What is a epsilon wave?
What is a epsilon wave?
An Epsilon wave is the characteristic ECG finding in arrhythmogenic right ventricular dysplasia (ARVD). The Epsilon wave occurs just after the QRS in lead V1 representing early afterdepolarizations. The morphology of the epsilon wave is frequently described as a “grassy knoll” appearance.
What are Epsilon waves used for?
The epsilon wave, the hallmark feature of ARVC, is a marker of delayed activation of the RV free wall and outflow tract and is considered a major diagnostic criterion for ARVC.
Why is it called P wave?
His labeling of the primitive tracing was then mixed: A and B, the first letters of the alphabet, were used to indicate ventricular events, and P, from near the middle of the alphabet, was used to indicate atrial events.
What are the waves on an ECG called?
The waves on an ECG include the P wave, Q wave, R wave, S wave, T wave and U wave. Interval: The time between two specific ECG events. The intervals commonly measured on an ECG include the PR interval, QRS interval (also called QRS duration), QT interval and RR interval.
What causes J wave?
There are four principal causes of J waves, namely hypothermia, Brugada syndrome, early repolarization and hypercalcemia. Figure 1. Osborn wave (J wave). These waves occur due to hypothermia, hypercalcemia, early repolarization and Brugada syndrome.
What causes Osborn waves?
J waves, also known as Osborn waves or the camel-hump sign, can be caused by hypercalcemia, brain injury, subarachnoid hemorrhage, and cardiopulmonary arrest from oversedation, vasospastic angina, or ventricular fibrillation.
What are Lambda brain waves?
Lambda waves are physiological, triangular shaped, sharp transients occurring over the occipital regions when eyes are open. Lambda waves occur with saccadic eye movements during visual scanning, disappearing when eyes are closed and in sleep.
What does S wave stand for?
shear wave
An S wave, or shear wave, is a seismic body wave that shakes the ground back and forth perpendicular to the direction the wave is moving.
What does QRS wave represent?
The QRS complex represents the depolarization of ventricles. It shows the beginning of systole and ventricular contraction. The QRS complex or wave starts with a small deflection downwards, represented by the point Q. It follows the P wave.
What is the heartbeat line called?
The QRS complex is a record of the movement of electrical impulses through the lower heart chambers (ventricles). The ST segment shows when the ventricle is contracting but no electricity is flowing through it. The ST segment usually appears as a straight, level line between the QRS complex and the T wave.
What does AJ wave mean?
The “J wave” (also referred to as “the Osborn wave,” “the J deflection,” or “the camel’s hump”) is a distinctive deflection occurring at the QRS-ST junction. In 1953, Dr. John Osborn described the “J wave” as an “injury current” resulting in ventricular fibrillation during experimental hypothermia.
