The diagnostic significance of real sinus node automaticity depression in symptomatic sinus bradycardia.

摘要: Atrial overdrive pacing was performed, before and after autonomic blockade, in 42 consecutive patients (32 males 10 females, mean age 46 +/- 11 years) with symptomatic sinus bradycardia. Patients were divided into two groups: Group I, 23 (mean 43 8 normal intrinsic heart rate (IHR) corrected node recovery time (intrinsic CSNRT 425 ms). In addition to cycle length, IHR, maximal sinoatrial conduction (SACT) the real automaticity depression (SAD) also evaluated, calculated blockade CSNRT-SACT). Not all an abnormal IHR showed abnormally prolonged not had CSNRT. Among I (normal IHR) 19 SAD 300 ms. The value of (> ms) observed only and/or but several increases sensitivity testing may allow detect even latent organic dysfunction. conclusion, a synopsis SACT be useful estimate more accurately degree impairment helping differentiate dysfunction from one.