The performance of an in-house nested-PCR technique for pleural tuberculosis diagnoses.

Abstract:

INTRODUCTION:This study evaluated the performance of an in-house nested-PCR system for the detection of the Mycobacterium tuberculosis complex in pleural fluid, blood and urine samples from pleural effusion tuberculosis patients by health services physicians in Pernambuco, Brazil. METHODS:A prospective double-blind study with 37 hospitalized patients of both sexes, aged over 15, was used to investigate the diagnosis of pleural effusion. The criteria used to define the cases included the demonstration of bacillus in biological samples by smear or culture or by a granulomatous finding in the histopathological examination, associated with an evident response to specific treatments to each clinical situation. Pleural fluid, blood and urine samples were collected and subjected to routine tests and the nested PCR technique to assess for M. tuberculosis amplification. RESULTS:In total, 37 pleural effusion patients took part in the study, of whom 19 (51.3%) had tubercular etiologies and 18 (48.7%) had etiologies from other causes. When the pleural fluid, blood and/or urine sample in-house nested-PCR sensitivities were evaluated simultaneously, the results were positive regardless of the biological specimen (the sensitivity was 84.2%); however, when the blood and/or urine samples were analyzed together, the sensitivity was 72.2%. When the pleural fluid samples were evaluated alone, the sensitivity was only 33.3%. CONCLUSIONS:The performance of the diagnostic pleural tuberculosis nested-PCR was directly related to the diversity of the samples collected from the same patient. Additionally, this study may identify a need to prioritize non-invasive blood and urine collection for this diagnosis.

journal_name

Rev Soc Bras Med Trop

authors

Montenegro LM,Silva BC,Lima JF,Cruz HL,Montenegro Rde A,Lundgren FL,Albuquerque Filho AP,Schindler HC

doi

10.1590/0037-8682-0127-2013

subject

Has Abstract

pub_date

2013-09-01 00:00:00

pages

594-9

issue

5

eissn

0037-8682

issn

1678-9849

pii

S0037-86822013005002301

journal_volume

46

pub_type

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