Concordance between two methods of bronchoalveolar lavage for the microbiological diagnosis of pneumonia in mechanically ventilated patients

Lázaro Vélez, Natalia Loaiza, Lina María Gaviria, María Angélica Maya, Zulma Vanessa Rueda, Luz Teresita Correa, Jorge Ortega, Héctor Ortega, .

Keywords: pneumonia/etiology, respiration, artificial, diagnostic techniques and procedures, microbiological techniques, bronchoalveolar lavage

Abstract

Introduction. Microbiological diagnosis of pneumonia allows the optimal use of antibiotics in mechanically ventilated patients. That is why samples of bronchoscopic bronchoalveolar lavage had been quantitatively cultivated, but this procedure is not always possible.
Objective. To evaluate the microbiological concordance between respiratory samples obtained by non-bronchoscopic protected bronchoalveolar lavage compared to the bronchoscopic ones, and to find out whether concordance was affected by previous use of antibiotics or the time of pneumonia Honest
Materials and methods. Prospective study conducted at Hospital Universitario San Vicente de Paúl, in 38 patients with suspected pneumonia in mechanical ventilation. Bronchoalveolar lavage specimens were taken by two methods, the traditional one and non-bronchoscopic bronchoalveolar lavage, using a telescoping preformed tip catheter (Balcath®). All samples were processed using conventional microbiologic protocols.
Results. Considering flexible bronchoscopy with bronchoalveolar lavage as the gold standard, cultures allowed the identification of at least one respiratory pathogen in 60.5% of cases. Diagnostic agreement was achieved in 82% of patients and 79% of microbiologic isolates. Using the Cohen´s kappa coefficient, general concordance between both methods was 0.76 [0.60-0.93]; but in those who received previously antibiotics was 0.26 [0.05-0.48], versus 1.0 in those who did not (p<0.0001). Concordance did not differ significantly when cases of early or late pneumonia were compared.
Conclusions. Concordance between non-bronchoscopic and bronchoscopic bronchoalveolar lavage is good in mechanically ventilated patients with pneumonia. However, the use of antibiotics previously, but not the time of pneumonia presentation, significantly decreases that concordance.

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  • Lázaro Vélez Grupo Investigador de Problemas en Enfermedades Infecciosas, Universidad de Antioquia, Medellín, Colombia. Sección de Enfermedades Infecciosas, Departamento de Medicina Interna, Universidad de Antioquia-Hospital Universitario San Vicente de Paúl, Mede
  • Natalia Loaiza Grupo Investigador de Problemas en Enfermedades Infecciosas, Universidad de Antioquia, Medellín, Colombia
  • Lina María Gaviria Grupo Investigador de Problemas en Enfermedades Infecciosas, Universidad de Antioquia, Medellín, Colombia.
  • María Angélica Maya Grupo Investigador de Problemas en Enfermedades Infecciosas, Universidad de Antioquia, Medellín, Colombia.
  • Zulma Vanessa Rueda Grupo Investigador de Problemas en Enfermedades Infecciosas, Universidad de Antioquia, Medellín, Colombia.
  • Luz Teresita Correa Grupo Investigador de Problemas en Enfermedades Infecciosas, Universidad de Antioquia, Medellín, Colombia.
  • Jorge Ortega Sección de Neumología, Departamento de Medicina Interna, Universidad de Antioquia-Hospital Universitario San Vicente de Paúl, Medellín, Colombia.
  • Héctor Ortega Sección de Neumología, Departamento de Medicina Interna, Universidad de Antioquia-Hospital Universitario San Vicente de Paúl, Medellín, Colombia.

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How to Cite
1.
Vélez L, Loaiza N, Gaviria LM, Maya MA, Rueda ZV, Correa LT, et al. Concordance between two methods of bronchoalveolar lavage for the microbiological diagnosis of pneumonia in mechanically ventilated patients. biomedica [Internet]. 2008 Dec. 1 [cited 2024 May 18];28(4):551-6. Available from: https://revistabiomedica.org/index.php/biomedica/article/view/60
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