Different techniques of transconjunctival cannulated vitrectomy versus conventional non-cannulated vitrectomy in various vitreoretinal disorders

Figures & data

Table 1 Preoperative diagnosis of the studied groups

Preoperative diagnosis	Group 1 20-gauge Claes system (n = 34)		Group 2 23-gauge (n = 32)		Group 3 20- and 23-gauge (n = 27)		Group 4 Conventional 20-gauge (n = 36)
	n	%	n	%	n	%	n	%
Vitreous hemorrhage	11	32.3	10	31.2	7	25.9	6	16.6
Tractional retinal detachment	12	35.3	7	21.8	10	37.0	5	13.8
Tractional rhegmatogenous retinal detachment	2	5.8	2	6.2	3	11.1	2	5.5
Vitreomacular traction and cystoid macular edema	1	2.9	3	9.3	1	3.7	0	0
Macular pucker	2	5.8	1	3.1	1	3.7	0	0
Macular hole	1	2.9	2	6.2	3	11.1	8	22.2
Rhegmatogenous retinal detachment	2	5.8	5	15.6	0	0	14	38.8
Vitreous opacification	2	5.8	1	3.1	2	7.4	0	0
Posterior dislocated lens	1	2.9	0	0	0	0	0	0
Dislocated intraocular lens	0	0	1	3.1	0	0	0	0
Intraocular foreign body	0	0	0	0	0	0	1	2.7
Total	34	26.3	32	24.8	27	20.9	36	27.9

Figure 1 The 20-gauge Claes system.

Figure 2 The two-step 23-gauge system.

Figure 3 The one-step 23-gauge system (Geuder).

Figure 4 The 20- and 23-gauge system.

Table 2 Operative sutures of the studied four groups

Operative sutures	Group 1 20-gauge Claes system (n = 34)		Group 2 23-gauge (n = 32)		Group 3 20- and 23-gauge (n = 27)		Group 4 Conventional 20-gauge (n = 36)
	n	%	n	%	n	%	n	%
Suture
No suture	17	50.0	21	65.6	6	22.2	0	0
One suture	5	14.7	7	21.9	13	48.1	0	0
Two sutures	7	20.6	1	3.1	6	22.2	0	0
Three sutures	5	14.7	3	9.4	2	7.4	36	100
X^2	118.48
P	0.0001a
	Group 1 versus group 3, P=0.023a
	Group 1 versus group 4, P=0.0001a
	Group 2 versus group 3, P=0.003a
	Group 2 versus group 4, P=0.0001a
	Group 3 versus group 4, P=0.0001a

Note:

a Significant (P < 0.05).

Table 3 Preoperative, 1-day postoperative, and 1-week postoperative intraocular pressure of patients of the studied groups

	Intraocular pressure (mmHg)
	Group 1 20-gauge Claes system (n = 34)	Group 2 23-gauge (n = 32)	Group 3 20- and 23-gauge (n = 27)	Group 4 Conventional 20 gauge (n = 36)	F-test P	Scheffe test
	Range Mean ± SD	Range Mean ± SD	Range Mean ± SD	Range Mean ± SD
Preoperative	6–26	8–17	8–23	5–25	3.090*	1 versus 4 P=0.045*
(I)	14.12 ± 4.20	12.38 ± 2.04	13.59 ± 3.90	11.78 ± 3.68	0.030
One-day	4–45	4–28	4–40	7–40	0.979	IV>I>III>II
postoperative	16.09 ± 8.43	14.69 ± 6.08	15.55 ± 7.28	17.69 ± 7.71	0.405
(II)
One-week	10–32	6–40	8–24	8–45	1.374	IV>I>II>III
postoperative	16.68 ± 5.96	16.31 ± 6.86	14.15 ± 4.75	17.64 ± 8.74	0.254
(III)
F-test	1.474	4.263	0.910	8.361
P	0.234	0.017*	0.406	0.0001*
Scheffe test	III>II>I	I versus III, P=0.018*	II>III>I	I versus II, P=0.003* I versus III, P=0.003*

Note:

* Significant (P < 0.05).

Abbreviation: SD, standard deviation.