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作者在海拨4500米高度观察32例经心电向量图诊断为右心室肥厚或可疑右室厚者对吸氧试验的反应,检查了他们在吸氧(40％)前后心电向量图、心脏听诊、间接测算肺动脉收缩压和肺血流图的变化。结果看到,吸氧后有关指标的变化均反映肺血管阻力和肺动脉压明显下降,说明低氧所引起的肺血管收缩在短暂吸氧后立即缓解,移居者的肺血管收缩可能主要属于功能性改变。心电向量图的改变是肺动脉压升高造成右心负荷增加的结果,短暂吸氧不能引起它的改善。
The authors observed 32 patients with right ventricular hypertrophy or suspicious right ventricular hypertrophy responding to oxygen tests at a height of 4500 meters at sea level and examined their electrocardiogram before and after oxygen inhalation (40%), heart Auscultation, indirect measurement of pulmonary artery systolic blood pressure and pulmonary blood flow changes. The results showed that changes in indicators after the oxygen reflect the pulmonary vascular resistance and pulmonary pressure decreased significantly, indicating that hypoxia caused by pulmonary vasoconstriction in a brief oxygen immediately after the relief of migratory pulmonary vasoconstriction may be mainly functional change. Changes in ECG vector diagram is the result of increased right pulmonary artery pressure caused by increased pulmonary arterial pressure, short-term oxygen can not cause it to improve.