The manifestations of myocardial ischaemia can be mild or severe, depending on the degree of ischaemia and how long it lasts.
Milder forms of myocardial ischaemia may be asymptomatic, and shorter forms may simply cause discomfort in the precordial region, forcing the patient to rest, which can affect their quality of life to some extent.
Severe and long-lasting myocardial ischemia can cause infarction of the heart muscle due to lack of blood supply, which will not only produce severe pain, but also cause various arrhythmias and cardiac insufficiency, and in serious cases, sudden death; some patients may remain with various arrhythmias and varying degrees of cardiac insufficiency even after rescue to pass the dangerous period, which will greatly reduce the quality of life of the patient and shorten the life span significantly.