Can myocardial ischemia be detected by electrocardiogram?

Myocardial ischemia can be detected by electrocardiogram (ECG) under certain conditions. ECG is one of the commonly used methods for diagnosing myocardial ischemia. When myocardial ischemia occurs, typical changes on the ECG may include ST-segment depression, T-wave inversion, or flattened T-waves. However, ECG diagnosis of myocardial ischemia is not absolutely accurate. Sometimes, even when myocardial ischemia is present, the ECG may appear normal; this condition is known as "silent myocardial ischemia." Other factors such as electrolyte imbalances or medication effects may also cause ECG changes resembling those of myocardial ischemia, leading to misdiagnosis.

If myocardial ischemia occurs only transiently and has already resolved at the time of ECG examination, the abnormality may not be captured. To achieve a more accurate diagnosis of myocardial ischemia, it may be necessary to combine the patient's symptoms and medical history with other diagnostic tests, such as exercise stress testing, echocardiography, or coronary angiography. If you experience any physical discomfort, you should seek medical attention promptly.