Clinical Trials Logo

Clinical Trial Summary

The aim of the prospective crossover study is to investigate the effect of individualized positive end-expiratory pressure (PEEP) on measures of tissue oxygenation, compared with low PEEP.


Clinical Trial Description

During surgery on the lung, ventilation of one lung at a time is often necessary. During thoracic surgery requiring one-lung ventilation (OLV), hypoxemia (reduced oxygen tension in blood) can present a clinical challenge. Due to multiple factors, the likelihood of hypoxemia during OLV in obese patients is increased. Atelectasis (collapse of the lung airspaces) contributes to hypoxemia and can be mitigated by application of recruitment maneuvers and positive end-expiratory pressure (PEEP). A recruitment maneuver is a breath given in a mechanically ventilated patient that helps to open up collapsed air spaces, and PEEP is application of a continuous amount of positive pressure that helps keep the air spaces open at the end of an exhaled breath. Adjusting the level of PEEP to each individual patient's optimal lung compliance (individualized PEEP) improves blood oxygen levels compared to application of standard low PEEP (5 cmH2O); however, higher levels of PEEP required to achieve optimal lung compliance could increase intrathoracic pressures to a level that impedes normal circulation. This could negatively affect blood flow (cardiac output) and delivery of oxgyen to vital organs.

Evidence addressing OLV in obese patients is lacking. The purpose of this study is to compare brain oxygen levels (cerebral oxygen saturation) and measures of blood flow and gas exchange during OLV with individualized PEEP vs low standard PEEP in obese patients undergoing thoracic surgery. To our knowledge, there is no previous study that compares oxygen delivery to vital organs (such as the brain) during OLV using individualized PEEP versus standard low PEEP, in an obese patient population.

In this study, subjects undergoing OLV during surgery to remove a portion of the lung (lobectomy) will undergo a process to determine their individualized PEEP and then two 20-minute experimental periods-- one period with OLV with low PEEP and one period with OLV with individualized PEEP. Measurements of cerebral oxygen saturation, blood oxygen levels, cardiac output, and blood pressure medication dose will be measuring before and after these experimental periods during surgery. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT03569774
Study type Interventional
Source University of Iowa
Contact Dionne Peacher, MD
Phone 319-467-6793
Email dionne-peacher@uiowa.edu
Status Not yet recruiting
Phase N/A
Start date September 4, 2018
Completion date December 15, 2019

See also
  Status Clinical Trial Phase
Recruiting NCT03042897 - Exercise and Diet Intervention in Promoting Weight Loss in Obese Patients With Stage I Endometrial Cancer N/A
Recruiting NCT03227575 - Effects of Brisk Walking and Regular Intensity Exercise Interventions on Glycemic Control N/A
Recruiting NCT01870947 - Assisted Exercise in Obese Endometrial Cancer Patients N/A
Recruiting NCT03255005 - Endomina Controlled Study N/A
Enrolling by invitation NCT03063606 - Behavioral and Pharmacologic Treatment of Binge Eating and Obesity: Specialist Treatment Phase 2/Phase 3
Terminated NCT03299881 - Safety and Effectiveness of Transcutaneous Electrical Nerve Stimulation (TENS)-Assisted Weight Loss N/A
Completed NCT03317587 - Inspiring Nutritious Selections and Positive Intentions Regarding Eating and Exercise (INSPIRE) N/A
Active, not recruiting NCT03610958 - Safety and Performance Evaluation of the Epitomee Device for Enhancing Satiety and Weight Loss. N/A
Completed NCT02235961 - Investigate Safety, Tolerability and Pharmacokinetics for Single Doses of NNC9204-0530 Alone and in Combination With Liraglutide in Overweight to Obese But Otherwise Healthy Male Subjects Phase 1
Completed NCT03195712 - Metabolically Healthy Obesity: Correlations Between BMI and Metabolic Syndrome Biomarkers N/A
Recruiting NCT00341406 - Fat Cell Size in Insulin Resistance
Not yet recruiting NCT03470272 - Effects of Red Light LED Therapy on Body Contouring N/A
Not yet recruiting NCT03538236 - Intragastric Balloon With Lifestyle Intervention vs. Lifestyle Intervention in Obese Patients With NASH N/A
Recruiting NCT03241121 - Study of Eating Patterns With a Smartphone App and the Effects of Time Restricted Feeding in the Metabolic Syndrome N/A
Active, not recruiting NCT02918279 - Effect of Liraglutide for Weight Management in Pubertal Adolescent Subjects With Obesity Phase 3
Completed NCT00494767 - Investigation Of Weight Loss And Body Composition Changes After Dosing With Either Placebo Or One Of Two Active Drugs Phase 1
Recruiting NCT03338296 - Study to Evaluate the Efficacy and Safety of Belviq XR® in Conjunction With Lifestyle Modification for Weight Loss in Obese Adolescents, Age 12 to 17 Years Phase 4
Recruiting NCT03277040 - Diet, Eating, and Lifestyle Improvement for Valued Employees and Their Relatives N/A
Active, not recruiting NCT03345368 - Effect of rTMS in Combination With a Low-carb Diet in Patients With Obesity N/A
Completed NCT01222793 - Effects of Antipsychotics on Eating and Food Craving in People With Schizophrenia N/A