[Show abstract][Hide abstract] ABSTRACT: Pathogen inactivation procedure performed just before distribution of platelet concentrates (PCs) may decrease costs caused by loss of these components due to relatively short expiry date.
To evaluate the quality of PCs pathogen inactivated on the first or the fifth day of storage.
PCs preparated from buffy-coats were suspended in platelet additive solution (Intersol, Baxter Healthcare Corporation, Belgium). The photochemical pathogen inactivation was performed on the 1st or the 5th day of storage using amotosalen and UVA (Cerus, Europe BV). PCs were stored for 7 days.
There were observed increased expression of CD62 and CD63, elevated activity of LDH and lower concentration of glucose in PCs pathogen inactivated on day 1 compare to the control group. PCs pathogen inactivated on day 5 showed decreased expression of CD62 and CD63 compare to the control group. There were no significant differences in platelet number, pH, lactate concentration, hypotonic shock response and release of platelet derived microparticles in both groups of pathogen inactivated PCs.
Time of storage of PCs before pathogen inactivation has no significant impact on PCs quality. Pathogen inactivation procedure performed just after having received request for PCs is more cost effective than the routine pathogen inactivation in all PCs before storage.
Polski merkuriusz lekarski: organ Polskiego Towarzystwa Lekarskiego 03/2011; 30(177):187-90.
[Show abstract][Hide abstract] ABSTRACT: Platelet recovery, and viability, and function is strongly dependent on the method of the preparation of platelet concentrate (PC). The glucose consumption, decrease of pH, release of alpha granules during storage in platelet concentrate impair their clinical effectiveness.
To compare of the quality of buffy-coat-derieved platelet concentrates prepared using automatic system terumo automated centrifuge and separator integration (TACSI) and stored over 7 days.
PCs were prepared from buffy coats using manual method (group I), or automatic system TACSI (group II). Fifteen PCs prepared from the 5 buffy coats each were stored over 7 days in 22-24 degrees C and tested. Samples were taken from the PCs container on days 1 and 7. The following laboratory tests were performed: number of platelets, platelets derived microparticles, CD62P expression, platelet adhesion, pH, glucose, lactate dehydrogenase activity.
We have observed higher expression of CD62P in PCs prepared using manual method compared to the PCs produced automatically Platelet recovery was significantly higher in PCs prepared using automatic systems compare to manual method.
Compared to manual methods, automatic system for preparation of buffy coats, is more efficient and enable production of platelets concentrates of higher quality.
Polski merkuriusz lekarski: organ Polskiego Towarzystwa Lekarskiego 03/2011; 30(177):191-4.
[Show abstract][Hide abstract] ABSTRACT: Short-term and saturated simulated dives followed by decompression with air, cause a decrease in platelet count and increased activation of fibrinolysis. The aim of this study was to determine whether short-term dives with trimix as a breathing mixture induce the activation of platelets, and/or fibrinolysis.
30 male divers were subjected to short-term hyperbaric exposures to 0.7 MPa. Thirty divers used air and then the same divers used trimix as a breathing mixture. Results: The mean platelet count dropped significantly after decompression only in the group breathing air. The number of CD62P positive platelets and the amount of platelet-derived micro particles were statistically significant higher after decompression in both exposures. The number of CD61 positive platelets increased significantly only in the group breathing air. We observed a significant decrease of factor XII and fibrinogen concentrations after decompression only in the group breathing air. A significant increase in the concentration of plasminantiplasmin complex in both groups was detected.
Short-term hyperbaric exposure and decompression performed according to current safety standards activates platelets and the fibrinolytic system. Trimix protects divers from a reduction in the amount of platelets, fibrinogen and factor XII in the course of these exposures.
Advances in Medical Sciences 12/2010; 55(2):313-6. DOI:10.2478/v10039-010-0050-3 · 1.11 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The Doppler technique is currently the usual method for detection of bubbles in the circulation following decompression. However, cases of decompression sickness (DCS) frequently occur in the absence of detectable bubbles, so that other markers for increasing risk of DCS would be welcome. This study assessed the hemostatic effects of compressed-air saturation dives that conformed to the "safe" limits of accepted decompression tables.
We measured coagulation times, thrombin generation, platelets, and fibrinolysis in 21 male divers who were subjected to saturated hyperbaric exposures to 0.28-0.3 MPa (corresponds to 18-20 msw). Each diver did one dive.
Pooled before- and after-dive data for all exposures showed after decompression, statistically significant changes included decrease of the mean platelet count after, increased induced platelet aggregation and number of platelet aggregates, increased number of P-selectin (CD62P) positive platelets and CD62P density on platelets, increase of platelet derived microparticles in the blood of the divers, decrease of factor XII, X, and fibrinogen concentrations, and marked increase of plasmin-antiplasmin complex concentration. Thrombin activation markers and coagulation times did not change significantly.
Saturated hyperbaric exposures followed by nominally safe decompression led to activation of platelets and the fibrinolytic system. The probable mechanism for the activation of platelets and fibrinolysis is contact with the surface of evolved bubbles in the divers' circulation.
Aviation Space and Environmental Medicine 06/2010; 81(6):585-8. DOI:10.3357/ASEM.2626.2010 · 0.88 Impact Factor