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症状可分为自觉症状和体征。了解症状易出现的时间带,对疾病的诊断、治疗、预防或者研究有着重要的作用。同时,也可预防性服用药物。还可应用于健康管理。容易出现症状的条件,可分为机体条件和环境条件。机体方面,有机体所固有的周期性变动(内源性变动)和日常生活中的运动,觉醒、睡眠、排尿、排便,体位变换、饮食等外因性变化。环境方面,有地球物理学上环境(气象变化等),生物学上的环境,人的、物的、社会环境等。机体条件与环境条件相辅相成,超越某种阈值时就出现症状。易出现症状时间带的实例循环系统疾病症状易出现的时间带是相当明瞭的,这里就此加以叙述。变异性心绞痛:心绞痛是因一过性心肌缺血而出现胸闷、胸痛症状的疾病。心绞痛有二型,即ST 段上升型和ST 段下降型。前者是变异性心绞痛,后者是一般的心绞痛。变异性心绞痛是由于冠状动脉的大分枝发生一过性痉挛使冠脉血流迅速减少引起的。一般心绞痛(劳力性心绞痛)是因劳动使心肌供氧失去平衡,心肌缺血而
Symptoms can be divided into symptoms and signs. To understand the time-prone symptoms, the diagnosis of disease, treatment, prevention or research has an important role. At the same time, drugs can also be taken preventively. Can also be applied to health management. Symptoms prone to conditions can be divided into the body conditions and environmental conditions. The body, the inherent cyclical changes in organisms (endogenous changes) and daily life activities, awakening, sleep, urination, defecation, posture changes, diet and other exogenous changes. On the environment, there are the geophysical environment (weather changes, etc.), biological environment, human, material, social environment. Body conditions and environmental conditions complement each other, beyond a threshold when the symptoms appear. Examples of Time-Varying Symptoms Time-zones in which symptoms of the circulatory system tend to occur are fairly straightforward and are described here. Variant angina: angina pectoris is a symptom of chest tightness, chest pain due to transient myocardial ischemia. There are two types of angina pectoris, that is, ST segment rising type and ST segment descending type. The former is variant angina, while the latter is general angina. Variant angina pectoris is caused by a transient spasm of the major branches of the coronary arteries to rapidly decrease coronary blood flow. General angina (exertional angina) is due to work to lose balance of myocardial oxygen supply, myocardial ischemia and