Drug Calculations
Calculate drug dilutions and infusion rates.
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Clinical Pharmacology: Volumetric Drug Dilutions and Continuous Infusion Rates
Physiological Principles & Clinical Context
Cardiovascular perfusionists and anesthesia professionals routinely prepare and deliver vasoactive, inotropic, and chronotropic therapies to optimize tissue perfusion, manage systemic vascular resistance, and facilitate weaning from bypass. Due to the high potency of clinical cardiovascular medications (e.g., Norepinephrine, Epinephrine, Milrinone), concentrated stock solutions must be precisely diluted into a carrier volume to allow micro-dosed delivery. Accurate mathematical preparation is critical to avoid catastrophic drug errors and establish continuous, stable therapeutic concentrations.
Clinical Targets & Safe Ranges
- •Norepinephrine (Levophed) Infusion: Standardly dosed between 0.02 to 0.20 mcg/kg/min.
- •Epinephrine (Adrenaline) Infusion: Standardly dosed between 0.01 to 0.10 mcg/kg/min.
- •Milrinone (Primacor) Infusion: Standardly dosed between 0.375 to 0.750 mcg/kg/min.
- •Vasopressin (Pitressin) Infusion: Standardly dosed between 0.01 to 0.04 Units/min.
Mathematical Formulation
- ƒStock Drug Concentration: Stock Conc (mg/mL) = Total Drug Weight (mg) / Total Solution Volume (mL)
- ƒDilution Volumetric Ratio: Volume of Stock = Desired Concentration × Desired Volume / Stock Concentration
- ƒInfusion Pump Rate: Rate (mL/hr) = [ Dose Rate (mcg/kg/min) × Weight (kg) × 60 ] / [ Concentration (mg/mL) × 1000 ]
Academic & Clinical References
- Edmonds HL Jr, Grocott HP. Drug delivery during cardiopulmonary bypass. J Extra Corpor Technol. 2001;33(2):98-105.
- Stoelting RK, Hillier SC. Pharmacology & Physiology in Anesthetic Practice. 4th ed. Philadelphia: Lippincott Williams & Wilkins; 2006.
Medical Disclaimer
This application is intended for educational and reference purposes for qualified perfusionists and cardiac surgical professionals. The clinical information and calculations provided should not substitute for professional clinical judgment or institutional protocols. Always verify results with independent calculations and equipment. Perfi does not assume liability for clinical decisions made based on this software.