The first to systematically approach the heart from an electrical point-of-view wasAugustus Waller, working in St Mary's Hospital in Paddington, London.
The stage setting imitated an operating room, and an ECG Monitor or an anatomical model of the human body, etc. were arranged on the stage, and the synthesizer and the drum set were laid on operating tables.
a variation in the P wave, R wave, or T wave in an echocardiogram in which a wave which usually has a single peak instead has two separate peaks
Reverse Design = "Medical Innovation"; Discovery of insulin to treat diabetes; DNA strand; ECG (electrocardiogram)
PMID 8522703 - American College of Cardiology Expert Consensus Document (1996): Signal-averaged Electrocardiography, J Am Coll Cardiol.
This form is identical to the type of AV block described by Hay in 1906 without the benefit of electrocardiography.