Effect of MRI strength and propofol sedation on pediatric core temperature change.

PURPOSE

To determine core body temperature variations in children undergoing MRI exams on 1.5 Tesla (T) and 3T magnetic field strengths and with and without propofol sedation.

MATERIALS AND METHODS

Temporal artery temperatures were prospectively collected on 400 consecutive patients undergoing 1.5 Tesla (T) or 3.0T MRI scans. A cumulative logistic regression model was created using age, weight, MRI protocol, sedation status, pre-MRI temperature and MRI strength to assess risk of temperature change.

RESULTS

For patients with complete pre- and post-MRI temperature data, mean temperatures did not significantly change (-0.0155°C, 95%CI, -0.035, 0.064; n = 385). Temperature changes differed significantly between propofol-sedated and nonsedated patients (-0.26°C ± .44 versus 0.24°C ± 0.42; P < 0.0001), as did temperature changes for patients on the 3T (0.076°C ± 0.52) versus 1.5T (-0.06°C ± 0.48; P = 0.011). Sedation status, age, MRI strength, and MRI protocol accounted for 44.17% of temperature variance. The temperatures of 15 patients' (3.9%) decreased >1°C; 12 were on the 1.5T. All 7 patients (1.8%) who increased >1°C were non-sedates.

CONCLUSION

Clinically significant core body temperature change is uncommon in children undergoing MRI with different magnetic field strengths, and with and without propofol sedation.