Observation after Naloxone (Hour) (image) Society for Academic Emergency Medicine Share Print E-Mail Caption Urban prospective observational cohort, 538 patients. Credit KIRSTY CHALLEN, B.SC., MBCHB, MRES, PH.D., LANCASHIRE TEACHING HOSPITALS, UNITED KINGDOM. Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.