Cyanotic congenital heart disease vs Acyanotic congenital heart disease
How to tell Cyanotic congenital heart disease and Acyanotic congenital heart disease apart when a board question makes them look alike.
Cyanotic disease has right-to-left shunt/desaturation; acyanotic disease is left-to-right or obstructive without early blue color.
Side by side
Cyanotic congenital heart disease causes right-to-left shunting with low oxygen saturation; the 5 Ts include tetralogy, transposition, truncus arteriosus, tricuspid atresia, and TAPVR.
Acyanotic congenital heart disease usually causes left-to-right shunt or obstruction without early cyanosis, such as VSD, ASD, PDA, coarctation, or aortic stenosis.
Cyanotic congenital heart disease causes right-to-left shunting, low oxygen saturation, blue discoloration, and examples like tetralogy, transposition, truncus, tricuspid atresia, TAPVR.
Acyanotic congenital heart disease usually causes left-to-right shunt or obstruction without early cyanosis, such as VSD, ASD, PDA, coarctation, or aortic stenosis.
Hyperoxia test with PaO2 remaining below about 100 on 100% oxygen supports cyanotic heart disease; PGE1 maintains ductus in ductal-dependent lesions.
Acyanotic lesions usually cause left-to-right shunt or obstruction without early cyanosis; neonatal critical coarctation can become ductal-dependent when the ductus closes.
The repair move
Before naming the answer, force the stem through the separator: Cyanotic disease has right-to-left shunt/desaturation; acyanotic disease is left-to-right or obstructive without early blue color.
Try a free question
CoreA 1-week-old neonate develops cyanosis with feeding and crying. Pulse oximetry shows oxygen saturation of 78%. After 100% oxygen administration for 10 minutes (hyperoxia test), PaO2 only rises to 60 mmHg (normal would be >150). Echocardiography shows transposition of the great arteries. Which type of congenital heart disease is this?
Show answer and explanation
Answer: A. CYANOTIC congenital heart disease. Cyanotic CHD features right-to-left shunt with mixing of deoxygenated and oxygenated blood. Fixed desaturation that does NOT correct with oxygen administration (hyperoxia test negative). The 5 Ts: Truncus arteriosus, Transposition of great arteries, Tricuspid atresia, Tetralogy of Fallot, Total anomalous pulmonary venous return. Some are ductal-dependent: PGE1 keeps ductus open until surgical correction.
Why the other choices are tempting
- B. Acyanotic L-to-R shunts (VSD, ASD, PDA) cause CHF symptoms but not early cyanosis.
- C. Acyanotic obstructive lesions (coarctation, AS) cause differential cyanosis or shock.
- D. Pulmonary disease would correct with oxygen.
- E. Methemoglobinemia has chocolate-brown blood and may not correct with oxygen.
Flashcards
Tap a card to flip it.
What clue supports Cyanotic congenital heart disease?
Choose Cyanotic congenital heart disease when the stem gives this pattern: Cyanotic congenital heart disease causes right-to-left shunting, low oxygen saturation, blue discoloration, and examples like tetralogy, transposition, truncus, tricuspid atresia, TAPVR.
What clue supports Acyanotic congenital heart disease?
Choose Acyanotic congenital heart disease when the stem gives this contrasting pattern: Acyanotic congenital heart disease usually causes left-to-right shunt or obstruction without early cyanosis, such as VSD, ASD, PDA, coarctation, or aortic stenosis.
Quick answers
What is the fastest way to tell Cyanotic congenital heart disease from Acyanotic congenital heart disease?
Cyanotic disease has right-to-left shunt/desaturation; acyanotic disease is left-to-right or obstructive without early blue color.
What is the key clue for Cyanotic congenital heart disease?
Cyanotic congenital heart disease causes right-to-left shunting with low oxygen saturation; the 5 Ts include tetralogy, transposition, truncus arteriosus, tricuspid atresia, and TAPVR.
What is the key clue for Acyanotic congenital heart disease?
Acyanotic congenital heart disease usually causes left-to-right shunt or obstruction without early cyanosis, such as VSD, ASD, PDA, coarctation, or aortic stenosis.