Ventilator-associated pneumonia in trauma patients with open tracheotomy: Predictive factors and prognosis impact Anis Chaari, Hichem Kssibi, Wassim Zribi1, Fatma Medhioub, Hedi Chelly, Najla B. Algia, Chokri B. Hamida, Mabrouk Bahloul, MounirBouaziz Departments of Intensive Care, 1Orthopedic Surgery, Habib Bourguiba University Hospital, Sfax, Tunisia
ABSTRACT Objective: To assess the predictive factors of ventilator associated pneumonia (VAP) occurrence following open tracheotomy in trauma patients. Materials and Methods: We conducted an observational, prospective study over 15 months, between 01/08/2010 and 30/11/2011. All trauma patients (except those with cervical spine trauma), older than 15 years, undergoing open tracheotomy during their ICU stay were included. All episode of VAP following tracheotomy were recorded. Predictive factor of VAP onset were studied. Results: We included 106 patients. Mean age was 37.9 ± 15.5 years. Mean Glasgow coma Scale (GCS) was 8.5 ± 3.7 and mean Injury Severity Score (ISS) was 53.1 ± 23.8. Tracheotomy was performed for 53 patients (50%) because of prolonged ventilation whereas 83 patients (78.3%) had tracheotomy because of projected long mechanical ventilation. Tracheotomy was performed within 8.6 ± 5.3 days. Immediate complications were bleeding events (22.6%) and barotrauma (0.9%). Late complications were stomal infection (28.3%) and VAP (52.8%). In multivariate analysis, independent factors predicting VAP onset were delayed tracheotomy (OR = 0.041; CI95% [1.02-7.87]; P = 0.041) and stomal infection (OR = 3.04; CI95% [1.02-9.93]; P = 0.045).Thirty three patients died in ICU (31.1%) without significant impact of VAP on mortality. Conclusion: Late tracheotomy and stomal infection are independent factors predicting VAP onset after open tracheotomy in trauma patients. The occurrence of VAP prolongers mechanical ventilation duration and intensive care unit (ICU) length of stay (LOS) but doesn’t increase mortality. Key Words: Multiple trauma, prognosis, tracheotomy, ventilator associated pneumonia
INTRODUCTION Tracheotomy is one of the oldest and the most conducted procedures in critically ill patients.[1,2] This technique facilitates airway management and offers numerous advantages such as shortening the duration of mechanical ventilation, easier weaning from mechanical ventilation, avoiding translaryngeal complications… [3-6] Trauma patients represent a specific Address for correspondence: Dr. Anis Chaari, E-mail: [email protected]
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population who can potentially benefits of these advantages. In fact, during, the first hours of trauma, mechanical ventilation is always required for severe cases because of consciousness impairment, acute respiratory failure (chest trauma, aspiration…) or uncontrolled shock. Secondly, even though satisfactory weaning parameters are reached, extubation may be delayed because of the inability of these patients to protect their airway or persistent impaired level of consciousness. For all these reasons, tracheotomy was proposed as an alternative modality for airway management in trauma patients and gave encouraging results concerning reduction of mechanical ventilation duration and ICU length of stay.[9,10] Several studies have even suggested a decreased incidence of ventilator-associated pneumonia (VAP) with this procedure.[9,11] However, available data in the literature dealing with this infectious complication are conflicting because of heterogeneity of studied population: Different level of trauma severity, different modalities of tracheotomy procedure (open tracheotomy versus percutaneous tracheotomy) and different delay (early versus late tracheotomy). Journal of Emergencies, Trauma, and Shock I 6:4 I Oct - Dec 2013
Chaari, et al.: Ventilator-associated pneumonia in trauma patients with open tracheotomy
The aim of the present study is to identify independent factors correlated with VAP onset in severe trauma patients undergoing open tracheotomy during their ICU stay. MATERIALS AND METHODS Study design
This prospective observational study was conducted over 15 months, between 01/08/2010 and 30/11/2011 in our medical surgical intensive care unit (HabibBourguiba University Hospital – Sfax – Tunisia). Our study was approved by our local ethic board. Patients
All trauma patients older than 15 years and undergoing open tracheotomy during their ICU stay were eligible for our study. We excluded patients meeting at least one of the following criteria: • Patients who developed VAP prior to tracheotomy. • Tracheotomy performed for urgent airway management. • Patients with cervical spine trauma. • Patients who undergone percutaneous tracheotomy. During the study period, 386 adult trauma patients were admitted in our ICU. All of them were ventilated either on the scene of the accident or at their arrival to our emergency department. During their ICU stay, 106 (27.5%) needed tracheotomy and were included in our study. For each included patient, the following data were recorded on admission: • Demographic parameters: Age, sex, previous medical history. • Clinical parameters: Blood pressure, heart rate, respiratory rate, neurological state (the consciousness was judged by the Glasgow Coma Scale (GCS) calculated on the scene of the accident before sedation infusion, localization signs, motor deficiency…). • Exhaustive chart of trauma lesions were obtained by imaging test. All our patients had undergone cranial, thoracic, abdominal and pelvic computed tomography. The trauma severity was assessed by the Injury Severity Score (ISS). • The clinical severity was assessed by the Simplified Acute Physiology Score (SAPS II) and the Sequential Organ Failure Assessment (SOFA) score. • Therapeutic measures (mechanical ventilation, sedation, surgery, osmotherapy). Ventilation and weaning modalities
Patients were kept under sedation and mechanical ventilation for at least 48 hours. Sedation withdrawal was decided if intracranial hypertension was controlled and if the patients had a good level of consciousness, a positive end expiratory pressure (PEEP) of 5 cm H2O and 50% of oxygen. Then, A T-piece test is tried and extubation is performed within 1 hour if the test is successful. However, the trial was stopped if the patient developed a respiratory rate >30 per minute, SpO2 48 hours) pulmonary infiltrates with at least two of the following criteria: Fever >38°C or hypothermia 12000/mm 3 or 7 days
Delay of weaning from MV after tracheotomy
Successful Oral feeding after tracheotomy
MV: Mechanical ventilation
intubation in terms of VAP incidence.[20,28] However, Lesnik et al. reported in a retrospective study including 101 patients with blunt and multiple organ trauma, that early tracheostomy significantly reduces the incidence of VAP when compared to prolonged endotracheal intubation. The same conclusions were highlighted by Kluger et al.  who retrospectively studied 118 cases of trauma patients requiring tracheostomy during their ICU stay: Early tracheostomy was associated with a significant reduction of VAP incidence. Similarly, Rodriuez et al. found in their prospective randomized trial, a significantly decreased frequency of VAP in patients who underwent early tracheostomy (within 5 days of intubation). 249
Chaari, et al.: Ventilator-associated pneumonia in trauma patients with open tracheotomy
In our study, multivariate analysis shows also that delayed tracheotomy (> 7 days regarding the initiation of mechanical ventilation) was an independent factor predicting VAP onset (OR = 0.041; CI95% [1.02-7.87]; P = 0.041). Several hypotheses can be advanced to explain reduced VAP incidence with early tracheotomy: First, tracheotomy can reduce mechanical ventilation duration which represents the main risk factor for VAP onset.[9,10,20,30] Second, this procedure facilitates nursing care which may avoid secretions pooling above the endotracheal cuff and aspiration through the vocal cords, kept open by the tube. Third, tracheotomy is associated with less endotracheal damage such as ulcerations and edema which may causes repetitive aspiration episodes and finally, tracheotomized patients have the opportunity to have an oral nutrition sooner than intubated patients which reduce the need of orogastric tubes used for enteral feeding.
van Heurn LW, Brink PR. The history of percutaneous tracheotomy. J Laryngol Otol 1996;110:723-6.
To the best of our knowledge, there is no previous study which aimed to identify independent factors predicting VAP onset in trauma patients undergoing tracheotomy during their ICU stay. In the multivariate analysis, our study shows that independent factors predicting VAP onset after tracheotomy were delayed tracheotomy and stomal infection. We hypothesize that stomal infection results mainly from secretions pooling above the endotracheal cuff. The risk of stomal infection could be also enhanced by bleeding events following tracheotomy. In fact, our univariate analysis revealed that these events were significantly higher in VAP (+) group. In a systematic review including 17 randomized controlled trials comparing percutaneous dialatationaltracheostmoy (PDT) and surgical tracheosotmy (ST), Delaney et al. reported that that PDT was associated to a significant reduction of wound infection and bleeding events regarding patients who underwent ST in the operating theatre. Thus, causality relation between both complications is highly suspected. The higher incidence of VAP in patients with stomal infection may be explained by oropharyngeal colonization with virulent microorganisms which can secondly invade airways and disseminate through the lungs.
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Previous studies reported that early weaning from mechanical ventilation was a major advantage that can be reached with tracheotomy.[9,10,20,28] In our study, patients who didn’t develop ventilator associated pneumonia were weaned faster than those who developed nosocomial pneumonia (5.9 ± 6.9 days Vs 10.8 ± 12.5 days; P = 0.037). This is not surprising as similar conclusions were found in trauma patients who were ventilated with endotracheal intubation. As a consequence, the onset of VAP was also associated with longer ICU LOS (31.9 ± 18.5 days Vs 23.3 ± 12.5 days; P = 0.01). These findings are particularly important. In fact, previous studies highlighted that early tracheotomy in trauma patients improves resource utilization with reduced mechanical ventilation duration and ICU LOS. Our study suggests that theses benefices seem to be lost with the occurrence of ventilator associated pneumonia. 250
Our study shows that late tracheotomy and stomal infections are independent factors predicting VAP onset in tracheotomized patients. VAP occurrence is associated with significantly longer mechanical ventilation and ICU LOS. These findings should incite physicians to avoid such complication by identifying patients who would need prolonged ventilation and thus, may benefit of early tracheotomy. Stomal infection should be prevented by multiple local aseptic cares. Secretions pooling above the canula cuff should be also avoided by repetitive suctioning. REFERENCES
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How to cite this article: Chaari A, Kssibi H, Zribi W, Medhioub F, Chelly H, Algia NB, et al. Ventilator-associated pneumonia in trauma patients with open tracheotomy: Predictive factors and prognosis impact. J Emerg Trauma Shock 2013;6:246-51.
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Received: 30.08.12. Accepted: 16.09.12. Source of Support: Nil. Conflict of Interest: None declared.
Journal of Emergencies, Trauma, and Shock I 6:4 I Oct - Dec 2013
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