The Bix Rule

A term was coined called the "Bix Rule", in honor of a Viennese cardiologist who had an encyclopedic knowledge of arrhythmia, which states that if you are dealing with a supraventricular tachycardia, in which visible P wave is situated midway between ventricular complexes, there is a probability that there is a P wave lurking within the QRS complexes. Thus, there can be an atrial tachycardia or atrial flutter with 2:1 AV conduction.

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