What the nurse must do to determine pulse pressure?

Appeared in: SCTIMST Staff Nurse - 2016

Explanation

Pulse pressure is defined as the difference between the systolic blood pressure (the top number) and the diastolic blood pressure (the bottom number).
The correct method to determine it is by subtracting the diastolic value from the systolic value.
This measurement reflects the force the heart generates with each contraction and provides insight into the patient's stroke volume and arterial elasticity.
A normal pulse pressure is typically in the range of 40-60 mmHg.

Option A: Multiplying the heart rate by the stroke volume calculates the cardiac output, which is the total amount of blood pumped by the heart in one minute.
Option C: Simply averaging the systolic and diastolic pressures is an incorrect method for calculating blood pressure dynamics. This option vaguely refers to the Mean Arterial Pressure (MAP), but the calculation is wrong.
Option D: Calculating the difference between the apical and radial pulse rates determines the pulse deficit.

Clinical Relevance

Nursing practice connection: Knowing Calculation and interpretation of pulse pressure helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Monitoring pulse pressure is crucial in critically ill patients, as a narrowing pulse pressure (e.g., 100/85 mmHg, PP=15) can be an early sign of decreased cardiac output and impending shock.
A consistently wide pulse pressure (e.g., 150/70 mmHg, PP=80) can indicate cardiovascular issues like aortic regurgitation or atherosclerosis and is a risk factor for cardiovascular disease.
What if? If a patient's BP is 90/75 mmHg, the pulse pressure is only 15 mmHg. This is a critically narrow pulse pressure, signaling potential hypovolemia, heart failure, or cardiac tamponade, and requires immediate reporting and intervention.

How to Approach the Question

This is a factual recall question that tests the definition of a key cardiovascular parameter.
Identify the core concept in the question: 'determine pulse pressure'.
Recall the definition of pulse pressure. It is the mathematical difference between the two components of a blood pressure reading.
Evaluate each option against this definition.
Option B directly states 'Subtract the diastolic from the systolic BP pressure,' which perfectly matches the definition.
Mentally check the other options to confirm they define different concepts (Cardiac Output, MAP, Pulse Deficit) to be certain of your answer.

Concept Tested & Keywords

QUGwi3mgoOW35-dLJHWz1R

E6 Nursing Fundamentals Taylor p. 151-153

E6 Nursing Vital Signs pp. 80-82, 76-78

Practise the full SCTIMST Staff Nurse - 2016

Attempt every question from this paper in a timed mock, then review the full solution for each one.