The physiologic benefit of permanent cardiac pacemaker therapy for refractory asoagal syncope is probably small, cardiologists from Canada conclude based on results of a systemic reiew and meta-analysis of nine randomized trials.

• 永久心脏起搏器治疗难治性晕厥的生理学益处可能很小，加拿大的心脏学家总结了全身检查和汇总分析九个随基实验组的结果。