Look at the rhythm strip in lead V1 and you will intermittently see P waves prior the QRS complexes. March them out to see even more that are consistent. Also, the R-S is about exactly 100 ms in ...

The rhythm starts as normal sinus rhythm with a ... This is not obvious on the 12-lead ECG tracing, although the heart rate during the tachycardia is almost exactly 150 beats per minute which ...