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:

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

References:

1. DeMers D, Wachs D. Physiology, Mean Arterial Pressure. StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing.
2. 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)
3. Berlin DA, Bakker J. Starling curves and central venous pressure. Crit Care. 2015 Feb 16;19(1):55.
4. Magder S. Volume and its relationship to cardiac output and venous return. Crit Care. 2016 Sep 10;20(1):271