Abstract
PurposeTo evaluate retinal function by intraoperative electroretinograms (ERGs) before and after core vitrectomy.DesignRetrospective consecutive case series.MethodFull-field photopic ERGs were recorded prior to the beginning and just after core vitrectomy using a sterilized contact lens electrode in 20 eyes that underwent non-complicated vitreous surgery. A light-emitted diode was embedded into the contact lens, and a stimulus of 150 ms on and 350 ms off at 2 Hz was delivered. The amplitudes and latencies of the a-, b-, and d-waves, photopic negative response (PhNR), and oscillatory potentials (OPs) were analyzed. The intraocular temperature at the mid-vitreous was measured at the beginning and just after the surgery with a thermoprobe.ResultsThe intraocular temperature was 33.2 ± 1.3°C before and 29.4 ± 1.7°C after the vitrectomy. The amplitudes of the PhNR and OPs were significantly smaller after surgery, and the latencies of all components were prolonged after the surgery. These changes were not significantly correlated with the changes of the temperature.ConclusionRetinal function is reduced just after core vitrectomy in conjunction with significant temperature reduction. The differences in the degree of alterations of each ERG component suggests different sensitivity of each type of retinal neuron.
Highlights
Vitreous temperature has been reported to fluctuate during vitreous surgery.[1,2,3] Landers et al1 measured the temperature of the retinal surface during vitreous surgery with a 23-gauge flexible wire thermoprobe in 7 cases
The amplitudes of the photopic negative response (PhNR) and oscillatory potentials (OPs) were significantly smaller after surgery, and the latencies of all components were prolonged after the surgery
Our measurements showed that the midvitreous temperature was significantly lower just after core vitrectomy which is in good accordance with previous reports
Summary
Vitreous temperature has been reported to fluctuate during vitreous surgery.[1,2,3] Landers et al measured the temperature of the retinal surface during vitreous surgery with a 23-gauge flexible wire thermoprobe in 7 cases. They found that the retinal surface temperature decreased during vitrectomy and recovered 5 minutes after the completion of the vitrectomy. They showed that the change depended on the temperature of the irrigating fluid.[5,6] a layer-by-layer analysis of the retinal function was not done and in situ measurements of the intraocular temperature was not made
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