Table 1.
Characteristics of intensive care unit stays.
| Hospital 1a | Hospital 2a | ||||
|---|---|---|---|---|---|
| Stays w/sustained hypotensionb | Stays w/non-sustained hypotensionb | Stays w/o hypotensionb | All Stays | All Stays | |
| Demographics: | |||||
| ICU stays, n (%) | 102 (47) | 57 (27) | 56 (26) | 215 (100) | 62 (100) |
| Unique patientsc, n (%) | 90 (51) | 53 (30) | 54 (31) | 175 (100) | 62 (100) |
| Age, median (IQR) | 75 (64–83) | 74 (63–82) | 70 (59–78) | 74 (64–82) | 69 (61–78) |
| Female, proportion, % | 45 | 45 | 50 | 49 | 55 |
| Male, proportion, % | 52 | 51 | 50 | 49 | 45 |
| Undocumented gender, proportion, % | 3 | 4 | 0 | 2 | 0 |
| Indication for vasopressors (subjects may have more than one documented indication): | |||||
| Sepsis or possible sepsis, proportion, % | 47 | 42 | 46 | 48 | 45 |
| Cardiogenic or possible cardiogenic, proportion, % | 47 | 58 | 54 | 54 | 45 |
| Post-operative care, proportion, % | 14 | 13 | 22 | 18 | 68 |
| Other or unknown, proportion, % | 22 | 28 | 43 | 31 | 19 |
| Characteristics of vasopressor infusion: | |||||
| Total duration of vasopressor infusion, median per stay (IQR), hr | 21.3 (9.52–46.6) | 17.1 (6.0–37.6) | 5.9 (1.7–11.3) | 14.0 (4.5–34.9) | 37.6 (22.3–55.6) |
| Time between vasopressor dose changes, median per stay (IQR), min | 90 (55–143) | 90 (36.3–242.5) | 60 (25–90) | 75 (45–138) | 60 (28–110) |
aHospital 1 includes patient data from the MIMIC II database and Hospital 2 includes patient data from a separate medical center. bHypotension is defined as MAP < 60 mmHg and sustained episode of hypotension is defined as at least 15 continuous min of hypotension. cSome patients have multiple stays that are in different categories, therefore the number of unique patients for all stays is less than the sum of the first three columns.