# A 3-year-old toddler with tetralogy of Fallot is admitted to the pediatric unit. The nurse observes the toddler having a hypercyanotic spell (tet spell). What is the priority nursing intervention?

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> subject: Child Health

## 문제

A 3-year-old toddler with tetralogy of Fallot is admitted to the pediatric unit. The nurse observes the toddler having a hypercyanotic spell (tet spell). What is the priority nursing intervention?

## 보기

1. Place the infant in a knee-chest position **✔ 정답**
2. Administer oxygen via nasal cannula
3. Notify the physician immediately
4. Prepare for emergency intubation

**정답: 1**

## 해설

The priority intervention is placing the child in a knee-chest position to increase systemic vascular resistance, which reduces right-to-left shunting and improves oxygenation. Administering oxygen and notifying the physician are important but secondary actions. Emergency intubation is not the immediate priority.

## 심화 해설

Understanding the Priority Intervention for a Hypercyanotic Spell

The immediate priority during a hypercyanotic spell (tet spell) is to break the cycle of paroxysmal hypoxia, acidosis, and increased pulmonary vascular resistance. In tetralogy of Fallot, a spell is triggered by a sudden decrease in systemic vascular resistance (SVR) or an increase in pulmonary vascular resistance, which worsens the right-to-left shunt across the ventricular septal defect. The knee-chest position is the first and most critical physical intervention because it mechanically increases SVR by flexing the large arteries at the groin and reducing venous return from the lower extremities. This increase in left-sided pressure forces blood through the pulmonary artery rather than across the septal defect, immediately improving pulmonary blood flow and oxygenation.

This intervention directly addresses the pathophysiology described in the resuscitation algorithm for a hypoxic pediatric patient, where stabilizing the condition through maneuvers that manipulate hemodynamics takes precedence [1]. While cardiac emergencies in children require early recognition and management to prevent comorbidity, the specific etiology of the lesion dictates the immediate action [2]. For a cyanotic spell related to tetralogy of Fallot, physical positioning to alter hemodynamics is the most rapid and effective way to reverse the shunt before escalating to other measures.

The other options are important but are secondary to this initial maneuver. Administering oxygen via nasal cannula (Option 2) is often ineffective as a sole intervention because the primary problem is not a lack of oxygen in the environment but restricted pulmonary blood flow; oxygen can be applied concurrently after positioning. Notifying the physician (Option 3) is always necessary but should never delay a nursing intervention that can immediately stabilize the child. Preparing for emergency intubation (Option 4) is reserved for spells that are refractory to positioning and other pharmacological interventions, such as morphine or beta-blockers, and is not the first-line nursing action.

References (research sources)

- [1]Delayed Presentation of Tetralogy of Fallot with Isolated Cyanosis.Research articleZemore Z, Sharma A, Carter K, Baghdassarian A. (2018) · DOI: 10.1155/2018/7412869

- [2]Cardiac emergencies in neonates and young infants.Research articleKabbani N, Kabbani MS, Al Taweel H. (2017) · DOI: 10.4103/2231-0770.197506

## 임상 시나리오

Clinical Management of a Hypercyanotic Spell

Immediate Nursing Actions

- **First Priority:** Place the child in the knee-chest position. This is a non-invasive, rapid maneuver that increases systemic vascular resistance (SVR) to reverse the right-to-left shunt.

- Provide a calm, quiet environment and use a soft, soothing voice to reduce the child's anxiety and oxygen consumption.

- Administer 100% oxygen by face mask if available, but do not delay positioning to obtain equipment.

- If the spell persists, administer prescribed medications such as morphine sulfate (to reduce respiratory drive and systemic venous return) or intravenous fluids to increase preload and SVR.

Escalation Protocol

- If the knee-chest position and oxygen do not break the spell within a few minutes, notify the physician or rapid response team immediately.

- Prepare for advanced interventions, which may include intravenous beta-blockers (e.g., propranolol) or emergency surgical shunt placement.

- Intubation and mechanical ventilation are reserved for severe, refractory spells with progressive hypoxemia or loss of consciousness.

Family Education and Prevention

- Teach caregivers to recognize early signs of a spell (irritability, deepening cyanosis, hyperpnea) and to immediately place the child in the knee-chest position.

- Instruct parents to avoid triggers such as prolonged crying, dehydration, and hot baths which can decrease SVR.

- Ensure families have an emergency plan and know when to call emergency services.

## 핵심 개념

- **Hypercyanotic Spell** — A sudden, severe episode of cyanosis and hypoxia in children with Tetralogy of Fallot, triggered by a decrease in systemic vascular resistance or increased pulmonary resistance.
- **Knee-Chest Position** — A physical maneuver that increases systemic vascular resistance by flexing the femoral arteries and reducing venous return, thereby forcing blood into the pulmonary artery.
- **Right-to-Left Shunt** — The abnormal flow of deoxygenated blood from the right side of the heart to the left side through a ventricular septal defect, bypassing the lungs.
- **Systemic Vascular Resistance** — The resistance the left ventricle must overcome to pump blood through the systemic circulation; increasing it can counteract a right-to-left shunt.

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