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Rabbit-ear sign

jer5150's picture

Jason's Blog: ECG Challenge of the Week for Dec. 23rd - 30th.

I performed this ECG earlier this year in an outpatient clinic.

Patient's clinical data:  85-year-old white man; asymptomatic. 

Questions?
(1.)  What rhythm is this tracing showing?
(2.)  What clue/sign is used to differentiate between the two anomalous beats (i.e., 4th and 6th beats).  HINT:  It's named after a part of a certain animal's anatomy.

** *** NOTE *** **:  For the sake of determining QRS morphology and axis, I've also included a simultaneous single-channel rhythm strip of Lead I directly below the 12-lead ECG. 

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