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Gas-Lesion Contact and Postural Compliance After Vitrectomy With Tamponade: A Continuous Monitoring and 3D
Hyunmin Na1, Changhoon Baek2, Seung Woo Choi1
1Department of Ophthalmology, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea.
Translational Vision Science & Technology
|June 30, 2026
Summary
Post-vitrectomy patients had suboptimal adherence to prone positioning, impacting gas-lesion contact. Sulfur hexafluoride (SF6) requires strict adherence, while octafluoropropane (C3F8) offers more consistent coverage for retinal detachment repair.
Area of Science:
- Ophthalmology
- Biomedical Engineering
- Retinal Surgery
Background:
- Pars plana vitrectomy is a common surgical procedure for various retinal conditions.
- Postoperative positioning is crucial for gas tamponade to achieve effective gas-retinal lesion contact.
- Current methods for assessing patient adherence to positioning are often subjective and lack precision.
Purpose of the Study:
- To quantitatively assess postoperative head positioning behavior after vitrectomy.
- To estimate gas-retinal lesion contact using a wearable accelerometer and geometric modeling.
- To evaluate the impact of different gas tamponades (SF6 vs. C3F8) on gas-lesion contact.
Main Methods:
- 56 patients undergoing vitrectomy were monitored for 7 days using an accelerometer-equipped eyeshield.
- Three-dimensional head orientation was recorded continuously.
- A geometric model integrated gas dynamics, lesion location, and head orientation to estimate gas-lesion contact.
Main Results:
- Prone positioning adherence averaged 49.8% and decreased over the week.
- Gas-lesion contact averaged 90.5% and was lower at night.
- Octafluoropropane (C3F8) showed better gas-lesion contact than sulfur hexafluoride (SF6) despite variable compliance.
Conclusions:
- A quantitative framework for assessing postural behavior and gas-lesion contact was established.
- SF6 requires strict adherence for adequate contact, while C3F8 offers more consistent coverage.
- Findings can inform postoperative counseling and tamponade selection for retinal detachment.
