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The manual MGIT system for the detection of M. tuberculosis in respiratory specimens: an experience in the University Malaya Medical Centre

Fadzilah MN, Ng KP, Ngeow YF

Malays J Pathol, 2009 Dec;31(2):93-7.
PMID: 20514851

A prospective study was conducted on 510 respiratory specimens for the presence of M. tuberculosis detected by direct acid-fast bacilli (AFB) smear examination, culture in the Manual Mycobacteria Growth Indicator Tube (BBL MGIT, Becton-Dickinson) and culture on Lowenstein-Jensen (LJ) medium. From positive BBL MGIT tubes, Ziehl-Neelsen and Gram stains were performed and subcultures were put up on LJ medium. A total of 101 (19.8%) specimens were positive by the BBL MGIT, 60 (11.8%) by primary LJ medium culture, 31 (6.1%) by direct smear examination and 29 (5.7%) by all three methods. Using primary LJ culture as the gold standard, the sensitivity and specificity of the BBL MGIT were 90% and 89.6% respectively but the sensitivity of AFB smear microscopy was only 48.3%. About half (51.1%) of the BBL MGIT false positives were due to contamination by non-AFB bacteria. The remaining false positives comprised specimens that were AFB microscopy positive but LJ culture negative. Of the AFB isolates obtained on LJ primary and sub-cultures, almost all (93.3%) were identified as Mycobacterium tuberculosis complex. The mean time-to-detection was significantly shorter (p < 0.0001) for the BBL MGIT than for LJ culture. For the former, positive results were available within 14 days for both AFB smear-positive and AFB smear-negative specimens. On the average, positive results were obtained 1.8 days earlier for direct AFB smear-positive samples than for AFB smear-negative samples. On the other hand, positive growth on LJ medium appeared after at least 33 days of incubation. These findings suggest that the BBL MGIT system will be a suitable alternative to LJ culture for the routine diagnosis of pulmonary tuberculosis, but a combination of liquid and solid cultures is still required for the highest diagnostic accuracy.

Matched MeSH terms: Tuberculosis, Pleural/diagnosis*; Tuberculosis, Pleural/microbiology
Fulltext Diagnostic flex-rigid pleuroscopic biopsy of parietal pleura for exudative pleural effusions in suspected malignant and tuberculosis cases: a retrospective study of 219 cases

Lad L, Samsudin AT, Kannan K, Makki JS, Mohamed M

Malays J Pathol, 2015 Aug;37(2):101-7.
PMID: 26277666 MyJurnal

This study was carried out to ascertain the aetiology of exudative pleural effusions when other diagnostic investigations such as pleural fluid and sputum examination for cytology and acid fast bacilli fail to yield a definitive diagnosis and to differentiate between tuberculosis and malignancy in cases suspicious of malignancy.

Matched MeSH terms: Tuberculosis, Pleural/complications; Tuberculosis, Pleural/diagnosis*
Significant resolution of tuberculous pleural effusion on chemotherapy alone

Loh LC, Lim BK, Wan Yusuf S

J R Coll Physicians Edinb, 2010 Jun;40(2):100-4.
PMID: 21125048 DOI: 10.4997/JRCPE.2010.202

As a standard, significant pleural effusion, whether tuberculous (TB) or not, requires therapeutic thoracocentesis. We tested the hypothesis that standard anti-TB chemotherapy alone can resolve significant pleural effusion.

Matched MeSH terms: Tuberculosis, Pleural/drug therapy*
Fulltext Medical thoracoscopy: Pahang experience

Ng TH, How SH, Kuan YC, Hasmah H, Norra H, Fauzi AR

Med J Malaysia, 2008 Oct;63(4):298-301.
PMID: 19385488 MyJurnal

Medical thoracoscopy has gain its popularity in Malaysia recently. This paper presents our early experience in thoracoscopy using semi-rigid fiberoptic thoracoscope. All thoracoscopy records since October 2006 were retrieved. The patients' records, thoracocentesis investigations results, thoracoscopic findings and all pleural biopsy results were reviewed. Twenty-four thoracoscopic procedures on 22 patients in whom two patients had repeated thoracoscopy. Ten patients were confirmed carcinoma. Eight patients had inconclusive thoracoscopic pleural biopsy results. Three patients underwent pleurodesis for malignant effusion. One patient had adhesiolysis for empyema. There was no procedure-related deaths or intraoperative accidents. Thoracoscopy is a relatively safe procedure.

Matched MeSH terms: Tuberculosis, Pleural/diagnosis
Meta-analysis: the association between HIV infection and extrapulmonary tuberculosis

Naing C, Mak JW, Maung M, Wong SF, Kassim AI

Lung, 2013 Feb;191(1):27-34.
PMID: 23180033 DOI: 10.1007/s00408-012-9440-6

BACKGROUND: Extrapulmonary tuberculosis has been an AIDS-defining condition. Individual studies that highlight the association between HIV and extrapulmonary TB are available. Our objectives were to synthesis evidence on the association between extrapulmonary tuberculosis and HIV and to explore the effective preventive measures of these two diseases.
METHODS: This is a meta-analysis of observational studies reporting effect estimates on how HIV is associated with extrapulmonary tuberculosis. We searched for the eligible studies in the electronic databases using search terms related to HIV and extrapulmonary tuberculosis. Where possible, we estimated the summary odds ratios using random effects meta-analysis. We stratified analysis by the type of study design. We assessed heterogeneity of effect estimates within each group of studies was assessed using I (2) test.
RESULTS: Nineteen studies (7 case control studies and 12 cohort studies) were identified for the present study. The pooled analysis shows a significant association between HIV and extrapulmonary tuberculosis (summary odds ratio: 1.3; 95 % confidence interval (CI) 1.05-1.6; I (2): 0 %). In a subgroup analysis with two studies, a significant association was found between CD4+ count less than 100 and the incidence of extrapulmonary tuberculosis (summary OR: 1.31; 95 % CI 1.02-1.68; I (2): 0 %).
CONCLUSIONS: Findings show evidence on the association between extrapulmonary tuberculosis and HIV, based on case control studies. Further studies to understand the mechanisms of interaction of the two pathogens are recommended.

Matched MeSH terms: Tuberculosis, Pleural/epidemiology*
Hiding in plain sight: Diagnosing pleural tuberculosis using lung ultrasound

Ahmed WAW, Rahim MJC, Mohammad N, Fauzi MH, Wahab SFA

Ultrasound, 2021 May;29(2):123-127.
PMID: 33995559 DOI: 10.1177/1742271X20959761

Introduction: Diagnosing pleural tuberculosis can be difficult in patients with ambiguous presentation, especially in resource-limited health centres. Thus, lung ultrasound had been studied as a novel method in helping clinicians to diagnose this condition.
Case presentation: A 48-year-old woman presented with worsening dyspnoea and orthopnoea for one week. She had also experienced weight loss, minimal dry cough and right-sided pleuritic chest pain for several weeks. A chest radiograph showed a right lower zone pleural effusion with no apparent lung consolidation. Lung ultrasound showed a right apical consolidation and right lower zone septated pleural effusion. Pleural fluid investigations showed exudative features of mixed lymphocytic, mesothelial and neutrophilic cellular components. Tuberculin skin test was strongly positive. She was subsequently treated for pleural tuberculosis. One month after treatment, her symptoms had improved considerably.
Discussion: Lung ultrasound has been found to be more effective than chest radiograph in detecting consolidation and diagnosing pneumonia. The portability and efficacy of today's ultrasound machines, including the handheld types, show that lung ultrasound is a practical, reliable and valuable diagnostic tool in managing pulmonary conditions including tuberculosis, provided that the operators are adequately trained.
Conclusion: Lung ultrasound in tuberculosis is the next frontier for clinicians and researchers.

Matched MeSH terms: Tuberculosis, Pleural
Pleural fluid lactate as a point-of-care adjunct diagnostic aid to distinguish tuberculous and complicated parapneumonic pleural effusions during initial thoracentesis: Potential use in a tuberculosis endemic setting

Kho SS, Chan SK, Yong MC, Cheah HM, Lee YG, Tie ST

Respir Investig, 2020 Sep;58(5):367-375.
PMID: 32107195 DOI: 10.1016/j.resinv.2020.01.004

BACKGROUND: Tuberculous pleural effusions (TBEs) and parapneumonic pleural effusion (PPEs) have similar clinical presentations and fluid biochemistry. A pleural biopsy is usually required to diagnose TBE but complete fluid evacuation may not be necessary, contrasting with complicated PPE (CPPE). A point-of-care test that distinguishes between TBE and CPPE enables the appropriate procedures to be performed during the initial diagnostic thoracentesis. Lactate is a metabolic product measurable by a blood-gas analyzer. This study measured pleural fluid (Pf) lactate levels in TBE and compared them with those in PPE/CPPE. We hypothesized that Pf lactate would be significantly higher in PPE because of active metabolic activities than in TBE which is driven by delayed hypersensitivity.
METHODS: All patients undergoing an initial diagnostic thoracentesis over 18 months with Pf lactate measured using a calibrated point-of-care blood gas analyzer were assessed.
RESULTS: The diagnoses of the enrolled patients (n = 170) included TBE (n = 49), PPE (n = 47), malignancy (n = 63), and transudate (n = 11). Pf lactate level in TBE, median 3.70 (inter-quartile range 2.65-4.90) mmol/l, was significantly lower than in PPE and CPPE. In the subgroup of TBE and CPPE patients whose initial Pf pH and glucose could suggest either condition, Pf lactate was significantly higher in those with CPPE. Pf lactate (cutoff ≥7.25 mmol/l) had a sensitivity of 79.3%, specificity 100%, positive predictive value 100%, and negative predictive value 89.1% for discriminating CPPE from TBE (area under the curve 0.947, p

Matched MeSH terms: Tuberculosis, Pleural/diagnosis*
Diagnostic values of different cytokines in identifying tuberculous pleural effusion

Nguyen MH, Dao QM, Bui TTH, Le VHT

Trop Biomed, 2020 Jun 01;37(2):372-378.
PMID: 33612806

Interleukin (IL)-1 beta (IL-1β), IL-2, Interferon-gamma (IFN-γ), tumor necrosis factor-alpha (TNF-α) in the pleural fluid are valuable biomarkers in early diagnosis of Tuberculous Pleural Effusion (TPE). This study aimed to analyze the diagnostic values of some cytokines (IFN-γ, TNF-α, IL-1β, and IL-2) in pleural fluid for identifying TPE in Vietnam. We performed a cross-sectional study on tuberculosis (TB) patients with pleural effusion. Pleural IFN-γ, TNF-α, IL-1β, IL-2 were measured by ELISA® Kit (Abcam, USA) on Biotek system. Receiver operating characteristic curves (ROC), an area under the curve (AUC), sensitivity (Se), specificity (Sp), positive predictive value (PPV), negative predictive value (NPV) and accuracy (ACC) of IFN-γ, TNF-α, IL-1β, IL-2 in identifying TBE were assessed. Among 386 patients, 234 (60,6%) had TPE, and 152 (39,4%) did not have TPE. The median of IL-2, TNF-α, and IFN-γ levels were significantly higher in TPE compared to the non-TPE group (p<0.05). AUC for IL-1β, IL-2, TNF-α, and IFN-γ were 0.54, 0.57, 0.62. 0.84 (p<0.05), respectively. The sensitivity of IL-1β, IL-2, TNF-α, and IFN-γ in the diagnosis of TPE were 82.1, 53.4, 77.8, and 80.3, while the specificity was 28,4, 69.7, 47.4, and 80.9, respectively. IFN-γ and TNF-α are potential biomarkers in diagnosing TPE.

Matched MeSH terms: Tuberculosis, Pleural/diagnosis*
Fulltext Transudative pleural effusion in a patient with pleural tuberculosis

Meryl Grace Lansing, Liew Sat Lin Constance, Chang Chee Keong, Pradip Subramaniam

Malaysian Journal of Medicine and Health Sciences, 2019;15(106):97-97.
MyJurnal

Introduction:Light’s criteria for pleural fluid analysis has long been the standard for distinguishing transudates from exudates. In pleural tuberculosis, the resulting pleural fluids are usually exudates. We present a case of presumed transudative effusion which was eventually diagnosed as pleural tuberculosis. Case description: A 59-year-old man with end-stage renal failure (ESRF) on regular haemodialysis presented with a one-day history of acute onset dys-pnoea associated with pleuritic chest pain and cough. Chest radiograph revealed bilateral pleural effusions and thoracentesis was done. The pleural fluid result was interpreted as transudative effusion according to Light’s criteria because his pleural fluid to serum protein ratio was less than 0.5. AFB 1+ was seen in the pleural fluid with negative gram stain and culture. This resulted in conflicting opinions on whether to start this patient on anti-tuberculous ther-apy (ATT) and there was even a suggestion to get a second opinion for the possibility of AFB fluid contamination. The initial diagnosis was written as fluid overload secondary to ESRF but ATT was started anyway to cover for pleural TB. On further analysis of his pleural fluid, the pleural protein 32 g/L which on its own is a marker of exudative effusion. Subsequent investigations revealed the presence of exudative ascitic fluid which further raised the suspicion for a concomitant peritoneal TB. Conclusion: Premature conclusion that the pleural fluid was transudative occurred prob-ably due to the bilateral nature of the pleural effusion associated with a known tendency for the patient to develop pulmonary overload secondary to his ESRF. This case is a reminder that Light’s criteria also requires serum and fluid LDH measurement for the diagnosis of transudative pleural effusion. More importantly, a high level of suspicion for TB is important when evaluating patients from areas where TB is prevalent and a positive AFB result should not be taken lightly.

Matched MeSH terms: Tuberculosis, Pleural