Background The efficacy of permanent cardiac pacing in patientswith neurocardiogenic (or vasovagal) syncope associated withbradycardia or asystole is not clear. We compared the efficacyof cardiac pacing with that of oral drug therapy in the preventionof hypotension and syncope during head-up tilt testing.
Methods Among 70 patients with a history of syncope in whomhypotension and syncope could be provoked during head-up tilttesting, 22 had bradycardia (a heart rate <60 beats per minute,with a decline in the rate by at least 20 beats per minute)or asystole along with hypotension during testing. There were9 men and 13 women, with a mean (±SD) age of 41 ±17years. Head-up tilt testing was repeated during atrioventricularsequential pacing (in 20 patients with sinus rhythm) or ventricularpacing (in 2 patients with atrial fibrillation). Regardlessof the results obtained during artificial pacing, all the patientssubsequently had upright-tilt testing repeated during therapywith oral metroprolol, theophylline, or disopyramide.
Results During the initial tilt test, 6 patients had asystoleand 16 had bradycardia along with hypotension. Despite artificialpacing, the mean arterial pressure during head-up tilt testingstill fell significantly, from 97 ±19 to 57 ±19mm Hg (P<0.001); 5 patients had syncope, and 15 had presyncope.By contrast, 19 patients who later received only medical therapy(metoprolol in 10, theophylline in 3, and disopyramide in 6),2 patients who received both metoprolol and atrioventricularsequential pacing, and 1 patient who received only atrioventricularsequential pacing had negative head-up tilt tests. After a medianfollow-up of 16 months, 18 of the 19 patients who were treatedwith drugs alone (94 percent) remained free of recurrent syncopeor presyncope, whereas the patient treated only with a permanentdual-chamber pacemaker had recurrent syncope.
Conclusions In patients with neurocardiogenic syncope associatedwith bradycardia or asystole, drug therapy is often effectivein preventing syncope, whereas artificial pacing is not.
Source Information
Presented in part at the 64th Annual Scientific Sessions of the American Heart Association, November 11-14, 1991.
From the Sinai Samaritan Medical Center, 945 N. 12th St., Milwaukee, WI 53233, where reprint requests should be addressed to Dr. Sra.
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