Cardiac resynchronization therapy (CRT) and implantable cardioverter defibrillators (ICDs) can help optimize heart failure management. CRT improves symptoms, reduces hospitalizations, and increases survival in patients with reduced ejection fraction, left bundle branch block, and wide QRS duration. ICDs prevent sudden cardiac death in high-risk patients with prior heart failure, low ejection fraction, or history of dangerous arrhythmias. New devices use adaptive and multi-point pacing to better resynchronize the left ventricle. Device therapy improves outcomes when guided by clinical evidence and used in appropriate heart failure patients.