A child with Tetralogy of Fallot uses which of the following positions?

HPSSC - 2015

Child Health Nursing (Pediatrics)

Easy

Appeared in: HPSSC - 2015

Explanation

Children with Tetralogy of Fallot (TOF) instinctively adopt a squatting position during episodes of cyanosis and dyspnea (Tet spells).
Squatting increases systemic vascular resistance (SVR) by kinking the femoral arteries.
This increased SWR decreases the amount of deoxygenated blood shunting from the right to the left ventricle across the ventricular septal defect (VSD).
As a result, more blood is directed from the right ventricle into the pulmonary artery, leading to improved oxygenation and relief of cyanosis.
For infants who cannot squat, the equivalent knee-chest position is used by caregivers to achieve the same physiological effect.

Option A: The leaning forward position does not increase systemic vascular resistance and therefore does not correct the underlying pathophysiology of a Tet spell.
Option B: A supine (lying on the back) position does not alter the pressure dynamics in a way that would improve a hypercyanotic spell. It is a neutral position that offers no therapeutic benefit for TOF.
Option C: A prone (lying on the stomach) position does not increase systemic vascular resistance and may even worsen respiratory effort in a child who is already dyspneic.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Compensatory mechanisms and nursing management for Tetralogy of Fallot (TOF) as background academic context rather than a clinical decision trigger.
Recognizing squatting as a compensatory mechanism is crucial for nurses to identify a hypercyanotic spell in a child with known TOF.
Immediate intervention during a Tet spell is critical to prevent severe hypoxia, which can lead to neurological complications or death. The first step is always positioning (knee-chest or squatting).
Patient and family education should include recognizing the signs of a Tet spell and how to perform the knee-chest maneuver on an infant at home while waiting for medical help.

How to Approach the Question

First, identify the core concept of the question: the management of a child with Tetralogy of Fallot (TOF).
Recall the pathophysiology of TOF, specifically that it is a cyanotic heart defect involving a right-to-left shunt of deoxygenated blood.
Think about the term 'Tet spell,' which refers to a hypercyanotic episode.
Evaluate each position based on its physiological effect. Ask yourself: 'How does this position affect blood flow and pressure in the heart and major vessels?'
Recognize that squatting is a classic, well-documented compensatory posture for TOF. Analyze why it works: it increases systemic vascular resistance, which forces more blood into the lungs for oxygenation.
Eliminate the other options by considering their primary uses (e.g., leaning forward for pericarditis) or their lack of effect on the right-to-left shunt.

Concept Tested & Keywords

Concept Tested: Compensatory mechanisms and nursing management for Tetralogy of Fallot (TOF).
Stem keywords: Tetralogy of Fallot, child, position
Lead-in keywords: which of the following
Clinical cues: The diagnosis of Tetralogy of Fallot is a key cue, indicating a cyanotic heart defect with specific pathophysiological responses to positioning.

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