Methods:156 patients (male 87, female 69, average age of 55?7 years) were operated and VVI pacing, AAI pacing and DDD pacing were respectively implanted into 147 patients, 8 patients and one patient.

• 方法：156例患者，男性87例，女性69例，平均年龄55?7岁。 植入VVI147例，AAI8例，DDD1例。