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.
This shares some similarities with previous ECGs that I've posted but this time there is an extra twist.
Is this really what it appears to be? Well, . . . yes and no. It depends on whether you're referring to how it manifests electrocardiographically on the surface tracing OR electrophysiologically on a cellular level. Don't make the mistake of rushing to make a hasty judgement and be sure to pay attention to subtle detail. As usual, a heavily detailed laddergram will reveal all!