If you are looking for a good survey of current practices in the treatment of HCM, a recent article published in the journal Structural Heartby Dr. Ahmad Masri and the team at Oregon Health and Sciences University (OHSU) provides an informative overview of thirty controversies and considerations in the treatment of HCM. This article explains in some detail how the doctors at this HCM Center approach these situations.
As reported in this New York Times article, radiation has been used as a successful treatment in five patients with ventricular arrhythmias who had previously failed standard treatment using catheter radiofrequency ablation. The complete study was published last week in the New England Journal of Medicine.