Investigating the Utility of Remote Index of Microvascular Resistance in Patients With Chronic Total Occlusion

Exclusion Criteria

• •subjects with a pacemaker or implantable cardioverter defibrillator
• •contraindication to cardiac MRI, adenosine, heparin, or nitroglycerin
• •cardiac transplantation
• •Estimated glomerular filtration rate (eGFR) ≤ 30 mL/min/1.73m2, given the risk of contrast-induced nephropathy (CIN) and nephrogenic systemic fibrosis (NSF) associated with iodinated and gadolinium-based contrast agents, respectively, in patients with significant renal dysfunction
• •Women who may potentially be pregnant will receive a pregnancy test and be excluded if pregnant
• •Vulnerable populations such as children, college students, prisoners, non-English speakers, and those with diminished decision-making capacity
• •Inability or refusal to consent for the study.