[Oximetry in veterinary anesthesia: the continuous determination of mixed venous oxygen saturation in dogs and horses].

This research explores the use of continuous fiberoptical measurement of mixed venous partial oxygen saturation as a valuable diagnostic tool in veterinary anaesthesia for dogs and horses. The technique was particularly helpful in high-risk equine patients, providing insights into the complex changes in pulmonary, cardiac and circulatory function during anaesthesia.

Methodology

• The study utilized continuous fiberoptical measurement to determine the mixed venous partial oxygen saturation in nearly one hundred dogs and horses categorized as high-risk patients.
• This method allows for continuous monitoring of the patient’s oxygen levels, allowing for early detection of any potential risks or complications.
• The technique was especially employed in horses, given that they commonly exhibit disturbances in pulmonary gas exchange and myocardial function during anesthesia, and there are few reliable methods for assessing cardiac output in these animals.

Findings

• The registered data obtained from this methodology formed the foundation for the case reports presented in the study.
• The study found that the mixed venous oxygen saturation could be influenced by various factors such as a disturbance of the arterial oxygen status, insufficient performance of the cardiovascular system, or a change in metabolic activity.
• Mixed venous oxygen saturation, having been found to be influenced by multiple parameters, can only be interpreted in connection with other parameters.
• Through these findings, it’s observed that the mixed venous oxygen saturation provides global information about the whole organism rather than specific data about the oxygen supply to individual organs.
• Despite this limitation of specificity, from personal experience, the researchers noted that this technique reliably indicated deterioration in the patient’s condition at a very early stage.

Significance

• The technique demonstrated potential as a valuable diagnostic tool in veterinary medicine, particularly in the monitoring and management of anaesthesia in high-risk patients.
• It provides practitioners with the ability to measure and monitor the complex changes in a patient’s pulmonary, cardiac, and circulatory function during anaesthesia.
• Further research is required to refine the method and broaden its application across different species and medical scenarios.