Myocardial blood flow (MBF) (MBF)

Myocardial blood flow (MBF) refers to the rate of blood delivery to the heart muscle, which is essential for providing the oxygen and nutrients required for cardiac contraction and metabolic homeostasis (StatPearls: Physiology, Coronary Artery). Under normal conditions, MBF is closely coupled to myocardial oxygen consumption and is regulated by mechanisms such as metabolic vasodilation, myogenic autoregulation, and endothelial-derived factors like nitric oxide (PubMed: 23677104). Impairment of MBF, often due to obstructive coronary artery disease or microvascular dysfunction, leads to myocardial ischemia, angina, and potentially myocardial infarction (NIH: Heart, Lung, and Blood Institute). While MBF is a physiological process rather than a specific molecular target like a receptor or enzyme, it serves as a critical clinical endpoint and a measure of therapeutic efficacy in cardiovascular medicine. Pharmacological interventions, including nitrates, calcium channel blockers, and beta-blockers, aim to optimize MBF by either increasing coronary supply through vasodilation or decreasing myocardial demand (StatPearls: Antianginal Medications). Advanced imaging modalities, such as Positron Emission Tomography (PET) and Cardiac Magnetic Resonance (CMR), are used to quantify MBF in clinical and research settings to assess cardiovascular health and guide treatment (PubMed: 27562080).

Other names

Coronary blood flowMyocardial perfusionCardiac blood flow

Drugs modulate myocardial blood flow by inducing coronary vasodilation, reducing vascular resistance, or decreasing myocardial oxygen demand through negative inotropic and chronotropic effects (StatPearls: Coronary Artery Disease).