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Table 2 Patient, surgical and TVI characteristics for each TVI expression pattern

From: The triple variable index combines information generated over time from common monitoring variables to identify patients expressing distinct patterns of intraoperative physiology

Variable Elevated TVI Mixed TVI Depressed TVI
Total Profiles 891 2931 1474
Total Patients 857 2554 1291
% Repeat surgery (95% CI) 3.8 (2.7–5.3) 12.9 (11.7–14.1) 12.4 (10.8–14.2)
% ASA Physical Status 1 (95% CI) 5.2 (3.8–6.9) 4.6 (3.9–5.5) 3.9 (3.0–5.1)
% ASA Physical Status 2 (95% CI) 36.8 (33.7–40.1) 29.6 (28.0–31.3) 22.7 (20.6–25.0)
% ASA Physical Status 3 (95% CI) 51.1 (47.8–54.5) 49.0 (47.2–50.9) 44.4 (41.9–47.0)
% ASA Physical Status 4 (95% CI) 6.7 (5.2–8.6) 16.1 (14.8–17.5) 27.3 (25.0–29.6)
% ASA Physical Status 5 (95% CI) 0.1 (0.0–0.7) 0.6 (0.3–0.9) 1.6 (1.1–2.5)
% Emergent Surgery (95% CI) 5.8 (4.4–7.6) 10.5 (9.5–11.7) 12.8 (11.2–14.7)
Mean Age (95% CI) 52.0 (50.9–53.1) 53.7 (53.1–54.4) 54.5 (53.6–55.3)
% Male Gender (95% CI) 56.9 (53.6–60.2) 53.4 (51.6–55.2) 52.7 (50.1–55.3)
Most common surgical specialty (%) 1. General (35)
2. Orthopedic (20)
3. Thoracic (11)
1. General (32)
2. Orthopedic (19)
3. Thoracic (10)
1. General (29)
2. Orthopedic (16)
3. Cardiac (16)
Most common primary procedure (%) 1. Irrigation and Debridement of Wound (5.5)
2. Exploratory Laparotomy (3.7)
3. Anterior Spine Cervical Discectomy and Internal Fusion/Fixation (3.6)
1. Irrigation and Debridement of Wound (11.9)
2. Exploratory Laparotomy (4.4)
3. Esophagus Dilatation (2.8)
1. Irrigation and Debridement of Wound (10.0)
2. Exploratory Laparotomy (7.4)
3. Aortic Valve Replacement/Repair (2.7)
Median Length of Procedure, hr. (95% CI) 2.5 (2.4–2.7) 1.4 (1.3–1.5) 2.0 (1.9–2.2)
Mean MAP, mmHg (95% CI) 86.5 (86.3–86.6) 82.3 (82.2–82.4) 76.6 (76.5–76.7)
Mean MAP, z-score (95% CI) 0.22 (0.22–0.23) −0.02 (−0.02-(−0.01)) −0.34 (− 0.35-(− 0.33))
Mean BIS (95% CI) 45.3 (45.2–45.4) 41.8 (41.7–41.8) 38.0 (37.9–38.1)
Mean BIS, z-score (95% CI) 0.38 (0.37–0.39) 0.04 (0.03–0.05) −0.31 (− 0.32-(− 0.31))
Mean MAC (95% CI) 0.980 (0.977–0.982) 0.817 (0.815–0.819) 0.666 (0.664–0.668)
Mean MAC, z-score (95% CI) 0.56 (0.55–0.56) − 0.01 (− 0.02-(− 0.01)) 0.54 (0.55-(− 0.53))
Mean TVI (95% CI) 1.21 (1.19–1.23) 0.01 (− 0.01–0.02) −1.25 (−1.27-(−1.24))
Median TVI values per profile (Q1-Q3) 12 (9–18) 7 (4–11) 10 (6–14)
  1. The three most common surgical specialties and procedures representing each pattern are displayed. CI Confidence Interval, Q1 1st quartile, Q3 3rd quartile, hr hour. Location: Line 357 in text