Figure 2. Histograms depicting the slope (Mw; top panel) and length intercept (Lw; middle panel) of the regional preload recruitable stroke work relation and the time constant of isovolumic relaxation (tau; bottom panel) in the conscious state before (C; open bar) and after pacing (P) and during 1.1, 1.4, and 1.7 MAC (end-tidal concentration) isoflurane (hatched bars) and halothane (solid bars).aSignificantly (P < 0.05) different from P;bSignificantly (P <0.05) different from 1.1 MAC;cSignificantly (P < 0.05) different from corresponding isoflurane value.