Abstract
Purpose. To evaluate the oxygen saturation in retinal blood vessels in patients after closed-globe blunt ocular trauma. Design. Retrospective observational case series. Methods. Retinal oximetry was performed in both eyes of 29 patients with unilateral closed-globe blunt ocular trauma. Arterial oxygen saturation (SaO2), venous oxygen saturation (SvO2), arteriovenous difference in oxygen saturation (SO2), arteriolar diameter, venular diameter, and arteriovenous difference in diameter were measured. Association parameters including age, finger pulse oximetry, systolic pressure, diastolic pressure, and heart rate were analyzed. Results. The mean SaO2 in traumatic eyes (98.1% ± 6.8%) was not significantly different from SaO2 in unaffected ones (95.3% ± 7.2%) (p = 0.136). Mean SvO2 in traumatic eyes (57.1% ± 10.6%) was significantly lower than in unaffected ones (62.3% ± 8.4%) (p = 0.044). The arteriovenous difference in SO2 in traumatic eyes (41.0% ± 11.2%) was significantly larger than in unaffected ones (33.0% ± 6.9%) (p = 0.002). No significant difference was observed between traumatic eyes and unaffected ones in arteriolar (p = 0.249) and venular diameter (p = 0.972) as well as arteriovenous difference in diameter (p = 0.275). Conclusions. Oxygen consumption is increased in eyes after cgBOT, associated with lower SvO2 and enlarged arteriovenous difference in SO2 but not with changes in diameter of retinal vessels.
Highlights
Closed-globe blunt ocular trauma may cause various structural and functional damage in posterior segment, including commotio retinae, traumatic optic neuropathy, and choroid rupture
SvO2 was significantly lower in traumatic eyes than unaffected ones (p = 0.044), but no significant difference was observed in SaO2 (p = 0.136)
The difference value was greater in traumatic eyes than in unaffected ones (p = 0.002) (Figure 2)
Summary
Closed-globe blunt ocular trauma (cgBOT) may cause various structural and functional damage in posterior segment, including commotio retinae, traumatic optic neuropathy, and choroid rupture. Study showed that peak systolic velocity of central retinal artery was significantly decreased 4 weeks after injury and this hemodynamic disturbance appeared to correlate with dynamic change of thickness of retinal nerve fiber layer [4]. These studies mainly are emphasized on the blood supply of retinal blood vessels, and, as far as we know, no study was reported on SO2 and diameter in cgBOT as well as the relationship between SO2 and systemic conditions
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