scholarly journals ADAMTS13 activity to von Willebrand factor antigen ratio predicts acute kidney injury in patients with COVID‐19: Evidence of SARS‐CoV‐2 induced secondary thrombotic microangiopathy

2020 ◽  
Author(s):  
Brandon Michael Henry ◽  
Stefanie W. Benoit ◽  
Maria Helena Santos Oliveira ◽  
Giuseppe Lippi ◽  
Emmanuel J. Favaloro ◽  
...  
Keyword(s):  
Acute Kidney Injury ◽  
Von Willebrand Factor ◽  
Thrombotic Microangiopathy ◽  
Kidney Injury ◽  
Adamts13 Activity ◽  
Von Willebrand Factor Antigen ◽  
Von Willebrand ◽  
Willebrand Factor ◽  
Factor Antigen

scholarly journals von Willebrand Factor Antigen, von Willebrand Factor Propeptide, and ADAMTS13 in Carotid Stenosis and Their Relationship with Cerebral Microemboli

2020 ◽  
Author(s):  
Stephen J. X. Murphy ◽  
Soon Tjin Lim ◽  
Fionnuala Hickey ◽  
Justin A. Kinsella ◽  
Deirdre R. Smith ◽  
...  
Keyword(s):  
Ischemic Stroke ◽  
Carotid Stenosis ◽  
Blood Group ◽  
Von Willebrand Factor ◽  
Adamts13 Activity ◽  
Von Willebrand Factor Antigen ◽  
Asymptomatic Patients ◽  
Von Willebrand ◽  
Willebrand Factor ◽  
Factor Antigen

Abstract Background The relationship between von Willebrand factor antigen (VWF:Ag), VWF propeptide (VWFpp), VWFpp/VWF:Ag ratio, ADAMTS13 activity, and microembolic signal (MES) status in carotid stenosis is unknown. Methods This prospective, multicenter study simultaneously assessed plasma VWF:Ag levels, VWFpp levels and ADAMTS13 activity, and their relationship with MES in asymptomatic versus symptomatic moderate-to-severe (≥50–99%) carotid stenosis patients. One-hour transcranial Doppler ultrasound of the middle cerebral arteries classified patients as MES+ve or MES−ve. Results Data from 34 asymptomatic patients were compared with 43 symptomatic patients in the “early phase” (≤4 weeks) and 37 patients in the “late phase” (≥3 months) after transient ischemic attack (TIA)/ischemic stroke. VWF:Ag levels were higher (p = 0.049) and VWFpp/VWF:Ag ratios lower (p = 0.006) in early symptomatic than in asymptomatic patients overall, and in early symptomatic versus asymptomatic MES−ve subgroups (p ≤0.02). There were no intergroup differences in VWFpp expression or ADAMTS13 activity (p ≥0.05). VWF:Ag levels and ADAMTS13 activity decreased (p ≤ 0.048) and VWFpp/VWF:Ag ratios increased (p = 0.03) in symptomatic patients followed up from the early to late phases after TIA/stroke. Although there were no differences in the proportions of symptomatic and asymptomatic patients with blood group O, a combined analysis of early symptomatic and asymptomatic patients revealed lower median VWF:Ag levels in patients with blood group O versus those without blood group O (9.59 vs. 12.32 µg/mL, p = 0.035). Discussion VWF:Ag expression, a marker of endothelial ± platelet activation, is enhanced in recently symptomatic versus asymptomatic carotid stenosis patients, including in MES−ve patients, and decreases with ADAMTS13 activity over time following atherosclerotic TIA/ischemic stroke.

scholarly journals Plasma levels of von Willebrand factor antigen in acute bronchitis and in a normal population

1998 ◽  
Vol 92 (3) ◽  
pp. 395-400 ◽  
Author(s):  
D.A.R. Boldy ◽  
P.E. Short ◽  
P. Cowen ◽  
F.G.H. Hill ◽  
D.C. Chambers ◽  
...  
Keyword(s):  
Von Willebrand Factor ◽  
Plasma Levels ◽  
Normal Population ◽  
Acute Bronchitis ◽  
Von Willebrand Factor Antigen ◽  
Von Willebrand ◽  
Willebrand Factor ◽  
Factor Antigen

scholarly journals Assessment of Plasma von Willebrand factor antigen in non-metastatic Prostate Cancerpatients: across-sectional study of the Sudanese Population

2019 ◽  
Author(s):  
Mohammed Othman Hashim ◽  
Gad Allah Modawe ◽  
Ibrahim Khider Ibrahim
Keyword(s):  
Prostate Cancer ◽  
Von Willebrand Factor ◽  
Enzyme Linked Immunosorbent Assay ◽  
Sectional Study ◽  
High Concentration ◽  
Cross Sectional ◽  
Von Willebrand Factor Antigen ◽  
Von Willebrand ◽  
Willebrand Factor ◽  
Factor Antigen

Backgrounds: VonWillebrand disease (VWD) is reportedly the most common inherited bleeding disorder and can also arise as an acquired syndrome (AVWS). These disorders arise due to defects and/or deficiency of the plasma protein von Willebrand factor (VWF)..High plasma vWF concentrations have been reported in patients with various types of cancer, such as prostatic cancer.Metastasization may be associated with activation of haemostatic processes resulting in increased levels of circulating factor VIII-related antigen (FVIIIRAg) (von Willebrand factor antigen). Objective: To evaluate the status of VWF AginSudanese patients with Prostate Cancer attending RICK Methodology: This is a cross-sectional study carried out in Khartoum state at Khartoum oncology (RICK) hospital, during the period from April to June 2018, 45 samples were collected from patients with non-metastatic CA prostate, their ages ranged between 51 to 82 years. The vWF level was measured using Enzyme-linked immunosorbent assay (ELISA). Data were analyzed by the statistical package for social science (SPSS).   Results: Serology for vWF antigen was done for 45 cases of prostate cancer. According to the age, 2(8%) of patients with age 51-66 had a high concentration of VWF while 24(92%) had normal vWF antigen concentration; of those with age 67-82 years, 4(21%) had high vWF antigen and 15(79%) had normal antigen. Conclusion: The study revealedthat more than 80% of Sudanese patients withnon-metastatic prostate cancer have anormal concentration of VWF. Keywords: vWF, Prostate cancer, Age, ELISA

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