VON-WILLEBRAND-FACTOR, P-SELECTIN AND FIBRINOGEN LEVELS IN PATIENTS WITH ACUTE ISCHEMIC AND HEMORRHAGIC STROKE, AND THEIR RELATIONSHIP WITHSTROKE SUB-TYPE AND FUNCTIONAL OUTCOME

Although ischaemic stroke is associated with accentuated platelet func tion, it remains unclear whether this applies to all sub-types, especi ally lacunar infarcts, which differ from cortical infarction in their patho-aetiology. Similarly, conflicting evidence suggests that haemorr hagic stroke may, or may not, be associated with a hypothrombotic stat e. Levels of von Willebrand factor (VWF), fibrinogen, and P-selectin w ere measured within 48 h of ictus in 163 patients with acute ischaemic stroke and 40 patients with acute primary intracerebral haemorrhage, and 33 age, gender and race matched-controls. vWF (IU/dl) was signific antly increased in both cortical and lacunar ischaemic stroke, and hae morrhagic stroke, as compared with controls, median (semi-quartile ran ge): 158 (25) vs 144 (19) vs 147 (24) vs 114 (16), respectively. Simil arly, fibrinogen (g/litre) was increased: 4.80 (0.90) vs 4.65 (0.70) v s 4.35 (0.83) vs 3.70 (0.70). In contrast, soluble P-selectin (ng/ml) was increased in cortical stroke as compared with lacunar infraction p atients or controls: 408 (101) vs 300 (108) vs 324 (121), respectively ; P-selectin was not increased in haemorrhagic stroke, 360 (153). Both vWF and fibrinogen correlated with 3-month functional outcome (modifi ed Rankin score): r = 0.371 (2P = 0.0006), and r = 0.195 (2P = 0.042), respectively; however, P-selectin was not associated with outcome: r = 0.188 (2P = 0.084). The results suggest that increases in vWF and fi brinogen in all types of stroke reflect an acute phase response; in co ntrast, increased soluble P-selectin levels in cortical stroke, but no t lacunar infarction, suggest that platelets contribute to the patho-a etiology of some subtypes of ischaemic stroke.