Table 2.
Patients | Condition | Qc Comparison | No. of Data Points | Qc, Mean (SD) | r | TE | CV |
---|---|---|---|---|---|---|---|
Healthy, supine | |||||||
Rest | Fick vs N2O | 52 |
Fick 6.4 (1.6) N2O 6.6 (1.0) |
0.82 (0.71–0.89) | 0.94 (0.79–1.17) | 16.5 (13.9–20.9) | |
Rest | Fick vs C2H2 | 51 |
Fick 6.3 (1.6) Rebreathing 7.2 (1.0) |
0.85 (0.76–0.91) | 0.84 (0.70–1.05) | 14.5% (12.0–18.3) | |
Rest | Thermodilution vs N2O | 56 |
Thermodilution 7.2 (1.2) N2O 6.6 (1.0) |
0.65 (0.46–0.78) | 0.90 (0.76–1.11) | 14.1 (11.8–17.7) | |
Rest, all loading conditions | Thermodilution vs C2H2 | 2793 |
Thermodilution 5.5 (1.9) Rebreathing 5.7 (2.0) |
0.84 (0.83–0.85) | 1.02 (1.00–1.05) | 19.5% (18.9–20.0) | |
Healthy, upright | |||||||
Rest | Fick vs N2O | 54 |
Fick 4.5 (0.9) N2O 4.1 (1.0) |
0.44 (0.19–0.63) | 0.82 (0.69–1.01) | 19.8 (16.3–25.0) | |
Exercise | Fick vs N2O | 57 |
Fick 16.9 (3.9) N2O 11.8 (2.4) |
0.84 (0.74–0.90) | 2.18 (1.84–2.68) | 13.9 (11.6–17.3) | |
Rest | Fick vs C2H2 | 117 |
Fick 5.3 (1.5) Rebreathing 5.6 (1.5) |
0.77 (0.69–0.84) | 0.94 (0.83–1.08) | 20.2% (17.7–23.5) | |
Exercise | Fick vs C2H2 | 114 |
Fick 15.4 (4.8) Rebreathing 13.5 (3.7) |
0.87 (0.81–0.91) | 2.39 (2.12–2.75) | 16.5% (14.5–19.2) | |
Rest | Thermodilution vs N2O | 54 |
Thermodilution 4.8 (0.9) N2O 4.1 (1.0) |
0.73 (0.57–0.83) | 0.64 (0.54–0.80) | 14.5 (12.0–18.2) | |
Exercise | Thermodilution vs N2O | 62 | Thermodilution 15.8 (3.9) N2O 12.1 (2.3) | 0.82 (0.72–0.89) | 2.21 (1.88–2.69) | 15.0 (12.6–18.6) | |
Exercise | Thermodilution vs C2H2 | 98 |
Thermodilution 15.0 (4.1) Rebreathing 13.3 (3.2) |
0.82 (0.75–0.88) | 2.36 (2.06–2.74) | 16.5% (14.3–19.4) | |
Healthy, supine/upright rest and upright exercise | N2O vs C2H2 | 172 |
N2O 7.9 (3.8) Rebreathing 8.9 (4.2) |
0.99 (0.98–0.99) | 0.58 (0.52–0.65) | 89 (8.1–10.1) |
C2H2 indicates acetylene; CV, coefficient of variation; N2O, nitrous oxide; Qc, cardiac output; r, Pearson correlation coefficient; and TE, typical error.