TY - JOUR
T1 - Aqueous oxygen tension in glaucomatous and nonglaucomatous eyes
AU - Sharifipour, Farideh
AU - Yazdani, Shahin
AU - Pakravan, Mohammad
AU - Idani, Esmaeil
PY - 2013/10
Y1 - 2013/10
N2 - PURPOSE:: To compare aqueous oxygen tension in eyes with primary open-angle glaucoma (POAG), pseudoexfoliation glaucoma (PXG), and neovascular glaucoma (NVG), with normal eyes with senile cataracts. PATIENTS AND METHODS:: This study included 82 eyes of 82 patients with POAG (22 eyes), PXG (20 eyes), NVG (18 eyes), and cataracts (22 eyes). Before initiating surgery and while breathing room air, 0.2 mL of aqueous humor and 1 mL of arterial blood were aspirated in heparinized syringes under sterile conditions. Partial pressures of oxygen (PO2), carbon dioxide (PCO2), and pH of the samples were measured using a blood-gas analyzer. RESULTS:: Overall, aqueous PO2 was comparable among the study groups (P=0.202). After repeating the analysis in eyes with controlled and high intraocular pressure (IOP), a significant difference was observed in POAG eyes with high IOP (post-hoc test, P=0.046). Overall, a significant negative correlation (r=-0.184, P=0.045) was observed between IOP and aqueous PO2. The strongest correlation was observed in the POAG group (r=-0.507, P=0.016). Aqueous PO2 was higher than arterial PO2 in all study groups except POAG eyes, significantly so in the cataract and PXG groups (P=0.013 and P<0.001, respectively), implying a contribution of atmospheric oxygen to aqueous PO2. This contribution was lower in POAG eyes but the difference failed to reach statistical significance (P=0.262). CONCLUSIONS:: Aqueous oxygen tension was lower in POAG eyes with high IOP. A significant negative correlation was observed between IOP and aqueous PO2. Aqueous PO2 was higher than arterial PO2 suggesting a contribution by atmospheric oxygen.
AB - PURPOSE:: To compare aqueous oxygen tension in eyes with primary open-angle glaucoma (POAG), pseudoexfoliation glaucoma (PXG), and neovascular glaucoma (NVG), with normal eyes with senile cataracts. PATIENTS AND METHODS:: This study included 82 eyes of 82 patients with POAG (22 eyes), PXG (20 eyes), NVG (18 eyes), and cataracts (22 eyes). Before initiating surgery and while breathing room air, 0.2 mL of aqueous humor and 1 mL of arterial blood were aspirated in heparinized syringes under sterile conditions. Partial pressures of oxygen (PO2), carbon dioxide (PCO2), and pH of the samples were measured using a blood-gas analyzer. RESULTS:: Overall, aqueous PO2 was comparable among the study groups (P=0.202). After repeating the analysis in eyes with controlled and high intraocular pressure (IOP), a significant difference was observed in POAG eyes with high IOP (post-hoc test, P=0.046). Overall, a significant negative correlation (r=-0.184, P=0.045) was observed between IOP and aqueous PO2. The strongest correlation was observed in the POAG group (r=-0.507, P=0.016). Aqueous PO2 was higher than arterial PO2 in all study groups except POAG eyes, significantly so in the cataract and PXG groups (P=0.013 and P<0.001, respectively), implying a contribution of atmospheric oxygen to aqueous PO2. This contribution was lower in POAG eyes but the difference failed to reach statistical significance (P=0.262). CONCLUSIONS:: Aqueous oxygen tension was lower in POAG eyes with high IOP. A significant negative correlation was observed between IOP and aqueous PO2. Aqueous PO2 was higher than arterial PO2 suggesting a contribution by atmospheric oxygen.
KW - aqueous
KW - glaucoma
KW - oxygen tension
UR - http://www.scopus.com/inward/record.url?scp=84885313402&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84885313402&partnerID=8YFLogxK
U2 - 10.1097/IJG.0b013e318255bc62
DO - 10.1097/IJG.0b013e318255bc62
M3 - Article
C2 - 23059477
AN - SCOPUS:84885313402
SN - 1057-0829
VL - 22
SP - 608
EP - 613
JO - Journal of Glaucoma
JF - Journal of Glaucoma
IS - 8
ER -