Vasopressor Management in ICU Patients

Primary Vasopressors and Their Mechanisms

Norepinephrine is the first-choice vasopressor for managing hypotension in ICU patients with vasodilatory shock, typically starting at 0.01-0.5 μg/kg/min and titrating to maintain a MAP of 65 mmHg, as recommended by the American College of Critical Care Medicine 1, 2
Vasopressin is often used as a second-line agent in combination with norepinephrine, particularly useful in septic or liver patients with relative vasopressin deficiency, according to the American Heart Association 2, 3

The standard target MAP is 65 mmHg for most ICU patients with shock, as suggested by the Society of Critical Care Medicine 1, 2
In patients with chronic hypertension, a higher MAP target (75-85 mmHg) may be beneficial to reduce acute kidney injury, as recommended by the American College of Cardiology 2
In elderly patients (>75 years), a lower MAP target (60-65 mmHg) may be appropriate, according to the American Geriatrics Society 2

In pulmonary arterial hypertension (PAH), maintaining systemic vascular resistance (SVR) greater than pulmonary vascular resistance (PVR) is crucial, as stated by the American Thoracic Society 3
Inotropes with neutral or beneficial effects on PVR include dobutamine, milrinone, and epinephrine, as recommended by the American College of Chest Physicians 3

Peri-intubation hypotension is associated with increased ICU mortality, and bolus doses of phenylephrine (50-200 μg) or ephedrine (5-25 mg) can be used, as suggested by the American Society of Anesthesiologists 4, 5

Ensure adequate fluid resuscitation before or concurrent with vasopressor initiation, as recommended by the Society of Critical Care Medicine 1
Establish an appropriate MAP target (typically 65 mmHg) and monitor for adverse effects, as suggested by the American College of Critical Care Medicine 2

Relying solely on MAP without assessing other indicators of tissue perfusion can lead to complications, as warned by the American College of Cardiology 2
Targeting excessively high MAP (85 mmHg) can increase the risk of arrhythmias, as cautioned by the American Heart Association 2