For the single ventricle, early surgical intervention is required to prevent pulmonary congestion and severe cyanosis.
单心室患者早期必须采取手术治疗，防止肺部充血和严重缺氧。
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Results: Their main cause to colour Doppler echocardiography were murmur, cyanosis, panting, asphyxia, feeding-difficulty, Loud pulmonary valve second heart sound.