Answer - Case of the month (Jul 2011)

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Q: A narrow complex tachycardia. What is the most likely diagnosis?

A. Atrial tachycardia

B. Counter clockwise atrial flutter (cavotricuspid isthmus dependant counterclockwise macro-reentry tachycardia) with 2:1 and 3:1 AV conduction

C. Counter clockwise atrial flutter (cavotricuspid isthmus dependant counterclockwise macro-reentry tachycardia) with 3:1 and 4:1 AV conduction

D. Clockwise atrial flutter (cavotricuspid ishtmus dependant clockwise macro-reentry tachycardia)

Answer:

D. Clockwise atrial flutter (cavotricuspid ishtmus dependant clockwise macro-reentry tachycardia)

More information:

http://en.ecgpedia.org/wiki/Atrial_Flutter

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