Table 1:

Blood flow parameters

Internal Jugular Vein FlowArterial Flow
Unrestricted FlowJugular CompressionUnrestricted FlowJugular Compression
Mean vessel area (cm2)
    Mean1.17 ± 0.540.70 ± 0.351.0 ± 0.770.97 ± 0.68
    Range0.40–2.180.29–1.41−0.99–1.53−0.76–1.56
    t testt = 3.56, P = .005at = 0.51, P = .604
Mean flow rate (mL/min) (caudal flow for venous flow, cranial for arterial)
    Mean572.2 ± 219.7460.8 ± 202.4814.7 ± 221.9815.3 ± 290.6
    Range153.8–862.2135–726.4268–989.2127.7–1070
    t testt = 2.85, P = .008a−0.01, P = .989
Flow-rate amplitude (mL/min)
    Mean974.1 ± 523.6382.6 ± 312.71803.8 ± 490.11720.6 ± 688.4
    Range198.5–1838.856.8–1069.0601.4–2290.2282.8–2721.4
    t testt = 3.75, P = .002at = 0.58, P = .558

  • ↵a P < .05, paired t test.