DELTA WAVE IN ECG

1. DELTA WAVE
Dr.G.VENKATA RAMANA
MBBS DNB FAMILY MEDICINE

2. • Delta wave
• Slurred upstroke in the QRS complex
• It relates to pre-excitation of the ventricles,
and therefore often causes an associated
shortening of the PR interval
• It is most commonly associated with pre-
excitation syndromes such as WPW

3. • The characteristic ECG findings in Wolff-Parkinson-
White syndrome are:
• Short PR interval (< 120ms)
• Broad QRS (> 100ms)
• A slurred upstroke to the QRS complex (the delta wave)

4. • ECG examples of Delta Waves
• Delta wave
•Note that the remainder of the QRS remains normal — conduction still occurs
through the AV node and this is the dominant pathway
•On arrival to the ventricles, such conduction cancels out any pre-excitation
that has occurred via an accessory pathway

5. Negative delta waves (e.g. seen in lead aVR)
•These changes are simply reciprocal to those seen in leads II, aVL, V5 and V6