As a medical professional with expertise in cardiology, I can explain that an ST segment depression is a diagnostic finding on an electrocardiogram (ECG) that can indicate a potential issue with the heart's electrical activity. The ST segment specifically represents the interval between the ventricular depolarization and repolarization phases of the heart's electrical cycle. When the ST segment appears depressed, or lower than the isoelectric line (which is the flat baseline of the ECG), it can be a sign of myocardial ischaemia or infarction. In simpler terms, the heart muscle may not be getting enough oxygen-rich blood, which can lead to chest pain or even a heart attack. However, it's important to note that ST segment depression can also be seen in other conditions and is not always indicative of a heart problem. It's crucial to consider the ECG in the context of the patient's symptoms, medical history, and other diagnostic tests. read more >>

It represents the interval between ventricular depolarization and repolarization. The most important cause of ST segment abnormality (elevation or depression) is myocardial ischaemia or infarction.read more >>