The normal ratio of Systolic, Diastolic and Pulse pressure is?

AIIMS Bhopal NO - 2018 (Shift-1st)

Applied Physiology

Medium

Appeared in: AIIMS Bhopal NO - 2018 (Shift-1st)

Explanation

The solution requires understanding the definitions of systolic pressure (peak arterial pressure), diastolic pressure (minimum arterial pressure), and pulse pressure.
A standard reference for normal blood pressure in a healthy adult is approximately 120/80 mmHg.
Pulse pressure is calculated by subtracting the diastolic pressure from the systolic pressure (SBP - DBP).
Using the reference values, the pulse pressure is 120 - 80 = 40 mmHg.
The ratio of Systolic : Diastolic : Pulse Pressure is therefore 120 : 80 : 40.
Simplifying this ratio by dividing all parts by 40 yields the final ratio of 3:2:1.

Option A: This ratio incorrectly suggests that diastolic pressure is greater than systolic pressure and that pulse pressure is the largest component, which contradicts the fundamental definitions of these pressures.
Option B: This ratio does not correspond to the proportional relationship between the standard values of 120 mmHg (systolic), 80 mmHg (diastolic), and 40 mmHg (pulse pressure).
Option C: This is the reverse of the correct ratio. It incorrectly implies that systolic pressure is the smallest value and pulse pressure is the largest.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Relationship between Systolic, Diastolic, and Pulse Pressure as background academic context rather than a clinical decision trigger.
Understanding the relationship between systolic, diastolic, and pulse pressure is fundamental for assessing a patient's cardiovascular status. Abnormalities can signal underlying health issues.
A widened pulse pressure (e.g., greater than 60 mmHg) can be a predictor of cardiovascular problems, especially in older adults, and may indicate conditions like atherosclerosis or aortic regurgitation.
A narrowed pulse pressure (e.g., less than 25% of the systolic value) can indicate reduced cardiac output, as seen in conditions like heart failure or shock.

How to Approach the Question

First, identify the three key terms in the question: Systolic pressure, Diastolic pressure, and Pulse pressure.
Recall the standard, textbook value for a normal blood pressure, which is 120/80 mmHg. Here, 120 is the systolic pressure and 80 is the diastolic pressure.
Remember the formula for calculating pulse pressure: Pulse Pressure = Systolic Pressure - Diastolic Pressure.
Apply the formula using the standard values: 120 - 80 = 40 mmHg. This is your pulse pressure value.
Arrange the three values in the order specified by the question: Systolic : Diastolic : Pulse Pressure.
Set up the ratio with the numerical values: 120 : 80 : 40.

Concept Tested & Keywords

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