Dataset Information

A Comparison of Three Quantitative Methods to Estimate G6PD Activity in the Chittagong Hill Tracts, Bangladesh.

ABSTRACT:

Background

Glucose-6-phosphate-dehydrogenase-deficiency (G6PDd) is a major risk factor for primaquine-induced haemolysis. There is a need for improved point-of-care and laboratory-based G6PD diagnostics to unsure safe use of primaquine.

Methods

G6PD activities of participants in a cross-sectional survey in Bangladesh were assessed using two novel quantitative assays, the modified WST-8 test and the CareStart™ G6PD Biosensor (Access Bio), The results were compared with a gold standard UV spectrophotometry assay (Randox). The handheld CareStart™ Hb instrument (Access Bio) is designed to be a companion instrument to the CareStart™ G6PD biosensor, and its performance was compared to the well-validated HemoCue™ method. All quantitative G6PD results were normalized with the HemoCue™ result.

Results

A total of 1002 individuals were enrolled. The adjusted male median (AMM) derived by spectrophotometry was 7.03 U/g Hb (interquartile range (IQR): 5.38-8.69), by WST-8 was 7.03 U/g Hb (IQR: 5.22-8.16) and by Biosensor was 8.61 U/g Hb (IQR: 6.71-10.08). The AMM between spectrophotometry and WST-8 did not differ (p = 1.0) but differed significantly between spectrophotometry and Biosensor (p<0.01). Both, WST-8 and Biosensor were correlated with spectrophotometry (rs = 0.5 and rs = 0.4, both p<0.001). The mean difference in G6PD activity was -0.12 U/g Hb (95% limit of agreement (95% LoA): -5.45 to 5.20) between spectrophotometry and WST-8 and -1.74U/g Hb (95% LoA: -7.63 to 4.23) between spectrophotometry and Biosensor. The WST-8 identified 55.1% (49/89) and the Biosensor 19.1% (17/89) of individuals with G6PD activity <30% by spectrophotometry. Areas under the ROC curve did not differ significantly for the WST-8 and Biosensor irrespective of the cut-off activity applied (all p>0.05). Sensitivity and specificity for detecting G6PD activity <30% was 0.55 (95% confidence interval (95%CI): 0.44-0.66) and 0.98 (95%CI: 0.97-0.99) respectively for the WST-8 and 0.19 (95%CI: 0.12-0.29) and 0.99 (95%CI: 0.98-0.99) respectively for the Biosensor. Hb concentrations measured by HemoCue™ and CareStart™ Hb were strongly correlated (rs = 0.8, p<0.001, mean difference = 0.09 g Hb/dL, 95% LoA: -2.15 to 2.34).

Conclusion

WST-8 and the CareStart™ G6PD Biosensor represent advances in G6PD diagnostics in resource poor settings, but will require further development before clinical deployment. The CareStart™ Hb instrument produced a precise measure of haemoglobin concentration.

SUBMITTER: Ley B

PROVIDER: S-EPMC5266301 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

A Comparison of Three Quantitative Methods to Estimate G6PD Activity in the Chittagong Hill Tracts, Bangladesh.

Ley Benedikt B Alam Mohammad Shafiul MS O'Donnell James J JJ Hossain Mohammad Sharif MS Kibria Mohammad Golam MG Jahan Nusrat N Khan Wasif A WA Thriemer Kamala K Chatfield Mark D MD Price Ric N RN Richards Jack S JS

PloS one 20170125 1

<h4>Background</h4>Glucose-6-phosphate-dehydrogenase-deficiency (G6PDd) is a major risk factor for primaquine-induced haemolysis. There is a need for improved point-of-care and laboratory-based G6PD diagnostics to unsure safe use of primaquine.<h4>Methods</h4>G6PD activities of participants in a cross-sectional survey in Bangladesh were assessed using two novel quantitative assays, the modified WST-8 test and the CareStart™ G6PD Biosensor (Access Bio), The results were compared with a gold stand ...[more]

PMID: 28121993

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Project description:The proportion of Plasmodium vivax malaria among all malarias is increasing worldwide. Treatment with 8-aminoquinolines remain the only radical cure. However, 8-aminoquinolines can cause severe hemolysis in glucose-6-phosphate dehydrogenase (G6PD) deficient patients. The population of the multi-ethnic Chittagong Hill Tracts (CHT) carry the highest malaria burden within Bangladesh. As in many countries the national treatment guidelines recommend 8-aminoquinoline based radical cure without routine G6PD deficiency (G6PDd) testing to guide treatment. Aim of this study was to determine the need for routine testing within a multi-ethnic population by assessing the prevalence of G6PDd among the local population. Participants from 11 ethnicities were randomly selected and malaria status was assessed by microscopy, rapid diagnostic test (RDT) and polymerase chain reaction (PCR). G6PD status was determined by spectrophotometry and G6PD genotyping. The adjusted male median (AMM) was defined as 100% G6PD activity, participants were categorized as G6PD deficient (<30% activity), G6PD intermediate (30% to 70% activity) or G6PD normal (>70% activity). Median G6PD activities between ethnicities were compared and the association between G6PD activity and malaria status was assessed. 1002 participants were enrolled and tested for malaria. G6PD activity was measured by spectrophotometry in 999 participants and host G6PD genotyping undertaken in 323 participants. Seven participants (0.7%) had peripheral parasitaemia detected by microscopy or RDT and 42 by PCR (4.2%). Among 106 participants (32.8%) with confirmed genotype, 99 (93.4%) had the Mahidol variant. The AMM was 7.03U/gHb with 90 (9.0%) G6PD deficient participants and 133 (13.3%) with intermediate G6PD activity. Median G6PD activity differed significantly between ethnicities (p<0.001), proportions of G6PD deficient individuals ranged from 2% to 26% but did not differ between participants with and without malaria. The high G6PDd prevalence and significant variation between ethnicities suggest routine G6PDd testing to guide 8-aminoquinoline based radical in the CHT and comparable settings.

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Project description:BackgroundHow and whether health shocks, care-seeking behaviour and coping strategies are interlinked and influence households resilience to ill-health remains an under-researched subject in the context of Bangladesh. This study investigates whether and how health shocks, care-seeking processes and coping strategies interplay and impact the resilience of extremely poor adivasi (ethnic minority) households in the Chittagong Hill Tracts (CHT), Bangladesh.MethodsOur analysis draws from qualitative data collected through a range of methods (see Additional file 1). We conducted 25 in-depth interviews (IDIs) of two adivasi communities targeted by an extreme-poverty alleviation programme, 11 key informant interviews (KIIs) with project personnel (community workers, field officers, project managers), community leaders, and healthcare providers, and 9 focus group discussions (FGDs) with community members. Data triangulation was performed to further validate the data, and a thematic analysis approach was used to analyze the data.ResultsHealth shocks were a defining characteristic of households' experiences of extreme poverty in the studied region. Care-seeking behaviours are influenced by an array of cultural and economic factors. Households adopt a range of coping strategies during the treatment or care-seeking process, which are often insufficient to allow households to maintain a stable economic status. This is largely due to the fact that healthcare costs are borne by the household, primarily through out-of-pocket payments. Households meet healthcare cost by selling their means of livelihoods, borrowing cash, and marketing livestock. This process erodes their wellbeing and hinders they attempt at achieving resilience, despite their involvement in an extreme poverty-alleviation programme.ConclusionsLivelihood supports or asset-transfers alone are insufficient to improve household resilience in this context. Therefore, we argue that extreme poor households' healthcare needs should be central to the design of poverty-alleviating intervention for them to contribute to foster resilience.

Dataset Information

A Comparison of Three Quantitative Methods to Estimate G6PD Activity in the Chittagong Hill Tracts, Bangladesh.

Background

Methods

Results

Conclusion

Publications

A Comparison of Three Quantitative Methods to Estimate G6PD Activity in the Chittagong Hill Tracts, Bangladesh.

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