Why the study?
Does operative division of accessory pathways alter the electrophysiologic properties of the atrioventricular conduction system in patients with Wolff-Parkinson-White syndrome compared to controls?
Does operative division of accessory pathways alter the electrophysiologic properties of the atrioventricular conduction system in patients with Wolff-Parkinson-White syndrome compared to controls?
Surgical division of accessory pathways in Wolff-Parkinson-White syndrome is associated with significantly shorter effective and functional refractory periods of the AV node compared to published controls.
Shorter AV nodal ERP after accessory pathway division in WPW; hypothesis-generating for altered conduction, should not yet change practice.
Nineteen consecutive patients with the Wolff-Parkinson-White syndrome underwent electro- physiologic study 7-39 days (mean 11 days) after operative division of their accessory pathways. All patients had a poor response to medical management before surgery. The results from 16 adult patients were compared with published control data. There was no difference between control and postoperative groups in the effective refractory period (ERP) and functional refractory period (FRP) of the atria. The ERP of the atrioventricular (AV) node was significantly shorter in the postoperative group than in the control group with pacing cycle lengths 450-549 msec (275 46 msec vs 336 41.7, p < 0.01) and 350-449 msec (244 32 msec vs 333 i 30.3, p < 0.01). At all cycle lengths the FRP of the AV node was significantly shorter in the postop- erative group than in the control group. In addition, conduction time over the AV node during fixed-rate atrial pacing was at least 100 msec shorter in the postoperative patients than in controls.
No takes yet. Share an insight, caveat, or question.
Prystowsky et al. (1979) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: