Figure 4. Plasma hexafluoroisopropanol (HFIP; right-side-up triangles) and net fluoride (upside-down triangles) concentrations (mean plus/minus SE). Sevoflurane was administered from 0-3 h, unless the surgical procedure ended before 3 h. Ten patients were studied, although the number of patients after 48 h was attenuated because of hospital discharge.