Amplitude and temporal parameters of vascular blood flow and CSF (cervical and ventricular) flows in patients with AS and controls*
| AS | Control | P | |
|---|---|---|---|
| No. of patients | 17 | 20 | NS |
| Age (yr) | 39 | 44 | NS |
| Vascular flows | |||
| Arterial mean flow (mL/min) | 589 ± 115 | 607 ± 158 | NS |
| Venous mean flow (mL/min) | 379 ± 157 | 417 ± 158 | NS |
| Arteriovenous delay (% of CC) | 16 ± 12 | 19 ± 12 | NS |
| Arteriovenous stroke volume (mL) | 0.8 ± 0.2 | 0.8 ± 0.3 | NS |
| Cervical flows | |||
| C2–C3 peak flush flow (mL/min) | 157 ± 58 | 160 ± 54 | NS |
| C2–C3 peak flush latency (% of CC) | 6 ± 3 | 5 ± 4 | NS |
| C2–C3 stroke volume (μL/CC) | 499 ± 251 | 508 ± 166 | NS |
| 4th V flows | |||
| 4th V peak flush latency (% CC) | 4 ± 7 | 13 ± 8 | .05 |
| 4th V stroke volume (μL/CC) | 24 ± 18 | 24 ± 13 | NS |
| Aqueductal level | |||
| Stroke volume (μL/CC) | ∅ | 44 ± 25 |
Note:—NS indicates no significance;∅, absence of flow.
* Results are represented by mean ± SD values.