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SUMMARYA patient with W-P-W syndrome (type A) and disabling supraventricular tachycardia was studied with epicardial mapping prior to surgical interruption of the circus pathway. Analysis of the delta vector Received November 27, 1970; revision accepted for publication October 13, 1971. 522 cently, three different surgical technics have been described for patients with disabling SVT accompanying W-P-W. These include (1) the use of a pacemaker with external rate control to stop the SVT,' (2) surgical interruption of the accessory A-V pathway,2 and (3) surgical A-V block followed by use of a pacemaker. [3][4][5] Recent surgical approaches and studies with epicardial mapping have helped to identify the location of the accessory pathway in the various types of the W-P-W syndrome.2' 56 Epicardial mapping followed by interruption of the accessory pathway has so far been accomplished only in types B and AB of the

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