In EKG interpretation, what does the J point indicate?

The J point marks a crucial moment in the EKG waveform. It represents the end of ventricular depolarization and the beginning of ventricular repolarization. At this point, the electrical stimulus has completed its journey through the ventricles, leading to contraction. The J point is typically identified as the junction between the end of the QRS complex and the beginning of the ST segment.

Understanding where the J point occurs is essential for interpreting various cardiac conditions. For example, deviations from the normal ST segment that follows the J point can indicate issues such as ischemia or other cardiac abnormalities. Recognizing that the J point signifies the transition to ventricular repolarization helps in assessing the overall electrical activity of the heart and the health of the cardiac muscle.