meaning of delta waves on ekg
1 also called delta rhythm, the slowest of several types of brain waves, characterized by a frequency of 4 Hz and a relatively high voltage. Delta waves are deep-sleep waves associated with a dreamless state from which an individual is not easily aroused. Compare alpha wave, beta wave, theta wave. 2 (in cardiology) a slurring of the QRS portion of an electrocardiogram tracing caused by preexcitation in Wolff-Parkinson-White syndrome. Cardiology An EKG finding in WPW syndrome, seen as a slow upstroke of the QRS wave in a background of short P-R intervals See Wolff-Parkinson-White syndrome.