Hyperbaric Oxygen Treatment for Diabetic Retinopathy and Neuropathy in a Streptozotocin Induced Diabetic Rat Model

Aim: Diabetes Mellitus is a global public health challenge with major and potentially de-vastating complications, and concomitant complications include retinopathy and neuropathy due to hypoxia and microvascular dysfunction. In this study, we investigated the effect of hyperbaric oxygen therapy as a method to transiently improve tissue oxygenation on diabetic retinopathy and neuropathy in a streptozotocin induced type-1 diabetic rat model (Wistar). Methods: Streptozotocin induced type-1 diabetic rats received 10 sessions of 2-h hyperbaric oxygen exposures (pO 2 = 309 kPa) over 2 weeks. Animals were exposed to light stimuli to produce light evoked potentials to estimate the effect of oxygen treatment on diabetic retinopathy. Sciatic nerves were exposed and stimulated to produce muscle evoked potential, which were recorded in the muscles of the foot and subsequently used to evaluate the effect of oxygen treatment on diabetic neuropathy. Results: We found significantly shorter light evoked potential latency and increased amplitude in hyperbaric oxygen treated animals. No change was found in nerve conduction. Conclusions: This study showed that hyperbaric oxygen therapy is a potentially effective treatment for diabetic retinopathy, im-proving both latency and amplitude of light evoked potentials.