A child with Tetralogy of Fallot develops sudden cyanosis and difficulty breathing while crying. Which position should the nurse place the child in?

1. A

   Supine position

2. B

   Left lateral position

3. C

   Knee-chest position

4. D

   Trendelenburg position

Appeared in: NORCET 8 Prelims-2025

Explanation

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• A hypercyanotic or 'tet' spell is a life-threatening event in children with Tetralogy of Fallot, often triggered by crying or stress, leading to increased right-to-left shunting of deoxygenated blood.
• The knee-chest position is the immediate and most effective first-line intervention for this emergency.
• This position works by kinking the femoral arteries, which increases systemic vascular resistance (SVR).
• The increased SVR makes it more difficult for blood to enter the aorta from the right ventricle, thus redirecting more deoxygenated blood into the pulmonary artery to be oxygenated in the lungs.
• This action effectively reduces the right-to-left shunt, improves blood oxygenation, and alleviates the symptoms of the spell.

Why Other Options Were Wrong

• Option A: The supine (lying flat) position does not alter the hemodynamic pressures in a way that would benefit the child. It fails to increase systemic vascular resistance, so it will not decrease the right-to-left shunt.
• Option B: The left lateral position is a recovery position used to prevent aspiration in an unconscious person. It does not have the specific mechanical effect of increasing systemic vascular resistance needed to manage a tet spell.
• Option D: The Trendelenburg position is contraindicated. It increases venous return to the heart (preload), which increases the volume of blood the already strained right ventricle must pump, potentially worsening the situation.

Related Visual

Clinical Relevance

• Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Emergency management of a hypercyanotic spell in Tetralogy of Fallot in acute care settings.
• Recognizing a tet spell and immediately placing the child in a knee-chest position is a critical, life-saving nursing skill that requires no equipment and can be performed instantly.
• Nurses must remain calm to soothe the child, as agitation worsens the spell. Following positioning, the nurse should administer 100% oxygen and prepare for potential medication administration (e.g., morphine, propranolol) as per protocol.
• Educating parents on how to recognize a tet spell and perform the knee-chest maneuver at home is a vital component of discharge teaching for families of children with TOF.

How to Approach the Question

• Identify the patient's underlying diagnosis: Tetralogy of Fallot, a known cyanotic congenital heart defect.
• Recognize the clinical signs presented in the scenario: sudden cyanosis and difficulty breathing triggered by crying. This is the classic presentation of a 'tet spell' or hypercyanotic crisis.
• Understand the pathophysiology of a tet spell: it's an emergency caused by a sudden increase in the right-to-left shunting of deoxygenated blood, bypassing the lungs.
• Recall the primary goal of immediate intervention: to reverse the shunt by increasing systemic vascular resistance (SVR).
• Evaluate each positioning option based on its physiological effect. The knee-chest position is the specific maneuver that increases SVR by kinking the femoral arteries.
• Eliminate other options: Supine and lateral positions are ineffective, and Trendelenburg is contraindicated as it increases cardiac workload.

Concept Tested & Keywords

• Concept Tested: Emergency management of a hypercyanotic spell in Tetralogy of Fallot.
• Stem keywords: Tetralogy of Fallot, sudden cyanosis, difficulty breathing, crying, child
• Lead-in keywords: Which position
• Clinical cues: The combination of a known diagnosis of Tetralogy of Fallot with the acute onset of cyanosis and dyspnea triggered by crying is the classic presentation of a hypercyanotic or 'tet' spell.

Question ID

Qbu1-ZJvKESsYKrvM4N5ky

Copy ID

Reference Book

E6 Text Book Of Pediatric Nursing 3rd Panchali Pal — Part 2 (pp 239-476 of 713) p. 105-107