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体位性心动过速综合征是一种与体位有明确关系的窦性心动过速,特征性临床表现为当患者体位由平卧位转为直立时,于10 min内心率增加≥30次.min-1,或心率最大值≥120次.min-1。体位性心动过速的发病机制目前尚未明了,可能主要与中心血容量改变、自主神经及肌肉泵功能障碍、血管内皮功能异常以及基因变异等有关。
Orthodontic tachycardia syndrome is a sinus tachycardia that has a clear relationship with the position. The characteristic clinical manifestation is the increase of heart rate ≥30 times within 10 minutes when the patient’s position changes from supine position to upright position. -1, or maximum heart rate ≥ 120 times .min-1. The pathogenesis of orthostatic tachycardia is not yet clear, and may be mainly associated with changes in central blood volume, autonomic and muscular dysfunction, vascular endothelial dysfunction and genetic variation.