Are there grounds for a medical malpractice suit?

My 83 yr old mother was offered an outpatient surgery by a cardiologist to gain better use of her left arm. She had a blockage in the subclavian arterty, causing occasional dropping of objects. Advised there are risks in any surgery, no 100% guarantee, but Dr recommended the surgery to improve quality of life, not quantity. Procedure was unsuccesful, stated he had never seen so much plaque in an artery. Family noticed slurred speech and patiend reported no feeling in arm/face as soon as she woke, after several complaints she was found to have had a stroke, caused by plaque during procedure, due to the length of time (6hr window) they did not get her to a facility to reverse the stroke in time. She will now require assisted living, and formerly was independent in apartment and driving. - Is this your question? Add additional information