Risk factors for mortality in ventilator-associated tracheobronchitis: a case-control study / Fatores de risco para mortalidade em traqueobronquite associada à ventilação mecânica: estudo caso-controle

ABSTRACT Objective To describe the microbiological characteristics and to assess the risk factors for mortality of ventilator-associated tracheobronchitis in a case-control study of intensive care patients. Methods This case-control study was conducted over a 6-year period in a 40-bed medical-surgical intensive care unit in a tertiary care, private hospital in São Paulo, Brazil. Case patients were identified using the Nosocomial Infection Control Committee database. For the analysis of risk factors, matched control subjects were selected from the same institution at a 1:8.8 ratio, between January 2006 and December 2011. Results A total of 40 episodes of ventilator-associated tracheobronchitis were evaluated in 40 patients in the intensive care unit, and 354 intensive care patients who did not experience tracheobronchitis were included as the Control Group. During the 6-year study period, a total of 42 organisms were identified (polymicrobial infections were 5%) and 88.2% of all the microorganisms identified were Gram-negative. Using a logistic regression model, we found the following independent risk factors for mortality in ventilator-associated tracheobronchitis patients: Acute Physiology and Chronic Health Evaluation I score (odds ratio 1.18 per unit of score; 95%CI: 1.05-1.38; p=0.01), and duration of mechanical ventilation (odds ratio 1.09 per day of mechanical ventilation; 95%CI: 1.03-1.17; p=0.004). Conclusion Our study provided insight into the risk factors for mortality and microbiological characteristics of ventilator-associated tracheobronchitis.

RESUMO Objetivo Descrever as características microbiológicas e avaliar os fatores de risco para mortalidade na traqueobronquite associada à ventilação mecânica em um estudo caso-controle de pacientes de terapia intensiva. Métodos Estudo realizado ao longo de 6 anos em uma unidade de terapia intensiva médico-cirúrgica de 40 leitos, em um hospital privado e de nível terciário em São Paulo, Brasil. O Grupo Caso foi identificado usando o banco de dados da Comissão de Controle de Infecção Hospitalar. O Grupo Controle foi pareado na proporção de 1:8,8 entre janeiro de 2006 e dezembro de 2011. Resultados Quarenta episódios de traqueobronquites associadas à ventilação foram avaliados em 40 pacientes na unidade de terapia intensiva, e 354 pacientes não apresentaram traqueobronquite Grupo Controle. Foram identificados 42 microrganismos (dos quais 5% foram infecções polimicrobianas), sendo que 88,2% de todos os microrganismos eram bactérias Gram-negativas. Usando um modelo de regressão logística, encontramos os seguintes fatores de risco independentes para mortalidade em pacientes com traqueobronquites associadas à ventilação: pontuação da Acute Physiology and Chronic Health Evaluation I (odds ratio 1,18 por uma unidade de pontuação; IC95%: 1,05-1,38; p=0,01) e duração da ventilação mecânica (odds ratio 1,09 por dia de ventilação mecânica; IC95%: 1,03-1,17; p=0,004). Conclusão Nosso estudo forneceu informações sobre os fatores de risco para mortalidade e características microbiológicas da traqueobronquite associada à ventilação mecânica.

Association between pathogens from tracheal aspirate and oral biofilm of patients on mechanical ventilation

Abstract The aim of this study was to detect possible associations between respiratory pathogens from tracheal aspirate and oral biofilm samples in intubated patients in an intensive care unit (ICU), and to identify the most common respiratory pathogens in oral biofilm, particularly in patients that developed ventilator-associated pneumonia (VAP). Two oral biofilm samples were collected from the tongue of intubated patients (at admission and after 48 hours) and analyzed by culture with the Antibiotic Sensitivity Test. The results from the tongue biofilm samples were compared with the tracheal secretions samples. A total of 59.37% of patients exhibited the same species of pathogens in their tracheal aspirate and oral biofilm, of which 8 (42.1%) developed VAP, 10 (52.63%) did not develop pneumonia and one (5.26%) had aspiration pneumonia. There was a statistically significant association between presence of microorganisms in the tracheal and mouth samples for the following pathogens: Klebsiella pneumoniae, Candida albicans, Pseudomonas aeruginosa, Enterobacter gergoviae, Streptococcus spp and Serratia marcescens (p < 0.05). Pathogens that are present in tracheal aspirates of intubated patients can be detected in their oral cavity, especially in those who developed VAP or aspiration pneumonia. Thus, the results indicate that an improved oral care in these patients could decrease ICU pneumonia rates.

Effects of hydrogen peroxide mouthwash on preventing ventilator-associated pneumonia in patients admitted to the intensive care unit

Abstract Aims The aim of the study was to determine the effect of hydrogen peroxide (HP) mouthwash on the incidence of ventilator associated pneumonia (VAP) in patients admitted to the intensive care unit (ICU). Methods This was a randomized clinical trial conducted on 68 patients. The intervention group used 3% HP as mouthwash and the control group used mouthwashes with 0.9% normal saline (NS) twice a day. Data were collected using a questionnaire and the Modified Clinical Pulmonary Infection Score (MCPIS). MCPIS includes five items, body temperature: white blood cell count, pulmonary secretions, the ratio of pressure of arterial oxygen (PaO2) to fraction of inspired oxygen (FiO2), and the chest X-ray. Each of these items scored 0–2. Scores ≥6 were considered as VAP signs. The SPSS-20 software was employed to analyze the data. Results In total, 14.7% patients of the HP group and 38.2% patients of the NS group contracted VAP. The risk of VAP in the NS group was 2.60 times greater than that in the HP group (RR = 2.60, 95% CI: 1.04–6.49, p = 0.0279). The mean ± SD MCPIS was calculated as 3.91 ± 1.35 in the HP group and 4.65 ± 1.55 in the NS group, a difference statistically significant (p = 0.042). There were no significant differences in the risk factors for VAP between the two groups. Conclusion HP mouthwash was found more effective than NS in reducing VAP. HP mouthwash can therefore be used in routine nursing care for reducing VAP.

Clinico-microbiological study of infections in the intensive care unit and study of antimicrobial resistance in bacterial isolates.

Infectious disease specialists have long recognized that the risk of ICU patients acquiring nosocomial infections is 5-10 times greater than those in general wards. Several factors such as severe underlying disease, multiple illnesses, malnutrition, extremes of age, immunosuppression, use of invasive medical devices, ICU crowding and animate reservoirs increase the risk of acquiring infections in the ICU. Out of 113 isolates obtained in our study, 32.7% were from ventilator-associated pneumonia patients and 17.7% from urinary tract infection patients. The major isolates were Staphylococcus aureus (21.2%) and Klebsiella spp. (20.4%). Methicillin resistant Staphylococcus aureus (MRSA) and ESBL producing Klebsiella and E. coli were the major drug resistant bacteria isolated and associated with significant mortality. Control of these infections poses a major problem in treating the patients because of the rising trend of drug resistance among these bacteria.

Endotracheal Colonization and Ventilator-associated Pneumonia in Mechanically Ventilated Patients according to Type of Endotracheal Suction System

PURPOSE: This study was conducted to identify endotracheal colonization and the incidence of ventilator-associated pneumonia related to the type of endotracheal suction system. METHODS: The participants in this study were ICU patients hospitalized between October 2009 to March 2010 who used ventilators for over 48 hr with closed (CSS, n=30) or open (OSS, n=32) suction systems. To standardize the pre-intervention suction system, a suctioning protocol was taught to the ICU nurses. Collected data were analyzed using chi2-test, Fisher's exact test, Wilcoxon rank sums test, Wilcoxon test, Log-rank test and Poisson regression. RESULTS: Endotracheal colonization was higher in OSS than CSS from day 1 to day 8 while using a ventilator and there was a significant difference between the two groups. The CSS reached 50% of endotracheal colonization by the 4th day, whereas for the OSS, it was the 2nd day (p=.04). The incidence of ventilator-associated pneumonia showed no significant difference. CONCLUSION: For patients with a high risk of pneumonia, CSS must be used to lower endotracheal colonization.

Recommendations for hygiene of masks and circuits in mechanically home ventilated patients

Home mechanical ventilation requires equipment, consisting of a generator of pressure, a tubing and an interface to deliver air to the patient. Instructions for equipment maintenance are generally not based on scientific evidence. Studies however have reported that tubing and masks used at home are the most commonly found as very dirty and contaminated. Dirtiness and contamination of equipment potentially expose patients to a higher risk of airway colonization, which, in turn, should cause respiratory infections. For this reason, published hygiene instructions include the use of disinfectant solution. Nevertheless, they generally fail to explain how basic maintenance may be achieved by simple cleaning with soap and water. The instructions for post-cleaning disinfection will depend upon the relative sensitivity of patients to respiratory tract infections and the related risks for bacterial colonization of the airways. Restrictive and obstructive disease patients are not equally sensitive to infections and, as a consequence, should not require similarly elaborate disinfection level. According with the restrictive or obstructive origin of respiratory insufficiency, the current educational review suggests simple and adequate rules for hygiene of tubing and masks in the home setting. Written instructions on how to clean the equipment for home ventilation are useful and sufficient in restrictive patients. In obstructive patients, cleaning always precedes disinfection. After cleaning, rinsing and drying are important. An effective weekly 20-minute disinfection may be achieved by using an hypochlorite solution of soaking in a concentration of 0.5 percent.

Device-associated infections in a Colombian neonatal intensive care unit

Objective: The present study was aimed at determining device-associated infection rates, device use rates and the microbiologic profile of nosocomial infections in a tertiary neonatal intensive care unit (ICU) in Bogotá, Colombia. Methods: Prospective nosocomial infection surveillance was implemented in a neonatal intensive care unit for 11 months in line with the High Risk Nursery component of the Colombian Nosocomial Infection Surveillance programme. Patient-days, length of stay, device use rates and device-associated nosocomial infection rates were calculated. Results: 1 998 device days were observed among 2 890 patient days during the 11 months' surveillance. Central venous catheter-related bloodstream infection was the most common device-associated infection for all birth-weight categories. 69,2 percent and 100 percent of all coagulase negative staphylococci and Staphylococcus aureus infections were methicillin resistant strains and all gram negative rods were susceptible to third generation cephalosporins, carbapenems, ciprofloxacin and piperacillin-tazobactam. Device-associated infection and device use rates in the ICU were higher than Colombian Nosocomial Infection Surveillance reports for October 2004 and reports from Colombia and other Latin-American countries. Conclusions: This surveillance identified blood-stream infection as being the most common infection in the ICU in question. Efforts should thus be directed at establishing suitable infection-control practices.

Objetivo: El objetivo del presente estudio fue determinar las tasas de infección asociadas a dispositivos médicos, las tasas de utilización y el perfil microbiológico de las infecciones hospitalarias en una unidad de terapia intensiva neonatal en Bogotá-Colombia. Métodos: Un sistema de vigilancia de infección hospitalaria fue implementado en la unidad de terapia intensiva neonatal de un hospital de tercer nivel durante un periodo de 11 meses de acuerdo al componente neonatal del sistema de vigilancia de infección hospitalaria de los estados unidos. Se calcularon los días pacientes, los días de estancia, las tasas de utilización y de infección asociadas a dispositivos invasivos. Resultados: Un total de 1 998 días dispositivos fueron observados entre 2 890 días paciente durante los 11 meses de vigilancia. La infección asociada a catéter central fue la infección más frecuente entre las diferentes categorías de peso neonatal. El 69,2 por ciento y el 100 por ciento de todos los Staphylococos coagulasa negativa y Staphylococcus aureus fueron resistentes a meticilina respectivamente, y todos los bacilos gram negativos fueron susceptibles a las Cefalosporinas de tercera generación, Carbapenemicos, Ciprofloxacina y a Piperacilina-Tazobactam. Las tasas de infección asociada a dispositivos invasivos y las tasas de utilización en nuestra unidad fueron superiores al reporte de octubre del 2004 del sistema de vigilancia de infección hospitalaria de los estados unidos y de otros trabajos realizados en Colombia y en Latinoamérica. Conclusiones: Este proceso de vigilancia ha permitido identificar que las infecciones del torrente sanguíneo comprende el principal problema de nuestra unidad y por tal motivo la necesidad de implementar adecuadas medidas de control de infecciones para disminuir la ocurrencia de esta infección debe ser la prioridad de nuestra institución.

Development of quality indicators of nosocomial infection control.

OBJECTIVES: To study the rates of catheter associated urinary tract infection (CAUTI), Ventilator-associated pneumonia (VAP), Central venous catheter blood stream infection (CVCBSI) and surgical site infection (SSI) in Thai hospitals. The rates of the infections will be used as quality indicators. MATERIAL AND METHOD: Active surveillance in 38 hospitals in Thailand during 2003-2004. Risk stratification of NI rates and utilization of devices were calculated. Results: The rates of CAUTI, VAP, CVCBSI and SSI were obtained. Pooled means, and rates of NI at 10, 25, 50, 75 and 90 percentiles were calculated for CAUTI, VAP, CVCBSI. The infection rates were also presented for each type of hospital. The above NI rates were comparable to those reported by the National Nosocomial Infection Surveillance System (NNIS) in the United States. Surgical site infection was studied in 21 procedures with risk index categories 0-2. The rates of SSI in the present study was lower than those in the U.S. study due to different methods of study. CONCLUSION: The risk stratified rates of CAUTI, VAP, CVCBSI and SSI were obtained. They were similar to a larger scale of study in the United States. The NI rates could be used for evaluating the efficacy of NI control in Thai hospitals.

Infección relacionada a asistencia respiratoria mecánica / Related infection to mechanical respiratory assistance

Lavado de manos. - Uso preferencial TET vs. nasotraqueal. - Uso VNI. - Cambio no rutinario de circuitos. - Uso no recomendado de antiácidos. - Uso racional de ATB.