What is the role of electrocardiogram (ECG) in the diagnosis of Wolff-Parkinson-White (WPW) syndrome?

Updated: Jan 08, 2017
  • Author: Christopher R Ellis, MD, FACC, FHRS; Chief Editor: Mikhael F El-Chami, MD  more...
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The diagnosis of WPW syndrome is typically made with a 12-lead electrocardiogram (ECG) and sometimes with ambulatory monitoring (eg, telemetry, Holter monitoring). SVT is best diagnosed by documenting a 12-lead ECG during tachycardia, although it is often diagnosed with a monitoring strip or even recorder. The index of suspicion is based on the history, and rarely, physical examination (Ebstein anomaly or hypertrophic cardiomyopathy [HOCM]). Although the ECG morphology varies widely, the classic ECG features are as follows:

  • A shortened PR interval (typically <120 ms in a teenager or adult)
  • A slurring and slow rise of the initial upstroke of the QRS complex (delta wave)
  • A widened QRS complex (total duration >0.12 seconds)
  • ST segment–T wave (repolarization) changes, generally directed opposite the major delta wave and QRS complex, reflecting altered depolarization

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