Saugel B, et al. - Among patients (n=370, aged 40 to 65 yr) with American Society of Anesthesiology physical status classification I or II, undergoing elective noncardiac surgery with general anesthesia, researchers focused on the link between ambulatory mean arterial pressure and preinduction, postinduction, and intraoperative mean arterial pressures. They found only a weak correlation between the first preinduction and mean daytime mean arterial pressure. Based on the findings, they concluded that preinduction mean arterial pressure cannot serve as an alternative for the normal daytime mean arterial pressure. Compared with the lowest nighttime mean arterial pressure, the lowest postinduction and intraoperative mean arterial pressures were lower in most patients. In 263 patients (71%), the lowest nighttime mean arterial pressure was higher than 65 mmHg.