P: the neglected deflection.
Spodick
D H
DH
D002306:Cardiac Volume / Q000502:physiology; D004562:Electrocardiography / Q000379:methods* / Q000592:standards; D006325:Heart Atria / Q000473:pathology; D006327:Heart Block / Q000175:diagnosis*; D006801:Humans; D011379:Prognosis