Calcium entry during the plateau is essential for contraction; blockers of L-type Ca 2+ channels (e.g. verapamil) reduce force of contraction.
Children who are allergic to beta-blockers may be given a calcium blocker such as verapamil.
Calcium channel blockers: Nimodipine (Nimotop, Admon) and verapamil (Calan, Covera, Isoptin), typically used to treat angina and hypotension, have been found effective in a few small studies, for treating rapid cyclers.
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