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Role of the lymphatic vasculature in cardiovascular medicine

Niklas Telinius, Vibeke Elisabeth Hjortdal
Heart: Official Journal of the British Cardiac Society 2019 October 4
31585946
The lymphatic vasculature has traditionally been considered important for removal of excessive fluid from the interstitial space, absorption of fat from the intestine and the immune system. Advances in molecular medicine and imaging have provided us with new tools to study the lymphatics. This has revealed that the vessels are actively involved in regulation of immune cell trafficking and inflammation. We now know much about how new lymphatic vessels are created (lymphangiogenesis) and that this is important in, for example, wound healing and tissue repair. The best characterised pathway for lymphangiogenesis is the vascular endothelial growth factor C (VEGF-C)/VEGFR3 pathway. Over recent years, there has been an increasing interest in the role of the lymphatics in cardiovascular medicine. Preclinical studies have shown that lymphangiogenesis and immune cell trafficking play a role in cardiovascular conditions such as atherosclerosis, recovery after myocardial infarction and rejection of cardiac allografts. Targeting the VEGF-C/VEGFR3 pathway can be beneficial in these conditions. The clinical spectrum of lymphatic abnormalities and lymphoedema is wide and overlaps with congenital heart disease. Important long-term complications to the Fontan circulation involves the lymphatics. New and improved imaging modalities has improved our understanding and management of these patients. Lymphatic leaks and flow abnormalities can be successfully treated, minimally invasively, with percutaneous embolisation. Future research will prove if the preclinical findings that point to a role of the lymphatics in several cardiovascular conditions will result in new treatment options.

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