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Drug Non-Adherence And Reasons Among Multidrug-Resistant Tuberculosis Patients In Guizhou, China: A Cross-Sectional Study

Authors Wang Y, Chen H, Huang Z, McNeil EB, Lu X, Chongsuvivatwong V

Received 18 June 2019

Accepted for publication 12 September 2019

Published 30 September 2019 Volume 2019:13 Pages 1641—1653


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Naifeng Liu

Yun Wang,1,2 Huijuan Chen,3 Zhongfeng Huang,4 Edward B McNeil,2 Xiaolong Lu,1 Virasakdi Chongsuvivatwong2

1School of Medicine and Health Management, Guizhou Medical University, Guiyang, Guizhou, People’s Republic of China; 2Epidemiology Unit, Faculty of Medicine, Prince of Songkla University, Hat Yai, Songkhla, Thailand; 3Department of Tuberculosis Prevention and Control, Guizhou Center for Disease Prevention and Control, Guiyang, Guizhou, People’s Republic of China; 4Department of Tuberculosis, Guiyang Public Health Clinical Center, Guiyang, Guizhou, People’s Republic of China

Correspondence: Virasakdi Chongsuvivatwong
Epidemiology Unit, Faculty of Medicine, Prince of Songkla University, 15 Kanchanawanit Road, Hat Yai, Songkhla, Thailand
Tel +66 74 429 754
Fax +66 74 212 900

Purpose: Treatment interruption and incorrect dosage for measuring drug non-adherence have seldom been studied in multidrug-resistant tuberculosis (MDR-TB) treatment. This study aimed to 1) estimate the overall and drug-specific incidence of short (≤14 days) and serious (>14 days) treatment interruption among MDR-TB patients, 2) identify main reasons and predictors for serious interruption, and 3) document the level of agreement of classification for incorrect drug dosage between self-report and pill count.
Patients and methods: A cross-sectional study combining hospital-based interviews and home-based pill count was conducted from January to June 2018. Treatment interruption was determined from patient’s medical records and interviews using a structured questionnaire among 202 patients treated at one designated hospital for MDR-TB treatment. Concordance of pills counted with self-reports for each drug use within one month was assessed for a subgroup of patients at their homes using kappa statistics.
Results: Of 202 patients, the incidence of short and serious treatment interruption was 37.6% and 28.7%, respectively. Adverse drug reactions (ADRs) and financial hardship were the top two reasons for serious interruption. Amikacin and cycloserine had the highest rate of specific drug interruption (18.3% and 10.2%, respectively). ADRs (ORadj: 2.82, 95% CI: 1.41–5.61), monthly out-of-pocket expenses exceeding 250 US dollars (ORadj: 2.27, 95% CI: 1.14–4.50), and baseline co-morbidities (ORadj: 2.53, 95% CI: 1.19–5.38) were significantly associated with serious treatment interruption. Of 111 patients assessed for pill count at home, 5.4% had perfect drug adherence, 54.1% had drug under-use, 6.3% had drug over-use, and 34.2% had both problems. The respective number from self-reports was 7.2%, 56.8%, 5.4% and 30.6%. The two methods gave an acceptable level of agreement for most of the drugs (kappa: 0.52–0.95).
Conclusion: Close monitoring of ADRs, revision of drug regimens, and financial support for MDR-TB in this study population are needed. Self-report on drug under-use and over-use should be monitored monthly in clinical settings.

Keywords: multidrug-resistant tuberculosis, adherence, treatment interruption, Guizhou

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