患者男、29岁,建筑工人。两年前于劳动中曾昏倒一次,此后每于紧张激烈活动时感头晕、眼花,几欲昏倒,稍加休息即可好转。检查:一般情况良好,血压110/70mmHg。无发绀及杵状指。心界稍大,心律不整,约45次,无病理性杂音。其它无异常发现。X线:肺野正常,两心室圆隆稍大。心电图示左心室 Patient male, 29 years old, construction worker. Two years ago in the work had fainted once, after every intense and intense activity dizziness, vertigo, a few want to collapsed, a little rest can be improved. Check: The general condition is good, blood pressure 110 / 70mmHg. No cyanosis and clubbing means. Heart slightly larger, irregular heartbeat, about 45 times, no pathological murmurs. No other abnormal findings. X-ray: lung field normal, slightly larger two-ventricle circle. ECG left ventricle