In a normal heart beat, the T wave represents repolarisation of the ventricles, specifically the repolarisation of the AV node and bundle branches. The U wave occurs when the ECG machine picks up repolarisation of the Purkinje fibres.
Osborn Wave (J Wave) Overview The Osborn wave (J wave) is a positive deflection at the J point (negative in aVR and V1). It is usually most prominent in the precordial leads. Eponymously associated with John Jay Osborn (1917-2014) following his 1953 'current of injury' description in hypothermic dogs.Jul 13, 2021
By definition, a Q wave on the electrocardiogram (ECG) is an initially negative deflection of the QRS complex. Technically, a Q wave indicates that the net direction of early ventricular depolarization (QRS) electrical forces projects toward the negative pole of the lead axis in question.Jan 5, 2021
Substances in your blood called electrolytes — such as potassium, sodium, calcium and magnesium — help trigger and conduct the electrical impulses in your heart. Electrolyte levels that are too high or too low can affect your heart's electrical impulses and contribute to arrhythmia development.Aug 9, 2020
Negative U waves have low sensitivity but high specificity for heart disease and they are recorded in approximately 1% of all electrocardiograms in general hospital . Negative U waves at rest, may be the earliest marker of unstable angina and evolving myocardial infarction .Jan 1, 2005
The U wave is a small, rounded deflection sometimes seen after the T wave (see Fig. 2-2). As noted previously, its exact significance is not known. Functionally, U waves represent the last phase of ventricular repolarization. Prominent U waves are characteristic of hypokalemia (see Chapter 10).