WordNet

a surgical procedure that removes the vitreous humor and replace it with saline solution

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2012/12/11 17:48:58」(JST)

wiki en

Single port 19-gauge vitrectomy

Vitrectomy is surgery to remove some or all of the vitreous humor from the eye. Anterior vitrectomy entails removing small portions of the vitreous from the front structures of the eye—often because these are tangled in an intraocular lens or other structures. Pars plana vitrectomy is a general term for a group of operations accomplished in the deeper part of the eye, all of which involve removing some or all of the vitreous—the eye's clear internal jelly.

Pars plana vitrectomy

Vitrectomy was originated by Robert Machemer^[1] with contributions from Thomas M. Aaberg, Sr in late 1969 and early 1970. The original purpose of vitrectomy was to remove clouded vitreous—usually containing blood.

The success of these first procedures led to the development of techniques and instruments to remove clouding and also to peel scar tissue off the light sensitive lining of the eye—the retina—membranectomy, to provide space for materials injected in the eye to reattach the retina such as gases or liquid silicone, and to increase the efficacy of other surgical steps such as scleral buckle.

The development of new instruments and surgical strategies through the 1970s and 1980s was spearheaded by surgeon/engineer Steve Charles, M.D.^[2] More recent advances have included smaller and more refined instruments for use in the eye, the injection of various medications at the time of surgery to manipulate a detached retina into its proper position and mark the location of tissue layers to allow their removal, and for long term protection against scar tissue formation.

Additional surgical steps

Vitrectomy instruments

Additional surgical steps involved as part of modern vitrectomy surgeries may include:

Membranectomy – removal of layers of unhealthy tissue from the retina with minute instruments such as forceps (tiny grasping tools), picks (miniature hooks), and visco-discection (separating layers or tissue with jets of fluid.)

Fluid-air exchange – injection of air into the eye to remove the intraocular fluid from the posterior segment of the globe while maintaining intraocular pressure to temporarily hold the retina in place or seal off holes in the retina. The air pressure is temporary as the posterior segment will soon re-fill with fluid.

Air-gas exchange – injection of gas, or more typically mixed gas and air, into the posterior segment of the globe. Typical gases used are perfluoropropane or sulfur hexafluoride. The gases are mixed with air to neutralize their expansive properties to provide for a longer acting (than air alone) retinal tamponade. The retinal tamponade acts to hold the retina in place or temporarily seal off holes in the retina. The mixed gases disappear spontaneously once they have accomplished their purpose and the posterior segment re-fills with fluid.^[3]

Silicone oil injection – filling of the eye with liquid silicone to hold the retina in place.^[3]

Photocoagulation – laser treatment to seal off holes in the retina or to shrink unhealthy, damaging blood vessels which grow in some diseases such as diabetes.^[3]

Scleral buckling – placement of a support positioned like a belt around the walls of the eyeball to maintain the retina in a proper, attached position.

Lensectomy – removal of the lens in the eye when it is cloudy (cataract) or if it is attached to scar tissue.^[3]

Indications

Conditions which can benefit from vitrectomy include:

Vitreous floaters – deposits of various size, shape, consistency, refractive index, and motility within the eye's normally transparent vitreous humour which can obstruct vision. Here pars plana vitrectomy has been shown to relieve symptoms.^[4] Because of possible side effects, however, it is used only in severe cases.

Retinal detachment – a blinding condition where the lining of the eye peels loose and floats freely within the interior of the eye. Steps to reattach the retina may include vitrectomy to clear the inner jelly, scleral buckling to create a support for the reattached retina, membranectomy to remove scar tissue, injection of dense liquids to smooth the retina into place, photocoagulation to bond the retina back against the wall of the eye, and injection of a gas or silicone oil to secure the retina in place as it heals.

Macular pucker – formation of a patch of unhealthy tissue in the central retina (the macula) distorting vision. Also called epiretinal membrane. After vitrectomy to remove the vitreous gel, membranectomy is undertaken to peel away the tissue.

Diabetic retinopathy – may damage sight by either a non-proliferative or proliferative retinopathy. The proliferative type is characterized by formation of new unhealthy, freely bleeding blood vessels within the eye (called vitreal hemorrhage) and/or causing thick fibrous scar tissue to grow on the retina, detaching it. Often diabetic retinopathy is treated in early stages with a laser in the physician's office to prevent these problems. When bleeding or retinal detachment occur, vitrectomy is employed to clear the blood, membranectomy removes scar tissue, and injection of gas or silicon with scleral buckle may be needed to return sight. Diabetics should have an eye exam yearly.

Macular holes – the normal shrinking of the vitreous with aging can occasionally tear the central retina causing a macular hole with a blind spot blocking sight.

Vitreous hemorrhage – bleeding in the eye from injuries, retinal tears, subarachnoidal bleedings (as Terson syndrome), or blocked blood vessels. Once blood is removed, photocoagulation with a laser can shrink unhealthy blood vessels or seal retinal holes.

Complications of vitrectomy

Along with the usual complications of surgery, such as infections, vitrectomy can result in retinal detachment. A more common complication is high intraocular pressure, bleeding in the eye, and cataract, which is the most frequent complication of vitrectomy surgery. Many patients will develop a cataract within the first few years after surgery.^[5]

Recovery after vitrectomy

Patients use eye drops for several weeks or longer to allow the surface of the eye to heal. In some cases heavy lifting is avoided for a few weeks. A gas bubble may be placed inside the eye to keep the retina in place. If a gas bubble is used, sometimes a certain head positioning has to be maintained, such as face down or sleeping on the right or left side. It is very important to follow the physician’s specific instructions. The gas bubble will dissolve over time, but this takes several weeks. Flying should be avoided while the gas bubble is still present. Problems such as return of the original condition, bleeding, or infection from the surgery may require additional treatment or can result in blindness. In the event that the patient would need to remain face down after surgery, a vitrectomy support system can be rented to help aid during the recovery time. This particular equipment may be used for as little as five days to as long as three weeks.

Vision after vitrectomy

The return of eyesight after vitrectomy depends on the underlying condition which prompted the need for surgery. If the eye is healthy but filled with blood, then vitrectomy can result in return of 20/20 eyesight. With more serious problems, such as a retina which has detached several times, final sight may be only sufficient to safely walk (ambulatory vision) or less.

Cultural references

In 1996, Spalding Gray (June 5, 1941 – ca. January 10, 2004), an American actor, screenwriter and playwright, released Gray's Anatomy, a film monologue describing his experiences dealing with a macular pucker and his decision to undergo surgery.

References

^ MacHemer, R (1995). "The development of pars plana vitrectomy: a personal account". Graefe's archive for clinical and experimental ophthalmology = Albrecht von Graefes Archiv fur klinische und experimentelle Ophthalmologie 233 (8): 453–68. PMID 8537019.
^ Wang, CC; Charles, S (1984). "Microsurgical instrumentation for vitrectomy: Part II". Journal of clinical engineering 9 (1): 63–71. PMID 10265855.
^ ^a ^b ^c ^d "16". Surgical Technology for the Surgical Technologist (2 ed.). Delmar Learning. 2004. pp. 580–581. ISBN 1-4018-3848-0.
^ Roth, M; Trittibach, P; Koerner, F; Sarra, G (2005). "Pars plana vitrectomy for idiopathic vitreous floaters". Klinische Monatsblätter für Augenheilkunde 222 (9): 728–32. doi:10.1055/s-2005-858497. PMID 16175483.
^ Benson WE, Brown GC, Tasman W, McNamara JA (1988). "Complications of vitrectomy for non-clearing vitreous hemorrhage in diabetic patients". Ophthalmic surgery 19 (12): 862–4. PMID 3231410.

UpToDate Contents

全文を閲覧するには購読必要です。 To read the full text you will need to subscribe.

1. 網膜剥離 retinal detachment
2. 眼の待機手術に対する麻酔 anesthesia for elective eye surgery
3. 糖尿病性網膜症：予防および治療 diabetic retinopathy prevention and treatment
4. 細菌性眼内炎 bacterial endophthalmitis
5. 真菌による眼内炎の治療 treatment of endophthalmitis due to molds

English Journal

Bacterial endophthalmitis associated with a broken and retained small-gauge vitrectomy cannula.

Wong RW1.
Retinal cases & brief reports.Retin Cases Brief Rep.2015 Summer;9(3):256-8. doi: 10.1097/ICB.0000000000000153.
PURPOSE: To report a case of bacterial endophthalmitis associated with a retained small-gauge vitrectomy trocar.METHODS: Retrospective case report of a 66-year-old woman who underwent 25-gauge vitrectomy surgery for an epiretinal membrane who presented with postoperative bacterial endophthalmitis an
PMID 26002142

Occlusive vasculitis due to hyperacute streptococcus mitis endophthalmitis after intravitreal ranibizumab.

Baxter KR1, Robinson JE, Ruby AJ.
Retinal cases & brief reports.Retin Cases Brief Rep.2015 Summer;9(3):201-4. doi: 10.1097/ICB.0000000000000138.
PURPOSE: To report a case of hyperacute Streptococcus mitis endophthalmitis after intravitreal ranibizumab resulting in occlusive vasculitis.METHODS: Retrospective case report with ultra-wide-field color fundoscopic and fluorescein angiographic imaging.RESULTS: An 83-year-old woman received an intra
PMID 25764316

Multidrug-resistant Pseudomonas aeruginosa endophthalmitis in a silicone oil-filled eye treated with piperacillin/tazobactam: report of a case and review of literature.

Goel N1, Bhambhwani V, Ghosh B.
International ophthalmology.Int Ophthalmol.2015 Jun 3. [Epub ahead of print]
The incidence of endophthalmitis after pars plana vitrectomy is low. Silicone oil is a tamponading agent which has anti-microbial activity. Post-operative endophthalmitis following vitrectomy with silicone oil tamponade has been rarely reported. We describe the case of a young male who underwent par
PMID 26031790

Japanese Journal

CLINICAL INVESTIGATION : Clinical practice pattern in management of diabetic macular edema in Japan : survey results of Japanese retinal specialists

Japanese journal of ophthalmology : the official international journal of the Japanese Ophthalmological Society 61(1), 43-50, 2017-01
NAID 40021064441

うつむき姿勢保持に対する温罨法およびマッサージによる苦痛緩和効果

日本看護技術学会誌 15(3), 235-244, 2017
NAID 130005330370

Clinical and histological evaluation of large macular hole surgery using the inverted internal limiting membrane flap technique

Clinical ophthalmology 11, 9-14, 2017
NAID 120005971290

Related Pictures

Vitrectomy Vitrectomy Surgery Vitrectomy and Vitreoretinal Procedures - AllAboutVision.com Vitrectomy surgery | Scott E. Pautler, M.D. Tampa Vitrectomy animation - YouTube Difference Between FOV and Vitrectomy - Treatment for Floaters Retinal Detachment and Floaters - Eagle Eye Centre Treatment of Diabetic Retinopathy and Macular Edema