Preventive chemotherapy reverses covert, lymphatic associated tissue change in young people with lymphatic filariasis in Myanmar

Douglass, Janet, Dykes, Lukah, Kelly-Hope, Louise, Gordon, Susan, Leggat, Peter, Aye, Ni Ni, Win, San San, Wai, Tint, Win, Yi Yi, Nwe, Thet Wai, and Graves, Patricia (2019) Preventive chemotherapy reverses covert, lymphatic associated tissue change in young people with lymphatic filariasis in Myanmar. Tropical Medicine and International Health, 24 (4). pp. 463-476.

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Objectives This longitudinal comparative study investigated the effect of preventive chemotherapy (PC) on covert tissue changes associated with lymphatic filariasis (LF) among young people living in an LF-endemic area in Myanmar.

Methods Tissue compressibility and extracellular free fluid in the lower limbs of people aged 10– 21 years were measured using indurometry and bioimpedance spectroscopy (BIS). Baseline measures were taken in October 2014, annual mass drug administration (MDA) of PC was delivered in December, and in March 2015 further PC was offered to LF-positive cases who had missed MDA. Follow-up measures were taken in February and June 2015.

Results A total of 50 antigen‐positive cases and 46 antigen‐negative controls were included. Self‐reported PC consumption was 60.1% during 2014 MDA and 66.2% overall. At second follow‐up, 24 of 34 cases and 27 of 43 controls had consumed PC. Significant and clinically relevant between‐group differences at baseline were not found post‐PC. Bayesian linear mixed models showed a significant change in indurometer scores at both calves for antigen‐positive cases who consumed any PC (dominant calf: −0.30 [95% CI −0.52, −0.07], P < 0.05 and non‐dominant calf: −0.35 [95% CI −0.58, −0.12], P < 0.01). Changes in antigen‐negative participants or those not consuming PC were not significant.

Conclusion This study is the first attempt to use simple field‐friendly tools to track fluid and tissue changes after treatment of asymptomatic people infected with LF. Results suggested that PC alone is sufficient to reverse covert lymphatic disturbance. Longer follow‐up of larger cohorts is required to confirm these improvements and whether they persist over time. These findings should prompt increased efforts to overcome low PC coverage, which misses many infected young people, particularly males, who are unaware of their infection status, unmotivated to take PC and at risk of developing lymphoedema. Indurometry and BIS should be considered in assessment of lymphatic filariasis‐related lymphedema.

Item ID: 57069
Item Type: Article (Research - C1)
ISSN: 1365-3156
Keywords: lymphedema, lymphatic filariasis, preventive chemotherapy, mass drug administration,global programme to eliminate lymphatic filariasis, lower extremity, indurometry, bioimpedance, spectroscopy
Copyright Information: © 2019 The Authors. Tropical Medicine & International Health Published by John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
Funders: [private funding through crowdfunding campaigns], James Cook University, Impedimed Australia, GlaxoSmithKline
Date Deposited: 04 Sep 2019 02:07
FoR Codes: 42 HEALTH SCIENCES > 4206 Public health > 420604 Injury prevention @ 30%
42 HEALTH SCIENCES > 4203 Health services and systems > 420318 People with disability @ 30%
42 HEALTH SCIENCES > 4206 Public health > 420605 Preventative health care @ 40%
SEO Codes: 92 HEALTH > 9202 Health and Support Services > 920201 Allied Health Therapies (excl. Mental Health Services) @ 30%
92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920403 Disability and Functional Capacity @ 30%
92 HEALTH > 9204 Public Health (excl. Specific Population Health) > 920499 Public Health (excl. Specific Population Health) not elsewhere classified @ 40%
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