Difference between systolic and diastolic blood pressure is known as

RRB Nsg. Superintendent-20 July 2019 (Shift-3rd)

Applied Physiology

Easy

Appeared in: RRB Nsg. Superintendent-20 July 2019 (Shift-3rd)

Explanation

Pulse pressure is the specific medical term for the difference between the systolic and diastolic blood pressure readings.
It is calculated by subtracting the diastolic pressure from the systolic pressure (Formula: Systolic BP - Diastolic BP = Pulse Pressure).
This value represents the force the heart generates with each contraction. A normal pulse pressure is generally considered to be between 40 and 60 mmHg.

Option A: High blood pressure, or hypertension, is a diagnosis for a condition where the overall force of blood against artery walls is consistently too high. It is not the term for the difference between systolic and diastolic pressures.
Option B: Low blood pressure, or hypotension, is a condition where blood pressure is below the normal range, potentially causing symptoms like dizziness. It does not describe the difference between the two pressure measurements.
Option D: Hydrostatic pressure is the pressure exerted by a fluid at rest due to gravity. In the circulatory system, it contributes to overall blood pressure but is not the specific term for the difference between systolic and diastolic readings.

Visual 1: Diagram: A blood pressure waveform graph showing the peaks and troughs, with clear labels for Systolic Pressure (peak), Diastolic Pressure (trough), and the Pulse Pressure as the vertical distance between them.

Clinical Relevance

Nursing practice connection: Knowing Definition of Pulse Pressure helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses monitor pulse pressure as it provides valuable clues about a patient's cardiovascular health and hemodynamic stability. It reflects the heart's stroke volume and arterial stiffness.
A consistently wide pulse pressure (greater than 60 mmHg) can indicate stiff arteries (arteriosclerosis), while a narrow pulse pressure (less than 40 mmHg) can suggest poor heart function or low blood volume.
What if? If a patient's blood pressure is 90/75 mmHg, the pulse pressure is very narrow (15 mmHg). This is a critical finding, often seen in conditions like cardiac tamponade or cardiogenic shock, and requires immediate escalation as it indicates the heart is failing to pump an adequate amount of blood with each beat.

How to Approach the Question

Step 1: Identify the core keywords in the question: 'difference', 'systolic', and 'diastolic blood pressure'.
Step 2: Recognize that the question is asking for the specific medical term for this calculated value, not a description of a condition.
Step 3: Systematically evaluate the options based on their definitions.
Step 4: Recall that 'High blood pressure' and 'Low blood pressure' are conditions, not calculated differences.
Step 5: Recall that 'Hydrostatic pressure' is a related but different physiological concept.
Step 6: Conclude that 'Pulse pressure' is the precise term for the mathematical difference between systolic and diastolic pressures.

Concept Tested & Keywords

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