Dissociation of heart rate and ECG morphology

Author

Frederiks, J. ; Sweene, CA ; Maan, AC ; Kors, JA ; van Herpen, G. ; Levert, JV ; Schalij, Mj ; Bruschke, AVG

Author_Institution

Dept. of Cardiology, Leiden Univ., Netherlands

fYear

1998

fDate

13-16 Sep 1998

Firstpage

409

Lastpage

412

Abstract

The authors studied thirteen healthy subjects in which identical heart rates (ΔHR<1%) could be obtained under different autonomous conditions: by increasing the angle of the legs with the horizontal plane, with tilt angles ranging from 0 till 60° and back, or by performing a handgrip maneuver. During all measurements the thorax was kept at a 700 angle. Heart rate increased from 65.2a±9.0 (control) to 72.1±8. 7 (tilt) and 72.1±8.8 (handgrip) bpm. A number of vector cardiographic parameters differed significantly (P<0.05) between tilt and handgrip, e.g. QRS azimuth (-33.5±15.0 vs. -22.4±22.5°), QRS duration (103±10 vs. 107±13 ms), maximal T vector (646±200 vs. 703±184 μV), T azimuth (45.3±14.5 vs. 38.6±13.6°) and the heart rate corrected QT interval (418±15 vs. 435±21 ms). This study demonstrates that tilt and handgrip dissociate heart rate and ventricular depolarization and repolarization

Keywords

biomechanics; electrocardiography; medical signal processing; 103 ms; 107 ms; 418 ms; 435 ms; 646 muV; 703 muV; ECG morphology; QRS azimuth; QRS duration; T azimuth; autonomous conditions; corrected QT interval; handgrip maneuver; healthy subjects; heart rate; horizontal plane; leg angle; thorax; tilt angles; vector cardiographic parameters; ventricular depolarization; ventricular repolarization; Azimuth; Cardiology; Electrocardiography; Fingers; Heart rate; Heart rate interval; Morphology; Myocardium; Sampling methods; Temperature;

fLanguage

English

Publisher

ieee

Conference_Titel

Computers in Cardiology 1998

Conference_Location

Cleveland, OH

ISSN

0276-6547

Print_ISBN

0-7803-5200-9

Type

conf

DOI

10.1109/CIC.1998.731889

Filename

731889