Incidence of Epiretinal Membrane Formation After Pars Plana Vitrectomy for Giant Retinal Tear-Associated Retinal Detachment

Figures & data

Table 1 Difference in Clinical Variables of the Eyes with and without Postoperative Epiretinal Membrane

Variable		ERM (-) (n=5)	ERM (+) (n=12)	P-value
Age (years) (mean ± SD)	53.1 (±8.4)	51.0 (± 13.6)	53.8 (± 5.9)	0.519
Gender (n, %): men	15 (88.2)	4 (80)	12 (91.7)	0.496
Laterality (n, %): OD	11 (64.7)	3 (60)	8 (66.7)	0.793
Lens status (n, %): phakic	9 (69.2)	2 (40.0)	7 (58.3)	0.490
Macula status (n, %): on	8 (47.1)	3 (60)	5 (41.6)	0.707
Number of tears (mean ± SD)	1.4 ± 0.7	1.00 (± 0)	1.45 (± 0.69)	0.127
Total clock hours of GRT (mean ± SD)	4.09± 1.16	4.20 (± 1.3)	3.77 (± 0.72)	0.807
PVR at presentation (n,%): yes	4 (23.5)	1 (20.0)	3 (25)	0.825
Cystoid macula edema (n,%): yes	11 (64.7)	3 (60.0)	8 (66.7)	0.793
Tamponade used (n,%): SO vs C3F8	9 (69.2)	3 (60.0)	6 (50.0)	0.707
Use of medium-term tamponade with PFCL (n,%): yes	6 (35.3)	2 (40.0)	4 (33.3)	0.793
Primary repair type (PPV vs PPV/SB): PPV (n,%)	10 (53.8)	3 (60.0)	7 (58.3)	0.949
Anatomic success (n, %): yes	17 (100)	5 (100)	12 (100)	-
Intraoperative cryopexy (n, %): yes	4 (23.5)	2 (40.0)	2 (16.6)	0.301
Intraoperative endodiathermy (n,%): yes	6 (35.3)	1 (20.0)	5 (41.6)	0.394
Preoperative BCVA (logMAR) (mean ± SD)	0.99 (±0.89)	1.26 (±0.88)	0.95 (± 0.90)	0.432
Final BCVA (log MAR) (mean ± SD)	0.5±0.49	0.28 (± 0.18)	0.60 (±0.58)	0.247
Days until ERM formation (mean ± SD): yes	-	-	191.08 (± 144.94)	-
Subsequent membrane peel (n,%): yes	7 (41.1)	-	7 (58.3)	-

Abbreviations: ERM, epiretinal membrane; GRT, giant retinal tear; ILM, internal limiting membrane; logMAR, logarithm of the minimum angle of resolution; PPV, pars plana vitrectomy; SD, standard deviation; SB, scleral buckle.

Table 2 Anatomic and Functional Visual Outcomes in Patients with Giant Retinal Tear Associated-RD Repair

	Mac-on (n=8)	Mac-off (n=9)	Total (n=17)
LogMAR pre-op BCVA, mean (range)	0.19 (0–0.5)	1.7 (0.5–2.3)	0.99 (0–2.3)
LogMAR final BCVA, mean (range)	0.28 (0–0.5)	0.7 (0.2–1.9)	0.5 (0–1.9)
Final BCVA≥ 20/40, n(%)	6 (75)	4 (44.4)	10 (58.8)
Final BCVA≥ 20/400, n(%)	8 (100)	8 (88.8)	16 (94.1)
Anatomic success, n (%)	8 (100)	9 (100)	17 (100)
Days until ERM formation, mean (range)	210.6 (80–335)	186.7 (38–543)	199.5 (38–543)

Abbreviations: BCVA, best corrected visual acuity; ERM, epiretinal membrane; logMAR, logarithm of the minimum angle of resolution.

Figure 1 Preoperative and final BCVA by macula status. Final BCVA was the visual acuity obtained at the most recent visit. More than half of the patients with ERM required subsequent membrane peel to achieve their final BCVA.