Table 2:

MRI-derived measures and ICP scores

Idiopathic Normal Pressure Hydrocephalus
Total Population (n = 21) Median (Range)Shunt Group (n = 17) Median (Range)Conservative Group (n = 4) Median (Range)
MRI measures
    Aqueduct stroke volume (μL)
        Before shunt111 (26–417)109 (26–417)130 (36–163)
        After shunt68 (17–201)–
    Ventricular volume (ml)
        Before shunt138 (41–266)137 (41–266)143 (105–152)
        After shunt105 (34–230)–
    Aqueductal area (mm2)
        Before shunt14 (9–38)14 (9–38)13 (9–36)
        After shunt12 (9–58)–
ICP scores
    Mean ICP (mm Hg)
        Average6.1 (−1.8–11.9)6.1 (−1.8–11.9)5.8 (3.0–8.8)
        Percentage ≥15 mm Hg0 (0–2)0 (0–2)0 (0–0)
    Mean ICP wave amplitude (MWA, mm Hg)
        Average4.5 (3.1–7.9)4.7 (3.5–7.9)3.4 (3.1–5.2)
        Percentage ≥5 mm Hg26 (1–100)27 (2–100)3 (1–58)