Response to Letter Regarding Article, “Role of Cardiovascular Magnetic Resonance as a Gatekeeper to Invasive Coronary Angiography in Patients Presenting With Heart Failure of Unknown Etiology”

We thank Dr Hamilton-Craig and colleagues for their insightful remarks regarding our work. We concur with their assertion that “the absence of late gadolinium enhancement does not necessarily obviate the need to image coronary arteries,” because a small proportion (0%–7.1%) of patients will have global hibernation secondary to proximal severe coronary artery disease (CAD) without infarction.1,2 In their own study, revascularization in these patients resulted in improved outcome stemming from augmented ventricular function.2 For precisely this reason, our protocol used magnetic …