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Autonomic modulation of the atrial cycle length by the head up tilt test: non-invasive evaluation in patients with chronic atrial fibrillation

Ingemansson, Max LU ; Holm, Magnus and Olsson, Bertil LU (1998) In Heart 80(1). p.71-76
Abstract
OBJECTIVE: To determine the effects of upright posture compared with supine position on the dominant atrial cycle length (DACL) in patients with chronic atrial fibrillation. DESIGN: The power/frequency spectrum of QRST suppressed lead V1 ECG was studied in 14 patients in the supine position and during the head up tilt table test. The DACL changes were compared with changes in heart rate and blood pressure. RESULTS: Compared with the supine position, the upright position reduced the DACL from 160 to 150 ms (p < 0.01). The DACL was increased after returning to the supine position from the upright position, from 147 to 154 ms (p < 0.01). Heart rate increased from 91 beats/min in the supine position to 106 in the upright position (p <... (More)
OBJECTIVE: To determine the effects of upright posture compared with supine position on the dominant atrial cycle length (DACL) in patients with chronic atrial fibrillation. DESIGN: The power/frequency spectrum of QRST suppressed lead V1 ECG was studied in 14 patients in the supine position and during the head up tilt table test. The DACL changes were compared with changes in heart rate and blood pressure. RESULTS: Compared with the supine position, the upright position reduced the DACL from 160 to 150 ms (p < 0.01). The DACL was increased after returning to the supine position from the upright position, from 147 to 154 ms (p < 0.01). Heart rate increased from 91 beats/min in the supine position to 106 in the upright position (p < 0.01). There was a decrease in heart rate from 109 beats/min in the upright position to 93 after returning to the supine position (p < 0.01). No significant changes were seen in systolic or diastolic blood pressure. There were indications of an inverse relation between DACL and heart rate when comparing the supine position before and after tilt with the upright position (p < 0.001). CONCLUSIONS: The sympathetic stimulation and vagal withdrawal induced by rising to upright body position are associated with a decrease in DACL during chronic atrial fibrillation. Thus a reflex increase in sympathetic discharge after induction of atrial fibrillation could favour the persistence of the arrhythmia. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
atrial cycle length, atrial fibrillation, autonomic nervous system, heart rate
in
Heart
volume
80
issue
1
pages
71 - 76
publisher
BMJ Publishing Group
external identifiers
  • pmid:9764064
  • scopus:0031875363
ISSN
1355-6037
language
English
LU publication?
yes
id
bb93cbb3-29b0-4810-a616-eb4c08f1dd4d (old id 1114028)
alternative location
http://heart.bmj.com/cgi/content/full/80/1/71
date added to LUP
2008-07-16 15:23:57
date last changed
2017-03-19 03:23:34
@article{bb93cbb3-29b0-4810-a616-eb4c08f1dd4d,
  abstract     = {OBJECTIVE: To determine the effects of upright posture compared with supine position on the dominant atrial cycle length (DACL) in patients with chronic atrial fibrillation. DESIGN: The power/frequency spectrum of QRST suppressed lead V1 ECG was studied in 14 patients in the supine position and during the head up tilt table test. The DACL changes were compared with changes in heart rate and blood pressure. RESULTS: Compared with the supine position, the upright position reduced the DACL from 160 to 150 ms (p &lt; 0.01). The DACL was increased after returning to the supine position from the upright position, from 147 to 154 ms (p &lt; 0.01). Heart rate increased from 91 beats/min in the supine position to 106 in the upright position (p &lt; 0.01). There was a decrease in heart rate from 109 beats/min in the upright position to 93 after returning to the supine position (p &lt; 0.01). No significant changes were seen in systolic or diastolic blood pressure. There were indications of an inverse relation between DACL and heart rate when comparing the supine position before and after tilt with the upright position (p &lt; 0.001). CONCLUSIONS: The sympathetic stimulation and vagal withdrawal induced by rising to upright body position are associated with a decrease in DACL during chronic atrial fibrillation. Thus a reflex increase in sympathetic discharge after induction of atrial fibrillation could favour the persistence of the arrhythmia.},
  author       = {Ingemansson, Max and Holm, Magnus and Olsson, Bertil},
  issn         = {1355-6037},
  keyword      = {atrial cycle length,atrial fibrillation,autonomic nervous system,heart rate},
  language     = {eng},
  number       = {1},
  pages        = {71--76},
  publisher    = {BMJ Publishing Group},
  series       = {Heart},
  title        = {Autonomic modulation of the atrial cycle length by the head up tilt test: non-invasive evaluation in patients with chronic atrial fibrillation},
  volume       = {80},
  year         = {1998},
}