Patient data: 64-year old man who, prior to this ECG, had been in normal sinus rhythm. Whatever your level of sophistication in rhythm interpretation (i.e., basic, intermediate, or advanced), this ECG has a little bit of something for everybody. Basic interpreters will undoubtedly recognize the dominant disturbance of rhythm. Intermediate interpreters will probably add more descriptors to their interpretation that will better describe the overall pattern. Advanced interpreters will recognize the
Patient's clinical data: 47-year-old black man. Another serial ECG (seen below) showed a supraventricular tachycardia (SVT) at a rate of 164/min that was diagnosed by an Electrophysiologist as atrioventricular nodal reentrant tachycardia (AVNRT). How does knowing the mechanism of AVNRT help you in determining the nature of the mechanism in this week's ECG.