Right ventricular pressure, dP/dt, and preejection interval during tilt induced vasovagal syncope.
This study examined the potential utility of monitoring right ventricular dP/dt as a means of detecting imminent vasovagal syncope. To assess this possibility, continuous right ventricular pressure measurements were recorded in nine patients during induction of syncope by head-up tilt testing. Findings indicated that arterial pressure tended to fall prior to drop in heart rate. RV pressure exhibited a significant, but very small, fall during tilt. DP/dt max increased by 15-20% during tilt, then fell by a median of 30% from maximum value beginning about 2 minutes prior to syncope. Thus, further investigation of dP/dt as a potential marker of impending vasovagal syncope is warranted.
Petersen
M E
ME
Chelsea and Westminster Hospital, London, United Kingdom.
Williams
T R
TR
Erickson
M
M
Sutton
R
R
D000328:Adult; D001794:Blood Pressure / Q000502:physiology; D001919:Bradycardia / Q000503:physiopathology; D005260:Female; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D007022:Hypotension / Q000503:physiopathology; D007091:Image Processing, Computer-Assisted; D008297:Male; D009200:Myocardial Contraction / Q000502:physiology*; D019462:Syncope, Vasovagal / Q000175:diagnosis / Q000503:physiopathology*; D013599:Systole / Q000502:physiology; D018667:Tilt-Table Test; D016278:Ventricular Function, Right; D017725:Ventricular Pressure / Q000502:physiology*; D014743:Videotape Recording