TY - JOUR
T1 - Whole-blood platelet aggregation predicts in vitro and in vivo primary hemostatic function in the elderly
AU - Emery, Jonathan D.
AU - Leifer, David W.
AU - Moura, Glaci L.
AU - Southern, Patricia
AU - Morrissey, James H.
AU - Lawrence, Jeffry B.
PY - 1995/6
Y1 - 1995/6
N2 - Increased platelet aggregation is associated with higher coronary artery disease mortality. Enhanced platelet aggregation in platelet-rich plasma has also been described in the elderly. To define age-related changes in primary hemostasis, we studied 37 elderly and 31 young blood donors. There were no significant age-related differences in whole-blood platelet aggregation, platelet adherence and thrombus formation on human umbilical artery segments, or bleeding time. Plasma fibrinogen was significantly higher in elderly men and women, whereas activated factor VII was elevated only in elderly women. Collagen-induced platelet aggregation was significantly correlated with platelet adherence to the subendothelium in elderly (r=.488, P=.002) but not in young donors. Accordingly, collagen-induced platelet aggregation showed a significant inverse correlation with bleeding time only in the elderly (r=.401, P=.014). Arachidonic acid-induced platelet aggregation was significantly associated with platelet adherence to the subendothelium (r=.658, P=.003) and bleeding time (r=.540, P=.021) only in elderly men. In young donors, ADP-induced platelet aggregation was significantly correlated with platelet adherence to the thrombogenic adventitial surface (r=.395, P=.031); in the elderly this association only approached significance (r=.315, P=.058). Whole-blood platelet aggregation in response to collagen and arachidonic acid may be more useful in predicting primary hemostatic function in the elderly than in the young. Furthermore, in the elderly, the correlation between platelet aggregation in whole blood and platelet-arterial wall interactions in vitro and in vivo may contribute to the ability of this test to predict coronary risk.
AB - Increased platelet aggregation is associated with higher coronary artery disease mortality. Enhanced platelet aggregation in platelet-rich plasma has also been described in the elderly. To define age-related changes in primary hemostasis, we studied 37 elderly and 31 young blood donors. There were no significant age-related differences in whole-blood platelet aggregation, platelet adherence and thrombus formation on human umbilical artery segments, or bleeding time. Plasma fibrinogen was significantly higher in elderly men and women, whereas activated factor VII was elevated only in elderly women. Collagen-induced platelet aggregation was significantly correlated with platelet adherence to the subendothelium in elderly (r=.488, P=.002) but not in young donors. Accordingly, collagen-induced platelet aggregation showed a significant inverse correlation with bleeding time only in the elderly (r=.401, P=.014). Arachidonic acid-induced platelet aggregation was significantly associated with platelet adherence to the subendothelium (r=.658, P=.003) and bleeding time (r=.540, P=.021) only in elderly men. In young donors, ADP-induced platelet aggregation was significantly correlated with platelet adherence to the thrombogenic adventitial surface (r=.395, P=.031); in the elderly this association only approached significance (r=.315, P=.058). Whole-blood platelet aggregation in response to collagen and arachidonic acid may be more useful in predicting primary hemostatic function in the elderly than in the young. Furthermore, in the elderly, the correlation between platelet aggregation in whole blood and platelet-arterial wall interactions in vitro and in vivo may contribute to the ability of this test to predict coronary risk.
KW - aging
KW - factor VII
KW - fibrinogen
KW - platelet adherence
KW - platelet aggregation
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U2 - 10.1161/01.ATV.15.6.748
DO - 10.1161/01.ATV.15.6.748
M3 - Article
C2 - 7773728
AN - SCOPUS:0029044333
SN - 1079-5642
VL - 15
SP - 748
EP - 753
JO - Arteriosclerosis, Thrombosis, and Vascular Biology
JF - Arteriosclerosis, Thrombosis, and Vascular Biology
IS - 6
ER -