Comparison of characteristics between patients with and without the metallic hyperdensity sign
| Characteristics | Presence of Metallic Hyperdensity Sign (n = 59) | Absence of Metallic Hyperdensity Sign (n = 139) | P Value |
|---|---|---|---|
| Age (mean) (yr) | 70.5 ± 10.5 | 69.4 ± 12.2 | .568 |
| Female (No.) (%) | 26 (44.1) | 56 (40.3) | .639 |
| Comorbid conditions | |||
| Hypertension (No.) (%) | 37 (62.7) | 84 (60.4) | .874 |
| Diabetes mellitus (No.) (%) | 14 (23.7) | 24 (17.3) | .326 |
| Atrial fibrillation (No.) (%) | 35 (59.3) | 50 (35.9) | .003 |
| Clinical variables | |||
| Baseline NIHSS (median) (IQR) | 15 (12–18) | 14 (10–17) | .116 |
| Onset-to-puncture time (median) (IQR) (min) | 334 (237–425) | 306 (213–415) | .289 |
| Retrieval attempts (median) (IQR) | 2 (1–3) | 1 (1–3) | .039 |
| Radiologic data | |||
| Baseline infarct volume (median) (IQR) (mL) | 59.9 (34.7–80.9) | 46.3 (27.5–80.0) | .096 |
| Baseline hypoperfusion volume (median) (IQR) (mL) | 108.9 (79.2–153.6) | 107.1 (68.0–160.0) | .639 |
| Recanalization (No.) (%) | 48 (81.4) | 123 (88.4) | .181 |
| 24-Hour hemorrhagic transformation (No.) (%) | 58 (98.3) | 54 (38.8) | <.001 |
| 24-Hour parenchymal hemorrhage (No.) (%) | 45 (76.3) | 6 (4.3) | <.001 |
Note:—IQR indicates interquartile range.