Table 1

Participant characteristics and intraoperative data

VariablesParticipants n=70
Demographics
 Age, years65 (33; 85)
 Sex, female41 (59%)
 BMI, kg/m228.8 (24.4; 32.9)
ASA
 I1 (1%)
 II37 (53%)
 III31 (44%)
 IV1 (1%)
Smoking
 Never37 (53%)
 Current3 (4%)
 Former30 (43%)
Medical history
 Stroke5 (7%)
 TCI3 (4%)
 Hypertension36 (51%)
 Diabetes mellitus8 (11%)
 Chronic lung disease*15 (21%)
 Sleep apnoea16 (23%)
 Arrhythmia11 (16%)
 Valvular disease6 (9%)
 Coronary artery disease8 (11%)
 Creatinine elevation2 (3%)
RCRI class
 I49 (70%)
 II15 (21%)
 III6 (9%)
 IV0
Surgical information
 Length of surgery, minutes264 (201; 405)
 Osteotomy performed35 (50%)
 Estimated blood loss, mL753 (400; 1400)
 Mean arterial pressure, mmHg83±9
 Heart rate, bpm69±11
Tissue oximetry
 SmO2 median, %75 (70; 79)
 SmO2 minimum, %66 (61; 70)
 SmO2 maximum, %84 (78; 88)
 TW AUC for SmO2, %×min/hour98 (9; 298)
 ScO2 median, %66 (62; 71)
 ScO2 minimum, %60 (56; 65)
 ScO2 maximum, %77 (72;82)
 TW AUC for ScO2, %*min*h-133 (0.06;131)
  • Data are mean±SD for normally distributed variables and median (IQR) for variables with skewed distributions.

  • *Includes asthma and chronic obstructive pulmonary disease.

  • ASA, American society of Anesthesiologists; BMI, body mass index; RCRI, Revised Cardiac Risk Index; ScO2, cerebral tissue oxygenation; SmO2, skeletal muscle tissue oxygenation; TCI, transient cerebral ischaemia; TW AUC, time-weighted area under the curve.