The Effect of Altitude on Intraocular Pressure in Vitrectomized Eyes with Sulfur Hexafluoride Tamponade by the Friedenwald Method: Rabbit Animal Model
Table 4
Regression lines and slopes per case and per scleral rigidity coefficient (estimates for human eyes).
Case
Regression
IOP increase/100 m altitude rise mmHg (95% CI)
Significance (95% CI) Benchmark: 100% SF6
Friedenwald
100% SF6
2.1 (1.7 to 2.5)
50% SF6
1.8 (0.6 to 3.0)
NS
100% Air
1.4 (0.3 to 2.5)
NS
25% SF6
1.1 (0.2 to 2.0)
NS
Pneum
0.4 (−0.4 to 1.3)
Sig
BSS
0.1 (−0.6 to 0.9)
Sig
Dastiridou mean
100% SF6
2.2 (1.8 to 2.6)
50% SF6
1.9 (0.7 to 3.1)
NS
100% Air
1.5 (0.3 to 2.6)
NS
25% SF6
1.2 (0.2 to 2.1)
NS
Pneum
0.4 (−0.5 to 1.3)
Sig
BSS
0.1 (−0.6 to 0.9)
Sig
Pallikaris
100% SF6
1.0 (0.7 to 1.3)
50% SF6
0.9 (0.3 to 1.5)
NS
100% Air
0.7 (0.1 to 1.3)
NS
25% SF6
0.6 (0.1 to 1.1)
NS
Pneum
0.2 (−0.3 to 0.7)
Sig
BSS
0.1 (−0.4 to 0.5)
Sig
Dastiridou max
100% SF6
4.4 (4.0 to 4.8)
50% SF6
3.8 (1.4 to 6.1)
NS
100% Air
2.8 (0.9 to 4.8)
NS
25% SF6
2.1 (0.5 to 3.7)
Sig
Pneum
0.7 (−0.7 to 2.1)
Sig
BSS
0.2 (−0.9 to 1.3)
Sig
Linear regression estimation for human eyes. IOP: intraocular pressure. SF6: sulfur hexafluoride. BSS: balanced saline solution. Pneum: rabbit eye without vitrectomy and 100% SF6. NS: not significant. Sig: significant.
