delta wave


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Related to delta wave: theta wave

del·ta wave

a premature upstroke of the QRS complex due to an atrial ventricular bypass tract as in WPW syndrome.

delta wave

n.
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.

delta wave

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
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 wave

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.

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.

delta wave

A low-frequency brain wave, recordable on the ELECTROENCEPHALOGRAM, that originates in the frontal part of the brain during deep sleep in normal adults.
References in periodicals archive ?
Theta: Theta waves are faster than delta waves, but still slow and typically are correlated with light sleep, daydreaming, inattention, creativity, and self-hypnosis.
For example, "Our sleep titles help drop you into the deep delta waves.
Unlike many Quantitative Self devices, the TrueSense bio-sensor can distinguish brain waves from muscle waves, and is even able to individually track the different classifications of brain waves -- from super beta to delta waves -- giving users an in-depth look at their mental state.
During the study, ablation of the left posteroseptal wall near the mitral annulus increased the H-V and P-R intervals to normal, and delta waves disappeared (Figure 2).
Theta (5-8 Hz) and delta waves (0-4 Hz) are observed when a person is daydreaming and sleeping respectively.
There's a debate in the medical literature about whether deep sleep - delta waves - consists of one stage or two," explained Toronto psychiatrist Colin Shapiro.