How can you derive the seconds to subtract from timing to MAP?

To derive the seconds to subtract from timing to find the MAP (Mean Arterial Pressure), taking 10% of the HAT (Height Adjustment Time) is the correct method. This approach is commonly used because it provides a significant yet reasonable adjustment based on the relationship between height and arterial pressure.

Using 10% strikes a balance as it is substantial enough to account for physiological differences that can affect MAP without being overly drastic. This method is grounded in research and clinical practice, allowing for an effective and standardized way of adjusting timing based on various individual factors.

The other percentages like 20%, 5%, or 50% may not provide the correct adjustments as they either overshoot or undershoot what is needed for a reliable estimation. Thus, 10% serves as a practical and efficient benchmark for these calculations.