The effect of head-upright tilt table testing for vasovagal syncope on P-wave duration.
Fluid shifts in vasovagal syncope may be reflected in electrocardiographic P-wave duration. We examined the effect of head-upright tilt-table testing (HUT) on P-wave duration among patients with positive or negative HUT. P-wave duration was measured at baseline and several post-HUT time points. In patients with a positive HUT, the test was immediately discontinued. P-wave duration measurements obtained at the completion of the test or when symptoms occurred were compared to baseline measurements. The P-wave duration among patients with a positive HUT was significantly reduced at the onset of symptoms as compared to baseline (-14.0 ms, P = .0054) and 2-minute tilt measurements (-11.3 ms, P = .0246). P-wave duration measurements were not reduced in patients experiencing a negative HUT at any follow-up time. We showed a significant reduction in P-wave duration among patients experiencing positive HUT that suggests a dynamic relationship between atrial volume and P-wave duration.
Haider
Jawad
J
Hartford Hospital Division of Cardiology and Drug Information Center, Hartford, CT 06102, USA.
Kalus
James S
JS
White
C Michael
CM
Narula
Dhiraj D
DD
Guertin
Danette C
DC
Caron
Michael F
MF
Kluger
Jeffrey
J
D000328:Adult; D000368:Aged; D004562:Electrocardiography; D005260:Female; D006329:Heart Conduction System / Q000473:pathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D019462:Syncope, Vasovagal / Q000175:diagnosis* / Q000473:pathology; D018667:Tilt-Table Test; D013997:Time Factors