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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.
For effective EKG interpretation, one must first interpret its various components, which will be discussed in this short but concise EKG course. Atrial depolarization: the P-wave. In a normal heart an action potential generated in the SA-node will lead to depolarization of the atrial syncytium. The electrical activity associated with the depolarization of the atrial syncytium is visualized as a smooth complex on the ECG and is called the P wave. Normally, the P wave is an upright or positively deflected ECG complex. The PQ or PR interval. Once a cardiac impulse from the atria reaches the AV-node its speed of conduction is delayed. At this time no electrical activity is visible on the ECG.