Systematic TB screening using WHO radiograph categorisation and care outcomes

BACKGROUND: An appropriate screening approach and quality care are crucial for TB programmes in prisons. This study assessed crude TB prevalence, accuracy of the screening methods and treatment outcomes in a Thai prison.METHOD: This was a retrospective analysis of findings from a mass CXR screening conducted among incarcerated people in July 2017. Digital radiographs were forwarded to a chest physician to read and classify in six categories using WHO categorisation. CXR with significant Categories 3 (no active TB), 4 (not TB), 5 (TB) and 6 (unclassified) abnormalities were eligible for sputum microscopy and Xpert testing. A screening questionnaire locally known as TB-P1 was used for case management. Patients with TB received care in the prison.RESULTS: Of 2,382 prisoners screened, 6.3% had CXR Categories 3-6. Crude prevalence of bacteriologically confirmed TB was 1,133/100,000 (95% CI 748.3-1644.9). The screening´s sensitivity was 96.3% based on CXR Category 5 and 22.2% using TB-P1. Treatment success rates in drug-susceptible and drug-resistant TB patients were respectively 66.7% and 33.3%.CONCLUSION: The WHO radiograph categorisation could be used to screen for TB in the field and may be applied in artificial intelligence for interpreting CXR; screening questionnaires are not effective in prison environments. Nonetheless, low treatment success rates remained a challenge.

Provider-initiated diagnostic HIV counselling and testing in tuberculosis clinics in Thailand

SETTINGS

Twelve large public hospitals geographically distributed in Thailand.

OBJECTIVES

To assess the uptake of diagnostic human immunodeficiency virus (HIV) counselling and testing (DCT), HIV prevalence in tuberculosis (TB) patients and HIV services provided to newly diagnosed HIV-infected TB patients.

METHOD

We provided DCT in TB clinics to newly registered TB patients. Post-test counselling was provided at TB clinics for non-HIV-infected patients and at HIV voluntary counselling and testing centres for HIV-infected patients. HIV-infected patients were referred for HIV-related care during TB treatment.

RESULTS

From July to October 2006, 8% of 1086 new TB patients were known to be HIV-infected at the time of TB diagnosis. Of 1000 patients with unknown HIV status, 93% were tested: HIV infection was diagnosed in 11%. Including patients with previously diagnosed HIV infection, 17% of all TB patients were HIV-infected. Of 99 newly diagnosed HIV patients, 36% received cotrimoxazole prophylaxis. Of 41 with CD4 < 200 cells/microl, 42% began antiretroviral treatment during TB treatment.

CONCLUSION

The acceptance of DCT was high, but the provision of HIV services was disappointingly low. Increased staff capacity building, stronger coordination with the acquired immune-deficiency syndrome programme and better field supervision are needed to achieve universal access to care for HIV-infected TB patients.

HIV testing and care of the patient co-infected with tuberculosis and HIV

Human immunodeficiency virus (HIV) infection poses one of the greatest challenges to tuberculosis (TB) control, with TB killing more people with HIV infection than any other condition. The standards in this chapter cover provider-initiated HIV counselling and testing and the care of HIV-infected patients with TB. All TB patients who have not previously been diagnosed with HIV infection should be encouraged to have an HIV test. Failing to do so is to deny people access to the care and treatment they might need, especially in the context of the wider availability of treatments that prevent infections associated with HIV. A clearly defined plan of care for those found to be co-infected with TB and HIV should be in place, with procedures to ensure that the patient has access to this care before offering routine testing for HIV in persons with TB. It is acknowledged that people caring for TB patients should ensure that those who are HIV-positive are transferred for the appropriate ongoing care once their TB treatment has been completed. In some cases, referral for specialised HIV-related treatment and care may be necessary during treatment for TB. The aim of these standards is to enable patients to remain as healthy as possible, whatever their HIV status.

Care during the continuation phase

As the patient's treatment progresses, symptoms start to disappear and he or she becomes more familiar with the treatment. The standards in this section focus on the types of elements that need to be considered as the patient progresses from the intensive to the continuation phase of tuberculosis (TB) treatment, leading to less contact with the TB service and a resumption of 'normal' activities. Social and psychological as well as physical factors need to be assessed to plan effective care and treatment for the continuation phase. Treatment for TB takes a minimum of 6 months, during which changes to the regimen and personal changes associated with making a recovery can create barriers to continuation of treatment. Lifestyle and other changes that may occur during 6 months of anybody's life can complicate or be complicated by TB treatment. The patient may move to another location at any point during the course of treatment, in which case it may be necessary to transfer his or her care to another TB management unit. This process needs to be carefully managed to maintain contact with the patient and avoid any break in treatment; this is covered by the third standard in this chapter.

Care during the intensive phase: promotion of adherence

The standards in this chapter focus on maximising the patient's ability to adhere to the treatment prescribed. Many people are extremely shocked when they are told they have TB, some refuse to accept it and others are relieved to find out what is wrong and that treatment is available. The reaction depends on many factors, including cultural beliefs and values, previous experience and knowledge of the disease. Even though TB is more common among vulnerable groups, it can affect anyone and it is important for patients to be able to discuss their concerns in relation to their own individual context. The cure for TB relies on the patient receiving a full, uninterrupted course of treatment, which can only be achieved if the patient and the health service work together. A system needs to be in place to trace patients who miss their appointments for treatment (late patients). The best success will be achieved through the use of flexible, innovative and individualised approaches. The treatment and care the patient has received will inevitably have an impact on his or her willingness to attend in the future. A well-defined system of late patient tracing is mandatory in all situations. However, when the rates are high (above 10%), any tracing system will be useless without also examining the service as a whole.

Starting treatment: caring for patients and their families

The standards presented in this section focus on providing physical, social and psychological care for the patient at the point he or she is diagnosed with tuberculosis (TB) and starts treatment. Detailed guidance is included with regard to organising directly observed treatment (DOT) safely and acceptably for both the patient and the management unit. The aim is to give the patient the best possible chance of successfully completing treatment according to a regimen recommended by the World Health Organization. If the health service where the patient is diagnosed cannot offer ongoing treatment and care due to a lack of facilities, overcrowding or inaccessibility, the patient needs to be referred to a designated TB management unit (BMU) elsewhere. The patient may also receive treatment from a facility outside a BMU. However care is organised, it is essential for all patients who are diagnosed with TB to be registered at an appropriate BMU so that their progress can be routinely monitored and programme performance can be assessed. To avoid the risk of losing contact with the patient at any stage of their care, good communication is essential between all parties involved, from the patient him/herself to the person supervising their DOT to the BMU.

Identifying an active case of tuberculosis

The best practice standards set out in chapter 2 of the Best Practice guide focus on the various aspects of identifying an active case of TB and aim to address some of the challenges associated with case detection. The importance of developing a good relationship with the patient from the start, when he or she is often most vulnerable, is emphasised. The first standard focuses on the assessment of someone who might have TB and the second gives detailed guidance about the collection of sputum for diagnosis. The standards are aimed at the health care worker, who assesses the patient when he or she presents at a health care facility and therefore needs to be familiar with the signs, symptoms and risk factors associated with TB. Having suspected TB, the health care worker then needs to ensure that the correct tests are ordered and procedures are followed so that the best quality samples possible are sent to the laboratory and all documentation is filled out clearly and correctly. The successful implementation of these standards can be measured by the accurate and prompt reporting of results, the registration of every case detected and the continued attendance of every patient who needs treatment.

Guidance for the implementation of best practice for the care of patients with tuberculosis

The first two chapters of Best practice for the care of patients with tuberculosis: a guide for low-income countries include an introduction and guidance regarding implementation of best practice. The background to how the guide was developed is significant, as it was developed in collaboration with nurses and other health workers working in the most challenging settings. It therefore provides realistic and practical guidance for best practice where patient loads are large and resources are stretched. Guidance regarding standard setting and clinical audit is an important part of enabling people to recognise the strengths that already exist in their practice and approach those areas that require change in a systematic and practical way. The guide itself consists of a series of standards covering different aspects of patient care, from the moment they seek health care with symptoms to their diagnosis to early stages of treatment, directly observed treatment, the continuation phase and transfer of treatment. There are also standards relating specifically to HIV testing and the care of patients co-infected with tuberculosis and HIV. The standards themselves will appear in full in the subsequent chapters of this series.

A prevalence survey for smear-positive tuberculosis in Thai prisons

SETTINGS

Twenty-seven prisons in Thailand.

OBJECTIVES

To measure the prevalence of smear-positive tuberculosis (TB) and to compare its detection using the World Health Organization (WHO) guidelines for prisons or the International Standards for Tuberculosis Care (ISTC) criteria.

METHOD

Prisoners who were not on TB medications and who had not been treated for TB in the previous 6 months were enrolled in the survey. Prison nurses conducted a one-time mass screening using the WHO questionnaire, with follow-up sputum collection in TB suspects.

RESULTS

Of 71594 prisoners, 22132 (30.9%) were identified as TB suspects, and 254 were confirmed by sputum smear, for a prevalence of 354.8/100000. Males were most likely to be diagnosed with TB disease (OR 2.6), as were those transferring in from another prison versus new prisoners (OR 3.0). The positive predictive value of the WHO criteria was 1.2%, and that of the ISTC standard was 5.9%.

CONCLUSION

TB prevalence in this survey remained high. WHO guidelines, recognised as a standard, require health workers to question prisoners and measure height and weight. The ISTC standard, a single question about cough >or=2 weeks, is simple, may be asked by non-health personnel and may be a better alternative.

Implementation of the DOTS strategy in prisons at provincial level, Thailand

SETTINGS

Sixteen prisons located in four geographic regions in Thailand.

OBJECTIVES

To assess treatment outcomes of tuberculosis (TB) patients under the DOTS strategy in a prison programme.

METHOD

The programme prospectively included 1412 consecutive TB patients registered during Year 1 (June 1999-May 2000), Year 2 (June 2000-May 2001) and Year 3 (June 2001-May 2002). DOTS implementation consisted of government commitment; passive detection by sputum smear microscopy; standardised short-course chemotherapy, including directly observed treatment by prison nurses; maintenance of drug stocks at provincial health offices; and a recording and reporting system. Data were collected using prison TB registers.

RESULTS

The number of TB patients increased from 348 in Year 1 to 490 in Year 2 and to 574 in Year 3. New smear-positive patients accounted for 82.0% of the total. Of the 1158 new smear-positive cases, 68.7% were cured, 17.6% died, 10.6% were transferred out, 2.6% failed, and 0.5% completed treatment.

CONCLUSIONS

DOTS implementation in these prisons could not achieve the national target to cure 85% of new smear-positive cases. More interventions are needed to help reduce the deaths and transferred cases that mainly affected the treatment outcomes in these settings.

Resistance to anti-tuberculosis drugs among smear-positive cases in Thai prisons 2 years after the implementation of the DOTS strategy

SETTING

Three prisons in Bangkok and vicinity, Thailand.

OBJECTIVE

To examine the prevalence of drug-resistant tuberculosis among smear-positive cases in Thai prisons 2 years after the implementation of the DOTS strategy, and to identify factors associated with resistance to anti-tuberculosis drugs.

METHODS

In a cross-sectional study, 154 consecutive tuberculosis patients with at least one positive sputum smear and at least one positive sputum culture registered between 1 May and 31 October 2000 were enrolled. Drug susceptibility testing was performed by the Ministry of Public Health Tuberculosis Division. Patient characteristics were obtained by face-to-face interview.

RESULTS

Resistance to at least one drug was found in 50.6% of the subjects, including multidrug-resistant tuberculosis (MDR-TB) in 19.5%. The proportion of resistance to any anti-tuberculosis drug in prisons A, B and C was respectively 52.7%, 37.8% and 61.5%. The only factor significantly associated with resistance to at least one drug (P = 0.011) and MDR-TB (P < 0.001) was a history of previous tuberculosis treatment.

CONCLUSION

After 2 years of the DOTS strategy, resistance to anti-tuberculosis drugs, an indicator of the quality of tuberculosis treatment, was found to be high. The DOTS strategy currently used in Thai prisons should be reviewed, in order to reduce and prevent drug-resistant tuberculosis.

Economic impact of tuberculosis at the household level

OBJECTIVE

Previous economic analyses of tuberculosis control interventions have focused on the provider perspective. To assess the overall economic impact of the disease and the adequacy of current control strategies from a societal viewpoint, the determination of direct and indirect patient costs is required.

SETTING AND DESIGN

In a cross-sectional survey, all adult tuberculosis patients who completed treatment between August 1996 and February 1997 at 16 randomly selected government health care facilities in Thailand (n = 673) were interviewed using a structured questionnaire. Information were obtained on direct and indirect patient costs before and after diagnosis, and on financing methods and changes in household consumption patterns. All results were stratified for three levels of patient household income: above national average, below national average but above the poverty line, and below the poverty line.

RESULTS

Illness-related costs particularly affected patients with incomes below the poverty line (n = 153). In this group, average out-of-pocket expenditures for the disease amounted to more than 15% of annual household income, while incomes were reduced by 5 % due to illness-related effects. Expenditures were most frequently financed from household savings or transfer payments from community members and relatives. However, 11.8% of patient households took out bank loans, and 15.9% sold part of their property.

CONCLUSION

The current low case detection and treatment completion rates for tuberculosis patients in Thailand may partly be due to the inability of poor patients to cope with the economic consequences of diagnosis and treatment. Suggested improvements include the strict enforcement of an existing government policy of free care, the further decentralization of services to reduce travel costs and work absences, and social security payments for patients undergoing treatment.