The part of AV-node variability in total heart rate variability evaluated by fixed rate atrial pacing

Author

Tegethoff, K. ; Baumert, J.-H. ; Frey, A.W. ; Adt, M.

Author_Institution

Inst. fur Anaesthesie, eutsches Herzzentrum Berlin, Germany

fYear

1994

fDate

25-28 Sept. 1994

Firstpage

313

Lastpage

315

Abstract

In thirteen patients with coronary artery bypass graft surgery, heart rate variability (HRV) was investigated shortly after arrival in an intensive care unit. Recordings were made under 3 different conditions: sinus rhythm (SR), and fixed rate atrial pacing with increases in heart rate of 25% (p1) and 50% (p2). When using a fixed rate atrial pacemaker there was still a determinable HRV discernible from noise. HRV decreased in both pacing conditions inversely to heart rate (p<0.05). Parasympathetic influence increased from SR to p1 (p<0.005) with no more increase to p2. The extent of the reduction of variability was comparable to the variability after cardiac transplantation. Local circuits, mechanical effects and the influence of the autonomic nervous system on the atrioventricular conduction may explain these findings.<>

Keywords

cardiology; medical signal processing; neurophysiology; pacemakers; atrioventricular conduction; autonomic nervous system; cardiac transplantation; coronary artery bypass graft surgery patients; fixed rate atrial pacing; intensive care unit; mechanical effects; parasympathetic influence; sinus rhythm; total heart rate variability; Autonomic nervous system; Cardiology; Frequency; Hafnium; Heart rate; Heart rate variability; Pacemakers; Spectral analysis; Strontium; Surgery;

fLanguage

English

Publisher

ieee

Conference_Titel

Computers in Cardiology 1994

Conference_Location

Bethesda, MD, USA

Print_ISBN

0-8186-6570-X

Type

conf

DOI

10.1109/CIC.1994.470186

Filename

470186