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Wolff-Parkinson-White Syndrome
Aka: Wolff-Parkinson-White Syndrome, Wolff-Parkinson-White, WPW Syndrome
- Definition
- Arrhythmia associated with AV bypass tract
- Epidemiology
- Prevalence: 2 per 1000 general population
- Pathophysiology
- Atrioventricular bypass tract
- Circumvents normal PR interval delay (up to 0.2 sec)
- Allows for ventricular pre-excitation
- Predisposes to arrhythmia
- Reentrant Paroxysmal Supraventricular Tachycardia
- Paroxysmal Atrial Fibrillation
- Findings: EKG changes (variably present)
- Wide QRS (to extent that PR interval is narrowed)
- Narrow PR interval
- Due to pre-excitation of ventricle
- Look closely for Delta wave when a narrow PR interval is identified on EKG
- Delta wave
- Slurred upstroke of QRS (hockey stick appearance)
- Differential Diagnosis
- Right or Left Bundle Branch Block (wide complex)
- Myocardial Infarction (Q Wave when QRS negative)
- Precautions
- Do not use Digoxin or Verapamil with WPW
- May accelerate arrhythmia via accessory path
- Have a high index of suspicion in young patients with Syncope
- WPW may be present despite an absence of Short PR Interval and a Delta Wave
- Sinus Tachycardia can still occur with all of the typical reasons seen in patients without WPW
- Consider dehydration, infection, Pulmonary Embolism in the differential in a patient with WPW and Tachycardia
- Management
- See Unstable Tachycardia
- Safe interventions in WPW
- Adenosine
- Procainamide
- Synchronized Cardioversion
- References
- Braude, Swadron and Orman et. al. in Majoewsky (2012) EM:RAP 12(7): 1-2
- Goldberger (1999) Clinical Electrocardiography, p 127-8
- Grauer (2001) 12 Lead EKG, p. 27