Objective: To observe the clinical effect and evaluate the exercise tolerance in sick sinus symptom patients with angina pectoris after implanting rate responsive pacemaker (DDDR).

目的：观察合并冠心病心绞痛的病态窦房结综合征患者置入频率应答起搏器（DDDR）的临床疗效及运动耐量评价。

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Buying and implanting a pacemaker costs from five thousand to fifteen thousand dollars.

VOA: special.2010.06.02