What does a "J-point" represent on an ECG?

The J-point represents the crucial transition between the end of the QRS complex and the beginning of the ST segment on an ECG. This point is significant for understanding the electrical activity of the heart, indicating the point at which ventricular depolarization concludes and repolarization begins. The J-point serves as a reference for assessing conditions like ST elevation or depression, which can indicate various cardiac issues such as ischemia or injury. Recognizing the J-point helps healthcare professionals accurately interpret ECG readings and identify potential dysrhythmias or other heart conditions.