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Red Cell Quinine Concentrations in Falciparum Malaria
Nicholas J. White
Nicholas J. White
Faculty of Tropical Medicine, Mahidol University, Tropical Medicine Unit, Nuffield Department of Clinical Medicine, University of Oxford, Department of Tropical Medicine, Liverpool School of Tropical Medicine, 420/6 Rajvithi Road, Bangkok 4, Thailand
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Sornchai Looareesuwan
Sornchai Looareesuwan
Faculty of Tropical Medicine, Mahidol University, Tropical Medicine Unit, Nuffield Department of Clinical Medicine, University of Oxford, Department of Tropical Medicine, Liverpool School of Tropical Medicine, 420/6 Rajvithi Road, Bangkok 4, Thailand
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Kamolrat Silamut
Kamolrat Silamut
Faculty of Tropical Medicine, Mahidol University, Tropical Medicine Unit, Nuffield Department of Clinical Medicine, University of Oxford, Department of Tropical Medicine, Liverpool School of Tropical Medicine, 420/6 Rajvithi Road, Bangkok 4, Thailand
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Red cell concentrations of quinine were measured in cerebral malaria and in uncomplicated falciparum malaria both in the acute stage and 1 month after recovery. Red cell quinine elimination half times were significantly shorter than the corresponding plasma half times in cerebral malaria and convalescent uncomplicated cases (P < 0.001), but not in acute uncomplicated cases (P = 0.12). The ratio of red cell:plasma concentration fell progressively from the 2nd day (0.49) to the 6th day (0.26) of treatment. On admission this ratio was positively correlated with the blood parasite count (P = 0.02). Red cell quinine concentration may be relevant to the assessment of drug resistance, and to the design of treatment regimens.
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