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find Author "李延军" 2 results
  • 无创正压通气治疗冠状动脉搭桥术后急性左心衰竭的疗效观察

    【摘要】 目的 观察早期无创正压通气对冠状动脉搭桥术后急性左心衰竭所致严重低氧血症的治疗效果。方法 40 例冠状动脉搭桥术后发生急性左心衰竭的患者随机分为两组。对照组( n =20) : 予以面罩吸氧、强心、利尿、扩血管等治疗; 治疗组( n = 20) : 在对照组基础上予以无创面罩正压通气。测定动脉血pH、PaO2、SaO2、PaCO2 , 观察血压、心率、呼吸及临床症状, 并进行相关分析。结果 治疗组在治疗后30 min 开始改善, 在1、3、6 h 时的改善明显优于对照组, 表现在pH、PaO2、PaCO2 、心率、呼吸频率、SaO2 方面( P lt;0. 05) ; 在纠正低PaO2 方面, 治疗组早期即表现出优越性。治疗组急性左心衰竭开始缓解的时间较对照组明显缩短( P lt;0. 01) 。结论 对于冠状动脉搭桥术后急性左心衰竭的冠心病患者, 在抗心衰治疗的同时短期使用无创正压通气可以较快纠正机体缺氧状况, 改善心功能, 缩短急性左心衰竭病程。

    Release date:2016-08-30 11:55 Export PDF Favorites Scan
  • Exercise-sensitive Indices Screening from Electrocardiogram Based on Rest-workload Alternating Pattern

    Heart rate is the most common index to directly monitor the level of physical stress by comparing the subject's heart rate with an appropriate "target heart rate" during exercise. However, heart rate only reveals the cardiac rhythm of the complex cardiovascular changes that take place during exercise. It is essential to get the dynamic response of the heart to exercise with various indices instead of only one single measurement. Based on the rest-workload alternating pattern, this paper screens the sensitive indices of exercise load from electrocardiogram (ECG) rhythm and waveform, including 4 time domain indices and 4 frequency domain indices of heart rate variability (HRV), 3 indices of waveform similarity and 2 indices of high frequency noise. In conclusion, RR interval (heart rate) is a reliable index for the realtime monitoring of exercise intensity, which has strong linear correlation with load intensity. The ECG waveform similarity and HRV indices are useful for the evaluation of exercise load.

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