Septal myectomy is a type of open-heart surgery for thick heart muscle (hypertrophic cardiomyopathy). It decreases symptoms of the condition. A muscular wall called the septum separates the left and ...

Mia’s mother Maddie Dearness was told while she was pregnant that one of her twins girls had multiple ventricular septal defect (VSD) , meaning Mia would be born with multiple holes in her heart.