Immediate subretinal fluid displacement from the buoyant force of a small gas bubble in pneumatic retinopexy

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Wei Wei Lee ◽  
Arun Ramachandran ◽  
Hesham Hamli; ◽  
Luis C Escaf ◽  
Aditya Bansal ◽  
...  
Keyword(s):  
Subretinal Fluid ◽  
Gas Bubble ◽  
Buoyant Force ◽  
Fluid Displacement ◽  
Pneumatic Retinopexy

Pneumatic Retinopexy

2009 ◽  
Author(s):  
Daniel A. Brinton ◽  
Charles P. Wilkinson
Keyword(s):  
Sulfur Hexafluoride ◽  
Subretinal Fluid ◽  
Maximum Size ◽  
Gas Bubble ◽  
Retinal Break ◽  
Maximum Expansion ◽  
Pneumatic Retinopexy ◽  
Partial Pressures ◽  
The Law ◽  
Surrounding Fluid

Pneumatic retinopexy (PR) is an office-based, sutureless, no-incision alternative to scleral buckling or vitrectomy for the surgical repair of selected retinal detachments. Cryotherapy is applied around the retinal break(s) to form a permanent seal. A gas bubble is injected into the vitreous cavity, and the patient is positioned so that the bubble closes the retinal break(s), allowing resorption of the subretinal fluid (Figure 8–1A–F). As an alternative to cryotherapy, laser photocoagulation can be applied after the intraocular gas has caused the retina to reattach. Sulfur hexafluoride (SF6) is the gas most frequently used with pneumatic retinopexy. Perfluorocarbon gases such as perfluoropropane (C3F8) are sometimes used, and success has also been reported with sterile room air. In selecting a gas, it is important to understand the longevity and expansion characteristics of the gases. SF6 doubles in volume within the eye, reaching its maximum size at about 36 hours. It will generally disappear within about 10–14 days, depending on the amount injected. Perfluoropropane nearly quadruples in volume, reaching maximum size in about three days. The bubble will last 30–45 days in the eye. Room air does not expand, but immediately starts to reabsorb. The air bubble will be gone within just a few days (Table 8–1). The initial expansion of SF6 and C3F8 is due to the law of partial pressures and the solubility coefficients of the gases involved. A 100% SF6 bubble injected into the eye contains no nitrogen or oxygen, but these gases are dissolved in the fluid around the bubble. Due to the law of partial pressures, nitrogen and oxygen will diffuse into the gas bubble. SF6 also starts to diffuse out of the gas bubble into the surrounding fluid which contains no SF6. However, nitrogen and oxygen diffuse across the gas–fluid interface much more quickly than SF6 because of the relative insolubility of SF6. The net result is an initial influx of gas molecules into the bubble, expanding its size until partial pressures equilibrate, net influx equals net egress, and maximum expansion is reached. Then the bubble gradually reabsorbs as the SF6 is slowly dissolved in the surrounding fluid.

Delayed Subretinal Fluid Absorption after Pneumatic Retinopexy

Ophthalmology ◽  
1989 ◽  
Vol 96 (12) ◽  
pp. 1691-1700 ◽  
Author(s):  
Clement K. Chan ◽  
Izak F. Wessels
Keyword(s):  
Subretinal Fluid ◽  
Fluid Absorption ◽  
Pneumatic Retinopexy

Pneumatic retinopexy preceded by drainage of subretinal fluid for the treatment of severe bullous retinal detachment

2020 ◽  
Author(s):  
Francesco Morescalchi ◽  
Andrea Russo ◽  
Federico Gandolfo ◽  
Mario Carnazza ◽  
Hassan Bahja ◽  
...  
Keyword(s):  
Retinal Detachment ◽  
Subretinal Fluid ◽  
Pneumatic Retinopexy ◽  
Bullous Retinal Detachment

Pneumatic retinopexy with drainage of subretinal fluid

1994 ◽  
Vol 18 (3) ◽  
pp. 143-147 ◽  
Author(s):  
Kaan G�nd�z ◽  
Ilhan G�nalp
Keyword(s):  
Subretinal Fluid ◽  
Pneumatic Retinopexy

scholarly journals Pneumatic retinopexy combined with scleral buckling in the management of relatively complicated cases of rhegmatogenous retinal detachment: A multicenter, retrospective, observational consecutive case series*

2017 ◽  
Vol 46 (1) ◽  
pp. 316-325 ◽  
Author(s):  
Chuandi Zhou ◽  
Qiurong Lin ◽  
Yuxin Wang ◽  
Qinghua Qiu
Keyword(s):  
Retinal Detachment ◽  
Rhegmatogenous Retinal Detachment ◽  
Case Series ◽  
Subretinal Fluid ◽  
Scleral Buckling ◽  
Success Rates ◽  
Pneumatic Retinopexy ◽  
The Mean ◽  
Final Operation

Objective To evaluate the efficacy of maximal pneumatic retinopexy (PR) and subretinal fluid (SRF) drainage combined with scleral buckling (SB) in the treatment of complicated rhegmatogenous retinal detachment (RRD). Methods Patients with RRD who underwent maximal PR and SRF drainage combined with SB from June 2007 to June 2012 were included in this multicenter retrospective study. The outcome measures were the primary and final operation success rates and best-corrected visual acuity (BCVA). Results In total, 159 consecutive patients were included. The mean follow-up period was 13.76 ± 1.97 months. Primary operation success was achieved in 146/159 (91.82%) eyes. After salvage management, the final reattachment rate increased to 98.11%. All eyes had improved BCVA, with 62/159 (38.99%) attaining BCVA of ≥20/40. Conclusions Maximal PR and SRF drainage combined with SB achieved satisfactory anatomical and visual recovery in relatively complicated cases of RRD. The decreased need for vitrectomy makes this surgical approach more widely available.

Delayed Reabsorption of Subretinal Fluid after Pneumatic Retinopexy

Ophthalmology ◽  
1990 ◽  
Vol 97 (6) ◽  
pp. 695 ◽  
Author(s):  
John S. Ambler ◽  
Sanford M. Meyers ◽  
Hernando Zegarra
Keyword(s):  
Subretinal Fluid ◽  
Pneumatic Retinopexy
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