# Push-Dose Pressors and the Resuscitation Sequence
## Rationale for Push-Dose Pressors
### The Problem
Peri-intubation hypotension is common and independently associated with morbidity and mortality. Induction agents such as propofol, higher-dose ketamine, and etomidate cause varying degrees of vasodilation and myocardial depression. Positive pressure ventilation further drops blood pressure by reducing preload. Traditional vasopressor infusions take time to prepare, mix, and titrate — often 10 to 15 minutes that the patient does not have. The patient needs hemodynamic support now.
### The Concept
Push-dose pressors are small, dilute boluses of vasopressors given by IV push for immediate, short-duration hemodynamic support. They serve as bridge therapy until a vasopressor infusion is established or the hemodynamic insult resolves. Each dose lasts approximately 5 to 15 minutes, giving the clinician time to set up definitive vasopressor support.
## Push-Dose Epinephrine
### Preparation
The preparation begins with cardiac epinephrine: 1 mg in 10 mL, which is a concentration of 100 mcg/mL (1:10,000). One milliliter (100 mcg) is drawn from the cardiac syringe and added to 9 mL of normal saline in a new 10 mL syringe. The final concentration is 10 mcg/mL. The syringe must be clearly labeled.
### Dosing
The dose is 5 to 20 mcg (0.5 to 2 mL) given IV push every 2 to 5 minutes. Starting with 10 mcg is appropriate in most situations, titrating to a target systolic blood pressure above 90 mmHg or MAP above 65 mmHg. Each dose lasts approximately 5 to 10 minutes.
### Mechanism
Push-dose epinephrine works through multiple adrenergic receptors. Alpha-1 stimulation causes vasoconstriction, increasing systemic vascular resistance and MAP. Beta-1 stimulation increases heart rate and contractility. Beta-2 stimulation provides bronchodilation, which is a useful bonus in patients with bronchospasm. The combined alpha and beta activity gives epinephrine more hemodynamic effect than pure alpha agonists like phenylephrine.
### Best Use Cases
Push-dose epinephrine is ideal for cardiac arrest with ROSC and immediate hypotension, post-intubation hypotension, undifferentiated shock while preparing an infusion, and as a bridge in anaphylaxis while an epinephrine infusion is being prepared.
## Push-Dose Phenylephrine
### Preparation
Starting with a phenylephrine 10 mg/mL vial, 1 mL (10 mg) is drawn up and added to a 100 mL normal saline bag, creating a concentration of 100 mcg/mL. The desired amount is then drawn into a syringe from the bag. Alternatively, 0.1 mL of the 10 mg/mL stock can be diluted into 10 mL of normal saline to achieve the same 100 mcg/mL concentration. Clear labeling is essential.
### Dosing
The dose is 50 to 200 mcg IV push every 2 to 5 minutes, typically starting with 100 mcg. Duration of effect is 10 to 15 minutes.
### Mechanism
Phenylephrine is a pure alpha-1 agonist that causes vasoconstriction without any beta effects. It does not increase heart rate or contractility. An important consideration is that it can cause reflex bradycardia through vagal response to the increased afterload.
### Best Use Cases
Phenylephrine is best suited for sedation-induced hypotension (such as from propofol or neuraxial anesthesia) and vasodilatory hypotension where heart rate and contractility are already adequate. It should be avoided in cardiogenic shock and severe bradycardia, where the reflex bradycardia risk could worsen the clinical picture.
## Safety Concerns
### Dosing Errors
The single greatest risk of push-dose pressors is a 10-fold concentration error. Administering 100 mcg/mL when the intended concentration is 10 mcg/mL of epinephrine can cause hypertensive crisis, arrhythmia, or even cardiac arrest. The multi-step dilution process is inherently error-prone under the stress of a resuscitation, and some institutions have abandoned push-dose pressors entirely because of this risk.
### Mitigation Strategies
The safest approach is pre-made syringes prepared by pharmacy, though these are not always available. Standardized preparation protocols posted at the bedside, double-checking with a colleague before administration, always labeling the syringe with drug name and concentration, and using commercially available pre-diluted formulations when possible all reduce the risk of errors.
### Lack of High-Quality Evidence
No randomized controlled trials have compared push-dose pressors to other strategies. The evidence base consists of expert opinion, case series, and physiologic rationale. Safety data is limited to retrospective reviews. Push-dose pressors are endorsed by ACEP and prominent FOAM educators but are not formally recommended in guidelines.
## The Resuscitation Sequence
### Pre-Resuscitation Optimization
Before intubation, hemodynamic optimization should begin. A passive leg raise or IV fluid bolus before induction helps augment preload. Push-dose pressors should be drawn up and ready before intubation begins. An arterial line or continuous non-invasive blood pressure cycling provides real-time hemodynamic monitoring. Pre-oxygenation and apneic oxygenation maximize safe apnea time.
### Hemodynamic Resuscitation Sequence
The sequence unfolds in four stages. Pre-intubation involves assessing hemodynamics, optimizing volume, and preparing push-dose pressors. During the peri-intubation phase, a push-dose pressor is administered with or immediately after induction. Post-intubation, push-dose pressors are titrated while a vasopressor infusion is being established. Finally, during the transition phase, push-dose pressors are weaned as the infusion takes effect.
### Common Vasopressor Infusions for Transition
Norepinephrine at 0.05 to 0.5 mcg/kg/min is first-line for most shock states. Epinephrine infusion at 0.01 to 0.1 mcg/kg/min is used for anaphylaxis, cardiac arrest, and cardiogenic shock. Vasopressin at a fixed dose of 0.04 units/min serves as an adjunct to norepinephrine. Phenylephrine infusion at 0.5 to 5 mcg/kg/min is reserved for pure vasodilatory shock.
| Agent | Dose Range | Primary Indication |
|---|---|---|
| Norepinephrine | 0.05–0.5 mcg/kg/min | First-line for most shock states |
| Epinephrine | 0.01–0.1 mcg/kg/min | Anaphylaxis, cardiac arrest, cardiogenic shock |
| Vasopressin | 0.04 units/min (fixed) | Adjunct to norepinephrine |
| Phenylephrine | 0.5–5 mcg/kg/min | Pure vasodilatory shock |
## Special Considerations
### Cardiac Arrest and Post-ROSC
Immediately after ROSC, push-dose epinephrine at 10 to 20 mcg supports MAP while avoiding the full 1 mg cardiac dose, which can cause re-arrest from hypertension and tachycardia. It serves as a bridge to a norepinephrine or epinephrine infusion.
### Anaphylaxis
Intramuscular epinephrine at 0.3 to 0.5 mg remains the first-line treatment for anaphylaxis. Push-dose IV epinephrine at 10 to 20 mcg is appropriate for refractory hypotension after IM dosing. If recurrent dosing is needed, an epinephrine infusion should be started.
### Sepsis
Norepinephrine infusion is the gold standard for septic shock. Push-dose pressors can temporize while central access is being obtained. Importantly, peripheral norepinephrine infusion through a well-functioning large-bore IV is now considered safe for short periods, so pressors should not be delayed for central access.
A preparation guide illustration showing the step-by-step dilution of push-dose epinephrine. Four sequential panels: (1) A 10 mL cardiac epinephrine syringe labeled "1 mg in 10 mL = 100 mcg/mL"; (2) Drawing 1 mL (100 mcg) from the cardiac syringe into a new 10 mL syringe; (3) Adding 9 mL of normal saline to the new syringe; (4) Final labeled syringe reading "Push-Dose Epinephrine 10 mcg/mL" with dosing instructions "5-20 mcg (0.5-2 mL) IV push q2-5 min." A red warning box highlights the risk of 10x dosing error if the dilution step is skipped.
A flowchart diagram of the resuscitation sequence for peri-intubation hemodynamic management. The flowchart begins with "Pre-intubation Assessment" branching into hemodynamically stable versus unstable paths. The unstable path includes: volume optimization (passive leg raise, fluid bolus), push-dose pressor preparation, arterial line or continuous NIBP. Both paths converge at "Induction," then flow to post-intubation monitoring. If hypotension occurs: administer push-dose pressor, reassess in 2-5 minutes, and simultaneously initiate vasopressor infusion. The endpoint shows transition from push-dose to infusion with hemodynamic stability achieved.
## Clinical Pearls
Push-dose pressors are a bridge, not a destination — every push-dose should be accompanied by a plan for transitioning to a vasopressor infusion. The most dangerous aspect is the preparation step, where a 10-fold concentration error can be lethal. Push-dose pressors should be pre-drawn before intubating any hemodynamically tenuous patient. Phenylephrine is a pure alpha agonist and should be avoided in bradycardic or low-cardiac-output states, as reflex bradycardia may worsen hemodynamics. Push-dose epinephrine at 10 mcg/mL is preferred in most resuscitation scenarios because of its combined alpha and beta effects. Peripheral norepinephrine through a large-bore IV is now considered safe for short-term use, so do not delay pressors for central access. Post-ROSC push-dose epinephrine at 10 to 20 mcg avoids the hemodynamic swings associated with full cardiac doses of 1 mg. If your institution cannot ensure safe bedside preparation, pharmacy pre-mixed syringes or commercial products should be pursued.
## References
- Weingart S. Push-dose pressors for immediate blood pressure control. *Clin Exp Emerg Med*. 2015;2(2):131-132.
- Panchal AR, et al. 2019 AHA Focused Update on ACLS: Use of vasopressors. *Circulation*. 2019;140:e535-e556.
- Acquisto NM, et al. Safety of push-dose phenylephrine and epinephrine. *Am J Emerg Med*. 2020;38:1813-1817.
- Jaber S, et al. INTUBE Study: Peri-intubation complications in critically ill patients. *JAMA*. 2021;325:546-556.
- Holden D, et al. Safety of peripheral vasopressor administration. *J Emerg Med*. 2019;57(4):e115-e119.