Abstract
Purpose: :
To determine the diastolic ophthalmodynamometric pressure (DODP) during vitrectomy in patients with vitreoretinal disorders and to investigate the relationship between DODP and blood pressure.
Methods: :
This study included 118 eyes of 118 patients undergoing pars plana vitrectomy. After core vitrectomy, the intraocular pressure was gradually raised using Vented Gas Forced Infusion (VGFI; Alcon Accurus vitrectomy system), and the optic nerve head was continuously observed through a planoconvex contact lens. When the central retinal artery or its branches on the optic nerve head showed pulsations, the pressure was recorded as DODP. Systolic and diastolic blood pressures were measured using a sphygmomanometer simultaneously at the time of DODP measurement. Multiple regression analysis was performed to investigate the relationship between various explanatory variables and DODP. Explanatory variables tested were systolic and diastolic blood pressure, mean arterial blood pressure, age, presence of diabetic mellitus (DM) and hypertension (HT), body mass index, serum triglyceride, and serum total cholesterol.
Results: :
The DODP was 68.4 ± 12.5 mmHg (range 15.5 - 103.7 mmHg). Simple regression analysis showed that the DODP significantly correlated with diastolic blood pressure (r= 0.623, p < 0.0001), systolic blood pressure (r = 0.230, p < 0.05), and mean arterial blood pressure (r= 0.590, p < 0.0001). Multiple regression analysis revealed that DODP had a significant correlation with diastolic blood pressure (p < 0.0001), presence of DM (p = 0.027) and HT (p = 0.043), whereas other explanatory variables were not relevant. The DODP in DM group was lower than these in non-DM group (p < 0.0005), while the diastolic blood pressure was not significantly different between two groups. Similar results were obtained about HT.
Conclusions: :
We developed a new method to determine the DODP using VGFI system. The DODP was significantly associated with blood pressure, especially diastolic blood pressure. The DODP was lower in patients with DM and HT.
Keywords: vitreoretinal surgery • retinal connections, networks, circuitry