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Role of endogenous opioids in syncope induced by head-up tilt test and its relationship with isoproterenol-dependent and isoproterenol-independent neurally-mediated syncope.
Pérez-Paredes M, Picó-Aracil F, Fuentes-Jiménez T, Sánchez-Villanueva JG, Expósito-Ordoñez E, Gonzálvez-Ortega M, González-Caballero E, Nicolás-Garcia F, Nuño de la Rosa JA, Ruiz-Ros JA, Ruipérez-Abizanda JA. Pérez-Paredes M, et al. Int J Cardiol. 1998 Dec 31;67(3):211-8. doi: 10.1016/s0167-5273(98)00220-4. Int J Cardiol. 1998. PMID: 9894701 Clinical Trial.