Assessment of metabolic and hemostatic profile of apheresis platelet concentrates: does the storage medium play a role?

BACKGROUND: The impact of pathogen reduction technology (PRT) on metabolic and haemostatic profile of treated platelets remains a subject of debate. Platelets Additive Solutions (PASs) are suggested as more appropriate storage medium compared to plasma. To investigate this in terms of zero heterogeneity PRT-treated and control apheresis platelet concentrates (PCs), collected from the same donors and stored in PAS and plasma respectively, were analyzed. MATERIALS AND METHODS: In the first arm of the study six double dose-apheresis PCs were produced, split and stored in plasma, while in the second arm six split double dose-apheresis PCs from the same donors, were produced and stored in PAS. Control and PRT-treated PCs resulted in both arms. Metabolic and haemostatic markers were evaluated in all the examined groups on days 1, 3 and 5. RESULTS: A time dependent increased metabolism both in PAS and plasma-stored PCs was evident in PRT-treated PCs. However, the metabolic profile was better preserved in PCs stored in PAS, as higher pH (6.8 vs 6.5, p=0.007) and lower lactate levels (12.6 vs 17.8 mmol/L, p=0.009) were documented in PRT-treated PAS-PCs compared to plasma-PCs, on day 5. A time dependent decreased hemostatic capacity regardless the storage medium was evident in PRT-treated PCs, (PAS-PCs MCF, p=0.004 and plasma-PCs MCF, p=0.007). Similar results were obtained in control PCs. DISCUSSION: The use of PAS preserves the metabolic profile of PCs more adequately compared to plasma but has no effect on the haemostatic profile. The clinical relevance of these findings needs further investigation.

The effects of pathogen reduction technology on apheresis platelet concentrates stored in PAS.

BACKGROUND: The impact of pathogen reduction technology (PRT) such as Mirasol, and the effect of platelet additive solutions (PAS) on the activity and hemostatic profile of transfused apheresis platelets remain largely unknown. The aim of this study was to assess the in vitro hemostatic and metabolic profile of Mirasol treated platelets in PAS during a 7-day storage period. MATERIAL AND METHODS: Ten split bags containing apheresis platelets stored in PAS were split into two groups; control platelets (No.=10 units) and PRT-treated platelets (No.=10 units). In vitro evaluation of the platelet components was performed on the 1st, 3rd, 5th, and 7th days of the storage period. Several metabolic parameters including pH, glucose, and lactate levels were evaluated, while assessment of their hemostatic capacity was performed using light transmission aggregometry (LTA) and viscoelastic studies such as rotational thromboelastometry (ROTEM) and thromboelastography (TEG). Last, Annexin V levels were measured though flow cytometry for evaluation of platelet activation. RESULTS: Clot strength, as reflected by the maximum clot firmness (MCF) and the maximum amplitude (MA) parameters of the viscoelastic studies was significantly decreased in the PRT-treated platelets compared to the control platelets (p<0.05). Clot strength based on MCF and MA values was also found to be decreasing over storage time in PRT-treated platelets (p<0.001), while this was not evident in control platelets. Moreover, the comparison between pH, glucose, and lactate levels were indicative of increased metabolic activity in PRT-treated platelets compared to control platelets (p<0.001). Last, Annexin-V was significantly higher in PRT-treated platelets compared to control platelets on the 7th day of the storage period (p<0.001). DISCUSSION: The results of this study indicate that increased PSL induced by PRT treatment leads to a decreased in vitro platelet hemostatic efficacy and increased metabolic activity. However, the clinical impact of these alterations needs further investigation.

Sepsis-Induced Coagulopathy: An Update on Pathophysiology, Biomarkers, and Current Guidelines.

Significant cross talk occurs between inflammation and coagulation. Thus, coagulopathy is common in sepsis, potentially aggravating the prognosis. Initially, septic patients tend to exhibit a prothrombotic state through extrinsic pathway activation, cytokine-induced coagulation amplification, anticoagulant pathways suppression, and fibrinolysis impairment. In late sepsis stages, with the establishment of disseminated intravascular coagulation (DIC), hypocoagulability ensues. Traditional laboratory findings of sepsis, including thrombocytopenia, increased prothrombin time (PT) and fibrin degradation products (FDPs), and decreased fibrinogen, only present late in the course of sepsis. A recently introduced definition of sepsis-induced coagulopathy (SIC) aims to identify patients at an earlier stage when changes to coagulation status are still reversible. Nonconventional assays, such as the measurement of anticoagulant proteins and nuclear material levels, and viscoelastic studies, have shown promising sensitivity and specificity in detecting patients at risk for DIC, allowing for timely therapeutic interventions. This review outlines current insights into the pathophysiological mechanisms and diagnostic options of SIC.

Pathogen Reduction Technologies and Their Impact on Metabolic and Functional Properties of Treated Platelet Concentrates: A Systematic Review.

Pathogen reduction technologies (PRTs) such as Mirasol and Intercept were developed to eliminate transfusion-transmitted infections. The impact of PRTs on platelet function during the storage period, their effect on platelet storage lesions, and the optimal storage duration following PRTs have not been clearly defined. The aim of this study was to systematically review the existing literature and investigate the impact of PRTs on functional alterations of PRT-treated platelets during the storage period. The authors identified 68 studies suitable to be included in this review. Despite the high heterogeneity in the literature, the results of the published studies indicate that PRTs may increase platelet metabolic activity, accelerate cell apoptosis, and enhance platelet activation, which can subsequently lead to a late exhaustion of activation potential and reduced aggregation response. However, these effects have a minor impact on platelet function during the early storage period and become more prominent beyond the fifth day of the storage period. Large in vivo trials are required to evaluate the effectiveness of PRT-treated platelets during the storage period and investigate whether their storage can be safely extended to more than 5 days, and up to the traditional 7-day storage period.