What should be the normal blood pressure of an adult?

RRB Staff Nurse Jaipur-6th June 2018

Nursing Foundation

Easy

Appeared in: RRB Staff Nurse Jaipur-6th June 2018

Explanation

A blood pressure of 120/80 mm Hg is the established benchmark for normal blood pressure in a healthy adult.
According to the American Heart Association (AHA) guidelines, normal blood pressure is defined as a systolic reading of less than 120 mm Hg and a diastolic reading of less than 80 mm Hg.
Systolic pressure represents the force when the heart beats, while diastolic pressure is the force when the heart rests between beats.

Option B: A blood pressure of 130/90 mm Hg falls into the Stage 1 Hypertension category, not the normal range.
Option C: This option is physiologically impossible because systolic pressure must be higher than diastolic pressure. The values are inverted.
Option D: This option is also physiologically impossible as the systolic pressure is listed as lower than the diastolic pressure.

Visual 1: Infographic: A chart showing the different categories of blood pressure (Normal, Elevated, Hypertension Stage 1, Stage 2, Hypertensive Crisis) with their corresponding systolic and diastolic ranges.
Visual 2: Diagram: An illustration showing the correct placement of a blood pressure cuff on the arm and the positioning of the stethoscope over the brachial artery.

Clinical Relevance

Nursing practice connection: Knowing Normal blood pressure values and hypertension classification in adults helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Accurate blood pressure measurement is a fundamental nursing skill critical for diagnosing hypertension, assessing cardiovascular risk, and monitoring treatment effectiveness.
Nurses must use the correct cuff size; a cuff that is too small can falsely elevate the reading, and one that is too large can falsely lower it, leading to misdiagnosis or improper treatment.
What if? If a patient's reading is 135/82 mm Hg on two separate occasions, the nurse should identify this as Stage 1 Hypertension, provide patient education on lifestyle modifications, and ensure follow-up with a healthcare provider is scheduled.

How to Approach the Question

First, identify the core of the question: it asks for the 'normal' blood pressure value for an adult.
Recall the standard physiological values taught in nursing fundamentals. The textbook value for normal BP is a key piece of information.
Evaluate each option. Option A (120/80) is the classic normal value.
Analyze the distractors. Option B (130/90) is elevated and classified as hypertension. Options C and D are physiologically impossible because systolic pressure must be greater than diastolic pressure. This inversion is a common distractor technique used in exams.
Based on this analysis, select the option that represents the established normal range.

Concept Tested & Keywords

Concept Tested: Normal blood pressure values and hypertension classification in adults.
Stem keywords: normal blood pressure, adult
Lead-in keywords: What should be

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