Spontaneous angina pectoris is not clearly related to increased myocardial oxygen demand caused by physical or mental exertion, but is related to reduced coronary blood flow reserve, and is caused by transient myocardial ischemia. Its characteristics are that the onset of pain is not clearly related to increased myocardial oxygen demand caused by physical or mental activity, but is related to reduced coronary blood flow reserve. The pain is more severe in degree, longer in duration, and is not easily relieved by sublingual nitroglycerin.
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This section is being translated and completed.
This section is being translated and completed.
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