All are congenital cyanotic heart disease, EXCEPT?

CGHS SSC - 2018

Child Health Nursing (Pediatrics)

Easy

Appeared in: CGHS SSC - 2018

Explanation

Atrial septal defect (ASD) is classified as an acyanotic congenital heart defect.
In ASD, there is an opening in the septum between the left and right atria, which causes a left-to-right shunt.
This means oxygen-rich blood from the left atrium flows back into the right atrium and gets recirculated to the lungs, instead of deoxygenated blood entering the systemic circulation.
Therefore, cyanosis (bluish skin) is not a typical feature of an uncomplicated ASD.

Option A: Truncus arteriosus is a cyanotic heart defect. In this condition, a single large blood vessel comes out of the right and left ventricles, instead of the usual two separate vessels (pulmonary artery and aorta). This leads to the mixing of oxygen-poor and oxygen-rich blood, causing cyanosis.
Option B: Transposition of the great arteries (TGA) is a classic cyanotic heart defect. The positions of the aorta and the pulmonary artery are switched, creating two separate parallel circuits. This prevents oxygenated blood from reaching the body, leading to severe cyanosis shortly after birth.
Option C: Tetralogy of Fallot (TOF) is the most common cyanotic congenital heart disease. It is a combination of four defects that result in a right-to-left shunt, allowing deoxygenated blood to flow directly into the systemic circulation, causing cyanosis.

Clinical Relevance

Nursing practice connection: Knowing Classification of congenital heart diseases (cyanotic vs. acyanotic) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Recognizing the difference between cyanotic and acyanotic heart defects is crucial for nurses for early assessment and intervention. Cyanotic defects are often medical emergencies requiring immediate intervention, while acyanotic defects may be managed more conservatively initially.
Infants with cyanotic defects present with visible cyanosis, poor feeding, and rapid breathing. Nurses must monitor oxygen saturation closely and prepare for potential urgent procedures.
Infants with acyanotic defects like ASD may initially be asymptomatic or show signs of heart failure (e.g., sweating during feeding, poor weight gain) as the left-to-right shunt increases pulmonary blood flow over time.

How to Approach the Question

First, understand the question's structure. It uses the word 'EXCEPT', which means you need to find the option that does not belong to the specified category.
Identify the category mentioned in the stem: 'congenital cyanotic heart disease'.
Recall the fundamental difference between cyanotic and acyanotic heart defects: cyanotic defects involve a right-to-left shunt (deoxygenated blood to the body), while acyanotic defects involve a left-to-right shunt (oxygenated blood recirculated to the lungs).
Evaluate each option against the 'cyanotic' category. A useful mnemonic for common cyanotic defects is the '5 T's' (Tetralogy of Fallot, Transposition of great arteries, Truncus arteriosus, etc.).
Options A, B, and C (Truncus arteriosus, Transposition, Tetralogy) are all 'T's and are classic cyanotic defects.
Option D, Atrial septal defect, is not a 'T' and is a well-known acyanotic defect. Therefore, it is the exception.

Concept Tested & Keywords

Concept Tested: Classification of congenital heart diseases (cyanotic vs. acyanotic)
Stem keywords: congenital, cyanotic heart disease
Lead-in keywords: EXCEPT
Negative lead-in flag: Question asks for the exception

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