Table 4 Scanning practices identifying BCVI, COW anomalies, and strokes
Index BCVI Diagnosis n = 561 % (n) | Scan Identifying COW Anomalies BCVI Diagnosis n = 93 % (95 % CI) | Index Scan with COW Normal n = 468 % (95% CI) | p | |
|---|---|---|---|---|
Scan Type | ||||
Computed Tomography Angiography | 95.7% (537) | 96.8% (94.0-99.8) | 96.5% (96.3–99.0) | 0.38 |
Computed Tomography | 2.5% (14) | 1.1% (0.6–7.5) | 2.6% (1.5–4.4) | |
Magnetic Resonance Imaging | 1.6% (9) | 1.1% (0.2–5.8) | 1.7% (0.9–3.3) | |
Magnetic Resonance Angiography | 0.2% (1) | 0% (0-3.2) | 0.2% (0.2–43.5) | |
Four Vessel Cerebral Angiography | 0% (0) | 1.1% (0.6–7.8) | 0% (0-0.6) | |
Digital Subtraction Angiography | 0% (0) | 0% (0-3.2) | 0% (0-0.6) | |
Ultrasound | 0% (0) | 0% (0-3.2) | 0% (0-0.6) | |
Contrast Used | 97.7% (548) | 97.9% (94.2–99.8) | 97.4% (95.6–98.5) | > 0.99 |
CT-Slice, for CTs/CTAs1 | ||||
16 | 3.6% (20) | 4.6% (1.8–11.1) | 3.6% (2.2–5.7) | 0.002 |
32 | 1.3% (7) | 4.6% (1.8–11.1) | 0.7% (0.2–1.9) | |
64 | 71.6% (395) | 81.6% (72.5–88.5) | 71.8% (67.5–75.7) | |
128 | 20.5% (113) | 9.2% (4.7–16.9) | 23.3% (19.7–27.5) | |
512 | 0.5% (3) | 0% (0-3.2) | 0.7% (0.2–1.9) | |
Region Scanned | ||||
Head and Neck only | 20.4% (115) | 52.9% (39.2–62.2) | 29.3% (24.2–35.0) | 0.001 |
Head only | 1.1% (6) | 0% (0-3.2) | 2.2% (1.0-4.7) | |
Neck only | 39.4% (221) | 47.1% (37.8–60.8) | 68.5% (62.8–73.7) | |
During Whole-Body Scan | 38.8% (218) | 24.7% (18.0-35.5) | 41.5% (37.2–46.1) | 0.002 |
Head and Neck Included2 | 12.8% (72) | 39.1% (21.2–57.3) | 32.5% (26.3–39.4) | 0.01 |
Head included2 | 0.4% (2) | 8.7% (2.3–25.9) | 0% (0-0.6) | |
Neck included2 | 26.0% (144) | 52.2% (35.1–72.1) | 67.5% (60.7–73.7) |