Variations in Oxygen Reserve Index in Different Fresh Gas Flow Rate
Overview
- Phase
- Not Applicable
- Intervention
- Not specified
- Conditions
- Oxygen Reserve Index
- Sponsor
- Sakarya University
- Enrollment
- 64
- Locations
- 1
- Primary Endpoint
- Oxygen Reserve Index Value
- Status
- Completed
- Last Updated
- last year
Overview
Brief Summary
Our primary objective is to determine whether oxygen reserve index ORI can be a reliable and sensitive indicator of hypoxia and hyperoxia in low-flow anesthesia settings. Our secondary objective is to investigate the ORI changes during preoxygenation stage.
Investigators
Burak Kaya
Medical Doctor, Specialist
Sakarya University
Eligibility Criteria
Inclusion Criteria
- •ASA I-III patients
- •18-75 years old
- •underwent general anesthesia
- •elective ear, nose and throat surgery, lasting longer than 60 minutes
Exclusion Criteria
- •who did not consent to participate,
- •those with finger deformities
- •unregulated diabetes mellitus, severe heart, kidney, or liver failure, sensitivities to local anesthetics or opioids, those who were morbidly obese (BMI \>40 kg/m²), and breastfeeding women.
Outcomes
Primary Outcomes
Oxygen Reserve Index Value
Time Frame: For each patient, from preoxygenation stage to the end of the general anesthesia
The Oxygen Reserve Index (ORI) is a real-time monitoring measure that captures the oxygen reserve status in the moderate hyperoxic range (PaO2 approximately 100 to 200 mmHg). ORI provides early warning of potential oxygenation disturbances before any changes occur in SpO2 and indicates the response to oxygen therapy. ORI ranges from 1 (high reserve) to 0 (no reserve) and measures changes in mixed venous oxygen saturation (SvO2) optically after arterial oxygen saturation reaches 100%.