What is the cause of heart and brain blood supply deficiency?

Myocardial insufficiency is associated with coronary atherosclerosis, infection, connective tissue disease, trauma, and congenital vascular malformations. Cerebral insufficiency is associated with cerebral atherosclerosis, and myocardial insufficiency directly leads to cerebral insufficiency. Obesity, cervical spondylosis, and irregular life can also induce cerebral insufficiency.