美国研究者发现：就埋藏式心脏转复除颤器（ICD）而言，无论采用双腔频率应答（DDDR）加房室搜索滞（ASH）后的模式设计还是采用单腔心室（I）模式，其临床结果类似。
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窦房结的这种特性可能是单传感器频率应答性起搏器不能完全符合生理需要的基本原因。
This is the reason why the rate responsive pacemaker by one sensor is not suitable for the physiologic demand completely.
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。
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).
您需要了解大小、持久性、优先级和频率分布，还要能够使数据流中的消息关系相互关联起来，例如将请求与应答进行匹配。
You need to know sizes, persistence, priority, and frequency distribution, plus have the ability to correlate message affiliations within the data stream, such as matching requests to replies.
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