Titre : Sondes d'acide nucléique

Sondes d'acide nucléique : Questions médicales fréquentes

Termes MeSH sélectionnés :

Platelet Function Tests
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Sources (10000 au total)

On-treatment platelet reactivity through the thromboxane A

Pelacarsen decreases plasma levels of lipoprotein(a) [Lp(a)] and oxidized phospholipids (OxPL). It was previously reported that pelacarsen does not affect the platelet count. We now report the effect ... Subjects with established cardiovascular disease and screening Lp(a) levels ≥60 mg per deciliter (~ ≥150 nmol/L) were randomized to receive pelacarsen (20, 40, or 60 mg every 4 weeks; 20 mg every 2 we... Of the 286 subjects randomized, 275 had either an ARU or PRU test, 159 (57.8%) were on aspirin alone and 94 (34.2%) subjects were on dual anti-platelet therapy. As expected, the baseline ARU and PRU w... Pelacarsen does not modify on-treatment platelet reactivity through the thromboxane A...

Multicenter evaluation of light transmission platelet aggregation reagents: communication from the ISTH SSC Subcommittee on Platelet Physiology.

Light transmission aggregation (LTA) is used widely by the clinical and research communities. Although it is a gold standard, there is a lack of interlaboratory harmonization.... The primary objective was to assess whether sources of activators (mainly adenosine diphosphate [ADP], collagen, arachidonic acid, epinephrine, and thrombin receptor activating peptide6) and ristoceti... An international multicenter study involving 28 laboratories in which we compared LTA results obtained with center-specific activators and a comparator that we supplied.... We report variability in the potency (P) of activators in comparison with the comparator. Thrombin receptor activating peptide 6 (P, 1.32-2.68), arachidonic acid (P, 0.87-1.43), and epinephrine (P, 0.... Based on these data, the establishment and adoption of simple standardization principles should mitigate variability due to activator sources. The observation of huge interindividual variability for c...

Postinjury platelet aggregation and venous thromboembolism.

Posttraumatic venous thromboembolism (VTE) remains prevalent in severely injured patients despite chemoprophylaxis. Importantly, although platelets are central to thrombosis, they are not routinely ta... We performed a secondary analysis of 133 severely injured patients from a prospective observational study investigating coagulation and inflammation (2011-2019). Platelet aggregation in response to st... The 133 patients were severely injured (median Injury Severity Score, 25), and 14% developed VTE (all >48 hours after admission). At presentation, platelet count and PA were not significantly differen... Severely injured patients with decreasing ex vivo measures of PA despite resuscitation have an increased risk of developing VTE. This may have implications for predicting development of VTE and for st... Prognostic/Epidemiological; Level III....

Gamma and X-ray irradiation do not affect the in vitro quality of refrigerated apheresis platelets in platelet additive solution (PAS-E).

Platelet refrigeration (cold storage) provides the advantages of an extended shelf life and reduces the risk of bacterial growth, compared to platelets stored at room temperature (RT). However, proces... Triple-dose apheresis platelets were collected in 40% plasma/60% PAS-E, using the TRIMA apheresis platform, and refrigerated (2-6°C) within 8 h of collection. On day 2, one of each component was gamma... The platelet concentration decreased by approximately 20% in all groups during 21 days of storage (p > .05). Irradiation (gamma or X-ray) did not affect platelet metabolism, and the pH was maintained ... Gamma and X-ray irradiation do not affect the in vitro quality of platelet components stored in the cold for up to 21 days. This demonstrates the acceptability of irradiating cold-stored platelets, wh...

In vitro quality of cold and delayed cold-stored platelet concentrates from interim platelet units during storage for 21 days.

Based on previous success using apheresis platelets, we wanted to investigate the in vitro quality and platelet function in continuously cold-stored and delayed cold-stored platelet concentrates (PCs)... We used a pool-and-split design to prepare 18 identical pairs of PCs. One unit was stored unagitated and refrigerated after production on day 1 (cold-stored). The other unit was stored agitated at roo... All PCs complied with European recommendations (EDQM 20th edition). Both groups had mean platelet content >200 × 10... Our findings suggest that PCs from IPUs are suitable for cold storage from day 1 until day 21 and delayed cold storage from day 5 until day 14....

Hyperbaric treatment of platelets extends in vitro storage to 14 days.

Platelets for transfusion have a storage time of 5-7 days at 22°C-24°C, which results in a strain on the supply chain and supply shortages. We describe a novel method to extend platelet storage using ... Apheresis platelets (APU) prepared in 65% platelet additive solution (PAS) were stored under standard conditions (SC) at 20°C-24°C to Day 5. Paired APUs were prepared with Xe and stored to Day 14 at 2... XHC platelets were viable out to Day 14. The average pH of Day 14 platelets was 6.58, and 86% maintained some degree of swirl compared with 7.02 and 100% swirl for Day 5 SC platelets. The rate of glyc... Platelet storage with the Xe/hyperbaric/cold method is a feasible candidate for extension of storage to 14 days based on in vitro characteristics. In vivo recovery and survival studies are indicated. ...

Cell Surface Platelet Tissue Factor Expression: Regulation by P2Y

ADP-induced platelet activation leads to cell surface expression of several proteins, including TF (tissue factor). The role of ADP receptors in platelet TF modulation is still unknown. We aimed to as... The effects of P2Y... In blood from healthy subjects, stimulated in vitro by ADP, the percentage of TF... Data show that TF expression is regulated by P2Y...