Format

Send to

Choose Destination
Can J Cardiol. 2003 May;19(6):698-700.

Paced breathing can prevent vasovagal syncope during head-up tilt testing.

Author information

1
Unidad de Investigación Médica, HG Centro Médico Nacional La Raza IMSS, Mexico City, Mexico.

Abstract

BACKGROUND:

Clinical experience suggests that, through the control of heart rate, paced breathing may prevent syncope.

OBJECTIVE:

To assess the effect of metronome-paced breathing (0.2 Hz) on the outcome of head-up tilt test (HUT) in patients with vasovagal syncope.

PATIENTS AND METHODS:

Ten patients (two men), mean +/- SD age 18.4 +/- 5.1 years, with a positive HUT with spontaneous breathing and no evidence of cardiovascular or neurological disease, were exposed to a second HUT under metronome-paced breathing (0.2 Hz). Continuous electrocardiographic recordings were obtained during the two tests, and heart rate variability was analyzed off-line.

RESULTS:

During HUT with metronome-paced breathing, only one of the 10 patients developed bradycardia, hypotension and syncope (P<0.01, Wilcoxon). Compared with HUT with spontaneous breathing, HUT with paced breathing induced a larger increase in the heart rate in the first minute of tilt (4 +/- 6 beats/min versus 16 +/- 12 beats/min, P<0.05).

CONCLUSIONS:

The results show that paced breathing can prevent vasovagal syncope induced by HUT. This finding suggests that respiratory training could be useful to prevent vasovagal syncope.

PMID:
12772021
[Indexed for MEDLINE]

Supplemental Content

Loading ...
Support Center