Thromb Haemost 2020; 120(04): 579-591
DOI: 10.1055/s-0040-1702224
Review Article
Georg Thieme Verlag KG Stuttgart · New York

Effects of Obesity Surgery on Blood Coagulation and Fibrinolysis: A Literature Review

Else Marie Bladbjerg
1   Department of Clinical Biochemistry, Unit for Thrombosis Research, University Hospital of Southern Denmark, Esbjerg, Denmark
2   Institute of Regional Health Research, University of Southern Denmark, Denmark
,
Charlotte Røn Stolberg
2   Institute of Regional Health Research, University of Southern Denmark, Denmark
3   Department of Medicine, Section of Endocrinology, University Hospital of Southern Denmark, Esbjerg, Denmark
,
Claus Bogh Juhl
2   Institute of Regional Health Research, University of Southern Denmark, Denmark
3   Department of Medicine, Section of Endocrinology, University Hospital of Southern Denmark, Esbjerg, Denmark
› Author Affiliations
Further Information

Publication History

21 October 2019

09 January 2020

Publication Date:
14 April 2020 (online)

Abstract

Objective Obesity is characterized by a disturbed hemostatic balance with increased coagulation and impaired fibrinolysis. This increases the risk of thrombosis, and the risk is lowered after obesity surgery. Over the past 25 years, several studies have contributed to understand the mechanisms behind the antithrombotic effect of obesity surgery, and this literature review summarizes the results of these studies.

Methods A detailed literature search on the effects of obesity surgery on the hemostatic balance was conducted.

Results The 25 relevant studies reviewed demonstrated that obesity surgery has favorable effects on many biomarkers of coagulation and fibrinolysis. The evidence is substantial for fibrinogen and plasminogen activator inhibitor type 1 with average reductions from 1 to 24 months after obesity surgery of 17 and 48%, respectively. For most other biomarkers, the evidence is moderate or weak with average effect sizes varying from 2% for fiber mass length ratio to 70% for prothrombin fragment 1 + 2 and with a large variation between studies. Many studies are small and of short duration, and the surgical techniques differ. Also, studies are confounded by changes in medication, comorbidity, diet, and exercise. It is unknown whether the hemostatic changes are mediated by weight loss alone or by the accompanying metabolic improvements.

Conclusion Despite issues of confounding, this review suggests that obesity surgery shifts the hemostatic balance in the antithrombotic direction, thereby reducing the thrombotic potential of people with obesity, but more studies are needed for most of the biomarkers.

 
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