右心室起搏与双心腔起搏术对Ⅲ度房室传导阻滞老年患者的临床疗效比较
우심실기박여쌍심강기박술대Ⅲ도방실전도조체노년환자적림상료효비교
A comparative study of the clinical efficacy of VVI pacing and DDD pacing in old patients with Ⅲ° atrioventricular block
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