Max dose of vasopressin
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vasopressin dose septic shock
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Here is a complete summary on vasopressin dosing:
Vasopressin - Maximum Dose
Septic Shock / Distributive Shock (most common clinical context)
| Parameter | Detail |
|---|---|
| Standard dose | 0.03-0.04 units/min (fixed infusion, NOT titrated) |
| Max recommended dose | 0.03-0.04 units/min |
| When to add | When norepinephrine requirements exceed ~5 mcg/min |
| High-dose vasopressin | NOT recommended - carries significant ischemic risk |
Key points from authoritative sources:
- Vasopressin is added as a fixed-dose adjunct to norepinephrine to reduce catecholamine requirements, not titrated to effect like other vasopressors.
- Goldman-Cecil Medicine: "Vasopressin (up to 0.03 U/min) may be added in patients not responding adequately to norepinephrine to increase mean arterial pressure and to decrease norepinephrine dose." (Goldman-Cecil Medicine, Circulatory Therapy section)
- Sabiston Surgery: "The dose is 0.04 units/min and may decrease norepinephrine requirements to maintain the blood pressure. High-dose vasopressin is not recommended." (Sabiston Textbook of Surgery, Distributive Shock section)
Cardiac Arrest (ACLS)
| Indication | Dose |
|---|---|
| Cardiac arrest (historical use) | 40 units IV single bolus (as an alternative to first or second dose of epinephrine) |
| Current ACLS status | Removed from 2015+ AHA guidelines - no survival benefit over epinephrine |
GI Bleeding / Portal Hypertension (vasopressin infusion)
| Phase | Dose |
|---|---|
| Bolus | 20 units IV over 20 minutes |
| Maintenance infusion | 0.2-0.4 units/min |
| Maximum infusion | 0.9 units/min |
Gynecologic/Surgical Use (intramyometrial injection)
- Maximal safe dose not well established
- Guidelines suggest < 5 units total to avoid cardiovascular collapse from inadvertent intravascular injection (Berek & Novak's Gynecology)
Key Safety Notes
- Doses > 0.04 units/min in septic shock are associated with digital/mesenteric ischemia, skin necrosis, and cardiac arrest
- Vasopressin should never be used as the sole first-line vasopressor - always adjunctive to norepinephrine in septic shock
- Surviving Sepsis Campaign 2021 supports 0.03-0.04 units/min as the ceiling for septic shock
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