TABLE 1.
Characteristics of Patients and Data in Amsterdam University Medical Centers Database (AmsterdamUMCdb)
| Characteristics | Total | ICU | Medium Care Unit (High-Dependency Unit) |
|---|---|---|---|
| Distinct patients, n | 20,109 | 16,518 | 4,295 |
| ICU admissions, n | 23,106 | 18,386 | 4,720 |
| ICU length of stay, d, median (IQR) | 1.08 (0.83–3.67) | 1.25 (0.92–4.71) | 0.83 (0.71–1.62) |
| Gender | |||
| Male, n (%) | 12,799 (63.65) | 10,565 (63.96) | 2,234 (52.01) |
| Age, yr, n (%) | |||
| 18–39 | 2,202 (10.95) | 1,538 (9.31) | 743 (17.30) |
| 40–49 | 1,897 (9.43) | 1,356 (8.21) | 613 (14.27) |
| 50–59 | 3,405 (16.93) | 2,740 (16.59) | 800 (18.63) |
| 60–69 | 5,272 (26.22) | 4,518 (27.35) | 954 (22.21) |
| 70–79 | 5,293 (26.32) | 4,635 (28.06) | 824 (19.19) |
| 80+ | 2,040 (10.14) | 1,731 (10.48) | 361 (8.41) |
| Admission year, n (%) | |||
| 2003–2009 | 8,556 (42.55) | 7,940 (48.07) | 809 (18.84) |
| 2010–2016 | 11,553 (57.45) | 8,578 (51.93) | 3,486 (81.16) |
| Admission type, n (%) | |||
| Surgical admissions | 11,294 (48.88) | 8,942 (48.63) | 2,352 (49.83) |
| Urgent admissions | 6,246 (27.03) | 4,985 (27.11) | 1,261 (26.72) |
| Reason for admission, n (%) | |||
| Cardiothoracic surgery | 5,935 (25.69) | 5,759 (31.32) | 176 (3.73) |
| Sepsis | 3,136 (13.57) | 2,751 (14.96) | 385 (8.16) |
| Respiratory failure | 1,568 (6.79) | 1,402 (7.63) | 166 (3.52) |
| Neurosurgery | 1,619 (7.01) | 739 (4.02) | 880 (18.64) |
| Trauma | 902 (3.90) | 613 (3.33) | 289 (6.12) |
| Gastrointestinal surgery | 1,149 (4.97) | 800 (4.35) | 349 (7.39) |
| Vascular surgery | 1,037 (4.49) | 791 (4.30) | 246 (5.21) |
| Cardiac arrest | 959 (4.15) | 958 (5.21) | 1 (0.02) |
| Neurologic disorders (nontraumatic) | 628 (2.72) | 475 (2.58) | 153 (3.24) |
| Cardiac disorders (including cardiogenic shock) | 538 (2.33) | 485 (2.64) | 53 (1.12) |
| Supportive therapies, n (%) | |||
| Vasopressors and/or inotropes | 13,575 (58.75) | 12,809 (69.67) | 766 (16.23) |
| Mechanical ventilation | 16,680 (72.19) | 16,305 (88.68) | 375 (7.94)a |
| Renal replacement therapy | 1,140 (4.93) | 1,136 (6.18) | 4 (0.08) |
| Outcome, n (%) | |||
| Death at unit discharge | 2,288 (9.90) | 2,216 (12.05) | 72 (1.53) |
| Death < 1 yr after discharge | 4,730 (20.47) | 4,002 (21.77) | 728 (15.42) |
| Severity scores | |||
| Urgent patients | |||
| APACHE II score, median (IQR) | 19 (13–26) | 21 (16–27) | 12 (8–16) |
| SOFA score (day 1), median (IQR) | 7 (4–10) | 8 (5–10) | 2 (1–4) |
| Elective patients | |||
| APACHE II score, median (IQR) | 16 (12–20) | 17 (14–21) | 11 (8–15) |
| SOFA score (day 1), median (IQR) | 6 (4–8) | 6 (4–8) | 2 (1–4) |
APACHE = Acute Physiology And Chronic Health Evaluation, IQR = interquartile range, SOFA = Sequential Organ Failure Assessment.
aNoninvasive ventilation.
For conciseness, only major categories of reason for admission are shown. Reasons for admission documented without diagnostic codes (i.e., full text only) were excluded from the analysis. APACHE II score ranges from 0 to 71; higher ranges indicate greater severity of illness. SOFA score ranges from 0 to 24; higher ranges indicate greater severity of illness.