Melior Discovery pulmonary
Respiratory Depression Assay
Respiratory depression is a significant side effect associated with opioid treatment of acute and chronic pain. Efforts to generate analgesics that dissociate pain relief from negative side effects are critical. This study examines the effects of morphine in a respiratory depression assay using pulse oximetry. Blood oxygen saturation levels were assessed in conscious rats. Prior to dosing a 30 minute baseline was established for each animal. After dosing, a 5-second average of the oxygen saturation value was sampled every 5 minutes for 60 minutes.

A significant reduction in O2 saturation was found in rats treated with morphine compared to rats treated with vehicle. Data are mean ± SEM; **p<0.01 compared to vehicle.
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