A 50-year-old man with familial hyperlipidemia undergoes resection of an abdominal aortic aneurysm. Signs of congestive heart failure develop shortly after surgery. Despite treatment, the patient becomes hypotensive and expires 2 days later. Autopsy reveals marked narrowing of coronary arteries, but without thrombosis. Multiple foci of necrosis are found circumferentially around the inner walls of both ventricles. Which of the following best describes the pathogenesis of necrotic foci in the patient's heart?