A randomised controlled trial of adjunctive triamcinolone acetonide in eyes undergoing vitreoretinal surgery for open globe trauma - the ASCOT study.

Background

Eyes sustaining open globe trauma are at high risk of severe visual impairment. Proliferative vitreoretinopathy is the most common cause of retinal detachment and visual loss in eyes with open globe trauma. There is evidence from experimental studies and pilot clinical trials that the use of adjunctive steroid medication triamcinolone acetonide can reduce the incidence of proliferative vitreoretinopathy and improve outcomes of surgery for open globe trauma.

Objective

The Adjunctive Steroid Combination in Ocular Trauma or ASCOT study aimed to investigate the clinical effectiveness of adjunctive triamcinolone acetonide given at the time of vitreoretinal surgery for open globe trauma.

Design

A phase 3 multicentre double-masked randomised controlled trial randomising patients undergoing vitrectomy following open globe trauma to either adjunctive triamcinolone acetonide or standard care.

Setting

Hospital vitreoretinal surgical services dealing with open globe trauma.

Participants

Patients undergoing vitrectomy surgery who had sustained open globe trauma.

Interventions

Triamcinolone acetonide 4 mg/0.1 ml into the vitreous cavity and 40 mg/1 ml sub-Tenon's or standard vitreoretinal surgery and postoperative care.

Main outcome measures

The primary outcome was the proportion of patients with at least 10 letters of improvement in corrected visual acuity at six months. Secondary outcomes included retinal detachment secondary to proliferative vitreoretinopathy, retinal reattachment, macula reattachment, tractional retinal detachment, number of operations, hypotony, elevated intraocular pressure and quality of life. Health-related quality of life was assessed using the EuroQol Five Domain and Visual Function Questionnaire 25 questionnaires.

Results

A total of 280 patients were randomised; 129 were analysed from the control group and 130 from the treatment group. The treatment group appeared, by chance, to have more severe pathology on presentation. The primary outcome (improvement in visual acuity) and principal secondary outcome (change in visual acuity) did not demonstrate any treatment benefit for triamcinolone acetonide. The proportion of patients with improvement in visual acuity was 47% for triamcinolone acetonide and 43% for standard care (odds ratio 1.03, 95% confidence interval 0.61 to 1.75,

Conclusions

The use of combined intraocular and sub-Tenon's capsule triamcinolone acetonide is not recommended as an adjunct to vitrectomy surgery for intraocular trauma. Secondary outcome measures are suggestive of a negative effect of the adjunct, although the treatment group appeared to have more severe pathology on presentation.

Future work

The use of alternative adjunctive medications in cases undergoing surgery for open globe trauma should be investigated. Refinement of clinical grading and case selection will enable better trail design for future studies.

Trial registration

This trial is registered as ISRCTN 30012492, EudraCT number 2014-002193-37, REC 14/LNO/1428, IRAS 156358, Local R&D registration CHAD 1031.

Funding

This project was funded by the National Institute for Health and Care Research (NIHR) Health Technology Assessment programme (12/35/64) and will be published in full in

Despite advances in surgical techniques, eye trauma remains a leading cause of blindness and visual impairment. The main cause of trauma is a scarring process within the eye – proliferative vitreoretinopathy. There is good evidence from laboratory work and small-scale clinical studies that the addition of a steroid medication, triamcinolone acetonide, given in and around the eye at the time of surgery for eye trauma, can reduce the incidence of proliferative vitreoretinopathy scarring and improve the outcomes of surgery. The Adjunctive Steroid Combination in Ocular Trauma or ASCOT study was a multicentre clinical trial designed to test the use of triamcinolone acetonide as an addition to surgery to improve outcomes in eyes with ‘open globe’ penetrating injuries. A total of 280 patients were recruited and randomised to receive standard surgery or surgery with the additional steroid (triamcinolone acetonide). No benefit was found from the addition of the steroid medication. The addition of steroid medication was not good value for money. Secondary outcome measures suggested that triamcinolone acetonide may have had a negative effect on outcomes, although this may have been due to the presence of more severe cases amongst the patients allocated to receive the additional steroid (triamcinolone acetonide). The use of adjunctive triamcinolone acetonide in eye trauma cases undergoing surgery is therefore not recommended. Future studies with different additional medications and/or more targeted case selection are indicated to improve outcomes for eyes experiencing penetrating trauma.