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The Importance of Mean Arterial Pressure
Mean Arterial Pressure (MAP) is a critical physiological value representing the average arterial pressure during a single cardiac cycle. While Systolic and Diastolic pressures offer snapshots, MAP provides the most accurate estimate of vital organ perfusion.
Clinical Perfusion Standards
- MAP > 65 mmHg: Considered the minimum pressure required to adequately perfuse the brain, kidneys, and liver in most clinical guidelines.
- MAP < 60 mmHg: High risk of renal failure, cardiac ischemia, and shock states.
Hemodynamic FAQs
How is MAP calculated?
The standard clinical formula is: **MAP = [SBP + (2 × DBP)] / 3**. Diastole accounts for two-thirds of the cardiac cycle, hence the heavier weighting of the diastolic value.
When is a high MAP dangerous?
Persistent high MAP (hypertension) can lead to left ventricular hypertrophy, increased cardiac workload, and higher risk of hemorrhagic stroke.
References
- 1. Surviving Sepsis Campaign: International Guidelines. 2021.
- 2. Guyton and Hall Textbook of Medical Physiology.
Dr. Nikhil Mahajan, PT
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