Title :
Similar heart rates, different QT-intervals
Author :
Levert, Jeroen V. ; Swenne, Cees A. ; Maan, Arie C. ; Schalij, Martin J. ; Viergever, Eric P. ; Frederiks, Joost ; Pfeiffer, Carolline A H ; Bruschke, A.V.G.
Author_Institution :
Dept. of Cardiology, Leiden Univ. Hospital, Netherlands
Abstract :
The authors hypothesized that the QT-interval depends not only on rate, but also on autonomic influences. To study this, the authors compared QT-intervals within 14 healthy subjects (7 male/7 female, ages 26.0/spl plusmn/3.1 years), at equal heart rates during handgrip and during head-up tilt. QT- and QTc-intervals during handgrip were significantly larger than during tilt (QT: 403/spl plusmn/24 vs. 394/spl plusmn/25 ms; QTc: 436/spl plusmn/16 vs. 426/spl plusmn/15 ms). This finding demonstrates that rate alone is not sufficient to interpret the QT-interval.
Keywords :
electrocardiography; medical signal processing; neurophysiology; 26.0 y; 394 to 436 ms; ECG analysis; QT-interval; autonomic influences; electrodiagnostics; handgrip; head-up tilt; healthy subjects; heart rate; Arterial blood pressure; Baroreflex; Cardiology; Equations; Heart rate; Hospitals; Medical diagnostic imaging; Myocardium; Protocols; Sympathetic nervous system;
Conference_Titel :
Computers in Cardiology, 1996
Conference_Location :
Indianapolis, IN, USA
Print_ISBN :
0-7803-3710-7
DOI :
10.1109/CIC.1996.542527
