(1) the nature of angina pectoris should be compression, oppression, asphyxia, heavy distension and pain rather than sharp pain or scratch pain, short needle like or electric touch pain, or continuous chest tightness. In fact, it's not "colic". In a few patients, the feeling of burning, tension, or shortness of breath is accompanied by a tight squeeze of the throat or the trachea. Pain or discomfort at the start of the lighter, gradually increased, and then gradually disappear, little affected by posture change or deep breathing.
(two) the location of pain or discomfort is often located in the sternum or its vicinity, or at any level between the upper abdomen to the pharynx, but rarely above the pharynx. Sometimes in the left shoulder and left arm, occasionally accompanied by on the right arm, mandible, cervical, thoracic, left scapula or scapular area, but in the left armpit or left chest are few. For the range of the distribution of pain or discomfort, the patient often needs to use the whole palm or fist to indicate only the few with the finger tip of one finger.
(three) the time limit is 1~15 minutes, most of the 3~5 minutes, sometimes 30 minutes (except for intermediate syndrome). The pain lasts for only a few seconds or discomfort.
(four) the predisposing factors were mainly physical exertion, and the second was emotional excitement. Go flat, brisk walking, walking, walking against the wind after a meal, even hard stool or your arms too slight movements of the head, exposure to other parts of the cold, cold, physical pain, and terror, tension, anger, worry, mood changes, can cause. The morning pain threshold low, slight labor such as brushing teeth, shaving, walking can cause seizures; morning and afternoon pain threshold then the heavier labor can not induce. It is not like angina pectoris at the time of physical activity, not at the time of physical activity. Physical activity plus emotional activity is more likely to be induced. Spontaneous angina can occur without any obvious inducement.
(five) the effect of nitroglycerin
If the sublingual Nitroglycerin Tablets is effective, the angina pectoris should be relieved within 1~2 minutes (there is also a need for 5 minutes, taking into account that the patient may not be able to estimate the time accurately). Nitroglycerin may be ineffective for recumbent angina. In assessing the effect of nitroglycerin, it is also necessary to pay attention to whether the drug used by the patient has failed or close to failure.