Concealed ventricular hexageminy.
The authors report a case of concealed ventricular hexageminy in which, with a few exceptions, extrasystoles were separated by sinus beats conforming to the formula 6n - 1. Whenever an exception to this formula occurs, the intervening beats are not all of sinus origin, but include also a ventricular extrasystole that is different from those occurring in hexageminal distribution. The pattern is explained by a parasystolic rhythm modulated by sinus impulses, assuming a 3:1 ratio between the parasystolic cycle and the sinus cycle. Such a ratio would have to be associated with a trigeminal or concealed trigeminal distribution. There is, however, a 2:1 ectopic-ventricular block, leading to a change of the ectopic distributional pattern from the expected concealed trigeminy to that of the concealed hesageminy.
Satullo
G
G
Istituto Pluridisciplinare di Clinica Medica e Terapia Generale e Speciale, Universita' di Messina, Italy.
Oreto
G
G
Luzza
F
F
Saporito
F
F
Consolo
F
F
Schamroth
L
L
D000368:Aged; D005117:Cardiac Complexes, Premature / Q000503:physiopathology*; D002304:Cardiac Pacing, Artificial; D004562:Electrocardiography; D004582:Electronics, Medical; D006352:Heart Ventricles; D006801:Humans; D008297:Male