Figure 39l

Illustration of ventrucutar septal myotomy-myectomy operation (Morrow procedure).
A. Two verticaL parallel myotomies are made in the cephalad portion of the septum about 1 cm apart. Transverse incision is then made, connecting the two parallel myotomies.
B. Attachments of the muscle bar to the septum are divided; this segment of muscle is isolated and then excised.
C. After completion of the myotomy-myectomy, a rectangular channel about 4 cm long and 2 cm wide is evident extending from the aortic annulus to a point just distal to the caudal margins of the mitral leaflets.

(From Maron BJ et al,with permission from the authors and the European Heart Journal.)

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