Actively Recruiting
Flow-Controlled Versus Volume-Controlled Ventilation in Bariatric Surgery
Led by Ankara Etlik City Hospital · Updated on 2026-02-25
40
Participants Needed
1
Research Sites
51 weeks
Total Duration
On this page
AI-Summary
What this Trial Is About
This prospective trial aims to compare the effects of flow-controlled ventilation (FCV) and volume-controlled ventilation (VCV) on intraoperative airway pressures and oxygenation in bariatric surgery under general anesthesia. Obesity is associated with altered respiratory mechanics, reduced functional residual capacity, and increased airway pressures, making the selection of an optimal ventilation strategy particularly important in this patient population. Adult patients aged 18-65 years with a body mass index ≥30 kg/m² and American Society of Anesthesiologists (ASA) physical status II-III will be allocated to receive either FCV or VCV as part of routine intraoperative mechanical ventilation. Ventilatory parameters, including peak and plateau airway pressures, pulmonary compliance, will be recorded at predefined intraoperative time points. The primary endpoint of the study is the PaO₂ value measured at the 20th minute under an FiO₂ of 0.8-1.0. By providing comparative data on respiratory mechanics and oxygenation, this study aims to contribute to the identification of lung-protective ventilation strategies and to optimize intraoperative ventilatory management in bariatric surgery.
CONDITIONS
Official Title
Flow-Controlled Versus Volume-Controlled Ventilation in Bariatric Surgery
Who Can Participate
Eligibility Criteria
You may qualify if you...
- Age between 18 and 65 years
- Body mass index (BMI) 30 30 kg/m6
- ASA physical status II or III
You will not qualify if you...
- ASA physical status I or IV and above
- Known or previously diagnosed pulmonary disease
- Severe preoperative pulmonary function impairment (e.g., FEV1 < 50% predicted, severe restrictive or obstructive pathology)
- Markedly altered lung anatomy or function due to prior major thoracic surgery
- Dependence on supplemental oxygen therapy in the preoperative period
- Refusal to participate or inability to comply with study procedures
AI-Screening
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Trial Site Locations
Total: 1 location
1
Ankara Etlik City Hospital
Ankara, Turkey (Türkiye), 06000
Actively Recruiting
How is the study designed?
Study Type
INTERVENTIONAL
Masking
SINGLE
Allocation
RANDOMIZED
Model
PARALLEL
Primary Purpose
TREATMENT
Number of Arms
2
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