Comparison of the effects of hydralazine on tumor and normal tissue blood perfusion by MRI

Purpose : The differential effects on blood perfusion of the vasodilator hydralazine (HYD) between tumor and normal muscle have been measured using the dynamic enhanced-magnetic resonance imaging (DE-MRI) technique. Methods and Materials : DE-MRI is a noninvasive method of determining blood perfusio...

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Veröffentlicht in:International journal of radiation oncology, biology, physics biology, physics, 1994-06, Vol.29 (3), p.473-479
Hauptverfasser: Belfi, Charles A., Paul, Chitta R., Shan, Siqing, Ngo, Frank Q.H.
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Sprache:eng
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Zusammenfassung:Purpose : The differential effects on blood perfusion of the vasodilator hydralazine (HYD) between tumor and normal muscle have been measured using the dynamic enhanced-magnetic resonance imaging (DE-MRI) technique. Methods and Materials : DE-MRI is a noninvasive method of determining blood perfusion in tumors and normal tissues using the MR contrast agent Gd-DTPA. Hydralazine is currently being used in an attempt to increase tumor response to bioreductive agents and to hyperthermia. Results : We show that a dose of 1.2 mg/kg HYD causes an increase in tumor perfusion while doses ≥ 2.5 mg/kg cause a decrease in tumor perfusion. The latter was accompanied by a dose-dependent increase in normal muscle perfusion consistent with the “steal effect.” Conclusion : This study demonstrates the sensitivity of the DE-MRI technique and its capability of providing estimates of blood perfusion in normal and tumor tissue as well as in smaller regions of a solid tumor. Such features would make it clinically useful in the study of tumor response to radiation therapy and chemotherapy in patients.
ISSN:0360-3016
1879-355X
DOI:10.1016/0360-3016(94)90441-3