Vasopressor Management in Shock

Initial Management

The American College of Critical Care Medicine recommends norepinephrine as the first-line vasopressor for distributive shock, targeting a mean arterial pressure (MAP) of 65 mmHg after adequate fluid resuscitation 1
The initial management algorithm involves starting norepinephrine as the first-choice vasopressor via central venous access with continuous arterial blood pressure monitoring 1
A target MAP of 65 mmHg is recommended in most patients, though higher targets (80-85 mmHg) may be considered in patients with chronic hypertension 3
Administering at least 30 mL/kg IV crystalloid within the first 3 hours before or alongside vasopressor therapy is recommended 3

Adding vasopressin at 0.01-0.03 units/minute (maximum 0.03-0.04 units/minute) to raise MAP or decrease norepinephrine requirements is recommended if target MAP is not achieved with norepinephrine alone 1
Vasopressin should never be used as a single initial vasopressor 1
Adding epinephrine as an alternative second agent when additional support is needed is recommended 1
Considering dobutamine if persistent hypoperfusion exists despite adequate fluid loading and vasopressors, particularly with evidence of myocardial depression, is recommended 4

Dopamine should only be used in highly selected patients with low risk of tachyarrhythmias or with absolute/relative bradycardia, as it is associated with higher mortality, more arrhythmias, and worse outcomes compared to norepinephrine 1
Phenylephrine is not recommended except when norepinephrine causes serious arrhythmias, cardiac output is known to be high with persistently low blood pressure, or as salvage therapy when other agents have failed 1

Addressing the underlying obstruction first is the definitive treatment for obstructive shock 4
Norepinephrine is recommended if persistent hypotension with tachycardia exists in obstructive shock 4
Considering inotropes (dobutamine, dopamine, or phosphodiesterase III inhibitors) as first-line agents in acute heart failure-related cardiogenic shock is recommended 4
Dopamine may be considered specifically in patients with bradycardia 4
Phenylephrine or vasopressin should be used in afterload-dependent states such as aortic stenosis or mitral stenosis 4

Continuous arterial blood pressure monitoring is essential for all patients on vasopressors 2
Cardiac output monitoring should be considered, especially when using pure vasopressors like vasopressin 3
Serial assessment of lactate clearance, urine output, mental status, and skin perfusion to complement hemodynamic targets is recommended 1, 4