Which of the following is Cyanotic Congenital Heart Disease?

UPPSC 2023

Child Health Nursing (Pediatrics)

Easy

Appeared in: UPPSC 2023

Explanation

Tetralogy of Fallot (TOF) is a classic cyanotic congenital heart defect.
It involves a right-to-left shunt, meaning deoxygenated blood from the right ventricle bypasses the lungs and enters the systemic circulation through a ventricular septal defect (VSD) and an overriding aorta.
The key feature causing this shunt is pulmonary stenosis, which obstructs blood flow to the lungs and increases pressure in the right ventricle.
This mixing of deoxygenated blood with oxygenated blood leads to systemic hypoxemia and visible cyanosis.

Option A: Atrial septal defect (ASD) is an acyanotic heart defect. It involves a hole between the atria, causing a left-to-right shunt where oxygenated blood flows from the high-pressure left atrium to the lower-pressure right atrium.
Option B: Ventricular septal defect (VSD) is the most common congenital heart defect and is typically acyanotic. The hole between the ventricles allows a left-to-right shunt of oxygenated blood due to higher pressure in the left ventricle.
Option C: Patent ductus arteriosus (PDA) is an acyanotic defect. The failure of the ductus arteriosus to close after birth creates a connection between the aorta and pulmonary artery, resulting in a left-to-right shunt.

Clinical Relevance

Nursing practice connection: Knowing Classification of Congenital Heart Disease (Cyanotic vs. Acyanotic) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Nurses must be able to differentiate between cyanotic and acyanotic heart defects to anticipate patient presentations and prioritize care. A key nursing assessment is monitoring for central cyanosis (lips, tongue) and peripheral cyanosis, along with oxygen saturation via pulse oximetry.
A hallmark of Tetralogy of Fallot is hypercyanotic episodes, or 'tet spells,' often triggered by crying or feeding. Nurses must recognize these spells (sudden, deep cyanosis, and rapid breathing) and intervene immediately by placing the infant in a knee-chest position to increase systemic vascular resistance and improve pulmonary blood flow.
What if? If a child with a long-standing acyanotic defect like a large VSD develops cyanosis later in life, it may indicate the development of Eisenmenger syndrome. This is a severe complication where chronic pulmonary overcirculation leads to irreversible pulmonary hypertension, causing the shunt to reverse from left-to-right to right-to-left. This is a medical emergency and indicates a poor prognosis.

How to Approach the Question

First, identify the key term in the question: 'Cyanotic Congenital Heart Disease'.
Recall the definition of cyanotic vs. acyanotic heart defects. Cyanotic involves a right-to-left shunt (deoxygenated blood enters systemic circulation), while acyanotic involves a left-to-right shunt.
Systematically evaluate each option based on this definition.
Atrial septal defect, ventricular septal defect, and patent ductus arteriosus are all classic examples of acyanotic defects with left-to-right shunts.
Tetralogy of Fallot is the classic example of a cyanotic defect. If you remember the '5 Ts' mnemonic for cyanotic defects (Tetralogy of Fallot, Transposition, Tricuspid Atresia, etc.), you can quickly identify the correct answer.

Concept Tested & Keywords

Concept Tested: Classification of Congenital Heart Disease (Cyanotic vs. Acyanotic)
Stem keywords: Cyanotic, Congenital Heart Disease
Lead-in keywords: Which

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E6 Pathology- ROBBINS & COTRAN PATHOLOGIC BASIS OF DISEASE 10TH Ed pp. 541-543, 542-544

E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 444-446