Figure 1 Distribution of mean arterial blood pressure values (MAP) obtained from invasive pressure in the facial artery (FA) and from oscillometric blood pressure on the tail base with a goal cuff width-to-tail circumference ratio of 0.25 (NIBP) when MAP from the FA measured less than 70 mmHg. The NIBP numbers above the 70 mmHg delineation for clinical intervention (dashed line) represent 12% of instances (24/194) where NIBP overestimated the MAP from the FA. These NIBP overestimations compared to FA MAP ranged between 2 and 18 mmHg (mean ± SD, 11±5 mmHg).