Ans to this question don't refer the ans bcoz has something else as the ans you refer standard textbook to ans this question
Reading File
Finding Sources
Reading File
Finding Sources
The textbook gives a clear answer. Here is the explanation:
Answer: 3. Rectum
The correct answer is Rectum — rectal temperature is not routinely used for core temperature monitoring during general anesthesia.
What the Standard Textbook Says
From the Sabiston Textbook of Surgery (Temperature Monitoring section):
"Esophageal temperature is most commonly measured during general anesthesia, as it reflects core temperature. Other common sites of temperature monitoring include nasopharynx, bladder (via Foley catheter), axillary, cutaneous, rectal, tympanic membrane, and, in patients with pulmonary artery catheters (PACs), the pulmonary artery."
Why Each Option is or Isn't Routinely Used:
| Site | Used for Core Temp? | Notes |
|---|---|---|
| Pulmonary artery | ✅ Yes | Gold standard for true core temp; used when a PAC is already placed |
| Distal esophagus | ✅ Yes | Most commonly used during GA; very accurate core temp reflection |
| Rectum | ❌ Not routinely | Lags behind actual core temp changes; risk of perforation; impractical intraoperatively |
| Tympanic membrane | ✅ Yes | Reflects hypothalamic/brain temperature; used regularly |
Key Point
The rectum is listed as a site but is not routinely used during general anesthesia because:
- Rectal temperature lags behind true core temperature changes (slow equilibration)
- It is inaccessible in many operative positions
- There is a risk of rectal perforation
- It does not reliably reflect rapid changes in core body temperature
The distal esophagus is the preferred intraoperative site, followed by nasopharynx and bladder. The pulmonary artery is the reference standard when a PA catheter is already in place.
Answer: 3 (Rectum) — Sabiston Textbook of Surgery, Temperature Monitoring
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