Results of Tc99m-Maraciclatide Scintigraphy in Subjects With Diabetes Mellitus and Heart Failure With Preserved Left Ventricular Ejection Fraction

Inclusion Criteria: * The subject is between 18 and 80 years of age. * The subject was diagnosed with DM type 2 based upon accepted clinical criteria and currently takes at least one diabetes medication. * For HF subjects: The subject was diagnosed with HF with preserved EF within the previous 1 year, at which time LVEF was determined to be ≥45%. * For comparison subjects: The subject was determined to have diastolic dysfunction on EKG within the previous year and currently has no signs or symptoms of HF. * The subject has been clinically stable for at least 7 days prior to the study imaging procedures (e.g., not experiencing continuing chest pain, hemodynamic instability, worsening HF symptoms, or clinically significant arrhythmia). Exclusion Criteria: * The subject had an acute myocardial infarction within the past 30 days. * The subject had a cardiac revascularization (e.g., percutaneous transluminal coronary angiography \[PTCA\], percutaneous coronary intervention (PCI), or coronary artery bypass graft \[CABG\]) within the past 30 days. * The subject has severe renal dysfunction. * The subject is claustrophobic or has a movement disorder that prevents him/her from lying still in a supine position for up to 20 minutes at a time. * The subject has participated in a research study using ionizing radiation in the previous 12 months.