Key Factors to Improve the Outcome of Retinal Reattachment Surgery in Proliferative Vitreoretinopathy and Proliferative Diabetic Retinopathy

Table 1

Parameters of population and surgery (retrospective versus prospective) and their statistical relation.

Number of eyes/patients	101 (retro)	103 (pro)	value
Age, years			0.0005^1
Mean ± SD	63.35 ± 13.32	57.08 ± 11.81
Range	26–101	22–86
Gender, number			0.99^2
Male	65	66
Female	36	37
Eye, number			0.48^2
Right	51	57
Left	50	46
Preop. fovea situation			0.94^2
Attached	21	22
Washed up	15	18
Detached	60	63
Not specified	5	0
Redetachment rate			4 ×
None	65	96
Permanent oil fill	4	4
Redetachment ≥4 months	7	1
Redetachment 1–4 months	4	1
Redetachment <1 months	21	1
Surgeon‘s skill, years			0.002^2
1–7 years	49	25
≥7 years	36	54
≥25 years	16	24
Timing of cataract surgery			0.06^2
Primary pseudophakic	29	41
With silicone oil fill	8	3
With revision surgery	35	41
In the course	29	18
P(D)VR stage			0.71^2
AB/A	26	33
C1/B	12	13
C2/C1	18	16
C3/C2	15	20
D1/C3	9	14
D2, D3/D1	11	7
Not specified	10	0
Viscosity of silicone oil			0.01^2
5000 mPa·s	80	69
4300 mPa·s	4	6
2000 mPa·s	13	28
Not specified	4	0
Laser coagulation (amount and efficiency)			0.11^2
Grade 6	10	6
Grade 5	27	30
Grade 4	20	33
Grade 3	21	24
Grade 2	11	9
Grade 1	7	1
Not rated	5	0
Amount of membrane peeling			<
VB + PVD + ERM + ILM peeling	4	79
VB + PVD + ERM peeling	22	11
VB + PVD	72	12
VB	3	1
Consistency of surgeon			0.76^2
In one hand	26	30
2 surgeons	19	16
>2 surgeons	55	57
Not specified	1	0
Kind of revision
2-port	74	0
3-port	23	103
Not specified	4	0
Peeling at the time of revision			0.82^2
Performed	18	17
Not performed	81	83
Not specified	2	3
Axial length			0.0007^2
Patho. myopic	12	19
Myopic	19	38
Emmetropic	37	33
Hyperopic	25	8
Not specified	8	5
Number and size of retinal hole area			0.004^2
1 (macula hole, giant tear, 360° tear)	13	15
2 (>5 holes, <10 hrs)	8	15
3 (>2 < 5 holes, <8 hrs)	9	22
4 (=2 holes, <6 hrs)	12	17
5 (=1 hole, <4 hrs)	32	22
6 (hidden hole, <2 hrs)	27	11
Not specified	0	1
Retino/retinectomy			0.11^2
1 (retinectomy 360°)	0	0
2 (retinectomy 90–180°, 2 retinot. post. to the equator)	7	5
3 (retinectomy <90°, 1 retinot. post. to the equator)	18	16
4 (2 retinot. ant. to the equator)	3	0
5 (1 retinot. ant. to the equator)	15	8
6 (not performed)	58	74

Statistical analysis: ¹two-sample t-test: *²χ² contingency table. Number: number of patients; SD: standard deviation; mPa·s: millipascal·second; VB: vitreous body; PVD: posterior vitreous detachment; ERM: epiretinal membrane; ILM: membrana limitans interna; retinot.: retinotomy; post.: posterior; ant.: anterior; preop.: preoperative; patho.: pathological.