What is orthostatic hypotension?

UPUMS Nsg officer-2023

Medical & Surgical Nursing

Easy

Appeared in: UPUMS Nsg officer-2023

Explanation

Orthostatic hypotension, or postural hypotension, is defined by a significant drop in blood pressure upon moving to an upright position.
The correct option accurately describes this event: a sudden drop in BP when an individual changes from a lying or sitting position to a standing position.
This occurs because the body's autonomic nervous system fails to adequately constrict lower extremity blood vessels and increase heart rate to compensate for the effects of gravity.
The diagnostic criteria are a decrease in systolic BP of at least 20 mm Hg or a decrease in diastolic BP of at least 10 mm Hg within three minutes of standing.

Option A: This describes the opposite body movement. Orthostatic hypotension is triggered by moving against gravity (e.g., sitting to standing), not with it (standing to sitting).
Option B: This is the definition of general hypotension (low blood pressure), not specifically orthostatic hypotension, which is defined by the positional change.
Option D: This option describes a slight increase in blood pressure upon standing, which is a normal physiological response to maintain cerebral perfusion. Orthostatic hypotension involves a drop in pressure.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition and characteristics of orthostatic (postural) hypotension as background academic context rather than a clinical decision trigger.
Nurses must assess for orthostatic hypotension in at-risk patients (e.g., elderly, dehydrated, on certain medications like antihypertensives) to prevent falls.
Patient education is a key nursing role, focusing on teaching slow position changes, ensuring adequate hydration, and recognizing symptoms like dizziness or lightheadedness.
What if? If a patient experiences a significant BP drop upon standing but reports no symptoms (asymptomatic orthostatic hypotension), they are still at an increased risk for falls. The nurse should still implement fall precautions and educate the patient, as symptoms may not always be present before a fall occurs.

How to Approach the Question

First, read the question and identify the core concept: 'orthostatic hypotension'.
Mentally recall the definition of this term. It involves a 'postural' or 'orthostatic' (related to standing upright) drop in blood pressure.
Evaluate each option against this definition.
Option A describes the wrong direction of movement (standing to sitting).
Option B gives a value for general hypotension, not the specific positional type.
Option C correctly describes the change from a lying/sitting to a standing position causing a BP drop.

Concept Tested & Keywords

Concept Tested: Definition and characteristics of orthostatic (postural) hypotension.
Stem keywords: orthostatic hypotension, blood pressure, position change
Lead-in keywords: What is
Negative lead-in flag: false

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