After inspection, 42.7 and 26.4% of the machines were non-conforming and conforming, respectively, whereas 30.9% could be repaired in situ. A total of 2,001 anesthetic machines and 2,309 vaporizers were studied. To perform statistical analysis, each inspected item was used as predictor, classification and regression trees were built, and a random forest analysis was performed.

If the inspector was able to repair on-site the item malfunctions detected and the machine was fit for use, they issued a final report as вЂњconforming.вЂќ On the contrary, if such malfunctions persisted, the final report was вЂњnon-conforming,вЂќ and a recommendation to remove the machine from service until its final repair was provided.

The anesthetic machine was classified as вЂњconformingвЂќ if all its components were noted as вЂњcorrectвЂќ and no leaks were detected, or as вЂњnon-conformingвЂќ if any of the components was noted as вЂњincorrectвЂќ or if a leak was detected. The vaporizer was classified as вЂњcorrectвЂќ or вЂњincorrectвЂќ when the vaporization error was less than or equal to, or more than 20%, respectively. The vaporizers' performance was evaluated using a self-calibrating gas analyzer. The evaluation of each item was noted as вЂњcorrectвЂќ or вЂњincorrectвЂќ. Inspections were carried out by a team of seven veterinarians, using a human-modified system of checks that was adapted to a veterinary practice. Data was collected between July 2016 and April 2020. The objective of this retrospective study was to review the results of a 4-year audit performed on anesthetic machines and vaporizers used in veterinary clinics in Spain and Portugal.

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