Intraoperative PEEP Optimization: Effects on Postoperative Pulmonary Complications and Inflammatory Response
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|ClinicalTrials.gov Identifier: NCT02931409|
Recruitment Status : Completed
First Posted : October 13, 2016
Last Update Posted : April 2, 2019
|Condition or disease||Intervention/treatment||Phase|
|Pulmonary Complications Inflammatory Response||Procedure: Optimal PEEP Procedure: Standard PEEP||Not Applicable|
Patients undergoing general anesthesia and mechanical ventilation during major abdominal surgery commonly develop pulmonary atelectasis or even hyperdistension of the lungs can occur leading to adverse consequences either intraoperatively or postoperatively. Lung protective ventilation (LPV, PEEP = 6 cmH2O, TV = 6 mL/Kg IBW and regular recruitments) during the intraoperative period can reduce the risk of ventilator induced lung injury (VILI) and prevent the formation of pulmonary atelectasis.
In our investigator-initiated, double-center, single-blinded, prospective, randomized, controlled clinical trial a total number of 40 patients with bladder cancer undergoing open radical cystectomy and urinary diversion (ileal conduit or orthotopic bladder substitute) will be enrolled and randomized into two groups. Standard lung protective mechanical ventilation with the use of 6 cmH2O of PEEP and low tidal volumes (6mL/Kg IBW), a fraction of inspired oxygen (FiO2) of 0.5 and a respiratory rate to maintain an end tidal carbon dioxide (ETCO2) between 35-40 mmHg will be performed in control group, and a strategy of lung protective mechanical ventilation applying an optimal, individual PEEP determined by static pulmonary compliance (Cstat) directed PEEP titration procedure will be performed in study group.
During preoperative assessment, respiratory failure risk index (RFRI) will be recorded and informed consent will be obtained. Regarding to the protocol, a central vein catheter will be placed on the day before surgery, serum procalcitonin (PCT) level will be measured and a chest X-ray examination will be performed.
Before induction of anesthesia, an epidural catheter and an arterial canula for invasive blood pressure monitoring will be inserted. Immediately after induction of anesthesia and orotracheal intubation, all patients will be submitted to an alveolar recruitment maneuver (ARM) using the sustained airway pressure by the CPAP method, applying 30 cmH2O PEEP for 30 seconds. After ARM PEEP will be set to 6 cmH2O in the control group ("standard PEEP") and LPV will be performed. In the study group ("optimal PEEP") PEEP will be set to 14 cmH2O and a Cstat directed decremental PEEP titration procedure will be performed (every 4 minutes PEEP will be decreased by 2 cmH2O, until a final PEEP of 6 cmH2O) to determine the best individual PEEP. During surgery ARM will be repeated and arterial and central vein blood gas samples (ABGs, CVBGs) will be evaluated every 60 minutes. PCT levels will be measured 2, 6, 12, 24, 48 and 72 hours after surgical incision.
After extubation, patients will be addmitted to the Department of Anesthesiology and Intensive Care. ABGs and CVBGs will be collected and evaluated, PaO2/FiO2 and dCO2 will be calculated every 6 hours until 72 hours after surgery. On the first postoperative day chest X-ray will be performed and repeated on the following days if developing of pulmonary complications were suspected. Continuous epidural analgesia will be introduced, and evaluated effective if numeric pain rating scale point would be lower than 3 points.
During postoperative care continuous intraabdominal pressure (IAP) monitoring via a direct intraperitoneal catheter placed before closure of the abdominal wall will be performed to eliminate bias caused by the elevation of intraabdominal pressure.
Patients' clinical progress and secondary endpoints will be monitored by daily SOFA Scores, laboratory and physical examinations.
During follow-up period in-hospital stay, 28-days and in-hospital mortality will also be evaluated.
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||40 participants|
|Intervention Model:||Parallel Assignment|
|Official Title:||Intraoperative PEEP Optimization: Effects on Postoperative Pulmonary Complications and Inflammatory Response. A Double-center, Prospective, Randomized Controlled Trial|
|Study Start Date :||October 2016|
|Actual Primary Completion Date :||March 31, 2019|
|Actual Study Completion Date :||March 31, 2019|
Experimental: Optimal PEEP
Patients submitted to general anesthesia and open radical cystectomy and urinary diversion (20 subjects) will be submitted an alveolar recruitment maneuver using the sustained airway pressure by the CPAP method, applying 30 cmH2O PEEP for 30 seconds followed by a decremental PEEP titration procedure directed by static pulmonary compliance (Cstat). During PEEP titration procedure PEEP will be decreased from 14 cmH2O by 2 cmH2O every 4 minutes, until a final PEEP of 6 cmH2O. Optimal PEEP is considered as a PEEP value resulting the highest possible Cstat measured by ventilator. After PEEP titration procedure a lung protective mechanical ventilation will be performed using optimal PEEP and low tidal volumes (6 mL/Kg IBW).
Procedure: Optimal PEEP
Optimal PEEP determined by Cstat during PEEP titration procedure.
Active Comparator: Standard PEEP
Patients submitted to general anesthesia and open radical cystectomy and urinary diversion (20 subjects) will be submitted an alveolar recruitment maneuver using the sustained airway pressure by the CPAP method, applying 30 cmH2O PEEP for 30 seconds followed by a standard lung protective mechanical ventilation using a PEEP value of 6 cmH2O and low tidal volumes (6 mL/Kg).
Procedure: Standard PEEP
Lung protective mechanical ventilation applying a PEEP value of 6 cmH2O
- Postoperative Pulmonary Complications [ Time Frame: 72 hours ]New infiltrates or atelectasis on chest X-ray, abnormal breathing sounds on auscultation, excessive bronchial secretions, unexplained fever, respiratory failure defined as PaO2/FiO2 < 300 or need for non-invasive or invasive ventilatory support.
- Procalcitonin Kinetics [ Time Frame: 72 hours ]Serum procalcitonin levels during and after surgery.
- Incidence of Circulatory Failure [ Time Frame: 28 days ]Severe hypotension, arrhytmias, decreased cardiac output, severe metabolic acidosis, congestive heart failure, acute coronary syndrome, pulmonary embolism and cardiac arrest.
- Incidence of Gastrointestinal Dysfunctions [ Time Frame: 28 days ]Constipation or ileus, anastomotic leakage and need for urgent reoperation, disorders of liver function.
- Incidence of Renal Dysfunction [ Time Frame: 28 days ]RIFLE Criteria
- Incidence of Hematologic and Coagulation Disorders [ Time Frame: 72 hours ]Severe bleeding and/or coagulopathy
- Infection [ Time Frame: 28 days ]Any infections except from pneumonia.
- ICU days [ Time Frame: 28 days ]Defined as a period from the first postoperative day until emission from the ICU.
- In-hospital Stay [ Time Frame: 28 days ]From the day of surgery until emission from hospital.
- Mortality [ Time Frame: 28 days ]In-hospital and 28 days mortality.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT02931409
|University of Szeged, Faculty of Medicine, Department of Anaesthesiology and Intensive Therapy|
|Szeged, Csongrád, Hungary, 6722|
|Péterfy Sándor Hospital|
|Budapest, Pest, Hungary, 1076|
|Study Director:||Zsolt Molnár, Prof, MD, PhD, DEAA||University of Szeged, Faculty of Medicine, Department of Anaesthesiology and Intensive Therapy|
|Principal Investigator:||Zoltán Ruszkai, MD||Péterfy Sándor Hospital, Department of Anaesthesiology and Intensive Care|