Table 3

Phase shift (radians) between mean blood flow velocity and the other monitored variables

Low frequencyHigh frequency
Variables Subjects Supine Standing Supine Standing
MFV vRRControl2.59  (0.3)2.10  (0.4) 0.69  (0.7)0.63  (0.8)
VVS2.62 (0.3)2.30 (0.3) 0.68 (1.1)0.20 (1.1)
Diabetic2.39 (0.4)1.99 (0.4) 0.13 (1.1)0.56 (1.1)
MFVv SAPControl1.38 (0.3)1.13 (0.1) 0.38 (0.5)0.15 (0.3)
VVS1.36 (0.2)1.03 (0.3) 0.36 (0.3)0.14 (0.4)
Diabetic0.91 (0.1)3-150 1.07 (0.3)0.13 (0.4)0.11 (0.2)
MFV vDAPControl1.30 (0.3)0.95 (0.1) 0.12 (0.5)0.45 (0.8)
VVS1.17 (0.3)0.91 (0.2) −0.42 (0.9)−0.04 (1.5)
Diabetic0.85 (0.2) 0.81 (0.2)−0.11 (0.6)0.10 (0.8)
  • Values are mean (SD).

  • 3-150 p < 0.05, p < 0.01 v both control and VVS group; p < 0.5 v supine position.

  • DAP, diastolic arterial blood pressure; MFV, mean cerebral blood flow velocity; RR, RR interval; SAP, systolic arterial blood pressure; VVS, vasovagal syncope.