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>4?weeks from blood transfusions and acute sickle-related complications. Patients on chronic blood transfusion therapy were excluded. Past medical records were reviewed. Acute chest syndrome (ACS), defined as a radiology report of a new pulmonary infiltrate that was not atelectasis on chest x-ray, was documented. Vaso-occlusive crisis (VOC), defined as a painful sickling event that required treatment with opioids and led to a hospital admission during http://www.selleckchem.com/products/3-methyladenine.html the 2?years preceding study enrolment, was documented. The most recent transcranial doppler ultrasound (TCD) reported as being either normal or conditional [according to the Stroke Prevention Trial in Sickle Cell Anaemia (STOP) criteria] and co-existing medical diagnoses of priapism and avascular necrosis were abstracted. Freshly collected EDTA anti-coagulated blood samples were centrifuged at 1500?g, 4��C for 10?min to collect plasma. The unfractionated plasma was subjected to a second spin through a Microcon YM-3 column (Millipore Corporation, Billerica, MA, USA) at 20?000?g, 4��C for 2?h to prepare a protein-depleted plasma http://www.selleckchem.com/products/PD-0325901.html fraction devoid of molecules with a molecular weight >3000 Daltons. Both plasma samples were aliquoted, and stored at ?20��C for batch analysis. The concentration of haem in plasma (whole and protein-depleted) was quantified using a Quantichrome haem assay kit (Bioassay Systems, Hayward, CA) as previously described (Pamplona et?al, 2007). Plasma haemopexin concentration was determined using a specific two-site enzyme-linked immunosorbent assay (ELISA) kit (Kamiya Biomedical, Seattle, WA) following the manufacturer's instructions. Laboratory markers were log-transformed to better approximate normal distributions, with which the statistical power can be improved. Logistic regression models were fitted to assess the association between laboratory markers and clinical outcomes, adjusting for confounders such as age, gender, haematocrit (Hct), and white blood cell (WBC) count. Wald tests were performed to assess the significance of associations and obtain P-values, which were considered statistically significant when http://www.selleck.cn/products/Cisplatin.html the odds of finding a haemolysis risk signal in children, we focused on subjects with diametrically extreme disease phenotypes, as defined by ACS incidence. Eighty-one subjects were enrolled, 75 (92��6%) with HbSS and 6 (7��4%) with HbS��0 thalassaemia genotypes. Forty-six subjects (56��8%) had a history of multiple ACS, while the remainder (n?=?35) had no history of ACS. Among all the subjects enrolled, 34 (42%) had presented with VOC within the 2?years preceding study enrolment. Four subjects (4��9%) had avascular necrosis (AVN), and 7 (11��67%) conditional TCDs. Priapism had been diagnosed in six male subjects (18��2%). Mean age was 9��81?��?4?years and the male to female ratio was 1:1��08.
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