Tuesday, December 21, 2010

Another SVT mimic

I recently mentioned 1:2 AV conduction. Here's another one: interpolated junctional extrasystoles. The authors considered 1:2 conduction in each case but it turned out to be junctional firing interpolated between sinus beats, leaving the sinus mechanism undisturbed, behaving as a parasystolic focus. An abrupt, exact doubling of the ventricular rate provides a clue.

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