Which temperature monitoring method is described as the most commonly used and as the next best alternative to PA catheter or tympanic measurements?

• A. Esophageal
• B. Tympanic
• C. Oral
• D. Rectal

Answer: (A)

Measuring core temperature during anesthesia relies on a reading that mirrors the body’s central temperature rather than peripheral sites. Esophageal temperature monitoring is the most commonly used method when a pulmonary artery catheter isn’t placed or tympanic measurements aren’t used, because the sensor in the lower esophagus sits near the heart and great vessels, giving a close and fast reflection of core temperature. It’s easy to place in an intubated, anesthetized patient and provides continuous, real-time data, while being relatively stable against changes in ambient room temperature or airway gas compared with tympanic or oral readings. Rectal temperatures can lag behind rapid temperature shifts and may be influenced by stool or irrigation, and tympanic readings can be unreliable due to ear canal issues or external heat sources. Oral measurements are susceptible to breathing patterns and ingestion, reducing accuracy. Overall, esophageal monitoring offers accuracy, rapid responsiveness, and practicality, making it the preferred alternative to PA catheter or tympanic measurements.