Understanding EKG Terminology

Overview

An electrocardiogram (EKG or ECG) is a visual representation of the electrical activity of the heart. During a normal heartbeat, electrical signals start in the sinoatrial node (the heart's natural pacemaker), spread through the atria, pass through the atrioventricular node, and then travel down to stimulate the ventricles to contract. This pattern of electrical activity ensures that blood is pumped effectively throughout the body.

An EKG tracing consists of three main components during each heartbeat:

  • The P wave indicates the depolarization of the atria. This is when the atria contract to push blood into the ventricles.
  • The QRS complex shows the depolarization of the ventricles. This is when the ventricles contract to pump blood out of the heart to the lungs and body.
  • The T wave represents the repolarization of the ventricles. This is when the ventricles relax and prepare for the next heartbeat.

Abnormalities in these components can indicate various heart conditions like arrhythmias, conduction defects, or cardiac hypertrophy. Monitoring these components helps healthcare providers assess heart health and diagnose potential issues.

What does an abnormal P wave, QRS complex, or T wave indicate about my heart health?

How does the electrical activity of the heart affect its ability to pump blood effectively?

What are some common heart conditions that can be diagnosed through an EKG?