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A delta wave is a large, slow (less than 4 Hz) brain wave associated with deep sleep.

In the heart a delta wave in the ECG is seen in Wolff-Parkinson-White syndrome.

Delta waves

Delta waves are present only in stage-three sleep, stage-four sleep, cases of brain injury and coma. During sleep, delta waves are not present in the other stages (1, 2, and REM).

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