Effect of plasma freezing temperature, anticoagulant and time of storage on factor VIII: C activity in cryoprecipitate

The influence of ACD and CPDA-1 anticoagulants, and storage time for 3 and 6 months on F VIII:C activity were compared in cryprecipitate obtained at -70ºC, and -30ºC plasma freezing temperature. To eliminate variations in F VIII:C activity between donor plasma, the cryoprecipitation at -70ºC and -30ºC was made in paired plasma volumes (approximately 100 ml) from each blood unit. Employing ACD plasmas (n= 50), there was no significant difference in F VIII:C activity between cryoprecipitate prepared at -70ºC (X=31.1 IU/bag) and -30ºC was made in paired plasma volumes (approximately 100 ml) from each blood unit. Employing ACD plasmas (n= 50), there was no significant difference in F VIII:C activity between cryprecipitate prepared at -70ºC (X= 31.1 IU/bag) and -30ºC (X = 30.5 IU/bag), and the storage did not modifify FVIII:C activity. In contrast, in cryprecipitate prepared from CPDA-1 plasma (n= 31), the F VIII:C levels obtained at-30ºC (X= 43.8IU/bag) were significantly higher than those at-70ºC (X=37.3 IU/bag), but a deterioration of F VIII:C activity (about 50 percent) was observed after 6 months of cryprecipitate storage. Therefore, if cryprecipitate is stored it stored it would be more convenient to use ACD instead of CPDA-1 and make cryoprecipitation either at-70ºC or-30ºC

Ferritin and malignant hemopathies.I.Ferritin in cerebrospinal fluid as an indicator of central nervous system leukemic involment.

La infiltracion del sistema nervioso central (SNC) por celulas leucemicas es una complicacion que se presenta cada vez con mayor frecuencia. El diagnostico de infiltracion leucemica se confirma por la observacion de celulas malignas en el liquido cefalorraquideo (LCR). No obstante, la evaluacion morfologica de las celulas resulta dificil, ya que estas pierden frecuentemente su morfologia debido a las caracteristicas fisicas del LCR y porque en ocasiones la celulas leucemicas se encuentran confinadas unicamente al parenquima cerebral. Para demonstrar la infiltracion leucemica del SNC se midieron los niveles de ferritina en el LCR mediante una tecnica inmunorradiometrica. Los pacientes con infiltracion del SNC tuvieron niveles mas altos de ferritina en el LCR (11.2 +/- 1.4 ug/l) que los enfermos con leucemia aguda que no presentaban esta complicacion (p = 0.001). Los niveles de ferritina en LCR en el grupo control y en los enfermos con leucemia aguda sin infiltracion leucemica fueron casi identicos 4.4 +/- 0.6 y 4.5 +/- 0.7 ug/l respectivamente.Estos hallazgos sugieren que la dosificacion de ferritina en el LCR puede ser de utilidad en el diagnostico de esta grave complicacion