Fig. 2From: Postoperative delirium does not affect cardiopulmonary exercise testing in aged patients undergoing cardiac valve surgeryAnaerobic threshold oxygen uptake (AT-VO2) (A) and the slope of the relationship between carbon dioxide output (VCO2) and minute ventilation (VE) (B) in the presence and absence of delirium. Data are expressed as mean ± SD, and the number of observations is shown in parenthesesBack to article page