View clinical trials related to Hemolysis.
Filter by:The conventional treatment in warm-antibody dependent autoimmune haemolytic anaemia (AIHA) is high-dose glucocorticoid, but in more than half of the patients, haemolytic activity will recur after end of treatment or during the gradual reduction in dose of the drug. As a result, many patients will finally be splenectomized or be treated with long-term glucocorticoids or other immunosuppressive drugs as azathioprine or cyclophosphamide. Recent studies have shown however, that some patients will respond to treatment with the chimeric anti-CD 20 antibody Rituximab and is some cases, the response is permanent. In most of the studies, Rituximab has been used in refractory disease or at least as second line treatment. In this study, patients with AIHA are randomized to receive either high-dose prednisolone with gradual reduction in dose over 2-3 months alone or in combination with Rituximab 375 mg/m2 once a week for 4 weeks. The efficacy of Rituximab will be evaluated by a comparison of the patients in the two treatment arms. The primary treatment goal is a reduction in the number of patients who obtain long-term complete or partial remission. The secondary treatment goal is a reduction in patients who will be splenectomised or receive other immunosuppressive drugs. Finally a comparison of side effects of the treatments will take place.
The primary hypothesis of this study is that glutamine supplementation will improve the erythrocyte glutamine/glutamate ratio, a biomarker of oxidative stress, hemolysis and pulmonary hypertension (PH) in sickle cell disease (SCD) and thalassemia (Thal) patients with PH. PH is defined as a tricuspid regurgitant jet velocity (TRV) on Doppler echocardiography > 2.5 m/s. We also predict that glutamine therapy will increase arginine bioavailability and subsequently alter sickle red cell endothelial interaction that can be identified using endo-PAT technology through nitric oxide (NO) generation, leading to changes in biological markers, and clinical outcome. Specifically our second hypothesis is that oral glutamine will decrease biomarkers of hemolysis and adhesion molecules, and improve the imbalanced arginine-to-ornithine ratio that occurs in hemolytic anemias, leading to improved arginine bioavailability and clinical endpoints of endothelial dysfunction and PH in patients with SCD and Thal.
Atypical hemolytic uraemic syndrome is caused by defects in the regulating factors in the alternative pathway of the complement system. Triggering can cause an uncontrolled complement activation with endothelial damage and thrombotic micro-angiopathy, especially in the kidneys. This can result in endstage renal failure. Complement activation during hemodialysis has been described as a result of contact between blood and the dialysis membrane. Our hypothesis is that patients with atypical hemolytic uraemic syndrome have a stronger complement activation during hemodialysis than patients with another underlying kidney disease. This could be a reason to treat patients with endstage renal failure due to atypical hemolytic uraemic syndrome preferentially with peritoneal dialysis instead of hemodialysis.
The purpose of this research study is to more accurately measure the amount of true red blood cell breakdown (hemolysis) in newborn babies with potentially problematic blood type mismatch with their mothers (ABO incompatibility), and to examine how the true level of red blood cell destruction relates to other laboratory tests obtained in newborns with jaundice. A better understanding of the true amount of red blood cell destruction that is caused by blood type mismatch, as well as how it relates with other laboratory tests ordered for ABO incompatibility and red blood cell destruction, would help avoid unnecessary testing, treatment and prolonged hospital stays in such babies.
Background: - Probiotics are oral food supplements containing live bacteria that may be beneficial to a person s digestion or general health. Probiotics are available as tablets, powder, or liquid supplements and are frequently used to supplement yogurt. They are available for purchase without prescription in most supermarkets. - The bacteria in probiotic supplements commonly express sugar substances on their surface. These sugar substances are similar to group A and B blood group sugars, called antigens. These antigens determine a person s blood group. Researchers are studying the effect of probiotic supplements on the amount of blood group antibodies that are present in a person s blood. Objectives: - To determine whether taking oral probiotic supplements increases anti-A and anti-B isoagglutinins (antibodies that cause red blood cells to clump together) in healthy subjects. - To study the frequency of these effects and determine whether there is a dose-response relationship with probiotics and isoagglutinin titers. Eligibility: - Healthy adults, 18 years or older, with type A, B, or O blood. - Female participants need to have undergone menopause or have had a hysterectomy. - Individuals are ineligible if they currently donate platelets; have a history of ulcerative colitis or Crohn s disease; have had major bowel surgery; are pregnant or capable of becoming pregnant; have a bleeding or clotting disorder; have a history of a blood disorder or immune deficiency; have a history of high-risk behaviors for exposure to HIV or hepatitis B or C; have diabetes; have received vaccinations in the past 2 months, with the exception of the flu vaccine; are currently taking immunosuppressive medications; are currently taking antibiotics; or have taken probiotic supplements within the last 12 months. Design: - Researchers will conduct the following tests throughout the 28-week study: - Blood samples will be drawn every 2 weeks to measure the quantity of isoagglutinin titers. - Depending on individual results, continued blood testing may be done every 3 months for 1 year, then every 6 to 12 months for up to 5 years. - Study subjects will take a probiotic supplement at a dose of 1 to 3 caplets per day for 18 consecutive weeks according to the following schedule: - During the first 6-week period, the subject will take one probiotic tablet daily. - During the second 6-week period, the subject will take one probiotic tablet twice daily. - During the third 6-week period, the subject will take one probiotic tablet three times daily. - Control group subjects will be followed in a similar manner but will not take probiotic supplements. - The outcome measure is the percent of probiotic ingestors (the study subjects) versus control group subjects who experience a fourfold or greater rise in isoagglutinin titer. - Study subjects will receive the following financial compensation: $10 per blood sample, for a maximum of $240 if all 24 samples are collected; $100 after completing the first 6-week period; $150 after completing the second 6-week period; and $200 after completing the third 6-week period. - Control subjects will receive $10 per blood sample, for a maximum of $150 if all 15 samples are collected.
The purpose of this study is to determine whether eculizumab is safe and effective in the treatment of adolescent patients with plasma therapy-resistant Atypical Hemolytic-Uremic Syndrome (aHUS).
The purpose of this study is to determine whether eculizumab is safe and effective in the treatment of adult patients with plasma therapy-resistant Atypical Hemolytic-Uremic Syndrome (aHUS).
The purpose of this study is to determine whether eculizumab is safe and effective in the treatment of adolescent patients with plasma therapy-sensitive Atypical Hemolytic-Uremic Syndrome (aHUS).
The purpose of this study is to determine whether eculizumab is safe and effective in the treatment of adult patients with plasma therapy-sensitive Atypical Hemolytic-Uremic Syndrome (aHUS).
The purpose of this study is to determine if propofol could protect erythrocytes by directly scavenging free radicals from the blood current and increasing resistance of their cell membranes in patients submitted to gastroplasty.