Comparison of the accuracy of CT in the identification of diaphragmatic injury among trauma patients prior to abdominal exploration
| 256-slice CT (n=181) | 64-slice CT (n=887) | P values | |
| Overall | |||
| True positive | 13 (7.2) | 61 (6.9) | 0.88 |
| True negative | 148 (81.8) | 739 (83.3) | 0.61 |
| False positive | 10 (5.5) | 14 (1.6) | 0.001 |
| False negative | 10 (5.5) | 73 (8.2) | 0.22 |
| Blunt | |||
| True positive | 5 (4.8) | 28 (4.7) | 0.98 |
| True negative | 90 (86.5) | 537 (90.9) | 0.17 |
| False positive | 7 (6.7) | 8 (1.4) | 0.001 |
| False negative | 2 (1.9) | 18 (3.0) | 0.53 |
| Penetrating | |||
| True positive | 8 (10.4) | 33 (11.1) | 0.85 |
| True negative | 58 (75.3) | 202 (68.2) | 0.23 |
| False positive | 3 (3.9) | 6 (2.0) | 0.34 |
| False negative | 8 (10.4) | 55 (18.6) | 0.09 |
| Left-sided | |||
| True positive | 9 (5.3) | 35 (4.3) | 0.54 |
| True negative | 148 (86.6) | 739 (90.2) | 0.41 |
| False positive | 7 (4.1) | 5 (0.6) | 0.03 |
| False negative | 7 (4.1) | 40 (4.9) | 0.69 |
| Right-sided | |||
| True positive | 4 (2.5) | 25 (3.1) | 0.67 |
| True negative | 148 (93.7) | 739 (91.8) | 0.96 |
| False positive | 3 (1.9) | 9 (1.1) | 0.02 |
| False negative | 3 (1.9) | 32 (4.0) | 0.19 |
Data presented as number and proportion of patients with preoperative CT imaging.
Estimates from Pearson’s χ2 analysis.