ABSTRACT
Objective To investigate the risk factors of delayed hemolysis after treatment in patients with malaria .Methods Eighty-nine cases of malaria were retrospectively analyzed .The incidence rate , time from treatment to delayed hemolysis and clinical features of delayed hemolysis after treatment in patients with malaria were investigated .The characteristics of demography ,etiology and laboratory data were compared between delayed hemolysis group and non-delayed hemolysis group .The t test ,χ2 test and Fisher exact test were used for comparison between groups .Results A total of 89 cases of malaria infection were included and 8 cases were diagnosed with delayed hemolysis after treatment among them , with incidence rate of 8 .99% .Patients developed delayed hemolysis after anti-malarial treatment with a median of 7 .5 d and patients recovered from hemolysis after the usage of glucocorticoid with a median of 2 .5 d .The 8 cases were all infected with Plasmodium f alciparum ,and 4 of which had high parasitemia . None of the patients with delayed hemolysis came from epidemic area ,while 28 of the patients without non-delayed hemolysis came from epidemic area .The difference was statistically significant (P=0 .042 , Fisher unilateral exact test) .The average level of minimum hemoglobin was (44 .87 ± 11 .58) g/L in patients with delayed hemolysis ,which was significantly lower than that of non-delayed hemolysis group (108 .35 ± 19 .72) g/L (t= -8 .923 , P< 0 .01) .Conclusion Plasmodium falciparum infection , hyperparasitemia and having no immunity against malaria may be risk factors of delayed hemolysis after treatment .