The document summarizes research on the impact of autonomic dysfunction on peri-operative cardiovascular complications. It finds that cardiovascular autonomic neuropathy is common in diabetic patients and can lead to haemodynamic instability during anesthesia due to the interplay between the neuropathy and anesthesia's effects on autonomic function. Depending on the type of anesthesia used, autonomic neuropathy can affect peri-operative haemodynamics and postoperative recovery in surgical patients. Pre-operative testing of autonomic function may help reduce cardiovascular complications by identifying patients at risk.