Hemodynamic Assessment and Cardiac Output in the PICU

• Dr. Ahmed (Gamal) Sherif — Paediatric Intensive Care Consultant, Cambridge University Hospitals NHS Foundation Trust; Co-Founder, Edu-PIC

Paediatrics

Hemodynamic assessment in the pediatric intensive care unit is focused on maintaining adequate oxygen delivery and preserving tissue health. Cardiac output is central to hemodynamics because oxygen delivery depends substantially on effective circulation. Cardiac output is influenced by heart rate and stroke volume, with both requiring careful assessment in critically ill children. Pediatric patients, particularly infants, have greater compensatory capacity than adults and can markedly increase heart rate to maintain cardiac output despite reduced stroke volume. Higher vascular resistance can further mask early circulatory deterioration. Consequently, a child may maintain apparently normal blood pressure despite significant physiological compensation and evolving hemodynamic instability. A normal blood pressure should therefore not be interpreted in isolation as evidence of hemodynamic stability.