患者,男,33岁,阵发性心悸8月,且无其他症状。3月前心电图发现房早二联律,偶发室早。否认病前受凉及关节疼痛等史。体检:体温36.4℃。脉搏66次/分,不齐。头颈部无异常。心界不大,心尖区第一心音稍弱,早搏8次/分,未闻及杂音。双肺(一)。脊柱四肢无异常。实验室及辅助检 The patient, male, 33 years old, had paroxysmal palpitations in August and had no other symptoms. 3 months ago ECG found room early couplet law, sporadic room early. Denied the history of cold and joint pain before illness. Physical examination: body temperature 36.4 ℃. Pulse 66 beats / min, missing. Head and neck no abnormalities. Heart is not big, the first heart area of ​​apex weak, premature beats 8 times / min, no smell and noise. Double lungs (a). Spine limbs without exception. Laboratory and auxiliary inspection