ID Number		1311
Study Type		Human / Provocation
Model		64 MHz (MRI) exposure and analysis of heating and physiological changes (hr, bp, breathing, etc)
Details		Human subjects (n = 27) exposed to MRI (~64 MHz) at 1.5 T (RF dose = RF 0, 0.2, or 0.8 W/kg) were monitored for body surface temperature and other physiologic parameters including blood pressure, heart rate, respiration, and axillary temperature measurements. statistically significant increases in temperature were observed at 0.2 W/kg (0.2 +/- 0.1 degree C) and 0.8 W/Kg (+0.5 +/- 0.1 degree C). No significant changes in blood pressure or respiratory rate were observed at any exposure level. At 0.8 W/kg there was a slight increase in heart rate (3 +/- 1.3 beats per minute). With head only scans, physiologic changes were substantially smaller. Although the authors suggest the findings may not be clinically relevant, they urge additional studies in patients with cardiac failure, vascular occlusion, and metallic implants or prostheses.pp
Findings		Effects (only at thermal levels)
Status		Completed With Publication
Principal Investigator
Funding Agency		Private/Instit.
Country		UNITED STATES
References		Kido, DK et al. Am. J. Neuroradiol., (1987) 8:263-266
Comments