A positive
delta wave in lead aVF identified a right anterior/anterolateral accessory pathway (RA/RAL).
For the Age 2 (30 to 49) group, the Alpha waves were decreased, however they were not significant, but the Theta and
Delta waves were significantly increased.
Stages 2 and 3 are deeper sleep, and associated with
delta waves on the EEG.
The characteristic ECG findings include a short Printerval, a wide QRS complex, and the presence of a
delta wave. The PR interval is short 0.12 second) owing to the electrical impulse bypassing the normal delay occurring at the atrioventricular (AV) node and rapidly stimulating the ventricles.
Short PR interval and
delta wave is the expression of preexcitation caused by accessory pathway.
The local ventricular electrogram was 37 msec earlier then the onset of
delta wave at that spot (Fig.
This third stage of sleep (https://education.ninds.nih.gov/brochures/Brain-Basics-Sleep-6-10-08-pdf-508.pdf) comes with the slow brain waves known as
delta waves and the eyes and muscles do not move.
The short PR interval (0.10 seconds), wide QRS complex (0.12 seconds), and
delta waves (best seen in leads II, III, aVF, V1, V3-V6), are features of ventricular preexcitation of the Wolff-ParkinsonWhite type (WPW).
The Alpha frequency is produced when we are physically and mentally relaxed as well as aware of our surroundings, The Theta and
Delta waves range from a state of reduced consciousness to being completely unconscious.
Considering variations, EBB was defined as low-amplitude bursts of rhythmic sharp beta waves of 20-30 Hz that were superimposed on low or moderate-amplitude
delta waves of 1-4 Hz or theta waves of 4-7 Hz that could be rhythmic.
Synchronized sleep normally starts as [S.sub.I], with frequent spindles, followed by [S.sub.II], in which spindles and
delta waves predominate.
Delta waves from 0-4Hz represent sleep, Theta waves between 4-8Hz represent drowsiness, Alpha 8-12Hz has a relaxed focus.
