A rotational atherectomy is a type of interventional coronary procedure to help open coronary arteries blocked with more calcified material and restore blood flow to the heart. This procedure utilizes a high speed rotational "burr" that is coated with microscopic diamond particles. It rotates at high speed (approximately 200,000 rpm), breaking up blockages into very small fragments (smaller than red blood cells) which can pass, harmlessly, into the circulation. Often angioplasty/stent
is performed after rotational atherectomy to improve the results.