III度房室阻滞患者VVI起搏时运动耐力和心力储备的研究

采用心肺运动试验的方法，对１６例ＶＶＩ起搏的ＩＩ度房室阻滞患者行最大症状限制性运动试验，以测定病人的心力储备和耐力储备。结果表明病人运动时心脏指数较运动前增加１倍。最大作功８８．６±１６．３６Ｗ／ｍｉｎ，最大氧耗量１７．３８±４．４８ｍｌ／ｍｉｎ。１６例中有９例未测出无氧阈。极量运动时每个病人都出现运动性心律失常。认为ＶＶＩ起搏的患者极量运动时病理生理特点是低无氧阈、低最大氧耗量、低心输出量、低全身耐力。

The Research of Exercise Endurance and Cardiac Reserve in Patients With Complete Atrioventricular Block Treated With VVI Pacing

There were 16 patients aged 25～62 years with complete atrioventricular block and treated with VVI pacing.Cardiopulmonary exercise testing was performed on a treadmill.Anaerobic threshold was assessed by determination of ventinatio threshold.Cardiac output was determined by CO 2 rebreathing method.The pacing rate was programmed to 80 ppm and increased to 84±4 ppm at peak of exercise.Mean cardiac index at rest (CI at ) was 2.41±0.58 L/(min·m 2) and at peak of exercise ( CI max ) was 4.87±0.79 L/(min·m 2).V O 2 at was 6.78±1.71 ml/(kg·min) and V O 2 max 17.38±4.48 ml/(kg·min).Work load at was 12±2 W/min and work load max was 88.6±16.36 W/min.9 patients had no anaerobic threshold detected.Conclusion:the patients with complete atrioventricular block treated with VVI pacing have low cardiac reserve,low anaerobic threshold,low exercise endurance.