Time to adminis- tration of epinephrine and outcome after in-hospital cardiac arrest with non-shockable rhythms: retrospective analysis of large in-hos- pital data registry. BMJ. 2014;348:g3028. S6-21. Gueugniaud PY, Mols P, Goldstein P, et al. A comparison of repeated high doses and repeated standard doses of epinephrine for cardiac arrest outside the hospital. European Epinephrine Study Group. N Engl J Med. 1998;339:1595 601. S6-22. Hagihara A, Hasegawa M, Abe T, et al. Prehospital epinephrine use and survival among patients with out-of-hospital cardiac arrest. JAMA. 2012;307:1161 8. S6-23. Jacobs IG, Finn JC, Jelinek GA, et al. Effect of adrenaline on sur- vival in out-of-hospital cardiac arrest: a randomised double-blind placebo-controlled trial. Resuscitation. 2011;82:1138 43. S6-24. Koscik C, Pinawin A, McGovern H, et al. Rapid epinephrine admin- istration improves early outcomes in out-of-hospital cardiac arrest. Resuscitation. 2013;84:915 20. S6-25. Ho DS, Zecchin RP, Richards DA, et al. Double-blind trial of ligno- caine versus sotalol for acute termination of spontaneous sustained ventricular tachycardia. Lancet. 1994;344:18 23. S6-26. Somberg JC, Bailin SJ, Haffajee CI, et al. Intravenous lidocaine ver- sus intravenous amiodarone (in a new aqueous formulation) for incessant ventricular tachycardia. Am J Cardiol. 2002;90:853 9. S6-27. Hassan TB, Jagger C, Barnett DB. A randomised trial to investigate the efficacy of magnesium sulphate for refractory ventricular fibril- lation. Emerg Med J. 2002;19:57 62. S6-28. Thel MC, Armstrong AL, McNulty SE, et al. Randomised trial of magnesium in in-hospital cardiac arrest. Duke Internal Medicine Housestaff. Lancet. 1997;350:1272 6. S6-29. Elizari MV, Martinez JM, Belziti C, et al. Morbidity and mortality following early administration of amiodarone in acute myocardial infarction. GEMICA study investigators, GEMA Group, Buenos Aires, Argentina. Grupo de Estudios Multicentricos en Argentina. Eur Heart J. 2000;21:198 205. S6-30. Belhassen B, Horowitz LN. Use of intravenous verapamil for ven- tricular tachycardia. Am J Cardiol. 1984;54:1131 3. 