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.
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 ?
On analysis of the subband energies, it was found that the share of delta subband increased substantially with encephalopathy at the expense of decreased energy of predominant alpha waves; delta wave was seen to be around two times that of the normal EEG.
Alpha wave activity is seen simultaneously with delta wave activity.
In this preliminary observational study, we quantified the effect of noxious stimuli on these episodic EEG waveforms (10 Hz spindle-like waves and slow oscillations in high frequency power) as well as the non-episodic delta waves, in a cohort of healthy patients undergoing general anaesthesia.
In children ages 11 to 16.5, there was a sharp drop in delta waves. "We think this decline is driven by synaptic pruning," says Campbell.
The electrocardiogram showed sinus rhythm with ventricular pre-excitation (short PR interval, wide QRS complex with delta wave) (Fig.
* Stage 4: A very deep sleep in which more than half of brain waves are delta waves. Waking suddenly from this stage may cause grogginess and disorientation.
The researchers calculated the power ratio of alpha waves to theta waves (A/T); the ratio of alpha waves to delta waves (A/D); and the ratio of alpha waves to the sum of theta and delta waves (A/T+D).
The brain begins to produce delta waves, a type of wave that is large (high amplitude) and slow (low frequency).
Electroencephalograph (EEG) demonstrated intermittent irregular slow delta waves in the right frontal and left temporal regions but no biphasic or triphasic waves.
The increased slow-wave activity consists of alpha, theta and delta waves (Schuman, 1980).
By placing the electrodes of an electroencephalogram on the skull right above the cerebral cortex, one can record brain waves that reveal a range of levels of consciousness, from alertness (beta waves) to NREM sleep (delta waves).