A clinical audit of an office-based anaesthesia service for dental procedures in Victoria

There is an increasing number of specialties performing office-based procedures, with many different providers practising in this field. Office Based Anaesthesia Solutions is a private enterprise designed to be a high-quality general anaesthesia and sedation service delivering care across 18 dental practices in Victoria. We undertook a criterion-based audit of our practice standards and outcomes. Following ethics approval, we retrospectively reviewed consecutive patients managed by our service between March 2014 and July 2017. We collected demographic data, information about anaesthesia technique, and surgical features. We assessed our findings against the Australian and New Zealand College of Anaesthetists (ANZCA) day surgery policy documents. During the specified period, we provided anaesthesia or sedation for 1,323 patients. Their ages ranged from two to 93 years (mean [standard deviation] 33.3 [18.6] years). Ninety-three percent of patients were American Society of Anesthesiologists (ASA) physical status classification 1 or 2. Patient demographics were in line with ANZCA day surgical policy documents. Total intravenous anaesthesia was used in 1,054 of the 1,096 documented general anaesthesia cases. There were three unplanned hospital transfers (annual incidence 0.07%). As this was the first Australian criteria-based audit of office-based anaesthesia (OBA) for dental procedures, we cannot compare our findings directly to previous studies. However, we feel that our patient demographics fell within acceptable ANZCA day procedure standards and our adverse event rate was both very low and similar to other published international adverse event rates. Our audit indicates that with careful screening processes, patient selection and medical governance, OBA is a viable model of care for patients undergoing dental procedures.