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Audit, research and guideline update
A UK-based resource to support the monitoring and safe use of anti-TB drugs and second-line treatment of multidrug-resistant TB
  1. J L Potter1,
  2. T Capstick2,
  3. W M Ricketts3,
  4. N Whitehead4,
  5. O M Kon5
  1. 1Department of Respiratory Medicine, Barts Health NHS Trust, London, UK
  2. 2Department of Medicines Management and Pharmacy Services, Leeds University Hospitals Trust, Leeds, UK
  3. 3Department of Respiratory Medicine, The Whittington Hospital, London, UK
  4. 4Department of Respiratory Medicine, Queen Alexandra Hospital, Portsmouth, UK
  5. 5Imperial College London, Chest and Allergy Clinic, London, UK
  1. Correspondence to Dr Jessica Louise Potter, Department of Respiratory Medicine, London Chest Hospital, Bonner Road, London E2 9JX, UK; Jessica.keal{at}gmail.com, Jessica.potter{at}bartshealth.nhs.uk

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Clinical context

Multidrug-resistant TB (MDR-TB) is caused by bacteria that do not respond to the two most powerful anti-TB drugs; isoniazid and rifampicin. MDR-TB is a growing concern; the WHO estimates that there were 450 000 new cases of MDR-TB in 2012 and global incidence almost doubled in that same year.1 In the UK, MDR-TB cases have nearly tripled over the last decade and we continue to discover cases of XDR-TB2; defined as TB that is resistant to both isoniazid and rifampicin (MDR-TB) plus a fluoroquinolone and at least one of the injectable agents (amikacin, capreomycin, kanamycin).

The cost of treatment for MDR-TB is estimated to be 10 times that of fully sensitive TB.3 Treatment regimens are complex and prolonged with a high risk of serious adverse drug reactions (ADRs). Treatment is associated with significant morbidity and mortality, threatening adherence4 and increasing the risk of transmission of these difficult to treat strains of TB. The Global plan to Stop TB aims for successful treatment completion in 75% for all patients with MDR-TB; however, completion rates for MDR-TB in the UK were below this target at only 70.6% for the period between 2004 and 2007.5

We are not aware of any previous guidelines in the UK that have adequately advised clinicians on the baseline testing that should be performed and how to ensure that anti-TB drugs are used safely and effectively in patients treated for drug-resistant TB. We would like to introduce the first UK guidance for adverse-effect monitoring in MDR-TB.

Target audience

The guidance is aimed at all healthcare workers in the field of TB and in particular those who work with MDR-TB. It is relevant not only to UK practitioners but those working with MDR-TB around the world. This guideline is to aid monitoring for adverse effects during the treatment of MDR-TB. It is not a treatment guide or a guide for monitoring the progress of treatment. Treatment of MDR-TB is complex and users of this guidance should ensure all aspects of treatment are in consultation with local experts and published guidance.

Scope of the guidance

The guidance consists of two main sections. The first, ‘Baseline and generic tests for adverse effects monitoring in patients being treated for MDR-TB’, provides advice on the frequency of monitoring that should occur at minimum in all patients on MDR-TB treatment (box 1).

Box 1

Baseline and routine monitoring recommendations

Baseline tests and ongoing monitoring recommendations for adverse effects monitoring

  • Blood tests

  • Audiology

  • Visual acuity and colour discrimination testing

  • ECG

The second section includes ‘drug monographs’ for all drugs currently used to treat MDR-TB, including amikacin, bedaquiline, capreomycin, clarithromycin, clofazamine, co-amoxiclav, cycloserine, ethambutol, imipenem-cilastatin, isoniazid, levofloxacin, linezolid, meropenem, moxifloxacin, ofloxacin, P-aminosalicylic acid, prothionamide, pyrazinamide, rifabutin, rifampicin, streptomycin and thioacetazone. Each monograph was based upon a standard layout as is shown in box 2.

Box 2

Standard layout of each ‘drug monograph’

Individual drug monographs

  • Dosage

  • Preparations

  • Drug level monitoring

  • Adverse effects

  • Adverse effect monitoring recommendations

  • Interactions

  • Contraindications and cautions

  • Laboratory information

Methodology

This document was written using the best available published evidence and, where this was limited, expert consensus. The guideline team consists of five health professionals with experience treating patients with TB and MDR-TB; a TB pharmacist, a TB consultant physician, two respiratory registrars and a TB nurse.

An initial review of published guidelines was undertaken, which allowed us to identify gaps in knowledge and to gain an overview of current practice. To produce the individual drug monographs, a two-step approach was taken. Tertiary reference sources, published reviews and international guidelines were analysed to provide the basis for individual drug monographs since these have collated data from robust clinical and pharmacokinetic studies. This was supported and enhanced by a literature review using Medline and hand searching of reference lists from published studies. The latter strategy was particularly important where there was a paucity of published data to support recommendations. One individual reviewed the abstracts from each search to identify potentially relevant studies. On occasion systematic reviews suggested a dosing range rather than specific doses, and in this situation, expert consensus was used to guide our dose recommendations. Where there was no clear evidence, current practice, our own experience and expert consensus were used.

Our multidisciplinary guideline development group held regular teleconferences and corresponded by email. When evidence was sparse, expert consensus was sought from the British Thoracic Society TB Special Advisory Group (SAG) and UK MDR-TB Advisory Service. When other specialty input was required, this was sought from experts in that field. Once the guideline was developed, it was submitted to the TB SAG for peer review. Feedback was reviewed by the committee and accepted or rejected based on supporting evidence and/or expert consensus.

Online access and future developments

This guidance is designed to be available as an online resource so that it can be updated when the need arises, such as when new drugs are launched or when new data that affect the use of existing anti-TB drugs become available. The guidance has been published online at http://www.tbdrugmonographs.co.uk and will be freely accessible to all.

In addition to this web version, software is being developed to facilitate the ease of use of the guidance. This application will enable the monitoring guidance to be customised for individual patients based on their specific drug regimen. This will also be made available through the website.

New literature will be reviewed annually and incorporated where relevant. Additionally, an open invitation for feedback is incorporated into the website and within the guidance document. Any feedback received will be discussed among the guideline team with any required changes incorporated into the relevant monographs.

Audit and research recommendations

Audit of this guidance is suggested after it has been implemented in a centre for a reasonable period of time; we suggest 6–12 months. Results will be used to revise recommendations and assess impact on treatment outcomes, costs and patient experience.

Conclusions

We hope that by introducing a guideline to aid ADR monitoring in MDR-TB treatment we can improve treatment adherence, morbidity and mortality and reduce treatment costs.

References

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