Fig. 7.

Stability of myoglobin oxygenation and cytochrome a₆₅₀ redox state in left ventricular working hearts perfused with Krebs-Henseleit (KH) or perfluorocarbon (PFC). Data are shown with the fitted change in spectral density (ΔOD^*) range measured during deoxygenation (Fig. 3, A and B), illustrating that any changes over 1 h were small. KH was normalized to its own baseline; PFC was normalized to the average change shown in Fig. 1A. Data reported as means ± SE; n = 4–5.