Synchronized and desynchronized sinus node activity.

In certain cases because of sinus arrhythmia and/or anarchic return and postreturn cycles caused by premature atrial stimulation, the sinoatrial conduction time cannot be calculated since a chaotic postextrasystolic pattern appears. We examined 49 patients with a history and ECG signs suggesting sinus node dysfunction by programmed extrastimulation method as proposed by Strauss et al. prior to and after pharmacologic autonomic blockade (with propranolol 0.

Part of the autonomous nervous system in the development of chaotic post-extrasystolic pictures. Electrophysiological and pharmacological studies of 49 cases.

The interpretation of post-extrasystolic parameters and their significance is discussed. Programmed extrastimulation according to Strauss was carried out in 49 cases, before and after atropine and propranolol administration. The result was a computable sinoauricular conduction time (SACT), a chaotic picture, or an ascending line without plateau.

[Sinus node dysfunction. Clinical outcome and results of cardiac pacing].

112 patients (average age 66 +/- 13 years) with sinus node dysfunction, selected on clinical, electrocardiographic and electrophysiological criteria, were followed up for a period of 3 to 55 months (average: 30,2 months). Permanent cardiac pacing was instituted in 59 patients (52,6 p. 100), and the remaining patients treated medically.

[Syncope and transient neurologic deficits of undetermined origin. Clinical and electrophysiological correlations].

A consecutive series of 140 patients who presented either with syncope or transient neurological deficit of undertermined cause underwent electrophysiological investigation. The patients were classified in 3 groups: Group I comprising 55 patients having presented "true syncope"; Group II comprising 42 patients with "false vertigo"; and Group III comprising 43 patients in whom a transient neurological deficit had been observed. Globally, the investigations were positive in 58 patients (41,4%).