Pulse oximetry and capnometry.

Respiratory dysfunction is common in veterinary patients and various techniques have been developed to rapidly and accurately monitor pulmonary gas exchange. Pulse oximetry and capnometry are tools that allow for continuous evaluation of pulmonary function. Methodology, indications, and limitations of pulse oximetry and capnometry are discussed in this article. Both techniques are useful for monitoring critically ill or anesthetized patients; however, limitations to their use exist which underscore the need for intermittent arterial blood gas analysis.