Thẻ: cardiac diagnosis

Electrocardiogram (ECG) and Its Diagnostic Value in Cardiovascular Diseases Part 1. Normal Electrocardiogram (ECG) An electrocardiogram (ECG or EKG) is a non-invasive medical procedure used to record the electrical activity of the heart. By attaching electrodes to the skin, the ECG measures voltage changes during different phases of the cardiac cycle. These electrical signals are […]