Clinical pharmacology has changed many clinical systems, including anaesthesia delivery in both the hospital and ambulatory surgery settings. Ambulatory surgery centres, also known as outpatient care centres, are facilities that provide same-day healthcare services to patients, which are costeffective and convenient. These facilities can offer surgical care, intervention, and diagnostic and preventative procedures (Figure 1). Ambulatory surgery centres may choose to perform procedures in one specific specialty or instead offer a broad range of services. These facilities are revolutionary because they provide an alternative to hospital-based outpatient services and generally provide favourable patient outcomes. Ambulatory surgery centres have increased across the USA, related to the expansion of minimally invasive and noninvasive procedures and advances in anaesthesia and analgesia with im-
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