Table 10 Performance of various values of PetCO2 and duration of CPR for prediction of survival in patients with nonshockable initial rhythm in cardiac arrest
PetCO2 | Cut-off (kPa [mmHg]) | n | Min-max (kPa [mmHg]) | Mean ± SD (kPa [mmHg]) | Sensitivity (%) | Specificity (%) | PPV (%) | NPV (%) | AUROC (95% CI) |
|---|---|---|---|---|---|---|---|---|---|
initial | ≤1.3 (10) | 97 | 0.0–1.3 (0.0–10) | 0.66 ± 0.32 (5.1 ± 1.9) | 100 | 27 | 23 | 100 | 0.58 (0.52–0.63) |
>1.3 (10) | 336 | 1.4–8.4 (10.1–63.2) | 4.17 ± 2.12 (30.9 ± 15.8) | ||||||
0–10 min | ≤1.7 (12.8) | 229 | 0.4–1.7 (3.5–12.8) | 0.99 ± 0.36 (7.1 ± 3.3) | 100 | 64 | 37 | 100 | 0.88 (0.84–0.91) |
>1.7 (12.8) | 204 | 1.8–5.6 (12.9–42.1) | 2.79 ± 0.86 (21.5 ± 6.2) | ||||||
10 min | ≤1.6 (12.1) | 199 | 0.3–1.6 (2.2–12.1) | 1.03 ± 0.38 (7.6 ± 3.1) | 100 | 56 | 32 | 100 | 0.87 (0.83–0.91) |
>1.6 (12.1) | 234 | 1.7–7.2 (12.2–54.2) | 3.02 ± 1.08 (22.6 ± 6.5) | ||||||
11–15 min | ≤1.7 (12.8) | 239 | 0.4–1.7 (3.4–12.8) | 0.99 ± 0.31 (7.3 ± 2.8) | 100 | 67 | 39 | 100 | 0.86 (0.83–0.90) |
>1.7 (12.8) | 194 | 1.4–5.1 (12.9–38.4) | 3.14 ± 0.81 (23.3 ± 6.7) | ||||||
15 min | ≤1.9 (14.3) | 241 | 0.3–1.9 (2.4–14.3) | 1.12 ± 0.41 (7.9 ± 3.8) | 100 | 67 | 39 | 100 | 0.87 (0.84–0.91) |
>1.9 (14.3) | 192 | 2.1–6.1 (14.4–45.9) | 3.62 ± 0.94 (28.6 ± 7.5) | ||||||
20 min | ≤2.1 (15.8) | 242 | 0.3–2.1 (2.3–15.8) | 0.91 ± 0.31 (7.2 ± 2.2) | 100 | 68 | 40 | 100 | 0.87 (0.84.0.91) |
>2.1 (15.8) | 190 | 2.3–7.8 (15.9–58.7) | 4.39–1.11 (33.1 ± 7.7) | ||||||
max | ≤2.8 (21.1) | 231 | 0.8–2.8 (6.1–21.1) | 1.68 ± 0.44 (13.4 ± 3.5) | 100 | 65 | 38 | 100 | 0.89 (0.86–0.92) |
>2.8 (21.1) | 202 | 2.9–10.7 (21–80.5) | 5.26 ± 1.48 (39.1 ± 12.2) | ||||||
Final | ≤1.6 (12.1) | 240 | 0.2–1.6 (1.9–12.1) | 0.97 ± 0.33 (6.9 ± 2.7) | 100 | 67 | 39 | 100 | 0.87 (0.84–0.91) |
>1.6 (12.1) | 193 | 1.9–6.6 (12.2–49.6) | 3.06 ± 0.97 (27.1 ± 7.2) |