A method and apparatus is provided for heating or cooling at least a selected
portion
of a patient's body. The method begins by inserting a catheter through the urethra
and into the bladder of the patient. A heated or chilled fluid is conducted through
a supply lumen of the catheter and into the bladder. The fluid is evacuated from
the bladder through a return lumen of the catheter. Finally, a quantity of urine
is monitored which flows out of the bladder and through the return lumen of the
catheter. The rate of fluid flowing through the supply lumen of the catheter may
be adjusted in a manner that is based at least in part on the monitored quantity
of urine flowing out of the bladder.
