Fig. 1. Original tracing showing effect of selective exposure of the left anterior descending coronary artery (LAD) to blood equilibrated with 2.0 minimum alveolar concentration (MAC) desflurane. (A ) Perfusion of the LAD was switched to the desflurane-equilibrated blood reservoir. (B ) Perfusion was returned to the desflurane-free reservoir. Desflurane caused a marked increase in coronary blood flow and converted segmental shortening to segmental lengthening. These effects were reversible.