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应用同步描记心电图、心音图、颈动脉搏动图和心尖搏动图以测定高原人体的左心室舒张功能和顺应性。在4个不同海拔高度进行实验,即76m(海平对照)、2161m、3270m和4179m,每一高度40名健康男性青年,高原3组世居、移居各20名。结果显示:随着海拔增高,主动舒张时间指数(TRTI)有减小趋势,RF波相对振幅(F/H)逐渐降低,A波相对振幅(A/D)则渐趋增大,3270m以上增大明显(p<0.05),舒张振幅时间指数(DATI)逐渐降低,3270m以上差异极显著(p<0.001)。高原世居与移居者相比,在海拔4179m出现明显差别,移居组TRTI、DATI、F/H较低而A/D较高(D<0.05)。测定射血前期与左室射血时间比值(PEP/LVET)、射血分数(EF)及左室周径纤维平均缩短速度(mVcf)3项指标作对照,显示在此高度左室收缩功能仍能保持。高原慢性心肌缺氧可能是导致左室舒张功能和顺应性轻度降低的原因。
Application of synchronous tracing ECG, phonocardiogram, carotid artery pulsation diagram and apical beating chart to determine the plateau human left ventricular diastolic function and compliance. Experiments were conducted at 4 different altitudes, ie 76m (sea level control), 2161m, 3270m and 4179m, 40 healthy male youths at each altitude, and 3 groups of highland settlers, each of whom migrated to 20 each. The results showed that as the altitude increased, the active diastolic time index (TRTI) tended to decrease, the relative amplitude of RF waves (F / H) decreased gradually, and the relative amplitude of A waves (A / D) (P <0.05), the diastolic amplitude time index (DATI) gradually decreased, and the difference of more than 3270m was significant (p <0.001). Compared with the settlers, there was a significant difference at 4179 m above sea level between the highland and the settlers. The TRTI, DATI, F / H and F / H of the emigrants were lower and the A / D was higher (D <0.05). PEP / LVET, EF and mVcf were measured as control group, showing that at this height, left ventricular systolic function was still Can keep. Chronic myocardial hypoxia may be responsible for the mild decrease in left ventricular diastolic function and compliance.