Traqueobronquite associada à ventilação mecânica: uma atualização / Ventilator-associated tracheobronchitis: an update

RESUMO As infecções do trato respiratório inferior associadas à ventilação mecânica são uma das complicações mais frequentes em pacientes em ventilação mecânica. Há muitos anos, a traqueobronquite associada à ventilação mecânica tem sido considerada uma doença que não demanda antibioticoterapia. Na última década, diversos estudos demonstraram que a traqueobronquite associada à ventilação mecânica deve ser considerada um processo intermediário que leva à pneumonia associada à ventilação mecânica, uma vez que apesar de ter impacto limitado sobre a mortalidade dos pacientes gravemente enfermos internados nas unidades de terapia intensiva, em contrapartida, demonstra associação significativa com o aumento dos custos hospitalares desses pacientes, assim como do tempo de internação na unidade de terapia intensiva e hospitalar, do uso de antibióticos, e da duração da ventilação mecânica. Embora ainda necessitemos de evidências científicas mais robustas, especialmente no que tange às modalidades terapêuticas, os dados atuais a respeito da traqueobronquite associada à ventilação mecânica salientam que há desfechos suficientemente importantes que exigem vigilância epidemiológica e controle clínico adequados.

ABSTRACT Ventilator-associated lower respiratory tract infection is one of the most frequent complications in mechanically ventilated patients. Ventilator-associated tracheobronchitis has been considered a disease that does not warrant antibiotic treatment by the medical community for many years. In the last decade, several studies have shown that tracheobronchitis could be considered an intermediate process that leads to ventilator-associated pneumonia. Furthermore, ventilator-associated tracheobronchitis has a limited impact on overall mortality but shows a significant association with increased patient costs, length of stay, antibiotic use, and duration of mechanical ventilation. Although we still need clear evidence, especially concerning treatment modalities, the present study on ventilator-associated tracheobronchitis highlights that there are important impacts of including this condition in clinical management and epidemiological and infection surveillance.

Terapêutica antibiótica na traqueobronquite associada à ventilação mecânica: uma revisão da literatura / Antibiotic therapy in ventilator-associated tracheobronchitis: a literature review

RESUMO O conceito de traqueobronquite associada à ventilação mecânica é controverso, e sua definição não é unanimemente aceita, sobrepondo-se, muitas vezes, à da pneumonia associada à ventilação mecânica. A traqueobronquite associada à ventilação mecânica tem incidência semelhante à da pneumonia associada à ventilação mecânica, com elevada prevalência de agentes multirresistentes isolados, condicionando um aumento do tempo de ventilação mecânica e de internação, ainda que sem impacto na mortalidade. A realização de culturas quantitativas pode permitir melhor definição diagnóstica da traqueobronquite associada à ventilação mecânica, possivelmente evitando o sobrediagnóstico desta entidade. Uma das maiores dificuldades na diferenciação entre traqueobronquite associada à ventilação mecânica e pneumonia associada à ventilação mecânica reside na exclusão de um infiltrado pulmonar por meio da radiografia do tórax; também podem ser necessárias a tomografia computadorizada torácica, a ultrassonografia torácica ou ainda a colheita de amostras invasivas. A instituição de terapêutica antibiótica sistêmica não demonstrou melhorar o impacto clínico da traqueobronquite associada à ventilação mecânica, nomeadamente na redução do tempo de ventilação mecânica, de internação ou mortalidade, apesar da eventual menor progressão para pneumonia associada à ventilação mecânica, ainda que existam dúvidas relativas à metodologia utilizada. Deste modo, considerando a elevada prevalência da traqueobronquite associada à ventilação mecânica, o tratamento desta entidade, por rotina, resultaria em elevada prescrição antibiótica sem benefícios claros. No entanto, sugerimos a instituição de terapêutica antibiótica em doentes com traqueobronquite associada à ventilação mecânica e choque séptico e/ou agravamento da oxigenação, devendo ser realizados simultaneamente outros exames auxiliares de diagnóstico para exclusão da pneumonia associada à ventilação mecânica. Após esta revisão da literatura, entendemos que uma melhor diferenciação entre traqueobronquite associada à ventilação mecânica e pneumonia associada à ventilação mecânica pode diminuir, de forma significativa, a utilização de antibióticos em doentes críticos ventilados.

ABSTRACT The concept of ventilator-associated tracheobronchitis is controversial; its definition is not unanimously accepted and often overlaps with ventilator-associated pneumonia. Ventilator-associated tracheobronchitis has an incidence similar to that of ventilator-associated pneumonia, with a high prevalence of isolated multiresistant agents, resulting in an increase in the time of mechanical ventilation and hospitalization but without an impact on mortality. The performance of quantitative cultures may allow better diagnostic definition of tracheobronchitis associated with mechanical ventilation, possibly avoiding the overdiagnosis of this condition. One of the major difficulties in differentiating between ventilator-associated tracheobronchitis and ventilator-associated pneumonia is the exclusion of a pulmonary infiltrate by chest radiography; thoracic computed tomography, thoracic ultrasonography, or invasive specimen collection may also be required. The institution of systemic antibiotic therapy does not improve the clinical impact of ventilator-associated tracheobronchitis, particularly in reducing time of mechanical ventilation, hospitalization or mortality, despite the possible reduced progression to ventilator-associated pneumonia. However, there are doubts regarding the methodology used. Thus, considering the high prevalence of tracheobronchitis associated with mechanical ventilation, routine treatment of this condition would result in high antibiotic usage without clear benefits. However, we suggest the institution of antibiotic therapy in patients with tracheobronchitis associated with mechanical ventilation and septic shock and/or worsening of oxygenation, and other auxiliary diagnostic tests should be simultaneously performed to exclude ventilator-associated pneumonia. This review provides a better understanding of the differentiation between tracheobronchitis associated with mechanical ventilation and pneumonia associated with mechanical ventilation, which can significantly decrease the use of antibiotics in critically ventilated patients.

Nosocomial tracheobronchitis in mechanically ventilated patients: frequency, aetiology and outcomes

The aim of this study was to determine the frequency, etiology, microbiological sensitivity and outcomes of nosocomial tracheobronchitis [NTB] in mechanically ventilated patients admitted in surgical intensive care unit. A prospective observational study was conducted in the Surgical Intensive Care Unit [ICU], Department of Anaesthesiology, Civil Hospital Karachi from April 2009 to April 2010. All the patients on mechanical ventilator for more than 48 hours in the ICU were evaluated according to the criteria for the diagnosis of nosocomial tracheobronchitis [NTB]. Outcomes of the patients were measured in terms of development of nosocomial pneumonia after NTB, length of ICU stay, duration of mechanical ventilation and mortality in the ICU. Two hundred and eighteen patients were evaluated for this study. Nosocomial tracheobronchitis was diagnosed in 72 patients. The frequency of NTB was 33%. Sixteen types of organisms were identified, 61.23% cases were poly-microbial, while in the remaining 39.7% cases single organism was isolated. The most common organism was gram negative Acinetobacter spp [51%], followed by Klebsiella spp [29%] and Pseudomonas aeruginosa [16.6%]. Escherichia coli and other gram negative rods were 13.8 % and 11.4%, respectively. There were 4.16 % cases of MRSA isolated in patients who had positive cultures for gram negative organ-isms [poly-microbial]. Ceftriaxone was given in 44% cases as empirical therapy and continued in 33% cases after microbial sensitivity and replaced in 11% cases after culture sensitivity to Cefiperazone + salbactum and in 14% cases cefiperazone was given in combination therapy. Imipenem was used in 28.5% of patients. Quinolones were used in 19% contaminated cases of gut surgeries. Nosocomial tracheobronchitis was significantly associated with increased length of ICU stay and longer duration of mechanical ventilation in our patients when compared to those patients who did not develop NTB [p<0.001]. Moreover, out of 72 patients, 11 developed subsequent nosocomial pneumonia. There was no statistically significant difference noted in mortality rates among patients with NTB and without NTB [43% vs. 41%]. The mortality was related to concomitant comorbitidies, primary cause and surgical outcomes. Nosocomial tracheobronchitis is a common infection in mechanically ventilated patients that significantly affects the development of pneumonia and length of ICU stay for the patients. This study was an insight to the state of NTB in an ICU setup. The higher frequency of NTB demands such studies to set protocols in every intensive care unit

An unusual case of invasive aspergillus ulcerative tracheobronchitis without involvement of lung parenchyma in a post-renal transplant patient.

We present the case of a 54-year-old male, who presented with respiratory complaints four months after he underwent renal transplantation. Bronchoscopy showed ulcerated mucosa of the left main bronchus and computed tomography (CT) of the thorax showed foci of air within the bronchial wall. A biopsy from the lesion showed septate fungal hyphae, dichotomously branching at acute angles. A locally invasive Aspergillus ulcerative tracheobronchitis with no parenchymal involvement is an important cause of tracheobronchitis in post-renal transplant patients. An early diagnosis and institution of appropriate treatment can improve the outcome. A combination treatment of caspofungin and voriconazole can be considered if patient is not responding to voriconazole alone.

Infecciones respiratorias asociadas a traqueostomías en niños / Respiratory infections due to tracheostomy in children

Tracheostomy is the communication between the trachea and the exterior. This procedure is indicated in situations of critical upper airway obstruction or need of long term mechanical ventilation. This condition of airway exposed directly to the environment, without the natural mechanisms of defence, determines a higher risk for infections. This paper seeks defining microbiological situations in patients with tracheostomy and suggests treatment guidelines.

La traqueostomía es un procedimiento que comunica la tráquea con el exterior, indicada en situaciones de obstrucción crítica de la vía aérea alta o necesidad de ventilación mecánica prolongada. Esta situación de comunicación de la vía aérea con el medio, sin los mecanismos de protección naturales, determina un mayor riesgo de infecciones respiratorias. Este artículo busca definir situaciones microbiológicas frecuentes en pacientes con traqueostomía y sugerir líneas de manejo.

Studies on recent outbreaks of infectious laryngotracheitis

Recently, increased incidence of outbreaks of infectious laryngotracheitis [ILT] was observed among chicken flocks in Egypt. These were associated with variable high mortalities. Investigation of 8 such outbreaks revealed that three nonvaccinated replacement layer pullets of 6-8 weeks of age were severely affected with mortality rates of 11-12% up to 40%, while in a 4[th] pullet flock of 24 weeks of age, which was comparatively milder and resulted in only 2% mortality. On the other hand, in four commercial broiler flocks of 5-7 weeks of age with no history of previous vaccination, the disease varied in severity and mortalities [7.6 - 18.0%]. Eight isolates were recovered from these outbreaks and were identified as those of ILTV. Pathogenicity tests for two representative isolates from pullets and broilers were carried out by inoculation of each intratracheally into susceptible chickens of the respective types [egg and meat-type], morbidity and mortality rates were used to calculate an intratracheal pathogenicity index used the same as that described for Newcastle disease virus, in addition to microscopic tracheal lesion scoring as criteria for judging their pathogenicity. Results indicated that both isolates were pathogenic like wild ILT field viruses. Reversed virulence of modified live vaccine viruses was speculated under prevailing conditions of suboptimal management practices, hygiene and biosecurity measures which help spread of infection between flocks, beside the role of latently infected carrier birds and other factors in the epizootiology of the disease, especially in nonvaccinated flocks, were discussed

Traqueitis bacteriana: 22 casos atendidos en el Hospital para el Niño, DIFEM, de 1985 a 1994 / Bacterial tracheitis: 22 cases from Hospital para el Niño DIFEM, from 1985 to 1994

La traqueitis bacteriana (TB) es una enfermedad aguda bacteriana caracterizada por la obstrucción respiratoria alta con fiebre y es diagnosticada por la presencia de secreciones purulentas en la tráquea. Reportamos 22 casos de TB admitidos entre 1985 y 1994 en el Hospital para el Niño de Toluca que fueron diagnosticados por broncoscopia y cultivos bacterianos. Se presentó en los meses de frío (90 por ciento) y 16 casos tuvieron entre uno y tres años de edad. Se encontraron las siguientes bacterias: S. aureus, S. pyogenes, H. influenzae, Enterobacter, E. coli y P. aureus, S. pyogenes, H. influenzae, Enterobacter, E. coli y P. aeruginosa. Es conveniente que el médico mantenga un alto índice de sospecha de TB en aquellos niños con fiebre y obstrucción respiratoria alta que no responde al tratamiento habitual para crup

Traqueítis bacteriana

La traqueítis bacteriana es una entidad potencialmente fatal que ha reaparecido en la última década con inusitado auge. A propósito de su detección en nuestro servicio decidimos realizar un estudio retrospectivo en el Hospital Universitario de la Misericordia de Santa Fe de Bogotá entre enero de 1990 y julio de 1994. Se revisaron 88 historias de pacientes con diagnósticos clínico sugestivo de traqueítis bacteriana pero sólo 13 pacientes cumplieron con el requisito de confirmación endoscópica del diagnóstico para ser considerados en el presente trabajo. La edad osciló entre 1 y 7 años, predominando el sexo masculino. Existió antecedente de infección respiratoria previa en el 54 por ciento, los síntomas más frecuentes fueron fiebre, tos perruna y dificultad respiratoria; los hemogramas mostraron leucocitosis, neutrofilia y aumento de la VSG. En la endoscopia se observó exudado traqueal, membranas purunlentas y úlceras; en solo cultivo se aisló Staphylococcus aureus. El 62 por ciento requirió permeabilizar la vía aérea, 3 con traqueostomía y 5 con tubo orotraqueal. El 46 por ciento se manejó con oxacilina y todos evolucionaron satisfactoriamente.

Paracoccidioidomicose pulmonar agressiva, endotraqueíte estenosante e cor-pulmonale subagudo: descriçäo de um caso / Aggressive pulmonary paracoccidioidomycosis, stenosing endotracheitis and cor pulmonale: report of a case

A paracoccidioidomicose (Pbmicose) atinge os pulmöes pela via inalatória, onde se estabelece o complexo primário semelhante ao da tuberculose. A traquéia comprometida pela via tubohemolinfática desenvolveria reaçäo inflamatória em processo granulomatoso levando à obstruçäo estenosante com asfixia. Acompanhou-se um doente, masculino, 32 anos, branco, natural de Sarutaiá (SP), lavrador, que há 8 meses desenvolveu tosse expectorativa branco-amarelada, diária, sem fatores de melhora ou piora e dispnéia inicial discreta. Há 4 meses, anorexia, fraqueza e astenia. Há 1 mês a dispneia se agravou. Perdeu 15 kg. Tabagista e etilista há 16 anos. Exame físico revelou: PA - 10/7 mmHg, FR = 28 bpm, peso 31 kg, hipocratismo digital e hipotrofia muscular Tórax enfisematoso e síndrome obstrutivo aos testes de funçäo pulmonar. Coraçäo: P2 desdobrada e hiperfonética. Hepatesplenomegalia. Desenvolveu cor-pulmonale e insuficiência adrenal à internaçäo, evoluindo após 45 dias para óbito em insuficiência respiratória aguda asfixiante, apesar da terapia antifúngica ter sido completa. A literatura médica revista näo mostrou registro de caso semelhante de cor-pulmonale e insuficiência adrenal de evoluçäo subaguda