaxis
- Analgesia & pain management
- Sedation of the intubated patient
- Delirium prevention
- Noninvasive respiratory support (HFNC & BiPAP)
- Monitoring: saturation, ABG, VBG, & etCO2
supportive care in ICU, extremely brief version

DVT prophylaxis 📖
- All ICU patients should receive DVT prophylaxis unless there is a contraindication (e.g., hemorrhage, platelet count
- GFR >30 ml/min: Generally enoxaparin 40 mg daily.
  - Weight
  - Weight >120 kg: consider ~0.25 mg/kg q12hr.
  GI prophylaxis 📖
  - As a simple rule of thumb, use GI prophylaxis only for intubated patients.
  - Preferred agent is pantoprazole 40 mg PO/IV daily.
  Medications to avoid in ICU 📖
  - NSAIDs (renal failure, bleeding).
  - ACEi/ARBs (avoid unless there is a specific strong indication for them, such as flash pulmonary edema or severe systolic heart failure).
  - Fluoroquinolones. 🌊
  - Benzodiazepines, zolpidem, diphenhydramine (delirium). (However, for patients on these medications chronically they often must be continued).
  Anemia 📖
  - Avoid transfusions if hemoglobin is >7.
  - Only transfuse one unit at a time (unless hemodynamically unstable, or severe anemia).
  Glycemic control 📖
  - Hypoglycemia can kill patients so the most important thing is to avoid doing that.
  - Optimal glycemic targets are debatable, but possibly might be:
    - Non-diabetic patients: 140-220 mg/dL.
    - Diabetes with A1C >7: 180-250 mg/dL.
    Volume status & hypotension 📖
    - ICU patients usually retain fluid and develop volume overload.
    - Avoid giving fluid boluses unless the patient is clearly volume depleted.
    - Follow I/O balance daily and avoid progressive volume overload (e.g., with diuresis).
    Hypernatremia 📖
    - Hypernatremia should not be tolerated , as it will make patients delirious and miserable (thirsty). (One exception = intracranial pressure elevation.)
    - Calculate the amount of free deficit 🧮 (otherwise we tend to underestimate water requirements).
    - Provide free water in the form of oral water (e.g., via enteral tube) or as D5W intravenously.
    Hypokalemia 📖
    - Generally target K>3.5 (not >4, this makes your life easier!). 📖
    - Whenever possible use enteral potassium (it's safer and doesn't sclerose veins).
    - Be cautious in renal failure.
    Hypocalcemia 📖
    - Most critically ill patients are hypocalcemic, and the best thing is usually to ignore it.
    - Avoid administration of IV calcium in response to a low calcium level unless the patient is symptomatic or the ionized calcium is extremely low (e.g., perhaps
    - IV calcium is relatively contraindicated in hyperphosphatemia (risk of calciphylaxis).
    Troponin & ischemic eval 📖
    - Screen for ischemia with a good history and careful evaluation of the EKG.
    - Don't measure troponin unless there is a legitimate concern for MI based on history and/or ECG and/or echocardiogram.
    - Most critically ill patients will have elevated troponin levels. Checking troponin on every patient will generate false-positive results and lead to iatrogenic harm.
    Fever & blood cultures 📖
    - Avoid cultures that often provide misleading, false-positive results:
      - Avoid urinalysis & culture from an indwelling foley catheter , unless there is urinary obstruction or recent urological surgery. 📖
      - Among intubated patients, avoid checking an endotracheal aspirate unless there is genuine clinical suspicion for pneumonia (e.g., based on hypoxemia and chest radiograph abnormalities). 📖
      - What matters is the number of sets that are positive, not the number of bottles.One set of cultures = two bottles (aerobic & anaerobic). Contamination of a blood draw may cause both bottles within a single set to turn positive.
      - (A single blood culture showing yeast, or gram-negative bacilli generally does merit treatment).
      High-quality supportive care
      
      High-quality supportive care consists of basic, daily management needed for any critically ill patient to prevent or surmount common problems. This isn't particularly flashy or exciting. However, it's essential for every patient passing through the intensive care unit. Minor interventions, when leveraged across thousands of patients, can have a substantial impact.
      
      This chapter provides an overview of issues that commonly arise in the daily practice of critical care. The goal is to rapidly provide a basic foundation of knowledge, especially for folks who don't work full-time in the ICU (e.g., residents rotating through the unit). Links are provided to full chapters on these topics, to provide additional detail as needed.
      
      Medications to avoid in ICU
      
      benzodiazepines, diphenhydramine, zolpidem
      - These drugs used to be popular for treatment of insomnia or agitation. However, they promote delirium and should be avoided.
        
        These medications will temporarily calm agitated patients, thereby appearing to work. However, they ultimately make patients worse by exacerbating their underlying delirium.
        
        For insomnia: quetiapine, guanfacine.
        
        For acute agitation: haloperidol, olanzapine, dexmedetomidine.
        
        For sedation: dexmedetomidine, propofol, possibly quetiapine.
        
        Status epilepticus.
        
        Ketamine re-emergence, procedural sedation.
        
        Patients who are chronically on benzodiazepines as a home medication.
        
        Palliative sedation.
        
        Occasional cases of complicated alcohol withdrawal (phenobarbital has largely replaced this indication for benzodiazepines).📖
        
        nephrotoxins 📖
        
        The kidney is usually the first organ to be damaged by hypoperfusion. Kidney injury correlates strongly with increased mortality. The following medications should therefore be avoided whenever possible.
        
        NSAIDs should be avoided as a rule in the ICU (due to both nephrotoxicity and risk of GI bleeding). Treatment of pain in critically ill patients is explored further below. 📖 This does not involve NSAIDs. (11979336)
        
        ACE-inhibitors & angiotensin-receptor blockers (ARBs)
        
        ACEi/ARB generally shouldn't be initiated for control of blood pressure, except in select situations (e.g. chronic anuric renal failure, SCAPE 📖, or type-I myocardial infarction 📖). For patients on ACEi/ARB solely for hypertension, consider holding these.
        
        ACEi/ARB should often be continued for patients with heart failure and reduced ejection fraction who are already on these medications chronically.
        
        tramadol
        
        Tramadol is a weak opioid with a host of side effects (seizures, delirium, serotonin syndrome, hypoglycemia).
        
        The efficacy of tramadol is erratic, depending on genetic variation and interacting drugs. (23509136)
        
        Tramadol is sometimes promoted as a “non-opioid” but this isn't true. Tramadol is an opioid, it's just a really poor one.
        
        The only reason to consider using tramadol is if the patient is chronically on tramadol as a home medication. 🌊🌊
        
        fluoroquinolones
        
        Over-utilization of fluoroquinolone has caused marked increases in antibiotic resistance. (21996380, 21144988) Meanwhile, problems with C. difficile, MRSA, neuropathy, delirium, and tendinopathy have grown more apparent. 🌊 (17884829, 16477553, 16206099, 22921930, 25700059, 26330729, 25423877, 11793615) The FDA consequently issued a series of black box warnings on fluoroquinolones. 🌊
        
        Fluoroquinolones are almost never the best choice for critically ill patients. Previously, fluoroquinolones were frequently used for treatment of pneumonia in patients with penicillin allergy, but newer evidence has shown that 3rd-4th generation cephalosporins are generally fine for such patients. 📖 (21742459)
        
        aminoglycosides
        
        There is no convincing evidence that double-coverage for gram-negative pathogens is beneficial (even for ventilator-associated pneumonia or pseudomonal infections – situations where double-coverage would seem most beneficial). 🌊 (18091545, 9377880, 24395715, 22763634, 24139926, 23410791)
        
        A single broad-spectrum beta-lactam is generally adequate. Addition of an aminoglycoside provides little additional coverage, but does increase nephrotoxicity.
        
        DVT prophylaxis
        
        all patients should get DVT prophylaxis unless they have one of the following contraindications:
        
        (1) Hemorrhage.
        
        (2) Thrombocytopenia (platelet count
        (3) Planned procedure:
        
        DVT prophylaxis isn't a significant problem for most ICU procedures, with the exception of lumbar puncture.
        
        Interventional radiology may prefer to hold DVT prophylaxis; when in doubt this should be clarified with them in advance.
        
        DVT prophylaxis if GFR >30 ml/min
        
        Enoxaparin is the preferred agent for the following reasons:
        
        Fewer injections than s.q. unfractionated heparin, limiting patient discomfort.
        
        Reduced risk of HIT as compared to unfractionated heparin.
        
        Enoxaparin may be more effective. (23782973)
        
        Weight
        Weight >120 kg: increase dose to 0.25 mg/kg enoxaparin q12hr. (19272635, 24136071, 27714833)
        
        Consider this for patients with unusual weight, pregnancy, or borderline renal function.
        
        Check an anti-factor Xa level four hours after the third dose (target level ~0.3-0.5 IU/ml). 📖
        
        DVT prophylaxis if GFR
        
        Unfractionated heparin is used here, because it's not cleared by the kidneys.
        
        Usual dose: 5,000 IU s.q. TID.
        
        Weight-based dose adjustments:
        
        For patients weighing
        For patients weighing >120 kg, consider scaling the dose up roughly proportional to the patient's weight.
        
        GI prophylaxis
        
        non-pharmacologic measures
        
        Always avoid NSAIDs in ICU patients. (11979336)
        
        Enteral nutrition should be provided whenever possible. 📖
        
        indications for pharmacological GI prophylaxis
        
        [1] The patient is truly critically ill (e.g., not simply boarding in the ICU).
        
        -PLUS-
        
        [2] One of the following:
        
        Shock.
        
        Coagulopathy.
        
        Chronic liver disease.
        
        Neurocritical care patient (primarily in terms of elevated intracranial pressure).
        
        proton pump inhibitors (PPIs) are preferred for GI prophylaxis
        
        Pantoprazole 40 mg PO/IV daily is preferable for the following reasons:
        
        (1) Greater efficacy compared to H2-receptor blockers. (23318494, 15996033)
        
        (2) Possibly lower risk of delirium compared to H2-receptor blockers. (22949902, 11573854)
        
        (3) Prior fears about increased risk of C. difficile or pneumonia have been debunked by evidence from the SUP-ICU trial and the REVISE trial. 🌊🌊 (30354950)
        
        (Further discussion on GI prophylaxis here: 📖)
        
        Anemia & transfusion targets
        
        the ICU hemoglobin drift
        
        Most patients in ICU will experience a gradual decrease in hemoglobin, which is caused by several factors: (12576944)
        
        [1] Suppression of hematopoiesis by critical illness.
        
        [2] Phlebotomy from serial lab measurements.
        
        [3] Subclinical loss from the GI tract (minor stress ulceration).
        
        approach to falling hemoglobin
        
        Evaluation:
        
        Acutely falling hemoglobin can be caused only by bleeding or hemolysis (not reduced blood synthesis, which can cause only chronic anemia). Therefore, the investigation of acute anemia should focus on sources of blood loss and hemolysis.
        
        Investigation may include: Repeat CBC, LDH to exclude hemolysis, ultrasonography to look for hemoperitoneum/hemothorax, CT angiography.
        
        Conservative blood transfusion, if needed.
        
        Avoid lab draws as able.
        
        Treat any overt source of bleeding.
        
        For patients with persistently dropping hemoglobin without any explanation, consider empiric proton pump inhibitor for therapy of probable stress ulceration (e.g., 40 mg pantoprazole PO BID).
        
        conservative transfusion strategy 📖
        
        Hemodynamically stable patients with anemia should be treated with a conservative transfusion strategy. Blood transfusion causes numerous complications (e.g., volume overload, transfusion-related acute lung injury, transfusion reactions). Conservative transfusion practices improve outcomes – in some cases even mortality. (23281973)
        
        Blood transfusion should be given if the hemoglobin falls below a transfusion target: (28284299)
        
        For post-CABG patients and patients with active myocardial ischemia: transfuse if hemoglobin
        For everyone else (the vast majority of patients): transfuse if hemoglobin
        
        [1] Hemoglobin bounces around due to random variation in the laboratory. Overreacting to a low hemoglobin with two units of blood will often overcorrect the anemia.
        
        [2] Blood transfusion tends to cause pulmonary edema (more so than crystalloid). Two units of blood is a significant volume challenge for an ICU patient who will often have euvolemic or hypervolemic anemia.
        
        Glycemic control
        
        better sweet than sour
        
        Hypoglycemia may cause permanent brain damage and cardiopulmonary arrest. This is especially dangerous among intubated and sedated patients, who can develop severe hypoglycemia without any signs or symptoms (altered mental status will be masked by sedation).
        
        Hyperglycemia will not kill the patient. It's controversial to what extent hyperglycemia may be dangerous. Hyperglycemia undoubtedly correlates with poor outcomes, but it's unclear to what extent it causes harm.
        
        When in doubt, err on the side of avoiding hypoglycemia. Use insulin cautiously , paying attention to changes in steroid dosing and caloric intake (e.g., new NPO orders).
        
        ICU patients should receive occasional glucose checks to avoid occult hypoglycemia.
        
        glycemic targets
        
        It's unknown when we should treat hyperglycemia. Enormous energy is spent achieving various glycemic targets, but these targets are arbitrary. No RCT has shown that treatment of hyperglycemia in critically ill patients improves outcomes (except for the Leuven 2001 study, which was subsequently debunked by VICEP and NICE-SUGAR). (11794168, 18184958, 19318384)
        
        The most recent American College of Physicians guideline recommends a glucose target of 140-200 mg/dL (7.8-11.1 mM). (23709472) Other authors have suggested 140-220 mg/dL (7.8-12.2 mM). (23470218)
        
        Diabetic patients with chronic hyperglycemia may benefit from a greater degree of permissive hyperglycemia, because that's what they are used to. Among patients with hemoglobin A1C >7%, mild hyperglycemia may actually correlate with better outcomes. One pilot study demonstrated the safety of targeting a glucose level of 180-250 mg/dL (10-14 mM) among such patients. (27315191)
        
        Nutrition for the intubated patient
        
        most intubated patients should be fed 📖
        
        Benefits of enteral nutrition include:
        
        Maintains gut integrity, preventing bacterial translocation into bloodstream.
        
        Prevents development of ileus.
        
        Reduces stress ulceration.
        
        Prevents malnutrition.
        
        Avoids the development of starvation ketoacidosis.
        
        GI catastrophe (obstruction, perforation, mesenteric ischemia, major upper GI bleeding).
        
        Planned procedure that requires NPO.
        
        (Note: Pancreatitis is not a contraindication to enteral nutrition). 📖 (26773077, 29409760)
        
        route of feeding 📖
        
        Most intubated patients will initially have an orogastric (OG) tube placed. This can be used for feeding.
        
        A post-pyloric small-bore soft feeding tube may be subsequently placed, for one of the following reasons.
        
        [1] Post-pyloric feeding can be useful for patients with gastroparesis or vomiting (since it bypasses the stomach).
        
        [2] A smaller-bore nasal feeding tube is more comfortable and can be left in place longer (e.g., after the patient has been extubated). This may be useful in patients with hepatic encephalopathy or neurologic injury, in whom it is important to maintain gut access following extubation.
        
        initial nutrition orders 📖
        
        Start with a standard 1 kCal/ml tube feed (e.g. Replete). Target a goal rate of somewhat below ~1 ml/hr/kg. For example, a 77 kg patient would receive ~60 ml/hour. In morbid obesity use the ideal body weight.
        
        In severe renal failure, use a 2 kCal/ml renal tube feed (e.g. Novasource Renal) at a rate of 0.5 cc/kg/hour.
        
        The nutrition team will adjust your orders, but the most important aspect is to provide some enteral nutrition. The precise number of calories doesn't seem to have a huge impact – the key thing is providing a reasonable amount of nutrition. (30346225)
        
        gastric residual volume 📖
        
        Recent nutrition guidelines recommend against checking gastric residual volume. (26773077, 19861528, 23321763)
        
        Tube feeds shouldn't be held based on elevated gastric residual volumes. Feeding may be continued unless there are clinical signs of feeding intolerance (e.g. abdominal distension/discomfort, emesis).
        
        Analgesia & pain management
        
        The best approach to pain is a structured, multi-modal strategy which uses several medications at low doses. Using lower doses avoids toxicity from each medication, while the use of several medications provides synergistic efficacy. 📖
        
        #1 acetaminophen 📖
        
        Useful agent, either as an adjunct or the sole therapy for minor pain. (20189753)
        
        Most patients can receive up to 4 grams/day. It's often useful to schedule this (e.g., 1 gram q6hr) to keep ahead of pain.
        
        Patients with alcoholism or chronic liver disease can receive up to 2 grams/day. (25477978)
        
        Acetaminophen is contraindicated in acute hepatic injury.
        
        #2 PRN opioids 📖
        
        Often used as second line therapy, mostly due to convenience.
        
        IV fentanyl works rapidly and is often utilized.
        
        IV hydromorphone may be useful if patients are requiring frequent fentanyl doses. Hydromorphone requires less frequent dosing, since it has a longer half-life. Note that hydromorphone is much more potent than morphine, so relatively low doses should be given (e.g., 0.2-0.4 mg IV).
        
        Oral opioids may be preferable for more stable patients with moderate pain who are able to take oral medications.
        
        #3 ketamine infusion +/- clonidine/dexmedetomidine
        
        Ketamine provides a mild-moderate amount of analgesia. 📖 Ketamine has been shown to reduce opioid requirements and decrease the incidence of nausea/vomiting. (12933413, 26025196, 28468568) Ketamine may also attenuate the development of opioid tolerance and opioid-induced hyperalgesia, thereby making co-administered opioids safer and more effective. (23269131, 14581110, 15983467, 16854557)
        
        Ketamine is extraordinarily safe. Although sometimes feared due to its classification as an “anesthetic” agent, ketamine is actually the safest medication listed here (especially at the extremely low doses used to treat pain). (25530168, 10499950)
        
        The dose for a ketamine infusion to treat pain typically 0.1-0.3 mg/kg/hr. At the higher end of this dose range, some patients may experience mild psychotropic side-effects which are often pleasurable (but can be scary). If psychomimetic side-effects occur, stop the infusion for 30-60 minutes and re-start at a lower dose. It's generally possible to find a sweet spot where pain relief is achieved without side-effects.
        
        Alpha-2 agonists (dexmedetomidine, clonidine, or guanfacine) may synergize with ketamine to improve analgesia. 📖 (23711600, 20648205, 19095506) Alpha-2 agonists also prevent psychomimetic side-effects of ketamine, thereby further enhancing the safety of ketamine. (29870458, 19783371, 9507131, 27656531, 10773503, 26919405)
        
        #4 fentanyl infusion
        
        Fentanyl infusions should be avoided whenever possible , for many reasons. Over several days patients will rapidly become tolerant to opioid, which may subsequently cause withdrawal when fentanyl is discontinued. (22420584) Fentanyl accumulates in adipose tissue, causing the drug to linger after the infusion is stopped, leading to delayed awakening. 🌊 (26346209)
        
        A 25 mcg/hr fentanyl infusion is equivalent to 120 mg oxycodone per day. Unless the patient has some extraordinary source of pain, 25-50 mcg/hr of fentanyl should be sufficient. High-dose fentanyl infusions can actually exacerbate pain, a phenomenon known as opioid-induced hyperalgesia. (26095487)
        
        If a fentanyl infusion is used, attempts should be made on a regular basis to reduce the dose (at a minimum, every morning).
        
        make sure you're targeting pain
        
        Analgesics shouldn't be used as nonspecific “calm down” medication for any agitated patient. Ideally, they should be targeted specifically at pain.
        
        For patients unable to communicate, a behavioral pain scale can help determine whether the patient is in pain.
        
        Sedation of the intubated patient
        
        Intubated patients will generally require a sedative infusion. Propofol or dexmedetomidine are front-line choices, without any solid evidence that one is superior to the other. In practice, propofol is generally used initially. Dexmedetomidine is often useful once the patient is within a few days of extubation.
        
        propofol 📖
        
        Easily & rapidly titrated.
        
        May cause hypotension, but this can be counteracted with an infusion of low-dose norepinephrine (e.g. ~0-8 mcg/min).
        
        Use of high propofol doses for prolonged periods of time may cause hypertriglyceridemia and a risk of propofol infusion syndrome. Over extended periods of time, it's ideal to wean the dose down to
        
        dexmedetomidine
        
        The major advantage of dexmedetomidine is that it doesn't suppress respiration, making it safe to use in a non-intubated patient. Therefore, dexmedetomidine may be continued throughout the weaning process (unlike propofol, which must be shut off prior to extubation). This is an excellent option for patients who develop anxiety and tachypnea whenever sedation is lifted, making it difficult to extubate them. (26975647)
        
        Dexmedetomidine may cause hypotension due to bradycardia, but this can be counteracted with an infusion of low-dose epinephrine if the use of dexmedetomidine is critical.
        
        Boluses of dexmedetomidine should be avoided , as these can cause bradycardia in hemodynamic instability. Instead, the infusion can be started at a relatively high rate (e.g. 1-1.4 mcg/kg/min) without a bolus, and then down-titrated within 30-60 minutes.
        
        sedating atypical antipsychotics
        
        Quetiapine has sedating effects and efficacy in anxiety disorders. (29110139) Quetiapine may be useful for its sedative properties, in order to allow a reduction in the dose of propofol or dexmedetomidine that is required. 📖 (19915454)
        
        benzodiazepines
        
        Benzodiazepines are the sedative of last resort. They should be avoided whenever possible.📖
        
        Benzodiazepines may occasionally be needed for patients with profound hemodynamic instability, in whom propofol or dexmedetomidine are contraindicated.
        
        Delirium prevention
        
        Delirium is extremely common in the ICU (prevalence of ~50%). This makes it worthwhile to deploy preventative measures broadly.
        
        general delirium prevention measures 📖
        
        Ear plugs and eye shades at night, if tolerated. (26741578)
        
        Avoid unnecessary sleep interruption (e.g., frequent blood pressure cuff monitoring, neuro checks).
        
        Use of glasses & hearing aids during the day.
        
        Aggressive physical therapy and early mobilization.
        
        insomnia treatment strategy
        
        Quetiapine 25-50 mg is often effective, but ideally should be given early in the night (to prevent somnolence the following day and day/night reversal). 📖
        
        Dexmedetomidine infusion is an excellent option for insomnia and nocturnal agitation. (29498534) The main limitations are logistic (this is an expensive intervention which cannot be used on the general ward).
        
        If dexmedetomidine is used for insomnia or nocturnal agitation, it should be discontinued or aggressively down-titrated the following morning. Reserving dexmedetomidine for nocturnal use may promote preservation of a normal circadian rhythm.
        
        Oral clonidine (0.2-0.3 mg QHS) or guanfacine (2 mg QHS) may be considered as an alternative to dexmedetomidine for mild insomnia.
        
        Volume status & diuresis
        
        avoid volume overload
        
        Critically ill patients will generally tend to retain fluid and become volume overloaded. Without attention to volume status, this may lead to profound volume overload. Numerous studies correlate positive fluid balance with mortality. (26073560, 28130687)
        
        Follow your patient's volume status carefully. If the patient is consistently gaining fluid or becoming >4-5 liters net positive, this is a problem which requires active management.
        
        ⚠️ Allowing patients to develop highly positive fluid balance (e.g., >4-6 liters positive) is a hallmark of poor-quality critical care.
        
        Exception: For healthy patients with normally functioning kidneys and heart (e.g., young intoxicated patients), maintenance fluids are reasonable because such patients don't tend to retain fluid. However, you should still follow input/output to ensure that the patient isn't retaining fluid.
        
        don't blindly chase low urine output or elevated lactate with fluid
        
        It is quite uncommon for patients in the ICU to be truly volume depleted:
        
        Most patients will be adequately fluid resuscitated in the emergency department.
        
        Patients will usually retain fluid, so they will generally tend to develop fluid overload.
        
        if you're going to give fluid, LR is generally superior to normal saline
        
        LR is generally the fluid of choice in the ICU with the following two exceptions:
        
        [1] Patients with elevated intracranial pressure (normal saline may be preferable).
        
        [2] Patients with metformin-induced lactic acidosis (optimal fluid in this situation is hotly debated, but it's not LR 📖).
        
        The use of normal saline should generally be restricted to patients with metabolic alkalosis or elevated intracranial pressure. 🌊
        
        balanced diuresis 📖
        
        It's not uncommon to encounter patients who are 5-10 liters positive, often due to over-resuscitation at an outside hospital. These patients will benefit from aggressive diuresis if tolerated.
        
        Use of furosemide alone tends to cause excretion of dilute urine, causing hypernatremia. This hypernatremia must then be treated by administration of free water, so the net result is ineffective diuresis.
        
        Addition of a thiazide diuretic (e.g. indapamide 5 mg PO daily) will enhance renal excretion of sodium, facilitating effective diuresis without the development of hypernatremia. (26948252) 📖
        
        If contraction alkalosis is developing and the patient remains hypervolemic, IV acetazolamide may be needed to prevent worsening alkalosis. For patients who are undergoing active diuresis, a reasonable dose is 500-1000 mg IV q12 hr. (26836730)
        
        Follow electrolytes, with aggressive repletion of potassium and magnesium as needed.
        
        Electrolyte management
        
        hypernatremia 📖
        
        Hypernatremia should never be tolerated , because this will cause the patient to be miserable (they will be profoundly thirsty yet unable to drink).
        
        Untreated hypernatremia is an under-recognized and under-treated cause of agitation among intubated patients. Too often it's treated with sedatives, rather than water.
        
        Don't just arbitrarily give some random amount of water – calculate exactly how much water is required to achieve the desired drop in serum sodium.
        
        For patients with chronic hypernatremia (stable elevation >48hr), target reducing the sodium by 12 mM per day. Don't worry about overshooting this a bit unless your patient is
        
        Furosemide plus high-dose thiazide may be used to promote sodium excretion (natriuresis; discussed in the section above).
        
        Free water administration is provided to treat hypernatremia.
        
        Follow electrolytes, with aggressive repletion of potassium & magnesium. Follow input/output balance and target a negative fluid balance.
        
        hyponatremia 📖
        
        Mild subacute or chronic hyponatremia is common in critical illness (e.g. sodium ranging 125-135 mEq/L). This doesn't require aggressive management or evaluation.
        
        hyperkalemia 📖
        
        Traditional treatment with kayexalate is ineffective and shouldn't be utilized. The most effective treatment for hyperkalemia is usually kaliuresis: stimulation of potassium excretion by the kidneys using a combination of diuretics and fluids. However, patients with end-stage renal disease on chronic dialysis will simply need to be dialyzed.
        
        Diuretic:
        
        Mild hyperkalemia: Furosemide alone may be fine.
        
        Severe hyperkalemia: A more aggressive diuretic regimen may be indicated, especially for patients with severe hyperkalemia who will require urgent dialysis if they don't respond. A maximally aggressive diuretic combination is the nephron bomb which consists of ~200 mg IV furosemide, 500-1000 mg IV chlorothiazide, and 500-1000 mg IV acetazolamide.
        
        The goal here is to bring the patient to a point of euvolemia and keep them there. Patients who produce copious amounts of urine in response to diuresis should have this fluid volume replaced.
        
        For patients with significant metabolic acidosis (serum bicarbonate
        For patients without metabolic acidosis, the preferred fluid is lactated ringers.
        
        Normal saline is contraindicated in hyperkalemia, because it will worsen it. (15845718, 18569935, 22237237, 29121282)
        
        hypokalemia 📖
        
        Hypokalemia isn't as dangerous as commonly perceived (mild hypokalemia is generally well tolerated in the absence of digoxin use or hypomagnesemia).
        
        When possible, potassium should be administered via the gut. Administration of enteral potassium is easier, cheaper, and safer than IV potassium.
        
        Check the magnesium level and replete if necessary. Hypokalemia and hypomagnesemia often coexist. Hypomagnesemia will cause ongoing potassium wasting, so successful repletion of potassium may depend on fixing the magnesium as well.
        
        Be very cautious about treating hypokalemia in patients with severe renal failure:
        
        The target potassium might be around 3-3.5 mEq/L in this scenario (don't shoot for a stone-cold “normal” potassium level; the potassium level will rise over time).
        
        Check and replete the magnesium level (target >2 mg/dL), as this will protect against Torsade de pointes and increase the safety margin for mild hypokalemia.
        
        Discontinue PRN potassium orders.
        
        hypomagnesemia 📖
        
        Common in critically ill patients.
        
        Should generally be treated with IV magnesium sulfate (oral magnesium causes diarrhea and is ineffective at improving serum magnesium levels). However, oral magnesium oxide can be great for patients who have mild hypomagnesemia and constipation (a fairly common combination).
        
        Patients with total body magnesium depletion (e.g., alcoholics) may require ongoing therapy to achieve eumagnesemia.
        
        hypocalcemia 📖
        
        Critically ill patients are very commonly hypocalcemic. This is an epiphenomenon of critical illness, that doesn't seem to actually cause harm (with certain exceptions, most notably massive transfusion).
        
        Treatment of mild hypocalcemia is generally ineffective and might actually be harmful. (26836894)
        
        Unless the calcium is very low (e.g., ionized calcium < 0.7 mM) and/or the patient seems to be demonstrating symptoms of hypocalcemia, it's generally best not to administer calcium.
        
        Overall, it's probably best not to check calcium levels, with the exception of admission labs or a specific reason to expect hypocalcemia (e.g., massive transfusion protocol).
        
        MI & ischemia evaluation in the non-cardiac patient
        
        This section describes the approach to troponin elevation in the “non-cardiac” patient – that is, a patient admitted to the ICU for a non-cardiac problem (e.g., septic shock, DKA, respiratory failure, etc.).
        
        do not check troponin routinely in all ICU patients
        
        About ~40% of ICU patients will have troponin elevation, but the vast majority of these patients are not having a plaque-rupture (type-I) MI. (28979516)
        
        ECGs should be routinely obtained on all ICU patients (if nothing else, this serves as a baseline for comparison throughout the patient's hospital stay).
        
        Troponin should be checked only if there is a genuine clinical suspicion for myocardial infarction based on the EKG and clinical presentation.
        
        sorting out three categories of troponin elevation 📖
        
        Unfortunately, troponin levels are often obtained when they aren't actually indicated. When this occurs, we need to sort out what is causing the troponin elevation.
        
        A key concept here is the universal definition of a myocardial infarction , which requires both of the following two features: (30571511)
        
        [1] Dynamic rise/fall in troponin levels
        
        [2] At least one of the following:
        
        Clinical history suggests MI (e.g., anginal chest pain).
        
        New ischemic EKG changes.
        
        New wall motion abnormality on echocardiography.
        
        These patients have troponin elevation without other features of MI (they don't meet the definition of MI above).
        
        This is extremely common among critically ill patients and requires no treatment.
        
        There is no therapeutic benefit to ongoing cycling of the troponin in this situation.
        
        There is no need to treat this (the patient doesn't have a MI).
        
        These patients have classic MI due to plaque rupture and acute coronary thrombosis. Most patients with type-I MI will initially present to the hospital with cardiac-related signs or symptoms. Type-I MI can arise as a complication of critical illness, but this is uncommon.
        
        Type-I MI should be treated with the typical treatment regimen generally associated with MI if possible (e.g., aspirin, P2Y12 inhibitor, possibly cardiac catheterization). However, the ability to provide such treatments is often limited by bleeding, hypotension, and acute kidney injury.
        
        These patients have MI due to a fixed coronary lesion plus physiologic stress (figure above).
        
        Sorting out type-I vs. type-II MI can be tricky (the table below may help guide this). When in doubt, urgent echocardiography can be helpful.
        
        The treatment for type-II MI focuses on treatment of the underlying disease (e.g. anemia, sepsis, hypoxemia). Aspirin is reasonable, but otherwise these patients don't require specific treatment directed towards plaque stabilization.
        
        use a heparin infusion only if truly indicated
        
        Troponin elevations are scary and we may feel compelled to do something. However, initiating a heparin infusion is rarely wise here. Heparin is indicated only if both of the following two conditions are met: 🌊
        
        [1] The patient has a type-I (plaque-rupture) MI. This can occur in patients who present with non-cardiac diagnoses, but it's uncommon.
        
        [2] There is a plan to take the patient for urgent/emergent cardiac catheterization.
        
        The traditional practice of using a 48-hour heparin infusion for “medical management” of MI without PCI is not evidence-based. (8006281, 1976875, 8596317) The only clear role for a heparin infusion is to stabilize plaque as a bridge to cardiac catheterization.
        
        Noninvasive respiratory support (HFNC & BiPAP)
        
        when to choose BiPAP 📖
        
        Contraindications to BiPAP:
        
        Secretions (BiPAP generally impairs expectoration).
        
        Aspiration risk, altered mental status.
        
        COPD, Asthma.
        
        Cardiogenic pulmonary edema.
        
        Obesity hypoventilation syndrome.
        
        Generally worth trying for patients with COPD/asthma or heart failure who have difficulty tolerating BiPAP.
        
        Dexmedetomidine is ideal, given its titratability and lack of respiratory suppression.
        
        Avoid benzodiazepines (they occasionally work, but often cause patients to be agitated/confused thereby worsening the situation).
        
        Some options may include: haloperidol, carefully titrated fentanyl for patients with severe air hunger.
        
        how to titrate BiPAP
        
        Simply sticking the patient on BiPAP isn't enough – you need to titrate settings to obtain optimal benefit. The FiO2 may simply be titrated against the patient's oxygen saturation. The tricky part is adjusting the inspiratory and expiratory pressures.
        
        Cardiogenic pulmonary edema
        
        Key here is the expiratory pressure (this increases the mean airway pressure and thereby decreases preload & afterload).
        
        Ramp up expiratory pressure until the patient improves (e.g. 10/5 ==> 15/10 ==> 18/15), It’s also fine to simply use continuous positive airway pressure (CPAP). In that case, escalate CPAP pressure from 5 ==> 10 ==> 15 cm.
        
        The key here is driving p ressure (inspiratory pressure minus expiratory pressure), which supports the work of breathing.
        
        Ramp up the driving pressure until the patient improves (e.g. 10/5 ==> 15/5 ==> 18/5).
        
        when to choose HFNC
        
        Any patient with significant respiratory distress who doesn't have specific indications for BiPAP (above).
        
        The most common indication is pneumonia. (25981908)
        
        how to titrate HFNC
        
        FiO2 is titrated against the patient's oxygen saturation.
        
        Initially when the patient is in distress, flow rate should be increased as high as tolerated, usually 50-60 liters/minute (this provides the maximal amount of ventilatory and PEEP support).
        
        After the patient is improving, flow rate can be weaned down. If there are signs of tachypnea or dyspnea, this may indicate that the patient isn't ready for weaning.
        
        post-extubation prophylactic HFNC 📖
        
        Extubation directly to HFNC has been shown to reduce the risk of reintubation, even in patients who are low risk for reintubation. (25003980, 26975498)
        
        With the exception of patients intubated very briefly for procedures, post-extubation HFNC is usually worthwhile.
        
        For maximal benefit, HFNC should be increased to the highest flow rate tolerated (ideally 50-60 liters/min) and continued for ~24 hours.
        
        The mechanism of action seems to be that HFNC reduces the work of breathing, thereby preventing patients from developing respiratory fatigue. In order for this to be effective, it should be started promptly following extubation (not in a delayed fashion after patients develop severe dyspnea).
        
        Respiratory monitoring (including ABG, VBG and etCO2)
        
        oxygenation
        
        The best way to monitor oxygenation is pulse oximetry. Pulse oximetry is preferred over ABG monitoring because pulse oximetry directly measures oxygen saturation (whereas portable ABG meters calculate oxygen saturation). 🌊
        
        Oxygen saturation (not pO2) is the most important variable because this most directly measures oxygen delivery to the body's tissues.
        
        Excessive amounts of oxygen (hyperoxia) can be dangerous, especially following cardiac arrest.
        
        If an unnecessarily high amount of oxygen is used, this will mask early clinical deterioration (the patient will need to worsen a lot before they desaturate).
        
        ventilation: what are we targeting ??
        
        Honestly, nobody really knows. This implies that we shouldn't be dogmatic or obsessive about adjusting/monitoring ventilation.
        
        Upper safe limit for pCO2?
        
        Hypercapnia is generally tolerated extremely well (for example, there are COPD patients living in the comm unity right now with a pCO2 >80 mm).
        
        Permissive hypercapnia refers to the concept that allowing some hypercapnia is fine. Among patients with COPD/asthma or ARDS, some hypercapnia is preferred because this facilitates lung-pro tective mechanical ventilation.
        
        The lower limit of pH below which hypercapnia becomes harmful is unknown. pH >7.2 is definitely fine, and pH >7.1 is probably fine as long as hemodynamically tolerated. There doesn't appear to be any specific pH cutoff below which the patient will turn into a pumpkin.
        
        Respiratory alkalosis (hypocapnia) may be less well tolerated than hypercapnia. There is a potential risk of seizure at pH >7.5
        
        The target range of pCO2 will depend on the bicarbonate (using the Henderson-Hasselbalch equation). 🧮
        
        For example, for a patient with bicarbonate of 24, a safe pCO2 would be 30-65 mm.
        
        when to check ABG/VBG?
        
        Overall these are checked far too often, with the vast majority of results having minimal/no effect on clinical management. 🌊
        
        ABG/VBG values generally provide no diagnostic information regarding why a patient is in respiratory failure (with the exception of hyperventilation due to anxiety). (21663600) Checking a blood gas for a patient in respiratory distress of unknown cause is unlikely to yield a diagnosis (whereas tests such as chest radiograph and lung ultrasound are far more likely to help).
        
        ABG/VBG occasionally can reveal the presence of hypercapnic encephalopathy in a somnolent patient with no obvious respiratory compromise. Such patients generally have a history of chronic hypercapnia (e.g., severe COPD or obesity hypoventilation syndrome).
        
        ABG/VBG can be helpful to monitor ventilation, especially among patients who are intubated or on BiPAP/HFNC. However, this is only one piece of information that should be carefully integrated with the overall clinical picture.
        
        VBG vs. ABG?
        
        For most patients oxygenation can be measured with pulse oximetry. Therefore, the only information we get from VBG/ABG is the pH and pCO2. If we already know the patient's bicarbonate from serum chemistries, then VBG/ABG provides only one independent piece of information (because the pCO2 will determine the pH based on the Henderson-Hasselbach equation).
        
        VBG values are extremely close to ABG values as long as the oxygen saturation from the venous blood gas isn't extremely low (VBG oxygen saturation >75%). 🌊
        
        Most patients have a peripheral vein cannula that allows blood removal. A small amount of blood can be removed, allowing for painless and accurate monitoring of blood gas parameters. If venous blood is obtained without a tourniquet and analyzed immediately, it will generally have a saturation >75%, yielding accurate information.
        
        VBG pCO2 > ABG pCO2.
        
        VBG pH < ABG pH.
        
        end tidal CO2 (etCO2) 📖
        
        For intubated patients, etCO2 can be used to estimate and trend the patient's arterial pCO2.
        
        etCO2 will always underestimate blood pCO2, because gas in the trachea dilutes CO2 as it travels from the alveoli to the ventilator.
        
        If the etCO2 is >45 mm, then the patient is definitely hypercapneic.
        
        In healthy lungs, this gap is usually
        In patients with lung disease (e.g., COPD, pneumonia, ARDS, PE, pulmonary contusion) the gap will widen.
        
        One exception would be in patients with severe metabolic acidosis, in whom the respiratory rate should initially be maximized in efforts to provide a compensatory respiratory alkalosis.
        
        minute ventilation
        
        Minute ventilation is the volume of gas moving in/out of the lungs every minute. A normal minute ventilation is ~6-7 liters/min.
        
        Patients with ineffective ventilation (ventilation/perfusion mismatch, for example, due to COPD or ARDS) will need a higher minute ventilation to achieve a normal pCO2 level (e.g. 10-14 liters/minute).
        
        Minute ventilation is displayed on the screen of the ventilator or BiPAP machine. For patients on BiPAP, minute ventilation is accurate only in the absence of an air leak around the mask.
        
        Paying attention to minute ventilation can be extremely helpful , especially for patients on BiPAP. For example:
        
        A COPD patient with minute ventilation of >9 liters/min: this patient is probably ventilating OK.
        
        A COPD patient with minute ventilation
        
        Approach to fever in the ICU
        
        common causes 📖
        
        Infection: (~50% of cases)
        
        Pneumonia.
        
        C. difficile, Acalculous cholecystitis.
        
        Line infection.
        
        Surgical site infection.
        
        Procedure-related (hemodialysis, bronchoscopy, 1-3 days post-surgery).
        
        Drug fever.
        
        Febrile transfusion reaction.
        
        Sterile inflammation (pancreatitis, aspiration pneumonitis, ARDS).
        
        Pulmonary embolism.
        
        Alcohol withdrawal.
        
        Central fever (intracranial hemorrhage).
        
        workup
        
        Physical examination, focusing on:
        
        Sites of any intravascular catheter or surgical incision.
        
        Abdomen (distension or tenderness)?
        
        Sputum quality and volume.
        
        At least two sets of cultures from different venipuncture sites, with at least one peripheral culture.
        
        Any line in place >48 hours should be cultured.
        
        test to usually avoid
        
        Urinalysis & culture from foley catheter: In the absence of urinary obstruction or recent urinary tract manipulation, cystitis is rarely the cause of new-onset fever. Routinely culturing urine in all febrile ICU patients will tend to cause false-positive diagnoses of urinary tract infection. 📖
        
        Tracheal aspirate cultures: These will generally be positive due to colonization in anyone with COPD, cystic fibrosis, or prolo nged intubation. Obtain sputum cultures only if there is a genuine clinical suspicion for pneumonia (e.g., based on increased sputum production, hypoxemia, or chest radiograph infiltrates).📖
        
        avoid antipyretics (acetaminophen) solely for the management of fever
        
        It's generally best to avoid using antipyretics with the intention of treating fever (as these will obscure the true fever curve).
        
        Indications for antipyretics may include:
        
        Neurologic injury (e.g., stroke, anoxic brain injury).
        
        Severe fever (e.g. >40C/104F).
        
        Fever appears to cause clinical deterioration (fever can cause some patients to become delirious or tachycardic).
        
        Scheduled acetaminophen for management of pain.
        
        avoid empiric antibiotics
        
        Fever isn't an indication for antibiotics.
        
        Antibiotics are only indicated in specific situations:
        
        [1] Neutropenic fever (absolute neutrophil count
        [2] Known or suspected septic shock (evidence of infection plus shock).
        
        [3] High index of suspicion for a specific focal infection (e.g. C. difficile, or suspected ventilator-associated pneumonia). In this situation, empiric antibiotics should be directed at this source (while awaiting test results).
        
        Questions & discussion
        
        To keep this page small and fast, questions & discussion about this post can be found on another page here.
        
        Guide to emoji hyperlinks
        
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Guide to supportive care in critical illness

CONTENTS

supportive care in ICU, extremely brief version

DVT prophylaxis 📖

GI prophylaxis 📖

Medications to avoid in ICU 📖

Anemia 📖

Glycemic control 📖

Volume status & hypotension 📖

Hypernatremia 📖

Hypokalemia 📖

Hypocalcemia 📖

Troponin & ischemic eval 📖

Fever & blood cultures 📖

High-quality supportive care

Medications to avoid in ICU

benzodiazepines, diphenhydramine, zolpidem

nephrotoxins 📖

tramadol

fluoroquinolones

aminoglycosides

DVT prophylaxis

all patients should get DVT prophylaxis unless they have one of the following contraindications:

DVT prophylaxis if GFR >30 ml/min

DVT prophylaxis if GFR

GI prophylaxis

non-pharmacologic measures

indications for pharmacological GI prophylaxis

proton pump inhibitors (PPIs) are preferred for GI prophylaxis

Anemia & transfusion targets

the ICU hemoglobin drift

approach to falling hemoglobin

conservative transfusion strategy 📖

Glycemic control

better sweet than sour

glycemic targets

Nutrition for the intubated patient

most intubated patients should be fed 📖

route of feeding 📖

initial nutrition orders 📖

gastric residual volume 📖

Analgesia & pain management

#1 acetaminophen 📖

#2 PRN opioids 📖

#3 ketamine infusion +/- clonidine/dexmedetomidine

#4 fentanyl infusion

make sure you're targeting pain

Sedation of the intubated patient

propofol 📖

dexmedetomidine

sedating atypical antipsychotics

benzodiazepines

Delirium prevention

general delirium prevention measures 📖

insomnia treatment strategy

Volume status & diuresis

avoid volume overload

don't blindly chase low urine output or elevated lactate with fluid

if you're going to give fluid, LR is generally superior to normal saline

balanced diuresis 📖

Electrolyte management

hypernatremia 📖

hyponatremia 📖

hyperkalemia 📖

hypokalemia 📖

hypomagnesemia 📖

hypocalcemia 📖

MI & ischemia evaluation in the non-cardiac patient

do not check troponin routinely in all ICU patients

sorting out three categories of troponin elevation 📖

use a heparin infusion only if truly indicated

Noninvasive respiratory support (HFNC & BiPAP)

when to choose BiPAP 📖

how to titrate BiPAP

when to choose HFNC

how to titrate HFNC

post-extubation prophylactic HFNC 📖

Respiratory monitoring (including ABG, VBG and etCO2)

oxygenation

ventilation: what are we targeting ??