Effects of autoantibodies against β1-adrenoceptor in hepatitis virus myocarditis on action potential and L-type Ca2+ currents

Figure 2 AP recordings before and after superfusion with anti-β₁-receptor diluted at 1:80 in the absence and presence of 1 μmol/L metoprolol. A: effect of anti-β₁-receptor diluted an 1:80 on AP. ^arepresents AP before superfusion with 1:80 anti-β₁-receptor autoantibodies, ^brepresents AP after superfusion with 1:80 anti-β₁-receptor autoantibodies. B: no marked changes of AP after superfusion with 1:80 anti-β₁-receptor autoantibod-ies in the presence of 1 μmol/L metoprolol.