Data collected included date of visit, age, species, sex, type (pet, free ranging, or wild kept in captivity), body weight, body condition score, diagnosis, procedure, American Society of Anesthesiologists status, premedication used for anesthesia, drug for anesthetic induction, type of maintenance anesthesia, route and type of fluid administration, volumes of crystalloid and colloid fluids administered, intraoperative events, estimated blood loss, duration of anesthesia, surgery duration, recovery time, recovery notes, whether birds survived to hospital discharge, time of death, total cost of hospitalization, cost of anesthesia, and nadir and peak values for heart rate, end-tidal
partial pressure of carbon dioxide, concentration of inhaled anesthetic, and body temperature.
Standard monitoring in the operating room included electrocardiogram (ECG), non-invasive blood pressure (NIBP), pulse oximetre, end-tidal
carbon dioxide, temperature, precordial stethoscope, end-tidal
concentration of gases and urine output.