Key result
The unwarmed period between induction of anaesthesia and surgical incision led to a mean core temperature decrease of 1.5 degrees C, which correlated significantly with this duration (R2 = 0.6912).
Why the study?
Does the timing of warming methods affect core temperature changes during induction of anaesthesia in patients undergoing elective aortic aneurysm repair?
Observational (n=18)
Does the timing of warming methods affect core temperature changes during induction of anaesthesia in patients undergoing elective aortic aneurysm repair?
Effect estimate: R2 = 0.6912
Significant heat loss occurs during anaesthesia induction for aortic surgery before warming methods are applied, suggesting warming should begin earlier or lines should be placed prior to induction.
Unwarmed post-induction period linked to core temperature drop; supports earlier warming hypothesis but should not change practice without RCTs.
We have studied core temperature changes occurring during induction of general anaesthesia and surgery in 18 patients undergoing elective aortic aneurysm repair. In the operating theatre, all patients were warmed with a forced-air warmer and a warming mattress, and received warmed (37 degrees C) intravenous fluids. Despite this, mean (SD) [range] core temperatures in the anaesthetic room decreased by 1.5 (0.3)[1.1-2.2] degrees C, while intravascular lines, epidural and urinary catheters were inserted before the introduction of warming methods in theatre. In one-third of patients, the core temperature was still below 36 degrees C at the end of surgery. The overall temperature decrease correlated significantly with the duration of time between induction of general anaesthesia and surgical incision (R2 = 0.6912), when the patients were not being warmed. Hypothermia may thus be prevented by minimising the period that the patient is anaesthetised without being warmed. Vascular lines, urinary and epidural catheters should be inserted before the induction of general anaesthesia or, alternatively, warming methods should be introduced in the anaesthetic room.
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Stoneham et al. (2000) conducted an observational in Elective aortic aneurysm repair (n=18). Unwarmed period during induction of anaesthesia was evaluated on Core temperature changes (R2 = 0.6912). The unwarmed period between induction of anaesthesia and surgical incision led to a mean core temperature decrease of 1.5 degrees C, which correlated significantly with this duration (R2 = 0.6912).
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