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Thrombotic Complications

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Thrombotic Complications CARDIOLOGY HEART FAILURE Thrombotic complications Prof James Ker, Senior Lecturer, Department of Internal Medicine, University of Pretoria There have been significant advances in the treatment of heart failure (HF) with a reduction in mortality. Despite this improvement in mortality, HF still has a bad prognosis and research is ongoing to find ways to improve the prognosis. Accumulating evidence indicate that Thrombus formation thrombotic complications may play a major role in morbidity and outcomes in patients Unstable plaque formation with HF. There are two major sources of Artery lumen Erthrocyte Fibrous cap Thrombus thrombosis in HF. Monocyte migrates Fibrin into the tunica intima The one important source is atrial Endothelium Low density Platelets fibrillation (AF) that is common in HF lipoprotein (LDL) Plaque rupture and the role of oral anticoagulation is Foam cell Core Tunica intima well established in AF, but the role of Low density lipoprotein Foam cell dies (LDL) oxidises anticoagulation is less well established in HF releases lipid debris Macrophage Smooth muscle cell uptakes oxidised LDL without AF. The other source of thrombosis in Macrophage uptakes HF is venous thromboembolism (VTE). oxidised LDL Tunica media Internal elastic Hospitalised HF patients have an lamina increased risk of VTE as a result of vascular Macrophage Foam cell Lymphocyte Smooth muscle Migration of transforms into dies releases cell transforms smooth muscle abnormalities, increased coagulability and Damaged heart muscle the foam cell lipid debris into the foam cell cells impaired blood flow. Endothelial damage and dysfunction is well documented in HF and is considered a hallmark of HF with severity increasing with severity of HF. en Venous dysfunction has also been um l ry Artery lumen e t r A Normal artery Stable (fibrous) plaque Unstable plaque formation formation described in HF and together with stasis a greater incidence of VTE up to day 10 and of venous blood in oedematous legs sets day 30 in hospital. This study also showed the stage for thrombosis. The incidence of that this link between the severity of HF and VTE in these patients is reported to be as the risk of VTE may be disrupted with oral high as 26% especially in those patients with anticoagulants (rivaroxaban). decompensated HF. Should we consider the use of oral It has also been shown that HF increases anticoagulants in patients with severe HF? the risk of pulmonary embolism (PE) that is not associated with deep vein thrombosis. The REFERENCES contribution of VTE towards overall mortality in Haas S. Venous thromboembolism in medical HF is not minor. It has been shown in a meta- patients: the scope of the problem. Semin analysis that one in five deaths occur in HF Thromb Hemost 2003; 29 (Suppl. 1: 17-21. patients on angiotensin-converting-enzyme Shantsila E, Lip GYH. Thrombotic complications inhibitors. Indeed, post-mortem studies show in Heart Failure: an underappreciated that PE can occur in about 30% of patients challenge. Circulation 2014; 130: 387-389. with HF. However the relationship between HF Sorensen HT et al. Heart disease may be a severity and VTE is not well established. risk factor for pulmonary embolism without peripheral deep venous thrombosis. NEW STUDY Circulation 2011; 124: 1435-1441. In this study, the MAGELLAN study, with 2593 Garg R et al. Overview of randomized trials of HF patients, New York Stage 111 or 1V, were ACE-inhibitors on mortality and morbidity in evaluated for VTE. The results of this study patients with heart failure. JAMA 1995; 273: showed that the more severe HF patients had 1450-1456. SF 28 September 2015 The Specialist Forum Vol. 15 No. 8.
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