ATI TEAS (Test of Essential Academic Skills) Version 7MathematicsEasy
A patient's blood pressure is measured at 140/90 mmHg. The physician asks the nurse to calculate the Mean Arterial Pressure (MAP). What is the patient's MAP, rounded to the nearest whole number?
- A110 mmHg
- B120 mmHg
- C107 mmHg
- D100 mmHg
Show answer & explanationAnswer & explanation
Correct answer: C. 107 mmHg
Mean Arterial Pressure (MAP) is calculated using the formula: MAP = Diastolic Pressure + 1/3(Systolic Pressure - Diastolic Pressure). Plugging in the given values, MAP = 90 + 1/3(140 - 90) = 90 + 1/3(50) = 90 + 16.66... = 106.66..., which rounds to 107 mmHg.
Why the other options are wrong
- A. This calculation likely rounds prematurely or uses an incorrect fraction for the pulse pressure.
- B. This calculation is significantly higher, possibly an incorrect average or misapplication of the formula.
- D. This calculation incorrectly uses 1/2 instead of 1/3 for the pulse pressure or miscalculates the addition.
Mean Arterial Pressure (MAP)
MAP is the average arterial pressure throughout one cardiac cycle, indicating the perfusion of organs and tissues.
- Calculated using systolic and diastolic blood pressures.
- Formula: MAP = Diastolic Pressure + 1/3(Systolic Pressure - Diastolic Pressure).
- Normal range is typically 70-100 mmHg.
Memory trick: My Arterial Pressure is Diastolic Plus One Third of the Pulse.