Evaluation of a commercial test based on ligase chain reaction for direct detection of Mycobacterium tuberculosis in respiratory specimens



Document title: Evaluation of a commercial test based on ligase chain reaction for direct detection of Mycobacterium tuberculosis in respiratory specimens
Journal: Revista da Sociedade Brasileira de Medicina Tropical
Database: PERIÓDICA
System number: 000282532
ISSN: 0037-8682
Authors: 1





Institutions: 1Universidade Federal do Espirito Santo, Centro Biomedico, Vitoria, Espirito Santo. Brasil
Year:
Season: Nov-Dic
Volumen: 37
Number: 6
Pages: 431-435
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental, analítico
English abstract A ligase chain reaction DNA amplification method for direct detection of Mycobacterium tuberculosis (Abbott LCx MTB) in respiratory specimens was evaluated. Results from LCx MTB Assay were compared with those from acid fast bacilli smear, culture, and final clinical diagnosis for each patient. A total of 297 respiratory specimens (sputum and bronchial lavage) from 193 patients were tested. The sensitivity, specificity, positive predictive value and negative predictive value of LCx vs culture were 92.7%, 93%, 67.8% and 98.7%, respectively. When compared to the clinical final diagnosis, the sensitivity, specificity, PPV and NPV for LCx were 88.9%, 96.8%, 86.5% and 97.4%, respectively. The sensitivity of LCx MTB assay was 75% for smear-negative, culture positive samples. The results indicate that LCx MTB assay is a rapid, simple and valuable technique as a complementary tool for the diagnosis of tuberculosis
Portuguese abstract O método de amplificação de DNA baseado na reação em cadeia da ligase (Abbott LCx MTB) foi avaliado para detecção do Mycobacterium tuberculosis em espécimes pulmonares. Os resultados do LCx MTB foram comparados aos resultados de baciloscopia, cultura e diagnóstico clínico para cada paciente. Um total de 297 espécimes (escarro e lavado broncoalveolar) de 189 pacientes foram testadas. Os valores de sensibilidade, especificidade, valor preditivo positivo e valor preditivo negativo do LCX vs cultura foram 92,7%, 93%, 67,8% e 98,7%, respectivamente. Quando comparados ao diagnóstico clínico, os valores de sensibilidade, especificidade, VPP e VPN para o LCx foram 88,9%, 96,8%, 86,5% e 97,4%, respectivamente. A sensibilidade do LCx MTB foi de 75% para as amostras com baciloscopia negativa e cultura positiva. Os resultados indicam que o teste LCx MTB é simples, rápido, eficiente e pode ser utilizado como um recurso complementar para o diagnóstico da tuberculose
Disciplines: Biología
Keyword: Genética,
Parasitología,
Diagnóstico,
Tuberculosis,
Mycobacterium tuberculosis,
Biología molecular,
ADN
Keyword: Biology,
Genetics,
Parasitology,
Tuberculosis,
Molecular biology,
DNA,
Mycobacterium tuberculosis,
Diagnosis
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