Table 2. Patients’ Intracranial Pressure and Clinical Characteristicsa.
| Characteristic | SVP | P value | |
|---|---|---|---|
| Absent | Present | ||
| Patients, No. (%) | 14 (13) | 91 (87) | NA |
| Simultaneous ICP, mean (SD) [range], mm Hgb | 13 (14) [−12 to 36] | 1 (5) [−17 to 14] | <.001 |
| Simultaneous pulse amplitude, mean (SD)c | 10 (5) | 5 (2) | <.001 |
| 24-h ICP, mean (SD) [range], mm Hg | 16 (11) [−5 to 30] | 4 (5) [−11 to 24] | <.001 |
| 24-h Pulse amplitude, mean (SD), mm Hg | 9 (4) | 5 (2) | <.001 |
| Night ICP (supine), mean (SD) [range], mm Hg | 21 (8) [1 to 31] | 8 (5) [−5 to 25] | <.001 |
| MAP, mean (SD), mm Hg | 89 (13) | 92 (9) | .28 |
| IOP, mean (SD), mm Hg | 16 (3) | 15 (3) | .25 |
Abbreviations: ICP, intracranial pressure; IOP, intraocular pressure; MAP, mean arterial pressure; NA, not applicable; SVP, spontaneous venous pulsation.
a
1 mm Hg = 1.36 cm H2O.
b
Simultaneous ICP is the mean ICP (in mm Hg) over the same minute as the infrared video recording.
c
Simultaneous pulse amplitude is the mean ICP pulse amplitude (in mm Hg) over the same minute as the infrared video recording.