Abstract
A new technique for intracardiac phonocardiography of the left side of the heart is described. If a catheter with an inside diameter of 1.75 mm. is used for transseptal left heart catheterization, a microphone catheter with a diameter of 1.50 mm. can be introduced into the left side of the heart through the transseptal catheter. Preliminary results in 25 patients are presented.
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