All of the following statements about WPW syndrome are true, Except:
Answer is A (More common in females) WPW syndrome is more common in males and the incidence varies from 0.1 to 3/1000 in apparently healthy subjects (Le 0.01 to 0.3 percent) WPW syndrome : Accessory AV Pathways WPW syndrome or `Prexcitation syndrome' is charachterized by the presence of tachyarrvthmiasQ due to an accessory conducting pathwaye between atrium and ventricle WPW abnormality occurs when an impulse reaches the atria or ventricles earlier than would be expected if the impulse traveled by way of normal specialized conducting tissue (Pre excitation)Q - When atrial impulse activates the entire or some pa of ventricle - When ventricular impulse activates the entire or some pa of the atrium Epidemiology Incidence varies from 0.1 to 3.0/1000 in apparently healthy subjects (Average = 1.5/1000) It may be found in all ages (Neonates to Elderly) Prevalence decreases with age apparently because of loss of preexcitation It is more common in Males Most adults with WPW syndrome have normal hea (However various acquired and congenital defects may be associated specially Ebstein's anomaly, MVP and cardiomyopathics) Electrocardiographic features Three basic features typify the ECG abnormalities with usual form of WPW syndrome Sho PR interval (PR interval <120 ms during sinus rhythm)e Wide QRS complex (>120 ms) with a slurred slowly rising upstroke (delta wave) Q The terminal poion of QRS complex is usually normal as conduction through bundle of His usually catches up with preexcitation Secondary ST-T changese that are generally directed to an opposite direction to the major Delta/ QRS vectors Note : Fusion beats: e If the accessory pathway is capable of anteprade conduction, the typical QRS complex represents a `Fusion beat' as a result of depolarization of the ventricle in pa by the wave travelling from the accessory pathway and in pa by wave travelling from normal AV nodal pathway Normal p waveQ - Since the atrial activation is normal, the P wave is usually normal
More common in females
Rt ventricular aberrant is commonly seen
Incidence | with age
Hea is structurally normal