TY - JOUR
T1 - Maximal Rate of Tachycardia Development
T2 - Sinus Tachycardia with Sudden Exercise vs. Spontaneous Ventricular Tachycardia
AU - FISHER, JOHN D.
AU - GOLDSTEIN, MARK
AU - OSTROW, ELIOT
AU - MATOS, JEFFREY A.
AU - KIM, SOO G.
PY - 1983/3
Y1 - 1983/3
N2 - In addition to providing basic physiologic information, knowledge of the maximal rate of sinus tachycardia development may be helpful in developing algorithms permitting new generations of antitachycardia pacemakers to distinguish accurately between sinus and ventricular tachycardia. To determine the maximal rate of sinus tachycardia development, 50 normal subjects rushed up 100 stairs as rapidly as possible, with continuous electrocardiographic monitoring. During the first second of exercise, the mean cardiac cycle length shortened from 709 to 570 ms, equivalent to an increase in heart rate from 85 to 105 beats per minute, or 20 beats per minute per second. Thereafter, a more gradual decrease in cycle length occurred. Differences between men and women, smokers and non‐smokers, and sedentary compared to active subjects were all insignificant. Analysis of 50 spontaneous episodes of ventricular tachycardia also revealed a sequential but more abrupt decrease in the cycle length during the first second from 757 to 360 ms, equivalent to a rate increase from 79 to 167 beats per minute, or 88 beats per minute per second. After approximately 1 1/4 seconds, the ventricular tachycardia cycle length remained virtually constant. Baseline cycle lengths were similar in the sinus and ventricular tachycardia groups, but differed in all subsequent beats, although overlap for individual subjects did occur.
AB - In addition to providing basic physiologic information, knowledge of the maximal rate of sinus tachycardia development may be helpful in developing algorithms permitting new generations of antitachycardia pacemakers to distinguish accurately between sinus and ventricular tachycardia. To determine the maximal rate of sinus tachycardia development, 50 normal subjects rushed up 100 stairs as rapidly as possible, with continuous electrocardiographic monitoring. During the first second of exercise, the mean cardiac cycle length shortened from 709 to 570 ms, equivalent to an increase in heart rate from 85 to 105 beats per minute, or 20 beats per minute per second. Thereafter, a more gradual decrease in cycle length occurred. Differences between men and women, smokers and non‐smokers, and sedentary compared to active subjects were all insignificant. Analysis of 50 spontaneous episodes of ventricular tachycardia also revealed a sequential but more abrupt decrease in the cycle length during the first second from 757 to 360 ms, equivalent to a rate increase from 79 to 167 beats per minute, or 88 beats per minute per second. After approximately 1 1/4 seconds, the ventricular tachycardia cycle length remained virtually constant. Baseline cycle lengths were similar in the sinus and ventricular tachycardia groups, but differed in all subsequent beats, although overlap for individual subjects did occur.
KW - antitachycardia pacemakers
KW - exercise testing
KW - sinus tachycardia
KW - ventricular tachycardia
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U2 - 10.1111/j.1540-8159.1983.tb04349.x
DO - 10.1111/j.1540-8159.1983.tb04349.x
M3 - Article
C2 - 6189060
AN - SCOPUS:0020539088
SN - 0147-8389
VL - 6
SP - 221
EP - 228
JO - Pacing and Clinical Electrophysiology
JF - Pacing and Clinical Electrophysiology
IS - 2
ER -