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Feasibility of the Von Willebrand disease PREVENT trial.

Abstract：

BACKGROUND:Despite treatment, women with von Willebrand disease (VWD) have lower von Willebrand factor (VWF) levels and greater blood loss at delivery than controls. Current weight-based dosing does not account for the ~1.5-fold increase in blood volume in pregnancy. METHODS:To evaluate the feasibility of a trial to prevent postpartum hemorrhage (PPH), we reviewed pre-pregnancy and 8th month VWF levels in women with VWD with and without PPH following vaginal delivery, assessed VWF concentrate use at delivery by U.S. hemophilia treatment center physician survey, and reviewed thrombosis risk with VWF concentrate by literature review. We determined trial interest and acceptability by structured interviews of physicians and patients. Analysis was by Student's t-test for continuous data, and chi-square or Fisher's exact test for discrete data. RESULTS:PPH was associated with lower pre-pregnancy VWF:RCo, p<0.005; higher pre-pregnancy, 8th and 9th-month weight, each p<0.001; a family bleeding history, p=0.036; and VWF concentrate treatment, p=0.005. Surveyed physicians reported first-line therapy at delivery was VWF concentrate, at a mean dose 50IU/kg. A trial of a 1.5-fold volume-based dose increase was acceptable to physicians and patients, if it is safe and if costs and visits are minimized. A literature review determined thrombosis risk with VWF concentrate is low, 0.4%. CONCLUSIONS:This study suggests pre-pregnancy VWF:RCo may predict PPH, but 50-80IU/kg VWF concentrate dosing may not prevent PPH. If pharmacokinetic modeling confirms volume-based dosing achieves VWF levels comparable to pregnant controls, it may be possible to determine if volume-modified VWF concentrate dosing will reduce PPH in VWD.

journal_name

Thromb Res

journal_title

Thrombosis research

authors

Ragni MV,Machin N,James AH,Seaman CD,Malec LM,Kessler CM,Konkle BA,Kouides PA,Neff AT,Philipp CS,Brooks MM

doi

10.1016/j.thromres.2017.05.022

subject

Has Abstract

pub_date

2017-08-01 00:00:00

pages

8-13

eissn

0049-3848

issn

1879-2472

pii

S0049-3848(17)30340-7

journal_volume

156

pub_type

杂志文章

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