Evaluation of the Surgical Pleth Index (SPI) for the monitoring of the nociception-antinociception balance in dogs undergoing castration: A prospective clinical trial.

The aim of this prospective clinical study was to evaluate the efficacy of the Surgical Pleth Index (SPI), a validated nociception monitor in human anaesthesia, in dogs. The technology uses a plethysmographic signal from a specific pulse oximetry probe to analyse pulse wave amplitudes and heartbeat intervals. Twenty-six healthy dogs anaesthetised for castration were included.

Evaluation of the nociception-antinociception balance using the Parasympathetic Tone Activity index in dogs anaesthetized for castration.

Objective: To evaluate the performance of the Parasympathetic Tone Activity (PTA) index in assessing the nociception-antinociception balance in anaesthetized dogs undergoing castration.

Study Design: Prospective clinical study.

Animals: A group of 22 healthy client-owned dogs.