Timely diagnosis of MDR-TB under program conditions: is rapid drug susceptibility testing sufficient?
- PMID: 16898366
- PMCID: PMC8324020
Timely diagnosis of MDR-TB under program conditions: is rapid drug susceptibility testing sufficient?
Abstract
Timely diagnosis and effective, safe treatment are essential to reduce transmission and improve outcomes for patients with tuberculosis. Aside from laboratory methods, many programmatic factors influence the overall turnaround time (TAT) in diagnosing multidrug-resistant tuberculosis (MDR-TB). We measured each step in the overall TAT required for MDR-TB in two of five health districts of Lima, Peru. The total TAT, from initial sputum specimen to diagnosis and appropriate treatment, was 5 months, almost twice as long as the bacteriological procedures per se. Expensive investments in laboratory technology may yield low returns unless the programmatic aspects of the diagnostic process are streamlined at the same time.
Le diagnostic en temps opportun de la tuberculose et son traitement efficace et sûr sont essentiels pour diminuer la transmission cette maladie et améliorer les résultats du traitement des patients tuberculeux. Outre les méthodes de laboratoire, de nombreux facteurs programmatiques ont une influence sur le temps nécessaire au diagnostic de la tuberculose à germes multirésistants (TB-MR). Nous avons mesuré le temps nécessaire pour diagnostiquer la TB-MR dans deux des cinq districts de Lima, au Pérou. Le temps nécessaire total (de la collecte d’un spécimen de crachat au diagnostic et à la décision de traitement) était de 5 mois, presque deux fois plus long que le temps requis par les procédures de laboratoire elles-mêmes. Investir dans des technologies de laboratoire coûteuses pourrait ne produire que des avantages limités si cette démarche ne s’accompagne pas d’une rationalisation des aspects programmatiques du processus de diagnostic.
El tratamiento seguro, efectivo y el diagnóstico oportuno son esenciales para disminuir la transmisión y mejorar los resultados para los pacientes con tuberculosis. Además de los métodos laboratoriales, muchos factores programáticos influencian sobre los tiempos de demora en el diagnóstico de la tuberculosis multidrogorresistente (TB-MDR). Medimos cada paso en todos los tiempos de demora requeridos para el diagnóstico de la TB-MDR en dos de las cinco Direcciones de salud de Lima, Perú. El tiempo de demora total, desde la solicitud de la muestra inicial de esputo hasta el diagnóstico y tratamiento apropiado, fue de 5 meses, casi dos veces tan prolongado como lo que toma los procedimientos bacteriológicos. Inversiones costosas en tecnología de laboratorio podrían generar una baja recuperación de lo invertido a menos que los aspectos programáticos del proceso diagnóstico estén fuertemente ligados al mismo tiempo.
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