The effect of rate of heating or cooling prior to heating on tumor and normal tissue microcirculatory blood flow

Issue title: Special Issue for the Fifth International Congress of Biorheology. Part II. Baden-Baden, F.R. Germany, 20–24 August 1983

Guest editors: Alfred L. Copley and Siegfried Witte

Article type: Research Article

Authors: Dewhirst, M.^a | Gross, J.F.^b | Sim, D.^a | Arnold, P.^a | Boyer, D.^a

Affiliations: [a] Division of Radiation Oncology, Arizona Health Sciences Center, Tucson, Arizona 85724 | [b] Department of Chemical Engineering, University of Arizona, Tucson, Arizona 85721

Abstract: Single vessel responses to hyperthermia were studied in tumor and normal tissues using a transparent access window chamber. Rates of heating ⩽ .68°C/minute preserved relatively better vascular function in normal than tumor tissue. A rate of heating of 1.0°C/minute lowered normal tissue stasis temperatures so they were no different from tumor. Cooling to 30°C prior to heating slowed normal arteriolar flows to < 5% of 38°C controls. Heating resulted in increased flow in those vessels, but maximum flows never exceeded 5% of flows achieved in similar vessels which were not cooled first. The implications of this work are that rate of heating and cooling prior to heating can alter normal tissue vascular response to heat in a way that could prove deleterious to maintaining efficient vascular function in that tissue relative to tumor.

Keywords: Microcirculation, Vascular stasis, Heating rate, Tumor, Normal tissue

DOI: 10.3233/BIR-1984-21413

Journal: Biorheology, vol. 21, no. 4, pp. 539-558, 1984