Coronary Sinus Reducer For The Management Of Symptomatic Heart Failure With A Preserved Ejection Fraction Associated With Coronary Microvascular Dysfunction

Inclusion Criteria: * Able to provide written informed consent and willing to participate in all required study follow-up assessments * Clinical indicated coronary angiography with invasive CRT testing or PET with CRF assessment prior to enrollment. Abnormal CFR of ≤ 2.5 or PET CFR ≤ 2.0 * Symptomatic HFpEF defined by (PAWP\>15mmHg at rest and /or PAWP\>25 mmHg on exertion) during clinically performed Right heat catheterization with exercise performed prior to enrollment or during screening visit (if not performed clinically ). * Non-Obstructive CAD (≤ 50% stenosis in epicardial vessels and/o…