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患者，男，50岁，体重70kg。主诉体位变动后心前区痛伴左侧肩背部放射性痛3个月，并有昏厥史数次，以左房粘液瘤（LAM）收住院。超声心动图提示左房腔内可见中等强度回声团，呈蜂窝状，大小为56．8mm×45．3mm×38．9mm，拟于体外循环下行LAM摘除术。肝素化前自右颈内静脉采血Z
The patient, male, is 50 years old and weighs 70kg. After the chief complaint, the pain in the precordial area was accompanied by radiation pain in the left shoulder and back for 3 months, and there was a history of fainting several times. The patient was admitted to the left atrial myxoma (LAM). Echocardiography suggested that the medium-intensity echo group was visible in the left atrial sac, showing a honeycomb shape with a size of 56.8 mm x 45.3 mm x 38.9 mm. Before heparinization, blood was collected from the right internal jugular vein Z