Beta-blockers, calcium channel blockers, angiotensin converting enzyme inhibitors and angiotensin receptor blockers: should they be stopped or not before ambulatory anaesthesia?

Patients should continue to take beta-blockers and calcium channel blockers on the day of surgery. Continuing angiotensin converting enzyme (ACE) inhibitors and angiotensin receptor blockers increases the likelihood of intraoperative hypotension. This can be reduced by withholding these drugs, but will also respond to simple treatments without any apparent adverse outcomes. It may therefore simplify instructions to patients if they are told to take all cardiac medications as normal.