Fig. 2. Pre- and intraoperative mean arterial pressure (MAP) measures for normotensive and hypertensive patients. ( A ) Mean absolute MAP measures. ( B ) Mean MAP measures as a fraction of preoperative MAP. Hypertensive patients had a significantly lower absolute minimum, higher absolute maximum ( A ) and lower fractional minimum ( B ) intraoperative MAP than normotensive patients. (*denotes statistically significant difference between normo- and hypertensive patients by Mann–Whitney U test. Error bars = SE. Ave. = average, intraop = intraoperative.)