The Authors: Dr. KC Chang, MB, MSc, is a Senior Medical Officer at the Tuberculosis and Chest Service of the Department of Health of Hong Kong SAR. Dr. WW Yew, MB, is one of the Editors-in-Chief of the International Journal of Tuberculosis and Lung Disease and affiliated with the Chinese University of Hong Kong as an Honorary Professor in the Department of Microbiology. Their research interests include various clinical and laboratory aspects of tuberculosis.
INVITED REVIEW SERIES: TUBERCULOSIS: CURRENT STATE OF KNOWLEDGE†
Management of difficult multidrug-resistant tuberculosis and extensively drug-resistant tuberculosis: Update 2012
Version of Record online: 26 DEC 2012
© 2012 The Authors. Respirology © 2012 Asian Pacific Society of Respirology
Volume 18, Issue 1, pages 8–21, January 2013
How to Cite
CHANG, K. .-C. and YEW, W.-W. (2013), Management of difficult multidrug-resistant tuberculosis and extensively drug-resistant tuberculosis: Update 2012. Respirology, 18: 8–21. doi: 10.1111/j.1440-1843.2012.02257.x
SERIES EDITORS: CHI CHIU LEUNG, CHRISTOPH LANGE AND YING ZHANG
- Issue online: 26 DEC 2012
- Version of Record online: 26 DEC 2012
- Accepted manuscript online: 3 SEP 2012 08:46AM EST
- Received 17 August 2012; accepted 22 August 2012
- human immunodeficiency virus;
Multidrug-resistant (MDR) tuberculosis (TB) denotes bacillary resistance to at least isoniazid and rifampicin. Extensively drug-resistant (XDR) TB is MDR-TB with additional bacillary resistance to any fluoroquinolone and at least one second-line injectable drugs. Rooted in inadequate TB treatment and compounded by a vicious circle of diagnostic delay and improper treatment, MDR-TB/XDR-TB has become a global epidemic that is fuelled by poverty, human immunodeficiency virus (HIV) and neglect of airborne infection control. The majority of MDR-TB cases in some settings with high prevalence of MDR-TB are due to transmission of drug-resistant bacillary strains to previously untreated patients. Global efforts in controlling MDR-TB/XDR-TB can no longer focus solely on high-risk patients. It is difficult and costly to treat MDR-TB/XDR-TB. Without timely implementation of preventive and management strategies, difficult MDR-TB/XDR-TB can cripple global TB control efforts. Preventive strategies include prompt diagnosis with adequate TB treatment using the directly observed therapy, short-course (DOTS) strategy and drug-resistance programmes, airborne infection control, preventive treatment of TB/HIV, and optimal use of antiretroviral therapy. Management strategies for established cases of difficult MDR-TB/XDR-TB rely on harnessing existing drugs (notably newer generation fluoroquinolones, high-dose isoniazid, linezolid and pyrazinamide with in vitro activity) in the best combinations and dosing schedules, together with adjunctive surgery in carefully selected cases. Immunotherapy may also have a role in the future. New diagnostics, drugs and vaccines are required to meet the challenge, but science alone is insufficient. Difficult MDR-TB/XDR-TB cannot be tackled without achieving high cure rates with quality DOTS and beyond, and concurrently addressing poverty and HIV.