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“We found that procainamide reduced intracellular calcium to steady-state levels in hearts in which left ventricular function completely recovered (developed pressure > 67% of the steady-state value).”
“Both the transient and the sustained hyperpolarization evoked in smooth muscle cells in the presence of procainamide (15 min) or quinidine in calcium-containing or in calcium-free solution, respectively, were inhibited.”
Journal of cardiovascular pharmacology • 1979 | View Paper
“Quinidine, but not procaine amide or lidocaine, decreased calcium uptake by both mitochondrial and microsomal fractions at different concentrations of calcium.”