Effect of different surgical positions on intraocular pressure: a cross-sectional study

BMC Ophthalmology

Table 4 Univariate and multivariate analysis of the IOP difference between after and before surgery

Variable	Univariate		Multivariate
Variable	β	P	β	P
Position
Supine position	Ref		Ref	-
Prone position	7.019	< 0.01	9.300	< 0.01
Lateral position	10.399	< 0.01	11.230	< 0.01
Lithotomy position	4.187	< 0.01	3.626	< 0.01
Heart rate after admission	0.022	0.44
Systolic pressure after admission	0.027	0.07
Diastolic pressure after admission	0.012	0.16
Oxygen saturation after admission	-0.006	0.93
Baseline intraocular pressure	-0.543	< 0.01	-0.778	< 0.01
Sex
Male	1.234	0.08
Previous medical history
Yes	-0.531	0.46
BMI	0.176	0.07
Duration of operation(h)	0.771	< 0.01
Use of hormone drugs	-1.749	0.47
Age	0.034	0.15
Infusion volume during surgery	0.002	< 0.01
Urine volume during surgery	-0.001	0.15
Blood loss during surgery	0.002	0.12
Access volume	0.002	< 0.01

Baseline IOP was the IOP at 10 min of lying down after general anesthesia. The IOP difference in different positions before and after surgery was calculated as follows: 1) prone position: the IOP difference between before exiting the operation room and 10 min of lying down after general anesthesia; 2) all of supine position, lateral position, and Lithotomy position: the IOP difference between the end of surgery and 10 min of lying down after general anesthesia. IOP in lateral position was the IOP on the compressed side, otherwise, it was the mean on both sides in other positions. BMI = weight/height² (kilograms /m²)

ISSN: 1471-2415