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X 综合征临床有心绞痛样症状,运动试验心电图呈“缺血性”ST 改变,施行冠状动脉造影无异常发现者,称“X 综合征”.本综合征多见于45岁以下的中青年妇女,其发生机制还不清楚,可能与下列因素有关:(1)血红蛋白——氧离解曲线异常;(2)女性运动后所产生的乳酸较男性高;(3)原发性心肌代谢障碍等。本综合征预后良好,无需特殊治疗。心室早期复极综合征正常人心电图上出现酷似心脏病引起的 ST 段抬高,称为“心室早期复极综合征”.心电图特点:(1)J 点处 ST 段抬高≥正常值;(2)R 波降支近基线处有明显的切迹或 J 波;(3)ST段抬高的形状为凹面向上;(4)抬高的 ST 段极短,其后紧接一对称高大的 T 波。ST 段抬高以 V_3～V_5最明显,以 R 波为主的肢体导联也常显示。抬高的 ST段形状类似急性心包炎或心外膜下心肌损伤,但无
Syndrome X clinical angina-like symptoms, exercise test ECG showed “ischemic” ST changes, coronary angiography performed without abnormal findings, called “Syndrome X.” The syndrome more common in young women under 45 years of age, Its mechanism is unclear, may be related to the following factors: (1) hemoglobin - oxygen dissociation curve abnormalities; (2) women’s exercise than the men’s high lactate; (3) primary myocardial metabolic disorders. The prognosis of this syndrome is good, without special treatment. Early ventricular repolarization syndrome normal ECG appears exactly like ST-segment elevation caused by heart disease, known as “ventricular repolarization syndrome.” ECG features: (1) J point ST elevation ≥ normal; ( 2) R wave descending branch near the baseline at a significant notch or J wave; (3) ST segment elevation shape concave upward; (4) elevated ST segment is very short, followed by a symmetrical tall T wave. ST segment elevation to V_3 ~ V_5 most obvious to R wave limb leads are also often shown. Elevated ST segment shape resembles acute pericarditis or subepicardial myocardial injury, but none