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Table 3 TCD parameters in patients with severe ICA stenosis and normal controls

From: Influence of collateral circulation on cerebral blood flow and frontal lobe cognitive function in patients with severe internal carotid artery stenosis

Parameters AcoA group PcoA group OA group Controls H P value
Vs (Affected side) 50.00 (44.50,56.00) 44.00 (36.25,52.25) 31.50 (27.25,41.25) 79.00 (74.00,85.00) 143.610 < 0.0001*
Vs (Unaffected side) 123.00 (102.00,136.50) 80.50 (68.25,96.00) 96.00 (69.00,107.25) 102.901 < 0.0001*
Vm (Affected side) 39.00 (35.00,43.50) 32.50 (28.25,38.00) 22.50 (20.25,30.50) 52.00 (46.00,57.00) 117.469 < 0.0001*
Vm (Unaffected side) 73.00 (63.00,86.50) 47.50 (42.25,61.50) 55.50 (41.25,67.25) 78.395 < 0.0001*
Vd (Affected side) 33.00 (28.00,37.00) 28.00 (23.25,31.75) 18.50 (17.00,25.50) 37.00 (32.75,40.00) 55.753 < 0.0001*
Vd (Unaffected side) 51.00 (42.00,64.50) 31.50 (28.00,43.75) 35.50 (28.50,44.50) 57.931 < 0.0001*
PI (Affected side) 0.45 (0.35,0.54) 0.55 (0.42,0.60) 0.53 (0.50,0.59) 0.85 (0.75,1.03) 131.688 < 0.0001*
PI (Unaffected side) 0.88 (0.74,1.11) 0.96 (0.85,1.13) 0.99 (0.87,1.15) 6.445 0.092
  1. Vs, stolic flow velocity; Vm, mean flow velocity; Vd, diastolic velocity; PI, pulsatility index; H and P value, by non-parametric Kruscal-Wallis tests within the four groups
  2. *P < 0.0001 indicate statistically significant differences