Clinical Research Directory

Inclusion Criteria: * Male and female patients ages 18 and over scheduled by conventional criteria (symptomatic impairment of cardiac function with broadened QRS) for clinical CRT procedures at NYULMC. * Normal kidney function as determined by GFR levels. Inclusion Criteria for Controls * Normal kidney function as determined by GFR levels * No significant cardiovascular disease or risk factors. Exclusion Criteria: * electrical implants such as cardiac pacemakers or perfusion pumps * ferromagnetic implants such as aneurysm clips, surgical clips, prostheses, artificial hearts, valves with steel parts, metal fragments, shrapnel, tattoos near the eye, or steel implants * ferromagnetic objects such as jewelry or metal clips in clothing (which will be removed) * pre-existing medical conditions including a likelihood of developing seizures or claustrophobic reactions, and any greater than normal potential for cardiac arrest.