Management of Refractory Hypotension with Epinephrine

Initial Management and Threshold for Adding Epinephrine

The American College of Cardiology recommends adding epinephrine infusion when norepinephrine reaches 0.25 mcg/kg/min and hypotension persists despite adequate fluid resuscitation, defined as a minimum of 30 mL/kg crystalloid bolus 1
Adequate fluid resuscitation should be ensured before escalating to epinephrine, with administration of at least 30 mL/kg crystalloid bolus before or concurrent with vasopressor initiation 1, 2
Norepinephrine optimization involves starting at 0.1-0.5 mcg/kg/min and titrating to achieve mean arterial pressure (MAP) ≥65 mmHg 1, 2
Central venous access is strongly preferred to minimize extravasation risk and tissue necrosis 1, 2

Epinephrine should be prioritized in cases of low cardiac output shock, where there is evidence of inadequate cardiac contractility, as indicated by echocardiogram or clinical assessment 3, 4
In pediatric septic shock, epinephrine is a more appropriate choice than in adults due to the predominantly low cardiac output state in children 3, 4
Epinephrine is also preferred in cases of persistent hypoperfusion despite adequate MAP, as evidenced by abnormal tissue perfusion markers such as lactate >2 mmol/L, urine output <0.5 mL/kg/h, or altered mental status 1

The recommended starting dose of epinephrine is 0.05-0.1 mcg/kg/min, with titration in increments of 0.03-0.05 mcg/kg/min every 10-15 minutes based on hemodynamic response 3, 4, 1
The maximum dose of epinephrine is 0.3 mcg/kg/min for most patients, though higher doses up to 0.5 mcg/kg/min may be necessary in refractory cases 3, 4, 1
Epinephrine should be administered via central venous catheter when possible, with peripheral IV or intraosseous access acceptable in emergencies while obtaining central access 3, 4, 1

Hemodynamic parameters such as blood pressure and heart rate should be monitored every 5-15 minutes during initial titration 1
Tissue perfusion markers, including lactate clearance, urine output, mental status, capillary refill, and skin temperature, should be assessed regularly 1
Cardiac function should be evaluated using echocardiography to assess contractility and guide inotropic therapy 3, 4
Adverse effects such as excessive tachycardia, arrhythmias, myocardial ischemia, and hyperglycemia should be watched for closely 3, 4