AIIMS Raipur lecturer 2021
Medical & Surgical Nursing
Easy
Which one of the following heart diseases is a cyanotic heart disease?
Appeared in: AIIMS Raipur lecturer 2021
Explanation
- Tetralogy of Fallot (TOF) is the most common form of cyanotic congenital heart disease.
- It involves a combination of four heart defects, the most critical being pulmonary stenosis and a ventricular septal defect (VSD).
- The pulmonary stenosis obstructs blood flow to the lungs, increasing pressure in the right ventricle.
- This high pressure forces deoxygenated (blue) blood from the right ventricle to flow through the VSD into the aorta (a right-to-left shunt).
- The mixing of deoxygenated blood with systemic circulation results in cyanosis, a bluish discoloration of the skin.
Why Other Options Were Wrong
- Option A: Patent Ductus Arteriosus (PDA) is an acyanotic heart defect. The ductus arteriosus is a connection between the aorta and pulmonary artery that normally closes after birth. When it remains open, high-pressure, oxygenated blood from the aorta flows into the lower-pressure pulmonary artery (a left-to-right shunt).
- Option B: Isolated Pulmonary Valve Stenosis is classified as an obstructive lesion, which is typically acyanotic. It obstructs blood flow from the right ventricle to the lungs but does not inherently cause a shunt. Cyanosis does not occur unless the stenosis is critically severe, leading to right heart failure, or if another defect (like an ASD or PFO) allows for a right-to-left shunt.
- Option D: Ventricular Septal Defect (VSD) is the most common congenital heart defect and is typically acyanotic. The hole between the ventricles allows high-pressure, oxygenated blood from the left ventricle to flow into the lower-pressure right ventricle (a left-to-right shunt).
Related Visual
Clinical Relevance
- Nursing practice connection: Knowing Classification of Congenital Heart Defects (Cyanotic vs. Acyanotic) helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
- Nurses must be skilled in assessing for cyanosis in newborns and infants, which can be subtle. Central cyanosis (blue lips, tongue) is a more specific sign of a cardiac or pulmonary issue than peripheral cyanosis (blue hands/feet).
- Infants with TOF may experience hypercyanotic episodes, or 'tet spells,' often triggered by crying or feeding. During a spell, the infant becomes profoundly blue and may lose consciousness. A key nursing intervention is to place the infant in a knee-chest position to increase systemic vascular resistance and promote blood flow to the lungs.
- What if? If a child with a large VSD develops severe pulmonary hypertension over many years, the pressure in the right ventricle can exceed the left. This reverses the shunt to right-to-left (Eisenmenger syndrome), causing the child to become cyanotic. This is a late and severe complication, distinguishing it from TOF where cyanosis is an early feature.
How to Approach the Question
- Identify the core question: The question asks to identify the cyanotic congenital heart disease from the list.
- Recall the major classifications of congenital heart disease: acyanotic and cyanotic.
- Understand the basic pathophysiology: Acyanotic defects typically involve a left-to-right shunt (e.g., VSD, ASD, PDA) or obstruction without a shunt. Cyanotic defects involve a right-to-left shunt, allowing deoxygenated blood to enter systemic circulation.
- Review the options based on this classification. A helpful mnemonic for common cyanotic defects is the '5 T's': Tetralogy of Fallot, Transposition of the great arteries, Tricuspid atresia, Truncus arteriosus, and Total anomalous pulmonary venous return.
- Evaluate each option: PDA and VSD are classic left-to-right (acyanotic) shunts. Isolated pulmonary stenosis is an obstruction, also acyanotic.
- Conclude that Tetralogy of Fallot is the only option that is a primary cyanotic heart defect.
Concept Tested & Keywords
- Concept Tested: Classification of Congenital Heart Defects (Cyanotic vs. Acyanotic)
- Stem keywords: heart diseases, cyanotic heart disease
- Lead-in keywords: Which one
Question ID
QHvokYDXJP8WiOvt4iGM9a
Reference Book
E6 Pathology-Textbook of PATHOLOGYHarsh Mohan Part 2 (215-514) pp. 2-4, 1
E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 444-446
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