Use of nitroprusside to increase tissue temperature during local hyperthermia in normal and tumor-bearing dogs.

Published

Journal Article

The present study investigates the effects of nitroprusside, a potent vasodilating agent, on tissue temperature during local hyperthermia in five normal and five tumor-bearing dogs. Caudal thigh muscles were heated in normal dogs and muscle temperatures were recorded during hyperthermia. Tumor-bearing dogs received two hyperthermia treatments during a course of radiation therapy. Temperatures were recorded in tumor and surrounding normal tissues. Mean arterial pressure was decreased by approximately 40-45% during nitroprusside infusion and was associated with a compensatory increase in heart rate and increases in tissue temperature. In normal dogs, muscle temperatures increased an average of 1.7 degrees C with nitroprusside administration. When nitroprusside was administered at the beginning of local hyperthermia to induce step-down heating, approximately 48% of the measured positions in caudal thigh muscle achieved a temperature greater than or equal to 43 degrees C, sufficient to induce step-down heating, during the hyperthermia episode. In tumor-bearing dogs, there was a significant increase in tumor and normal tissue temperatures during nitroprusside administration. Estimated T90 and T50 descriptors increased by 0.9 degrees C and 1.6 degrees C, respectively, for tumor tissue and by 0.4 degrees C and 1.2 degrees C, respectively, for normal tissue. Despite the increase in normal tissue temperatures no toxicity was observed in these dogs. Nitroprusside may be a useful agent for manipulation of tumor temperatures during the entire hyperthermia treatment or for a short time period at the initiation of treatment to induce step-down heating.

Full Text

Duke Authors

Cited Authors

  • Prescott, DM; Samulski, TV; Dewhirst, MW; Page, RL; Thrall, DE; Dodge, RK; Oleson, JR

Published Date

  • 1992

Published In

Volume / Issue

  • 23 / 2

Start / End Page

  • 377 - 385

PubMed ID

  • 1587759

Pubmed Central ID

  • 1587759

International Standard Serial Number (ISSN)

  • 0360-3016

Digital Object Identifier (DOI)

  • 10.1016/0360-3016(92)90756-8

Language

  • eng

Conference Location

  • United States