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Is it unusual to have two different rhythms in a 12 second EKG?

Is it unusual to have two different rhythms in a 12 second EKG?  The last couple EKG's I've had come back as sinus and junctional rhythm...Was wondering how often two unique rhythms occur in just 12 seconds?  The EP didn't seem too concerned as he said I don't even need to see him anymore for follow-ups unless there is some change...Moreover, I've had two normal echo studies and one cardiac MRI which was normal so there appears to be no structural issue.  Thanks.

submitted by Richard from Pennsylvania on 7/23/2013


by Texas Heart Institute cardiologist, J. Alberto Lopez, MD  

J. Alberto Lopez, MD I agree. In a healthy fit individual with high vagal tone, it is not unusual to see a slow sinus rhythm competing with a junctional escape rhythm. No treatment is necessary if the sinus node (native pacemaker of the heart) responds normally to an increase in activity.

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Updated July 2013
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