Figure 2. Histograms illustrating (A) the effects of isoflurane (ISO) and xenon on the time constant of isovolumic relaxation ([small tau, Greek]), (B) the peak rate of increase of segment lengthening (dL/dtmax), and (C) the regional chamber stiffness constant (K) in normal (hatched bars) and cardiomyopathic dogs (solid bars) receiving 1.5 minimum alveolar concentration isoflurane in the presence and absence of 30%, 50%, and 65% xenon. *P < 0.05 versus conscious (CON);[dagger] P < 0.05 versus ISO alone;[double dagger] P < 0.05 versus ISO and 30% xenon;[section sign] P < 0.05 versus ISO and 50% xenon;[paragraph mark] P < 0.05 versus corresponding value in healthy dogs.