"More than 300 million patients have surgery annually worldwide and an increasing proportion of them are elderly and at risk of perioperative adverse events. There's very few proven primary or secondary prevention measures, and the resources for monitoring and trading complications are inadequate. So - more action is required".

This piece looks at the evidence as regards perioperative outcomes for the elderly, depth of anesthesia and mortality. Also, what's the latest on depth of anesthesia and delirium?

Presented by Kate Leslie, Honorary Professor, Monash University, Melbourne, VIC, Australia, Specialist Anaesthetist, The Royal Melbourne Hospital & North Western Mental Health and Non-Executive Director, Australian Medical Council.