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- W2007759901 abstract "<i>Background:</i> In previous studies, neonatal platelets have been shown to be hypoaggregable to various agonists when compared with adult platelets. <i>Objectives:</i> It was the aim of this study to investigate the aggregability of neonatal versus adult platelets when the physiological relevant agonist collagen/endogenous thrombin is used. <i>Methods and Results:</i> Whole blood (WB) aggregation experiments employing the impedance method revealed the same responsiveness of neonatal and adult platelets to collagen/endogenous thrombin. Maximum aggregation (13.5 ± 3.2 vs. 13.6 ± 3.2 Ω; p = 0.94), slope (5.8 ± 1.8 vs. 6.2 ± 2.6 Ω/min; p = 0.79) and lag time until the onset of platelet aggregation (38.7 ± 8.9 vs. 42.6 ± 16.5 s; p = 0.59) were similar in cord and adult WB. However, the rise in serotonin plasma levels due to platelet activation was significantly lower in neonates versus adults (227.57 ± 57.65 vs. 473.34 ± 155.75 ng/ml; p = 0.0001). Furthermore, we found a fast capability of cord plasma to generate (the efficient platelet agonist) endogenous thrombin: thrombin generation started significantly earlier in cord compared with adult plasma (215 ± 19 vs. 247 ± 21 s; p = 0.01). Moreover, thrombelastometry revealed significantly shorter coagulation times in cord versus adult WB activated with collagen/endogenous thrombin (229.8 ± 12.5 vs. 256.3 ± 25.3 s; p = 0.003). <i>Conclusions:</i> The efficient platelet aggregation in cord WB provoked by collagen/endogenous thrombin might help to explain the clinically observed well-functioning primary hemostasis of neonates." @default.
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- W2007759901 date "2008-09-16" @default.
- W2007759901 modified "2023-10-16" @default.
- W2007759901 title "Collagen/Endogenous Thrombin-Induced Platelet Aggregation in Cord versus Adult Whole Blood" @default.
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- W2007759901 doi "https://doi.org/10.1159/000155613" @default.
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