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Related to delta wave: theta wave
a premature upstroke of the QRS complex due to an atrial ventricular bypass tract as in WPW syndrome.
An electrical oscillation occurring in the human brain at a frequency of less than about four hertz as recorded on an electroencephalogram, associated with a state of deep sleep or unconsciousness. Also called delta rhythm.
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.
Sleep disorders EEG activity with a frequency of < 4 Hz; in human sleep scoring, the minimum criteria for scoring DWs is 75 µV—peak-to-peak amplitude—and 0.5 second duration—2 Hz
delta waveCardiology 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.
del·ta wave(del'tă wāv)
1. A premature upstroke of the QRS complex due to an atrioventricular bypass tract as in Wolff-Parkinson-White syndrome.
2. Synonym(s): delta rhythm.