Delayed haemolysis after artesunate — DTM&H MCQ

Correct answer: B — Haemolysis screen with repeat full blood count monitoring

The correct answer is B, haemolysis screen with repeat full blood count monitoring. This presentation, a falling haemoglobin with rising bilirubin and negative films two to three weeks after intravenous artesunate for severe falciparum malaria, is classic post-artesunate delayed haemolysis (PADH). UK guidance recognises this as an established complication occurring roughly 7 to 21 days after artesunate, particularly in patients with high pretreatment parasitaemia, and recommends haemoglobin checks around 14 days post treatment specifically to catch this. The negative film excludes recrudescent parasitaemia as the cause of anaemia, and the biochemical pattern (falling Hb, raised bilirubin) points to ongoing haemolysis of the pitted, once-infected erythrocytes rather than treatment failure, so the appropriate step is a haemolysis screen (reticulocytes, LDH, haptoglobin, blood film for red cell morphology, direct antiglobulin test) with serial FBC to monitor severity and need for transfusion. Why the other options are wrong: A. Stool microscopy for occult hookworm infection: hookworm causes chronic iron-deficiency anaemia, not an acute haemolytic-pattern fall in Hb with raised bilirubin three weeks after severe malaria treatment; the timeline and biochemistry do not fit. C. Routine malaria antibody titre: serology has no role in acute management or in diagnosing haemolysis, and does not explain or investigate the current anaemia; films remain the correct test for active infection and are already negative. E. Immediate lumbar puncture for cerebral malaria relapse: there is no neurological deficit or reduced consciousness described, and cerebral malaria does not recur after adequate parasite clearance with negative films; LP is not indicated and carries unnecessary risk. D. CT pulmonary angiography: there are no symptoms or signs suggesting pulmonary embolism (no chest pain, dyspnoea, hypoxia), and this fall in Hb with hyperbilirubinaemia is a haemolytic, not thromboembolic, picture. Key point: a falling Hb with raised bilirubin and negative films 1 to 3 weeks after intravenous artesunate for severe malaria is post-artesunate delayed haemolysis until proven otherwise, warranting a haemolysis screen and serial FBC.

Reference: UK Malaria Treatment Guidelines Writing Group, Journal of Infection 2016; 72(6):635-649 (PHE/UK malaria treatment guidelines), section on artesunate and delayed haemolysis: haemoglobin should be checked approximately 14 days after completing artesunate due to delayed haemolysis occurring in 10-15% of patients 7-21 days post-treatment. Available via PMC: https://pmc.ncbi.nlm.nih.gov/articles/PMC7132403/