Methods A new portable device for detection of endothelium dysfunction by photoplethysmographic method was designed, which depended on the principle of reactive hyperaemia.

• 方法：根据反应性充血导致内皮依赖性血管舒张的原理，基于光电容积脉搏波设计了一种便携式动脉内皮功能障碍检测仪。