Mean Arterial Pressure in the PICU

Mar 15, 2026

A pediatric critical care team breaks down mean arterial pressure using a septic shock case of a six-year-old. They walk through bedside MAP calculation and pediatric reference formulas. Discussion covers physiological drivers like cardiac output, systemic vascular resistance, autonomic and endocrine regulators. Practical targets, monitoring methods, and management steps for maintaining organ perfusion are highlighted.

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ANECDOTE

Case Calculation Shows MAP Guides Immediate Decisions

A six-year-old in septic shock arrived with a blood pressure of 80/35 and the team calculated MAP before deciding on vasopressors.
Rahul Damania used the formula MAP = DBP + 1/3(SBP−DBP) to show the MAP was 50 mmHg for this child, guiding treatment urgency.

ADVICE

Use Simple Formula For Pediatric MAP Thresholds

Estimate the 5th percentile MAP in children using MAP = 1.5 × age (years) + 40 to help assess hypotension thresholds.
Remember ICU targets may be higher than healthy-child percentiles, so adjust goals for critical illness and organ perfusion.

INSIGHT

MAP As Ohm's Law Links Physiology To Therapy

MAP can be understood as Ohm's law: MAP = cardiac output × systemic vascular resistance, linking physiology to bedside reasoning.
Cardiac output breaks into heart rate × stroke volume, and stroke volume depends on contractility, preload, and afterload.

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In this special “PICU Doc On Call Shorts” episode, pediatric ICU physicians Dr. Monica Gray, Dr. Pradip Kamat, and Dr. Rahul Damania break down the concept of Mean Arterial Pressure (MAP). Using a case of a six-year-old in septic shock, they discuss how to calculate MAP, normal pediatric values, and the physiological determinants and clinical significance of MAP. The hosts highlight MAP’s role in guiding management of critically ill children, review autonomic and endothelial regulation, and reinforce learning with a board-style question. This episode emphasizes practical bedside application for pediatric interns and ICU providers.

Show Highlights:

Overview of Mean Arterial Pressure (MAP) and its clinical significance in pediatric critical care.
Introduction of a clinical case involving a 6-year-old child in septic shock.
Explanation of the formula for calculating MAP and its application to the clinical case.
Discussion of normal reference values for MAP in children and their clinical implications.
Physiological determinants of MAP, including cardiac output and systemic vascular resistance.
Role of the autonomic nervous system in regulating MAP through baroreceptor reflexes.
Importance of maintaining adequate MAP for organ perfusion, particularly in critically ill patients.
Clinical applications of MAP monitoring and management strategies in the PICU.
Summary of key takeaways regarding MAP calculation, physiological determinants, and clinical relevance.
Mention of related topics, such as invasive versus non-invasive blood pressure monitoring.

References:

DeMers D, Wachs D. Physiology, Mean Arterial Pressure. StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing.
Pediatric Blood Pressure Metrics and Hypotension Thresholds (details the task force data used to derive the 5th and 50th percentile MAP estimation formulas for children)
Berlin DA, Bakker J. Starling curves and central venous pressure. Crit Care. 2015 Feb 16;19(1):55.
Magder S. Volume and its relationship to cardiac output and venous return. Crit Care. 2016 Sep 10;20(1):271