Feature | Before guidelines | After guidelines | ||||||
Case numbers | Cases | % | 5%–95% CI | Case numbers | Cases | % | 5%–95% CI | |
Entire population | ||||||||
Any abnormality | 15 639 | 2248 | 14.4 | 13.8 to 14.9 | 17 033 | 2037 | 12.0 | 11.5 to 12.5 |
Acidosis | 1164 | 7.4 | 7.0 to 7.9 | 813 | 4.8* | 4.5 to 5.1 | ||
Hyponatraemia | 155 | 1.0 | 1.0 to 1.3 | 185 | 1.1 | 0.9 to 1.3 | ||
Hypernatraemia | 146 | 0.9 | 0.9 to 1.3 | 112 | 0.7 | 0.7 to 1.0 | ||
Hypokalaemia | 537 | 3.4 | 3.6 to 4.3 | 542 | 3.2 | 3.6 to 4.3 | ||
Hyperkalaemia | 246 | 1.6 | 1.6 to 2.1 | 385 | 2.3* | 2.6 to 3.2 | ||
Mortality | 13 592 | 1311 | 9.6 | 9.2 to 10.0 | 13 144 | 1261 | 9.6 | 9.1 to 10.1 |
Length of stay (mean) | 7.7 | 9.2 | ||||||
AKI | 10 541 | 12 862 | ||||||
Stage 1 | 707 | 6.7 | 6.2 to 7.2 | 1160 | 9.0* | 8.5 to 9.5 | ||
Stage 2 | 151 | 1.4 | 1.2 to 1.7 | 308 | 2.4* | 2.1 to 2.7 | ||
Stage 3 | 151 | 1.4 | 1.2 to 1.7 | 256 | 2.0 | 1.8 to 2.3 | ||
Emergency patients (medical, general and orthopaedic surgery) | ||||||||
Any abnormality | 10 701 | 1867 | 17.4 | 16.7 to 18.2 | 12 757 | 1690 | 13.2 | 12.7 to 13.8 |
Acidosis | 923 | 8.6 | 8.1 to 9.2 | 653 | 5.1 | 4.8 to 5.5 | ||
Hyponatraemia | 126 | 1.2 | 1 to 1.4 | 132 | 1.0 | 0.8 to 1.2 | ||
Hypernatraemia | 143 | 1.3 | 1.1 to 1.6 | 110 | 0.9 | 0.7 to 1.0 | ||
Hypokalaemia | 487 | 4.6 | 4.2 to 5.0 | 510 | 4.0 | 3.7 to 4.4 | ||
Hyperkalaemia | 188 | 1.8 | 1.5 to 2.0 | 285 | 2.2 | 2.0 to 2.5 | ||
Mortality | 8654 | 1288 | 14.9 | 14.1 to 15.6 | 8868 | 1234 | 13.9 | 13.2 to 14.7 |
Length of stay (mean) | 8.9 | 7.8 | ||||||
AKI | 6873 | 8868 | ||||||
Stage 1 | 514 | 7.5 | 6.9 to 8.1 | 807 | 9.1 | 8.5 to 9.7 | ||
Stage 2 | 116 | 1.7 | 1.4 to 2.0 | 209 | 2.4 | 2.1 to 2.7 | ||
Stage 3 | 146 | 2.1 | 1.8 to 2.5 | 223 | 2.5 | 2.2 to 2.9 | ||
Elective patients (general and orthopaedic surgery) | ||||||||
Any abnormality | 4938 | 381 | 7.7 | 7.0 to 8.5 | 4276 | 347 | 8.1 | 7.3 to 9.0 |
Acidosis | 241 | 4.9 | 4.3 to 5.5 | 160 | 3.7 | 3.2 to 4.4 | ||
Hyponatraemia | 29 | 0.1 | 0 to 0.1 | 53 | 1.2 | 0.9 to 1.6 | ||
Hypernatraemia | 3 | 0.0 | 2 | 0.0 | 0 to 0.2 | |||
Hypokalaemia | 50 | 1.0 | 0.8 to 1.3 | 32 | 0.7 | 0.5 to 1.1 | ||
Hyperkalaemia | 58 | 1.2 | 1.0 to 1.5 | 100 | 2.3 | 1.9 to 2.8 | ||
Mortality | 4938 | 23 | 0.5 | 0.3 to 0.7 | 4276 | 27 | 0.6 | 0.4 to 0.9 |
Length of stay (mean) | 4.3 | 4.4 | ||||||
AKI | 3668 | 3994 | ||||||
Stage 1 | 193 | 5.3 | 4.6 to 6.0 | 353 | 4.0 | 3.6 to 4.4 | ||
Stage 2 | 35 | 0.9 | 0.6 to 1.3 | 99 | 1.1 | 0.9 to 1.4 | ||
Stage 3 | 5 | 0.1 | 0 to 0.3 | 33 | 0.4 | 0.3 to 0.5 |
*For the entire population, significant change, p<0.0002. Statistical analysis of differences in the subgroups was not carried out.
AKI, acute kidney injury.