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2015 ; 13
(ä): 227
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Artemether-lumefantrine treatment of uncomplicated Plasmodium falciparum malaria:
a systematic review and meta-analysis of day 7 lumefantrine concentrations and
therapeutic response using individual patient data
#MMPMID26381375
ä
BMC Med
2015[Sep]; 13
(ä): 227
PMID26381375
show ga
BACKGROUND: Achieving adequate antimalarial drug exposure is essential for curing
malaria. Day 7 blood or plasma lumefantrine concentrations provide a simple
measure of drug exposure that correlates well with artemether-lumefantrine
efficacy. However, the 'therapeutic' day 7 lumefantrine concentration threshold
needs to be defined better, particularly for important patient and parasite
sub-populations. METHODS: The WorldWide Antimalarial Resistance Network (WWARN)
conducted a large pooled analysis of individual pharmacokinetic-pharmacodynamic
data from patients treated with artemether-lumefantrine for uncomplicated
Plasmodium falciparum malaria, to define therapeutic day 7 lumefantrine
concentrations and identify patient factors that substantially alter these
concentrations. A systematic review of PubMed, Embase, Google Scholar,
ClinicalTrials.gov and conference proceedings identified all relevant studies.
Risk of bias in individual studies was evaluated based on study design,
methodology and missing data. RESULTS: Of 31 studies identified through a
systematic review, 26 studies were shared with WWARN and 21 studies with 2,787
patients were included. Recrudescence was associated with low day 7 lumefantrine
concentrations (HR 1.59 (95% CI 1.36 to 1.85) per halving of day 7
concentrations) and high baseline parasitemia (HR 1.87 (95% CI 1.22 to 2.87) per
10-fold increase). Adjusted for mg/kg dose, day 7 concentrations were lowest in
very young children (<3 years), among whom underweight-for-age children had 23%
(95% CI -1 to 41%) lower concentrations than adequately nourished children of the
same age and 53% (95% CI 37 to 65%) lower concentrations than adults. Day 7
lumefantrine concentrations were 44% (95% CI 38 to 49%) lower following
unsupervised treatment. The highest risk of recrudescence was observed in areas
of emerging artemisinin resistance and very low transmission intensity. For all
other populations studied, day 7 concentrations ?200 ng/ml were associated with
>98% cure rates (if parasitemia <135,000/?L). CONCLUSIONS: Current
artemether-lumefantrine dosing recommendations achieve day 7 lumefantrine
concentrations ?200 ng/ml and high cure rates in most uncomplicated malaria
patients. Three groups are at increased risk of treatment failure: very young
children (particularly those underweight-for-age); patients with high
parasitemias; and patients in very low transmission intensity areas with emerging
parasite resistance. In these groups, adherence and treatment response should be
monitored closely. Higher, more frequent, or prolonged dosage regimens should now
be evaluated in very young children, particularly if malnourished, and in
patients with hyperparasitemia.
|Antimalarials/administration & dosage/*therapeutic use
[MESH]