TY - JOUR
T1 - Symmetry, broken symmetry, and restored symmetry of apparent pure ventricular parasystole
AU - Castellanos, Agustin
AU - Fernandez, Pedro
AU - Moleiro, Federico
AU - Interian, Alberto
AU - Myerburg, Robert J.
N1 - Funding Information:
From the Division of Cardiology, Department of Medicine, University of Miami School of Medicine, P.O. Box 016960, Miami, Florida 33101. This study was supported in part by research grant HL-28 130 from the National Heart, Lung, and Blood Institute, Bethesda, Maryland. Manuscript received January 28, 1991; revised manuscript received March 15,1991, and accepted March 18.
PY - 1991/7/15
Y1 - 1991/7/15
N2 - Previous reports dealing with the dynamics of "pure" parasystole using mathematic and electronic (pacing-induced) models, respectively, showed that a number of predictions emerged naturally from mathematic analysis.1,2 Therefore, it appeared of interest to determine whether they would also apply to a series of patients with clinical (apparently) "pure" ventricular parasystole who were monitored for relatively long periods of time. In contrast to previous studies, Glass et al1 had the ingenious idea of analyzing the number of sinus beats interposed between 2 consecutive manifest parasytolic beats. They observed that, with the rates being practically constant, a detailed mathematic description could be made using 2 parameters: the ratio of ectopic cycle length to sinus cycle length and the ratio of ventricular refractory period to sinus cycle length. From a correlation of these parameters 3 basic rules emerged: (1) There are at most 3 different values for the number of sinus beats in between parasystolic beats. (2) Only 1 of these values is odd. (3) The sum of the 2 lesser values is 1 less than the larger value.
AB - Previous reports dealing with the dynamics of "pure" parasystole using mathematic and electronic (pacing-induced) models, respectively, showed that a number of predictions emerged naturally from mathematic analysis.1,2 Therefore, it appeared of interest to determine whether they would also apply to a series of patients with clinical (apparently) "pure" ventricular parasystole who were monitored for relatively long periods of time. In contrast to previous studies, Glass et al1 had the ingenious idea of analyzing the number of sinus beats interposed between 2 consecutive manifest parasytolic beats. They observed that, with the rates being practically constant, a detailed mathematic description could be made using 2 parameters: the ratio of ectopic cycle length to sinus cycle length and the ratio of ventricular refractory period to sinus cycle length. From a correlation of these parameters 3 basic rules emerged: (1) There are at most 3 different values for the number of sinus beats in between parasystolic beats. (2) Only 1 of these values is odd. (3) The sum of the 2 lesser values is 1 less than the larger value.
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U2 - 10.1016/0002-9149(91)90756-B
DO - 10.1016/0002-9149(91)90756-B
M3 - Article
C2 - 2063792
AN - SCOPUS:0025894772
VL - 68
SP - 256
EP - 259
JO - American Journal of Cardiology
JF - American Journal of Cardiology
SN - 0002-9149
IS - 2
ER -