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  #1  
Old 10-12-2011
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Stethoscope Single Second Heart Sound S2

While auscultation of a baby with congenital heart disease, you noticed single S2, which of the following is NOT among your differential?
1. TOF.
2. TGA.
3. Tricuspid Atresia.
4. Truncus arteriosus.
5. Patent Ductus arteriosus.
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Old 10-12-2011
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confused between truncusarteriosus and pda..but i thinkit is pda which has no single s2 ..just a machinery murmur..so no s1 n s2 heard...apart from the ones listed..add to the list pul atresia
@ag2011n......great question though..please post more paediatric question
good revision
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Old 10-12-2011
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TGA - blind guess
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Old 10-12-2011
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it's > 5. Patent Ductus arteriosus
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Old 10-13-2011
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The correct answer: 5. Patent Ductus arteriosus.
Which is the only one has nothing to do with the abnormalities of the pulmonary valve.
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Old 06-28-2013
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the answer is transposition of great arteries.
causes of single s2 are those with absence or inaudibilty of either components and those which delay a2 such that a2 and p2 occur together or are separated by time duration less than 20millisecond which is heard by our ears as one sound.

i am sure its a doubt between pda and tga for most of us.
remember that a2 can be delayed in pda and most of us remember it as a cause of reverse splitting.but initially it would cause single s2 before reverse split.
tga has got nothing to do with valve closure timing!
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Old 06-28-2013
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do u think like this wtf questions will be in step 1
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Old 07-19-2013
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Quote:
Originally Posted by ag2011n View Post
While auscultation of a baby with congenital heart disease, you noticed single S2, which of the following is NOT among your differential?
1. TOF.
2. TGA.
3. Tricuspid Atresia.
4. Truncus arteriosus.
5. Patent Ductus arteriosus.
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