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患者女性,18岁,反复胸闷、心悸1周。常规心电图检查如图,请做出心电图诊断并说明主要诊断依据及鉴别诊断。
Patient female, 18 years old, repeated chest tightness, palpitations 1 week. Routine ECG examination shown in Figure, please make ECG diagnosis and explain the main diagnosis and differential diagnosis.