Survival After Shock Therapy in Implantable Cardioverter-Defibrillator and Cardiac Resynchronization Therapy-Defibrillator Recipients According to Rhythm Shocked The ALTITUDE Survival by Rhythm Study Brian D. Powell, MD,* Leslie A. Saxon, MD,y John P. Boehmer, MD,z John D. Day, MD,x F. Roosevelt Gilliam III, MD,k Paul A. Heidenreich, MD, MS,{ Paul W. Jones, MS,# Matthew J. Rousseau, MS,# David ...