twenty patients aged 55 +/- 16 years with 40 chronic ventricular tachycardias ( vt ) refractory to 4.6 +/- 1.9 antiarrhythmic drugs , used alone or in combination , were managed by low doses of beta-blocker agents combined with oral amiodarone ( am ) , either after loading ( 1.2 g for 7 days , n : 5 ) or reloading ( 1.2 g for 4 days , n : 15 ) of am .
C0003195
antiarrhythmic drugs
C0002598
am