BJA Advance Access originally published online on January 26, 2009
British Journal of Anaesthesia 2009 102(3):385-389; doi:10.1093/bja/aen388
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Effect of brain magnetic resonance imaging on body core temperature in sedated infants and children
1 Department of Anaesthesia, General Intensive Care and Pain Therapy
2 Department of Radiology, Medical University of Vienna, General Hospital, Waehringer Guertel 18-20, A-1090 Vienna, Austria
* Corresponding author. E-mail: anette-marie.machata{at}meduniwien.ac.at
Background: Children undergoing magnetic resonance imaging (MRI) under sedation are at risk of hypo- or hyperthermia. The effect of brain MRI at differing magnetic field strengths on body core temperature in sedated infants and young children has not been reported previously.
Methods: Two groups of 38 infants and children (aged 1 month to 6 yr 5 months) underwent brain MRI for different indications related to cerebral diseases, at 1.5 Tesla (T) and 3 T MRI units, respectively. All patients received deep sedation comprising midazolam, nalbuphine, and propofol. Pre-scan and post-scan temperatures were measured at the right tympanic and at rectal sites. No active warming devices were used during the procedures.
Results: Body core temperature measurements were similar between right tympanic and rectal site before and after the scans. After 1.5 T scans, the median (IQR) increase from pre-scan to post-scan tympanic temperature was 0.2°C (0.1–0.3), and the median (IQR) rectal temperature increase was 0.2°C (0–0.3) (P<0.001). After 3 T scans, the median (IQR) tympanic temperature increase was 0.5°C (0.4–0.7), and the median (IQR) rectal temperature increase was 0.5°C (0.3–0.6) (P<0.001).
Conclusions: Body core temperature increased significantly during 1.5 and 3 T examinations; this increase was more profound during 3 T MRI. Patient heating occurred despite minimal efforts to reduce passive heat loss under sedation and without the use of warming devices.
Keywords: anaesthesia, paediatric; anaesthetic techniques, i.v.; anaesthetics i.v., propofol; brain, magnetic resonance imaging; monitoring, temperature
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