Inhibition by Ethanol of Shear Stress-Induced Formation of Platelet Thrombi in Whole Blood.
Level 5 - mechanism / opinion, no new human data
In vitro bench research using whole blood
PubMed 30462159 · doi:10.1093/alcalc/agy081
What was done
Investigators tested the effects of ethanol (0.125% to 1%) on shear stress-induced platelet thrombus formation in whole blood using a total thrombus-formation analysis system. Samples were subjected to low (1000 s-1), middle (1500 s-1), and high (2000 s-1) shear rates. The times required to reach flow pressure increases of 10 kPa (T10), 30 kPa (T30), and 50 kPa (T50) inside microchips were recorded to evaluate early versus later thrombus generation.
What was found
The abstract reports directional statistical significance without providing exact values, sample sizes, or p-values. Under low-grade and middle-grade shear rates, T10 and T30 were significantly longer with 0.25–1% ethanol compared with control. At 0.125% ethanol, T10 at low-grade shear and T30 at low- and middle-grade shear were also significantly prolonged. In contrast, T50 under low- and middle-grade shear did not differ significantly with 0.125%, 0.25%, or 0.5% ethanol. Under high-grade shear rate, ethanol at lower concentrations caused no significant differences in T10, T30, or T50.
Why it matters
This provides a plausible mechanistic explanation for the epidemiological observation that moderate alcohol consumption correlates with lower thromboatherosclerotic risk, specifically by retarding initial shear-induced platelet activation.
Limits
The study is an in vitro flow system lacking vascular endothelium, counter-regulatory mechanisms, and in vivo hemodynamic conditions. The abstract omits sample size, donor characteristics, absolute time measurements, and effect size metrics. The inhibitory effect was absent under high shear stress and at later stages of clot consolidation (T50).
Cited by
- supports Alcohol reduces platelet aggregation, making platelets less likely to form clots.