The J wave (wave of Osborn) is an infrequent finding in the ECG which can be seen due to a variety of causes.
The J wave is present the J point, where the QRS complex transitions to the ST segment. It can be seen in the precordial and limb leads. It occurs at the end of depolarization and the beginning of repolarization.
It may be elevated (positive) or depressed. It is defined as positive if >= 0.1 mV above the isoelectric line in >= 2 contiguous leads.
