Obesity Clinical Trial
Official title:
Effect of Transpulmonary Pressure Guided Ventilation on Intraoperative Right Heart Function
The purpose of this clinical trial is to determine whether different types of ventilator settings during surgery change the relationship between the pressures in the lungs and the function of the heart. In this study, patients will be randomly assigned (like flipping a coin) to receive either standard or individualized (research) lung protective ventilator settings. Before surgery, patients will be given an 8-item verbal questionnaire about any respiratory symptoms. After patients are asleep for surgery, an ultrasound probe will be inserted into the esophagus (food pipe) and stomach to examine the heart and lungs and take ultrasound pictures. The ultrasound probe is then removed. Next, a small balloon catheter (a narrow tube smaller in diameter than a pencil lead) will be placed in the esophagus, where it will be used to measure the pressures in the chest and lungs. For patients who are assigned to standard ventilator settings, the ventilator settings and pressures during surgery will be recorded. For patients assigned to individualized (research) ventilator settings, the pressures from the balloon catheter will be used to adjust the ventilator settings every 30 minutes during surgery. A second ultrasound pictures of the heart and lungs will be obtained at the point at which the patient is placed into the Trendelenburg position. At the end of surgery and before the patient is awake, the balloon catheter will be removed, the ultrasound probe will be inserted, a third set of ultrasound pictures of the heart and lungs will be obtained, and the ultrasound probe then removed. Patients will be telephoned 30 days after surgery to ask about their recovery. The 8-item respiratory symptom questionnaire will be repeated at this time.
Status | Not yet recruiting |
Enrollment | 50 |
Est. completion date | March 15, 2026 |
Est. primary completion date | October 15, 2025 |
Accepts healthy volunteers | No |
Gender | All |
Age group | 18 Years and older |
Eligibility | Inclusion Criteria: - Patients undergoing robotic-assisted laparoscopic surgery at University of Vermont Medical Center in Trendelenburg position - Age = 18 years - Signed consent form Exclusion Criteria: - Inability to sign consent form - Inability to speak English - Emergent surgery - Current smoker - Smoking history =20 pack years - Esophageal pathology: Strictures, varices, history of esophageal dilatation or surgery - Intrinsic lung disease (e.g. asthma, COPD, emphysema, interstitial lung disease, lung cancer) - Impaired cardiac function (e.g. decreased ejection fraction, wall motion abnormalities, or cardiomyopathy). - Any other co-morbid condition that, in the opinion of the study investigators, may interfere with study participation. |
Country | Name | City | State |
---|---|---|---|
United States | University of Vemont Medical Center | Burlington | Vermont |
Lead Sponsor | Collaborator |
---|---|
University of Vermont Medical Center |
United States,
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Eichler L, Truskowska K, Dupree A, Busch P, Goetz AE, Zollner C. Intraoperative Ventilation of Morbidly Obese Patients Guided by Transpulmonary Pressure. Obes Surg. 2018 Jan;28(1):122-129. doi: 10.1007/s11695-017-2794-3. — View Citation
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Futier E, Constantin JM, Paugam-Burtz C, Pascal J, Eurin M, Neuschwander A, Marret E, Beaussier M, Gutton C, Lefrant JY, Allaouchiche B, Verzilli D, Leone M, De Jong A, Bazin JE, Pereira B, Jaber S; IMPROVE Study Group. A trial of intraoperative low-tidal-volume ventilation in abdominal surgery. N Engl J Med. 2013 Aug 1;369(5):428-37. doi: 10.1056/NEJMoa1301082. — View Citation
Grieco DL, Anzellotti GM, Russo A, Bongiovanni F, Costantini B, D'Indinosante M, Varone F, Cavallaro F, Tortorella L, Polidori L, Romano B, Gallotta V, Dell'Anna AM, Sollazzi L, Scambia G, Conti G, Antonelli M. Airway Closure during Surgical Pneumoperitoneum in Obese Patients. Anesthesiology. 2019 Jul;131(1):58-73. doi: 10.1097/ALN.0000000000002662. — View Citation
Lellouche F, Dionne S, Simard S, Bussieres J, Dagenais F. High tidal volumes in mechanically ventilated patients increase organ dysfunction after cardiac surgery. Anesthesiology. 2012 May;116(5):1072-82. doi: 10.1097/ALN.0b013e3182522df5. — View Citation
PROVE Network Investigators for the Clinical Trial Network of the European Society of Anaesthesiology; Hemmes SN, Gama de Abreu M, Pelosi P, Schultz MJ. High versus low positive end-expiratory pressure during general anaesthesia for open abdominal surgery (PROVHILO trial): a multicentre randomised controlled trial. Lancet. 2014 Aug 9;384(9942):495-503. doi: 10.1016/S0140-6736(14)60416-5. Epub 2014 Jun 2. — View Citation
Sundar S, Novack V, Jervis K, Bender SP, Lerner A, Panzica P, Mahmood F, Malhotra A, Talmor D. Influence of low tidal volume ventilation on time to extubation in cardiac surgical patients. Anesthesiology. 2011 May;114(5):1102-10. doi: 10.1097/ALN.0b013e318215e254. — View Citation
Talmor D, Sarge T, Malhotra A, O'Donnell CR, Ritz R, Lisbon A, Novack V, Loring SH. Mechanical ventilation guided by esophageal pressure in acute lung injury. N Engl J Med. 2008 Nov 13;359(20):2095-104. doi: 10.1056/NEJMoa0708638. Epub 2008 Nov 11. — View Citation
Tharp WG, Murphy S, Breidenstein MW, Love C, Booms A, Rafferty MN, Friend AF, Perrapato S, Ahern TP, Dixon AE, Bates JHT, Bender SP. Body Habitus and Dynamic Surgical Conditions Independently Impair Pulmonary Mechanics during Robotic-assisted Laparoscopic Surgery. Anesthesiology. 2020 Oct 1;133(4):750-763. doi: 10.1097/ALN.0000000000003442. — View Citation
Type | Measure | Description | Time frame | Safety issue |
---|---|---|---|---|
Primary | To determine whether intraoperative transpulmonary pressure (TPP)-guided ventilation alters right heart function. | TEE measurements of right ventricular function will be compared between subjects randomized to standard ventilation or TPP-guided ventilation. | TEE studies will be performed immediately after intubation, while in steep Trendelenburg position, and just before desufflation of the abdomen. | |
Secondary | To determine the effect of obesity and surgical conditions on right heart function. | Transesophageal echocardiographic (TEE) measurements of right ventricular function will be compared between lean and obese subjects, and between surgical stages. | TEE studies will be performed immediately after intubation, while in steep Trendelenburg position, and just before desufflation of the abdomen. |
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