Surgery for Left XXXX with a Relatively Thin Interventricular Septum.

@entity1 @entity1121 @entity339 @entity3585
UNASSIGNED: Background   To examine the results of myectomy and mitral valve surgery for systolic anterior motion (SAM) of the mitral valve and @entity3585 ( @entity3585 ) with a relatively thin interventricular septum. Methods   The subjects were 12 @entity1 with SAM and @entity3585 . Eight had @entity1121 ( @entity1121 ) with a mean interventricular septal thickness of 16 mm. Three had sigmoid septum and one had an unknown etiology. For @entity1121 , isolated extended myectomy was performed when @entity339 was mild (n   =   1) and extended myectomy plus mitral valve surgery was performed when @entity339 was more than mild (n   =   4) or primary valve etiologies existed (n   =   3). Myectomy was performed for the three cases with sigmoid septum. Myectomy plus height reduction of the posterior mitral leaflet was performed for the one case with the unknown etiology of SAM. Results   In the @entity1 with @entity1121 , the maximum LVOT pressure gradient significantly decreased from 140        18 to 16        6 and 3        3   mm Hg, while @entity339 significantly decreased from 2.3        0.5 to 0.5        0.3 and 0.4        0.2 at pre-op, early post-op, and last follow-up (3        1 years), respectively. In the other etiologies, the maximum LVOT pressure gradient changed from 56        15 to 25        15 and 5        4   mm Hg; @entity339 changed from 2.0        0.6 to 1.3        0.3 and 1.3        0.8, at pre-op, early post-op, and the last follow-up (3        2 years), respectively. Conclusion   Myectomy with mitral valve surgery is an option for SAM and @entity3585 in @entity1 with a relatively thin interventricular septum.
