N?u ?ang có nguy c? cao, bác s? có th? s? kê cho ng??i b?nh m?t lo?i thu?c ?? c? g?ng b?o v? ch?c n?ng th?n.If coronary heart block occurs, the patient should be intently monitored and isoproterenol infusion or transvenous cardiac pacemaker insertion need to take place. To the administration of overdose-similar bronchospasm, administer bronchod