In advanced cardiac life support, what is the maximum cumulative dose of intravenous epinephrine that should be administered during a single resuscitation attempt?

Explanation

## Epinephrine Dosing in ACLS — No Maximum Cumulative Limit **Key Point:** Current ACLS guidelines do NOT specify a maximum cumulative dose of epinephrine during resuscitation. Epinephrine is administered repeatedly every 3–5 minutes (after the first dose) until return of spontaneous circulation (ROSC) is achieved or resuscitation is terminated. ### Epinephrine Dosing Regimen | Parameter | Value | |-----------|-------| | **Initial IV/IO dose** | 1 mg (10 mL of 1:10,000 solution) | | **Repeat dosing interval** | Every 3–5 minutes during cardiac arrest | | **Endotracheal dose** | 2–2.5 mg diluted in 10 mL normal saline | | **Maximum cumulative dose** | No limit specified in current guidelines | ### Mechanism of Epinephrine in Cardiac Arrest 1. **α-adrenergic effects** (predominant at high doses): Peripheral vasoconstriction → increased diastolic blood pressure → improved coronary perfusion pressure 2. **β-adrenergic effects**: Increased myocardial contractility and heart rate **High-Yield:** The rationale for repeated dosing is that epinephrine's effects are transient (lasting 5–10 minutes); redosing maintains perfusion pressure throughout the resuscitation attempt. **Warning:** ~~High-dose epinephrine (0.1 mg/kg)~~ is no longer recommended; standard-dose epinephrine (1 mg IV) repeated every 3–5 minutes is the evidence-based approach. **Clinical Pearl:** The goal is to maintain a diastolic blood pressure ≥30 mmHg to ensure adequate coronary perfusion pressure (target CPP ≥20 mmHg). [cite:AHA Guidelines 2020 Update, Harrison 21e Ch 330]