Table 1.
Characteristics of patients at the time scans were performed.
| Matched Contrast Scans (n = 53) |
Matched Noncontrast Scans (n = 53) |
Unmatched Contrast Scans (n = 26) |
Unmatched Noncontrast Scans (n = 167) |
|
|---|---|---|---|---|
| Matching criteria | ||||
| mCrCl, mL/min/1.73 m2 | 66 ± 30 | 65 ± 29 | 97 ± 43 | 44 ± 33 |
| Ventilated at time of scan | 22 (42%) | 22 (42%) | 16 (62%) | 98 (59%) |
| Pressor use in 4 hrs before CT | 2 (4%) | 2 (4%) | 6 (23%) | 19 (11%) |
| Diabetes | 15 (28%) | 15 (28%) | 4 (15%) | 62 (37%) |
| Age, years | 70 ± 10 | 67 ± 13 | 61 ± 14 | 71 ± 12 |
| Liver disease | 17 (32%) | 13 (25%) | 5 (19%) | 31 (19%) |
| CHF (current or Class III/IV) | 5 (9%) | 9 (17%) | 3 (12%) | 25 (15%) |
| SCr, μmol/L | ||||
| Last value before scanning | 92 ± 30 | 95 ± 41 | 64 ± 30 | 133 ± 84 |
| Lowest in the preceding week | 82 ± 28 | 85 ± 40 | 56 ± 21 | 108 ± 65 |
| Highest in the preceding week | 137 ± 80 | 134 ± 65 | 80 ± 31 | 171 ± 114 |
| Last pre-scan BUN, mmol/L | 7.1 ± 3.6 | 8.2 ± 4.6 | 4.6 ± 2.5 | 11.4 ± 7.1 |
| Mean arterial pressure, mm Hg | ||||
| Before acute illness (baseline) | 93 ± 14 | 92 ± 14 | 95 ± 13 | 95 ± 15 |
| Lowest 24 hrs pre-scan | 67 ± 16 | 63 ± 16 | 70 ± 13 | 65 ± 15 |
| FIO2 at time of scan, % | 42 ± 23 | 39 ± 16 | 52 ± 30 | 46 ± 21 |
| New sepsis before scan | 8 (15%) | 8 (15%) | 8 (31%) | 22 (13%) |
| Body area scanned | ||||
| Head | 19 (36%) | 32 (60%) | 4 (15%) | 64 (38%) |
| Chest | 35 (66%) | 22 (42%) | 16 (62%) | 96 (58%) |
| Abdomen/pelvis | 27 (51%) | 10 (19%) | 15 (58%) | 44 (26%) |
| Contrast desirable | 4 (8%) | 17 (10%) |
BUN, blood urea nitrogen; mClCr, measured creatinine clearance; CT, computerized tomography; CHF, congestive heart failure; FIO2, fraction of inspired oxygen; SCr, serum creatinine.