Flow Calculator

Calculate required blood flow using BSA or patient weight.

Input Parameters

Select a method and enter patient data.

Clinical Context & Significance

Establishing an appropriate pump flow is one of the most fundamental tasks during cardiopulmonary bypass. The goal is to provide sufficient systemic oxygen delivery ($DO_2$) to meet the metabolic demands of the tissues while minimizing the traumatic effects of the extracorporeal circuit on blood components.

BSA Calculation

This tool uses the DuBois & DuBois formula: $BSA (m^2) = 0.007184 \times Height(cm)^0.725 \times Weight(kg)^0.425$. While multiple formulas exist (Mosteller, Haycock), the DuBois formula remains a clinical standard in cardiac surgery.

Standard Targets

Adults: Typical Cardiac Index of 2.2 - 2.4 L/min/m².
Pediatrics: Higher indexed flows are required due to higher relative metabolic rates (2.8 - 3.2 L/min/m²).
Temperature: indexed flow requirements decrease as the patient is cooled, following the $Q_10$ principle.

Clinical Note: While BSA-based flow is a starting point, true adequacy of perfusion should be assessed using mixed venous saturation ($SvO_2$), lactate levels, and oxygen delivery ($DO_2I$) — see the GDP Dashboard for advanced monitoring.

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.