Hyperoxemia and Oxygen Reserve Index During Neurointerventional Anesthesia
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- Who runs it
- Fatih Sultan Mehmet Training and Research Hospital
- Trial code
- NCT07859982
- Record updated
- 6 October 2026
- Original description
The goal of this observational study is to learn how often high blood oxygen levels (hyperoxemia) occur in adults receiving general anesthesia for planned (elective) neurointerventional procedures, such as brain aneurysm coiling or other catheter-based treatments of brain vessels. It will also look at how well a non-invasive finger sensor measurement called the Oxygen Reserve Index (ORi) reflects arterial oxygen levels.Read full original descriptionShow less
Arterial Hyperoxemia and Oxygen Reserve Index During Elective Neurointerventional Procedures Under General Anesthesia: A Prospective Observational Study
The goal of this observational study is to learn how often high blood oxygen levels (hyperoxemia) occur in adults receiving general anesthesia for planned (elective) neurointerventional procedures, such as brain aneurysm coiling or other catheter-based treatments of brain vessels. It will also look at how well a non-invasive finger sensor measurement called the Oxygen Reserve Index (ORi) reflects arterial oxygen levels.
The main questions it aims to answer are:
* How often is the arterial oxygen pressure (PaO2) 150 mmHg or higher in blood gas samples taken as part of routine care during these procedures? * How does ORi relate to PaO2, and can ORi help identify high oxygen levels?
Participants will:
* Receive anesthesia and their procedure exactly as planned by their care team; the study does not change any treatment, oxygen setting, or ventilator setting. * Have a painless ORi sensor placed on a finger, similar to a standard pulse oximeter, during anesthesia. * Have their routine monitoring values and the results of arterial blood gas samples taken for routine clinical care recorded.
No extra blood samples will be taken for the study, and ORi values will not be used to guide care.
Inclusion: Age 18 years or older; American Society of Anesthesiologists (ASA) physical status I-III; Scheduled for an elective neurointerventional procedure; Procedure performed under general anesthesia; Invasive arterial pressure monitoring and arterial blood gas sampling planned as part of routine clinical care; Written informed consent obtained from the patient or, when required, the legal representative.
Exclusion: Chronic respiratory failure requiring long-term home oxygen therapy; Severe peripheral circulatory impairment or technical signal failure preventing reliable ORi measurement; Refusal to participate; Emergency neurointerventional procedure; ASA physical status IV or higher; Pregnancy; Mechanical ventilation before the procedure.