Acknowledgments
We thank ICU nurses (Department of Critical Care, Peking University Third Hospital) and Yi Chen M.Sc. (Department of Pharmacy Administration and Clinical Pharmacy School of Pharmaceutical Sciences, Peking University) for the help of the arterial blood sampling. We thank Professor Yanping Deng Ph.D. (National Institution on Drug dependence, Peking University) for the help in calculating PK parameters. We thank Livzon Pharm for offering dantrolene (Revonto) for free, together with the method of sample preparation and storage.