What Are Push-Dose Pressors?
Push-dose pressors are diluted vasopressor medications administered as small intravenous boluses to manage critical hypotension when a continuous infusion is not immediately available. They provide a bridge to definitive hemodynamic support and are particularly useful in prehospital care where infusion pumps may not be standard equipment on every unit.
When Push-Dose Pressors Are Indicated
Consider push-dose pressors for patients with:
- Post-ROSC hypotension after cardiac arrest
- Symptomatic bradycardia not responding to atropine
- Severe sepsis with refractory hypotension
- Anaphylaxis with persistent hypotension despite IM epinephrine
- Drug-induced hypotension (beta-blocker or calcium channel blocker toxicity)
- Spinal shock with neurogenic hypotension
Push-Dose Epinephrine
Push-dose epinephrine is the most commonly used push-dose pressor in EMS. The typical preparation involves diluting cardiac epinephrine to create a concentration of 10 mcg/mL. The standard dose is 10 to 20 mcg (1 to 2 mL of the diluted solution) administered IV every 2 to 5 minutes as needed to maintain adequate blood pressure.
Preparation: Take 1 mL of 1:10,000 epinephrine (100 mcg) and add it to 9 mL of normal saline. This creates 10 mL of solution at 10 mcg/mL. Clearly label the syringe. Some agencies carry pre-made dilutions or use commercially prepared syringes to reduce preparation errors.
Safety Precautions
Push-dose pressors require extreme attention to dosing accuracy. The most dangerous error is inadvertently administering undiluted cardiac epinephrine at push-dose intervals. This can cause severe hypertension, tachyarrhythmias, and cardiac arrest. Always verify your concentration before administration. Use the two-provider verification method: have your partner independently confirm the drug, concentration, and dose.
Monitor the patient's blood pressure and heart rate continuously after each dose. Titrate to a target systolic blood pressure (typically 90 mmHg or as specified by protocol). Be prepared to manage adverse effects including tachycardia and hypertension. Document each dose, the time administered, and the hemodynamic response. Push-dose pressors are a temporizing measure; initiate continuous infusion or arrange for definitive care as soon as possible.