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Results for “Vitrectomy”

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At least 1,009 records · Page 56Linked to original sources

PubMed2004

[Observation of early closure of idiopathic macular hole after vitrectomy surgery with internal limiting membrane peeling].

PURPOSE: To observe the early closure of idiopathic macular hole after vitrectomy surgery with internal limiting membrane (ILM) peeling. METHODS: Retrospectively, 25 eyes of idiopathic macular hole in 25 patients were performed vitrectomy surgery with ILM peeling from January of 2001 to October of 2003. All patients maintained the prone position at least 2 weeks after surgery. Slit-lamp examination and optical coherence topography (OCT) were performed to observe the closure of macular hole during 1 month post-operatively. RESULTS: All but 2 eyes of the ILM around the macular hole were peeled successfully. Slit lamp examination showed the configurations of macular hole disappeared in 23 eyes in 24-48 hours post-operatively and OCT confirmed the macular holes were closed in these eyes during 1 month after surgery. The anatomical closure rate was 92%. The repaired macular holes were classified by the OCT images as being of "simple closure" or "bridge shape". CONCLUSIONS: The majority of the idiopathic macular holes were closed in the early stage after surgery. It suggests that there are no or very little tissue loss in the process of idiopathic macular hole, after dismissing the mechanic traction caused by vitreous especially ILM, the hole could be closed.

Adult↗

PubMed2004

A case report of intraocular lens luxation with the capsular bag after vitrectomy.

We experienced a case of intraocular lens (IOL) luxation with the capsular bag after vitrectomy. The case was a 66-year-old female in whom an IOL was implanted one year after surgery for giant tear retinal detachment using silicone oil. Four years after the implantation surgery, the patient suffered subluxation of the IOL with the capsular bag. Examinations of the luxated IOL with the capsular bag using a stereoscopic microscope confirmed the presence of silicone oil droplets between the capsule and the IOL. Adhesion of vitreous body residues was observed in the capsule. Luxation of the IOL was thought to be connected with chronic inflammation resulting from the use of silicone oil and repeated vitrectomy. In addition to examining pathological findings of luxated IOL, it would also be important in the future to identify the pathology of the capsular bag.

Aged↗

PubMed2004

[Indications and results of vitrectomy in Terson syndrome].

Terson syndrome or vitreal hemorrhage associated with subdural hemorrhage is a rare condition. The goal of our work through a retrospective series of 3 cases (4 eyes) is to study clinical characteristics as well as adequate moment of surgery. All our patients had unilateral or bilateral visual impairement secondary to cerebral lesion. Ophtalmologic exam showed an intravitreal hemorrhage. Two of our patients were operated by vitrectomy, the third case had a spontaneous resorption of intravitreal hemorrhage and no surgery was performed. Functional prognosis depends on neuro-ophtalmologic sequellas. Ophtalmic exam is essential in cerebral hemorrhage. For intravitreal hemorrhage spontaneous resorption is frequent and vitrectomy must be delayed.

Adult↗

PubMed2004

Visual results and complications after trans pars plana vitrectomy and lensectomy for lens dislocation.

BACKGROUND: The aim of this study is to determine the relationship between the cause of lens dislocation and visual outcomes with complications in patients undergoing trans pars plana vitrectomy (TPPV) and trans pars plana lensectomy (TPPL) for lens dislocation. METHODS: This retrospective study was carried out from July 1995 through November 2003. After excluding patients with previous retinal detachment or combing lens dislocation and post-TPPV/TPPL follow-up intervals of less than 6 months, 36 eyes from 36 patients who had undergone vitrectomy and lensectomy for lens subluxation or dislocation due to trauma or intraocular surgery were examined. Their presenting features and complications were recorded. The relationship between the cause of lens dislocation and visual outcome with complications was tested using Fisher's exact test. RESULTS: The cause of lens dislocation included blunt and penetrating eye trauma, and intraocular surgery. Final best-corrected visual acuity was 20/40 or better in 45% of eyes in the traumatic arm and in 31% of eyes in the iatrogenic arm. Visual acuity improved after TPPV/TPPL in 90% of the eyes in the traumatic arm and in 81% of the eyes in the iatrogenic arm. Of all of the eyes, 39% had significant complications affecting postoperative visual outcomes, including retinal detachment, cystoid macular edema, vitreous hemorrhage and glaucoma. CONCLUSIONS: There were no significant differences in visual outcomes and complications between the traumatic and iatrogenic arms of the study. Therefore, the cause of lens dislocation was not a predictor of visual outcomes. Nonetheless, posterior segment complications including retinal detachment and glaucoma were major causes of poor postoperative visual outcomes.

Adult↗

PubMed2002

[Affection on oxygen tension of the lens after vitrectomy].

PURPOSE: To measure the oxygen tension (PO2) in the rabbit vitreous and lens and to investigate the mechanism by which it is controlled, the affection on oxygen tension of the lens after vitrectomy was studied. METHODS: Using a fiber-optic oxygen sensor system, oxygen tension of the rabbit vitreous and lens was probed in vivo and oxygen permeability of posterior capsule was also measured on isolated rabbit lens. RESULTS: It was found that with agreement with previous study, PO2 is relatively high and the PO2 gradient is large in vitreous body close to the retina whereas more than 0.5 mm away from the retina the vitreal PO2 is relatively low and the PO2 gradient is very shallow. Oxygen tension in the lens is asymmetric with the anterior being higher than the posterior and oxygen in the posterior lens being at the similar tension as the anterior vitreous behind the lens. The posterior capsule of the rabbit lens is relatively high in oxygen permeability. CONCLUSIONS: The vitreous body plays a key role in maintaining a low and stable level of oxygen in the lens. After vitrectomy oxygen tension in the lens may increase.

Animals↗

PubMed2005

[Terson's syndrome, pars plana vitrectomy and anatomical and functional outcome].

The retrospective case review was aimed to demonstrate anatomical and functional results of pars plana vitrectomy (PPV) in patients with Terson's syndrome (TS). The most common cause of TS was an acute subarachnoid hemorrhage of ruptured intracranial aneurysm (6 eyes). One patient suffered traumatic subdural and subarachnoid hemorrhage. PPV was performed in 7 eyes of 6 patients (2 women and 4 men). The patients ranged in age from 18 to 53 years (average 37.5 year), the mean age was 37.5 years. The interval between intracranial hemorrhage and PPV varied from 2 to 12 month (average 7.5 months). The visual acuity postoperatively improved in all 7 eyes. The mean period of observation was 12.5 month. Intraoperative complications included retinal break (1) only. Late complications included epiretinal membrane (2), glaucoma (1), cataract (2) and conjunctival cyst (1). Pars plana vitrectomy is highly effective and relatively safe method in hastening visual rehabilitation of adults with Terson's syndrome.

Adolescent↗

PubMed2005

[Vitrectomy--absolute indication in case of intraocular foreign body localized in vitreous cavity or within vitreo-retinal interface].

Ocular trauma is the leading cause of visual loss in young adults. Open globe injuries with intraocular foreign bodies are an important part of this group, and in general an early surgery is required, in order to preserve the visual acuity and the eye globe. Primary surgical repair and foreign body removal may be performed using external magnet or vitrectomy. Based on published reports and our clinical experience we think that vitrectomy is safer procedure, giving better chance for good postoperative visual outcome.

Eye Foreign Bodies↗

PubMed1992

Effect of vitrectomy and cytopreparatory techniques on cell survival and preservation.

Obtaining vitreous fluid by means of vitrectomy frequently results in a specimen that is difficult to assess cytologically. We devised an experimental model to examine the effect of the vitrector on human leukemic cancer (HL60) cells in suspension and to evaluate the cytopreparatory techniques of membrane filtration and cytocentrifugation. Eighteen 3-mL specimens of cells at concentrations ranging from 1 to 9 x 10(5)/mL were vitrectomized, and eighteen 3-mL control samples matched for cell concentration were obtained atraumatically. No significant difference in cell loss, as determined by means of staining with nigrosin vital dye, was found at any cell concentration between the vitrectomized and control specimens. The specimens were then processed cytologically. On cytologic assessment it was not possible to distinguish the vitrectomized and control specimens. A higher degree of cell preservation was noted at higher cell concentrations regardless of the cytopreparatory technique, but at lower concentrations membrane filtration resulted in a higher proportion of cytologically assessable specimens than did cytocentrifugation (42% vs. 22%). The results suggest that the vitrector causes minimal cellular damage and that to obtain optimal results both cytopreparatory techniques should be used with all vitrectomy specimens.

Cell Count↗

PubMed2006

[25G transconjunctival vitrectomy for epiretinal membranes and vitreo-macular traction syndromes: results after 6 months].

PURPOSE: to evaluate the safety and efficacy of the 25G transconjunctival vitrectomy in the treatment of epimacular membranes and vitreo-macular traction syndromes. METHODS: in this prospective study dealing with a consecutive series of 38 eyes with an epimacular membrane or a vitreo-macular traction syndrome, we recorded mainly the visual acuity the day before surgery, at day 1, 8 and 6 months after surgery, duration of surgery, and complications peroperatively, at day 1, 8, and at 6 months. RESULTS: 23 eyes had a 6-month follow-up (60%). Mean preoperative, day 1, day 8 and 6-month distance visual acuities were 0.3, 0.2, 0.4 and 0.5, respectively. Mean preoperative and 6-month near visual acuities were P4 and P3, respectively. At day 1 and day 8, 14/38 eyes (31%) and 33/37 eyes (89%), respectively, had a distance visual acuity equal or superior to the preoperative visual acuity. At 6 months, 16/23 eyes (70%) had a distance visual acuity improvement of at least 2 lines. 13/23 eyes (57%) had a near visual acuity improvement of at least 2 levels. Mean duration of surgery was 19 minutes (7 - 40'). Short-term complications were very few, and none were encountered afterwards. CONCLUSION: the 25G transconjunctival vitrectomy is a safe, effective, and convenient technique in the treatment of epimacular membranes and vitreomacular traction syndromes.

Adult↗

PubMed2005

Triamcinolone-assisted pars plana vitrectomy for retinal disease.

PURPOSE: To determine whether triamcinolone acetonide (TA ) staining facilitates posterior hyaloid removal in patients undergoing pars plana vitrectomy (PPV) for retinal disease. METHODS: A triamcinolone acetonide(TA)-assisted vitrectomy was performed on patients with the following disease: proliferative diabetic retinopathy (5 eyes), central retinal vein occlusion (5 eyes), macuar hole (3 eyes), and epiretinal membrane (2 eyes). Eyes without apparent preoperative posterior vitreous detachment were enrolled in this study. After a core PPV, TA aqueous suspension (40 mg/ml) was injected into the mid vitreous cavity to visualize the posterior hyaloid, thus allowing a complete posterior hyaloid separation and removal. The visual acuity, intraocular pressure (IOP), tamponade, corneal pathology, after-cataract, vitreous hemorrhage, and necessity for reoperation were thereafter examined for at least 3 months after surgery. RESULTS: In all patients, the vitreous body was clearly seen by means of triamcinolone during surgery, and complete removal of posterior hyaloid was facilitated and confirmed. Retina was attached in 14 of 15 eyes, and vision acuity was improved in 9 of 15 eyes. Two eyes showed transient postoperative IOP elevation, 2 eyes had after cataract formation and l eye had cataract progression. Vitreous hemorrhage occurred in 1 eye. No eye had corneal pathology. CONCLUSION: Triamcinolone improved the visibility of the hyaloid and the safety of surgical procedures during PPV. No obvious adverse effect due to toxicity of TA accrued in TA-assisted PPV.

Diabetic Retinopathy↗

PubMed1991

Pars plana vitrectomy for macular degenerative disorders.

We describe nine patients (10 eyes) treated with pars plana vitrectomy for vitreous hemorrhage secondary to disciform macular degeneration. Nine of the eyes showed improved acuity at about 3 months and at the last follow-up visit (6 to 30 months). Two of the patients had ambulatory acuity (counting fingers or better) before surgery, compared with all the patients at the last follow-up visit. Vitrectomy may be beneficial in this subgroup of patients with macular degeneration.

Aged↗

PubMed1991

Modified vitrectomy for impending macular holes.

We report a consecutive series of 13 eyes (11 patients) treated with pars plana vitrectomy, in which surgical manipulation of the prefoveal layer of cortical vitreous was avoided, for stage I (eight eyes) and stage II (five eyes) macular hole formation. Average follow up was 8.1 months (range, 2 to 13 months). There was no significant improvement in vision in the patients with stage II macular holes; however, vision in these patients stabilized and did not fall below 20/400. Visual acuity improved in seven of the eight patients with stage I holes. The results for both these groups achieved by our modified vitrectomy, which is relatively easy to perform and involves minimal intraoperative manipulation of the fovea, are consistent with those obtained by methods involving more aggressive cortical vitreous stripping of the fovea.

Aged↗

PubMed1991

[Dosage errors and their prevention in intraocular SF6 injection for endotamponade in pneumatic retinopexy and after vitrectomy].

Sulfur hexafluoride (SF6) is used for internal tamponade during retinal detachment surgery. It is usually injected into the eye by a plastic syringe either with a sharp needle or by using the infusion system during pars plana vitrectomy. Although several suggestions exist for the appropriate application of intraocular SF6 and other perfluocarbons, a sudden postoperative rise in tension or hypotonia has been observed repeatedly. We simulated the preparation and application of mixtures of sulfur hexafluoride and air and analyzed possible mistakes. SF6 was quantitatively analyzed by infrared spectroscopy. SF6 does not rapidly diffuse out of capped plastic syringes made of polypropylene, as commonly employed in the Federal Republic of Germany. SF6 and air mix completely during aspiration. If the volume of microporefilters or tubes being used for preparation and instillation of mixtures of SF6 and air is ignored, this may result in a 20% deviation in SF6 concentration. Silicone tubes, which are widely used for the influsion during pars plana vitrectomy, are not recommended for the application of SF6. SF6 and fluorcarbones diffuse through silicone tubes and absorb and desorbe in the tube. Infusion lines made of polyethylene or polyvinylchloride, e.g. butterflies, should be preferred.

Dose-Response Relationship, Drug↗

PubMed1991

[Late results of the treatment of suppurative endophthalmitis by vitrectomy].

The authoress discusses the late results of treatment in 14 patients with infective endophthalmitis by vitrectomy. She compared the results of treatment of 13 patients with the same condition treated by conventional methods. The received data enabled to confirm the thesis that vitrectomy combined with an intraocular antibiotic therapy is a method of choice in the treatment of purulent endophthalmitis. The late observations demonstrated that favourable results have a lasting character.

Adolescent↗

PubMed1991

[Vitrectomy for nondiabetic vitreous hemorrhage].

Fifty cases (fifty-three eyes) of nondiabetic vitreous hemorrhage underwent vitrectomy. The visual acuity improved in 39 eyes (73.6%) postoperatively. Twenty seven eyes obtained a visual acuity of 0.05 or better. The postoperative vision was related to the etiology and macular function. Vitreous hemorrhage due to blunt trauma responded best. All of them had vision improved. Eales's disease also had a good result. 77% was improved in vision postoperatively. The main complications of surgery were recurrent vitreous hemorrhage and secondary glaucoma, especially hemolytic glaucoma (4/6). The timing for vitrectomy, degree of cutting and hemolytic glaucoma were briefly discussed.

Adolescent↗

PubMed1991

Phacoemulsification combined with pars plana vitrectomy.

Phacoemulsification combined with pars plana vitrectomy was performed on seven patients with both cataracts and vitreoretinal disease. Six of the seven had a posterior chamber intraocular lens (PC-IOL) placed in the capsular bag following cataract extraction. Visual acuities ranging from light perception to hand movement preoperatively, postoperatively ranged from hand movement to 20/25. There were no perioperative complications. During an average follow-up of more than 6 months, neovascular glaucoma developed in one patient, and a conjunctival cyst in another. The PC-IOLs were well tolerated. The small limbal incision used in phacoemulsification allows better control during the vitrectomy procedure and ensures a water-tight wound. In addition, with the limbal approach, the posterior lens capsule is maintained, with all the attendant advantages.

Adult↗

PubMed1990

[Endogenous candida endophthalmitis. Early diagnosis and early vitrectomy improve the prognosis].

Our records on endogenous Candida endophthalmitis in 13 eyes in 10 patients are presented. The diagnosis was confirmed by culture from vitreous aspirate or serologic examination. The records show that cases with immediate diagnosis and treatment by antimycotics and vitrectomy have a better prognosis than late diagnosis or treatment without vitrectomy. Only the 4 cases that were vitrectomized within 4 weeks after onset of the complaints resulted in good visual acuity (greater than 2/5). The other cases were often complicated by traction, retinal scars or choroidal proliferation. Unclear uveitis with a high risk for fungal infection in the patient's history should be evaluated for Candida infection. Every patient with candidemia needs periodic ophthalmologic examinations for endophthalmitis. Diagnosis, treatment and possible prevention of endogenous Candida endophthalmitis are discussed.

Adolescent↗

PubMed1990

Nylon suture toxicity after vitrectomy surgery.

A patient underwent an uneventful pars plana vitrectomy with superior sclerotomies closed with 8-0 nylon suture. Four months later, the patient had a suture reaction presumably related to allergy to the suture itself. The signs and symptoms resolved after removal of the suture. Although similar cases have been reported after nylon sutures in cataract wound closure, this is the first reported occurrence of this phenomenon in vitrectomy surgery to our knowledge.

Female↗