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Conduction through the accessory pathway results in a delta wave. A characteristic "delta wave" (arrow) seen in a person with Wolff–Parkinson–White syndrome. Note the short PR interval. Specialty: Cardiology: Symptoms: Abnormally fast heartbeat, palpitations, shortness of breath, lightheadedness, loss of consciousness [1] [2] Complications
Lown–Ganong–Levine syndrome is a clinical diagnosis that came about before the advent of electrophysiology studies. It is important to be aware that not all WPW ECGs have a delta wave; the absence of a delta wave does not conclusively rule out WPW. [citation needed]
12 lead electrocardiogram of an individual with Wolff–Parkinson–White syndrome exhibiting 'slurred upstrokes' or 'delta waves' before the QRS complexes. An episode of SVT may present with palpitations, dizziness, shortness of breath, or losing consciousness (fainting). The electrocardiogram (ECG) would appear as a narrow-complex SVT.
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A delta wave is an initial slurred deflection seen in the initial part of an otherwise narrow QRS of a patient at risk for WPW and is an indicator of the presence of an accessory pathway. These beats are a fusion between the conduction down the accessory pathway and the slightly delayed but then-dominant conduction via the AV node.
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Video explanation. Author: Tanner Marshall, MS Editor: Rishi Desai, MD, MPH, Tanner Marshall, MS Wolff-parkinson-white pattern, or WPW, is a type of heart arrhythmia caused by an accessory pathway, or an “extra” electrical conduction pathway connecting the atria and ventricles, or upper and lower chambers of the heart.