Fig. 3. Effects of methylmethacrylate monomer (MMA) on myocardial force development in 26 mm K⁺Tyrode solutions with 0.1 μm isoproterenol (n = 6). Average peak force (A ), maximum rate of early force development (dF^E/dt-max) (B ), and late force development (dF^L/dt-max) (C ) as a function of stimulation rate. Differences from *baseline (P < 0.05).