Method and device for patient temperature control employing optimized rewarming
Embodiments of the invention provide a system for temperature control of the human body. The system includes an indwelling catheter with a tip-mounted heat transfer element. The catheter is fluidically coupled to a console that provides a heated or cooled heat transfer working fluid to exchange heat with the heat transfer element, thereby heating or cooling blood. The heated or cooled blood then heats or cools the patient's body or a selected portion thereof. In particular, strategies for optimizing the rewarming of patients for various medical procedures are provided, including stroke, neurosurgery, and myocardial infarction.
1. A method of rewarming a patient following neurosurgery comprising:
draping a patient with a blanket;
inserting a heat transfer element into a vein of the patient, wherein the heat transfer element includes at least two heat transfer segments separated by a bellows;
circulating a working fluid through the heat transfer element, the working fluid heated by a heat exchanger to a temperature sufficient to raise the temperature of a blood stream to a temperature less than about 42° C.;
sensing a patient temperature;
controlling the patient temperature to a target temperature of less than about 35° C.; and
rewarming the patient to normothermia using a heating blanket, wherein the heat transfer element includes a straight lumen surrounded by a helical lumen.
2. The method of claim 1 , wherein the heat transfer element is flexible and is made of a polymer.
3. The method of claim 1 , wherein the sensing a patient temperature includes sensing a patient temperature with an esophageal probe.
4. A method of rewarming a patient following a stroke comprising:
covering a patient with a heating blanket set to a temperature of between about 38° C. and 43° C.;
inserting a heat transfer element into a vein of the patient, wherein the heat transfer element includes at least two heat transfer segments separated by a bellows;
circulating a working fluid through the heat transfer element;
sensing a patient temperature;
controlling the patient temperature such that the patient temperature rises to greater than about 36° C. over a period of time between about 6 hours to about 24 hours;
if the patient is experiencing shivering during the controlled rewarm, administering an antishivering drug; and
rewarming the patient to normothermia using the active heating blanket, wherein the heat transfer element includes a straight lumen surrounded by a helical lumen.
5. The method of claim 4 , wherein the heat transfer element is flexible and is made of a polymer.
6. A method of rewarming a patient following a cardiovascular surgery, comprising:
inserting a heat transfer element into a vein of the patient wherein the heat transfer element includes at least two heat transfer segments separated by a bellows;
performing a cardiac surgery;
following the cardiac surgery, circulating a working fluid through the heat transfer element, the working fluid heated by a heat exchanger to a temperature sufficient to raise the blood temperature to a blood temperature less than about 42° C.;
sensing a patient temperature;
controlling the patient temperature such that the patient temperature rises to greater than about 36.5° C.
7. The method of claim 6 , wherein the sensing a patient temperature includes sensing a patient temperature with an esophageal probe.
8. The method of claim 6 , wherein the sensing a patient temperature includes sensing a patient temperature with a bladder probe.