delta wave

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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 ?
The goal in treating the sleep disorder in fibromyalgia is to get the patient into deep, delta wave sleep.
Delta waves are the signature frequency of the brainstem or first-line consciousness.
Theta waves, generated by the limbic system or the feeling level, are faster than first-line delta waves.
Reson-8, for example, contains eight audio programs: three for inducing alpha waves, three for theta waves, and two for delta waves.
Delta: Delta waves tend to be slower and are often associated with deep dreamless, restorative sleep.
Delta waves are responsible for the Q waves in leads II, III, and aVF and the R waves in leads [V.
Stage 3 sleep is characterized by 20% to 50% delta waves, and stage 4 has more than 50% delta waves.
The deepest stages, namely 3 and 4, which correspond to slow wave sleep (SWS), are characterized by the production of delta waves, which are recognized as a key component of sleep quality.