What is an abnormal ECG reading?

An abnormal ECG reading can indicate a variety of cardiac conditions, ranging from benign variations to serious medical emergencies. As a cardiologist, I interpret ECGs to assess the heart's electrical activity and identify any irregularities. Here's a breakdown of what an abnormal ECG might signify: 1. Arrhythmias: These are irregular heartbeats that can be life-threatening if severe. 2. Myocardial Infarction (MI): Also known as a heart attack, an ECG can show changes indicating tissue damage due to lack of oxygen. 3. Ischemia: A reduction in blood supply to the heart, which can be seen as ST-segment changes on the ECG. 4. Cardiomyopathy: A disease of the heart muscle that can cause the heart to become enlarged, thick, or rigid, and it may show up as abnormal Q-waves or T-waves. 5. Valvular Heart Disease: Abnormalities in heart valves can sometimes be inferred from ECG changes. 6. Long QT Syndrome: A genetic condition that can cause a dangerously irregular heart rhythm, identified by a prolonged QT interval on the ECG. 7. Hypertrophy: Enlargement of the heart, particularly the left ventricle, which can be indicated by ECG changes. 8. Conduction Disorders: Problems with the electrical conduction system of the heart, which can result in a variety of ECG patterns. It's important to note that not all abnormal ECG readings are cause for concern. Some variations are considered normal variants and do not affect a person's health. However, any abnormality requires further evaluation by a healthcare professional to determine its significance and appropriate course of action.

An electrocardiogram (EKG) measures your heart's electrical activity. ... Sometimes an EKG abnormality is a normal variation of a heart's rhythm, which does not affect your health. Other times, an abnormal EKG can signal a medical emergency, such as a myocardial infarction (heart attack) or a dangerous arrhythmia.