Intramuscular bupivacaine injection dose-dependently increases glutamate release and muscle injury in rats Cherng, C.-H.; Wong, C.-S.; Wu, C.-T.; Yeh, C.-C. Acta Anaesthesiologica Taiwanica: Official Journal of the Taiwan Society of Anesthesiologists 48(1): 8-14 2010 https://eurekamag.com/research/053/943/053943547.php