Reduced erythrocyte survival following clearance of malarial parasitaemia in Thai patients

British Journal of Haematology
S LooareesuwanD J Weatherall

Abstract

Erythrocyte survival times were measured in healthy Thai controls and in patients following clearance of asexual P. falciparum or P. vivax parasitaemia. In five controls the mean cell life (MCL) of compatible donor erythrocytes was 89.6 d (mean range 73-101 d) compared with a mean MCL of 56.8 d (range 30-66 d) for autologous erythrocytes in 12 falciparum patients. In one of these patients the survival curve was biphasic with a rapid loss of some labelled cells. The survival of compatible donor erythrocytes was also studied in 10 patients and two types of survival curve could be distinguished. In five patients the cells had a mean MCL of 64.4 d (range 42-90 d). In the others survival curves were curvilinear, suggesting a complex mechanism of cell clearance or the presence of more than one cell population. There was initially a more rapid rate of destruction. In P. vivax malaria the MCL of autologous erythrocytes in seven patients was a mean of 67.2 d (range 34-74 d) and that of compatible donor cells in six patients was 66.8 d (range 54-76 d). In all except one of these patients both autologous and donor cell survival curves could be fitted to straight lines. No increase in cell-bound IgG or C3 was evident in 12 patients tested....Continue Reading

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