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Elisa D'Alessandro
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Lindsay Dong
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D’alessandro, E.;  Winters, J.;  Nieuwenhoven, F.A.V.;  Schotten, U.;  Verheule, S. The Complex Relation between Atrial Cardiomyopathy and Thrombogenesis. Encyclopedia. Available online: https://encyclopedia.pub/entry/37394 (accessed on 01 July 2024).
D’alessandro E,  Winters J,  Nieuwenhoven FAV,  Schotten U,  Verheule S. The Complex Relation between Atrial Cardiomyopathy and Thrombogenesis. Encyclopedia. Available at: https://encyclopedia.pub/entry/37394. Accessed July 01, 2024.
D’alessandro, Elisa, Joris Winters, Frans A. Van Nieuwenhoven, Ulrich Schotten, Sander Verheule. "The Complex Relation between Atrial Cardiomyopathy and Thrombogenesis" Encyclopedia, https://encyclopedia.pub/entry/37394 (accessed July 01, 2024).
D’alessandro, E.,  Winters, J.,  Nieuwenhoven, F.A.V.,  Schotten, U., & Verheule, S. (2022, November 30). The Complex Relation between Atrial Cardiomyopathy and Thrombogenesis. In Encyclopedia. https://encyclopedia.pub/entry/37394
D’alessandro, Elisa, et al. "The Complex Relation between Atrial Cardiomyopathy and Thrombogenesis." Encyclopedia. Web. 30 November, 2022.
The Complex Relation between Atrial Cardiomyopathy and Thrombogenesis
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This entry is adapted from the peer-reviewed paper 10.3390/cells11192963

Heart disease, as well as systemic metabolic alterations, can leave a ‘fingerprint’ of structural and functional changes in the atrial myocardium, leading to the onset of atrial cardiomyopathy. As demonstrated in various animal models, some of these changes, such as fibrosis, cardiomyocyte hypertrophy and fatty infiltration, can increase vulnerability to atrial fibrillation (AF), the most relevant manifestation of atrial cardiomyopathy in clinical practice. Atrial cardiomyopathy accompanying AF is associated with thromboembolic events, such as stroke. The interaction between AF and stroke appears to be far more complicated than initially believed. AF and stroke share many risk factors whose underlying pathological processes can reinforce the development and progression of both cardiovascular conditions. 

atrial cardiomyopathy atrial fibrillation thrombogenesis

1. Atrial Cardiomyopathy and Atrial Fibrillation

Atrial fibrillation (AF) is the most common sustained tachyarrhythmia in clinical practice. The prevalence of AF rises steeply with age [1]. It has long been recognized that the risk for AF is increased by underlying structural heart disease, including coronary artery disease, prior myocardial infarction, heart failure and valvular disease [1]. This led to the distinction between ‘AF with preexisting structural heart disease’ and ‘lone AF’, i.e., AF occurring in the absence of structural heart disease. However, many other non-cardiac disease factors also increase the likelihood of AF, e.g., obesity, sleep apnea, and hyperthyroidism, in the absence of clinically detectable changes in the cardiac structure or function [1][2]. For example, diabetes mellitus has been associated with an increased risk of developing AF. The mechanisms by which this metabolic disorder would lead to AF are still under debate. Growing evidence suggests the involvement of diabetes-related oxidative stress and inflammatory state [3]. Moreover, glucose and insulin disturbances are also associated with pathological changes in the heart, as suggested by the increase in the left ventricular mass accompanying the worsening of glucose intolerance [4].

In recent years, the term ‘atrial cardiomyopathy’ has been proposed to describe ‘any complex of structural, architectural, contractile or electrophysiological changes affecting the atria with the potential to produce clinically relevant manifestations’ [5]. In this view, many different pathologies, such as structural heart disease as well as systemic metabolic alterations, can lead to disease processes affecting the atrial myocardium, leaving a ‘fingerprint’ of structural and functional changes (Figure 1). Many of these alterations, e.g., fibrosis, myocyte hypertrophy, and fatty infiltration, can increase vulnerability to AF [6][7][8]. Initially, AF is characterized by atrial electrical remodeling followed by a much slower and irreversible process, which is structural remodeling. In fact, once AF develops, its rapid atrial rates and loss of organized contractility cause, among others, calcium overload, ischemia, oxidative stress, and stretch that further contribute to atrial electrical and structural changes [9][10][11][12]. In this context, AF can either exacerbate pre-existing remodeling processes or contribute to the new onset of pathological changes in the atria, becoming either the consequence or the cause of atrial cardiomyopathy.
/media/item_content/202212/6388658c4465ecells-11-02963-g001.png
Figure 1. Schematic representation of the relation between AF and atrial cardiomyopathy. Risk factors for AF lead to pathological structural and functional changes in the atria. These result in atrial cardiomyopathy of which AF is its most relevant clinical manifestation. Once AF develops, it supports and accelerates the ongoing pathological changes in the atria.

2. Atrial Cardiomyopathy and Thrombogenesis

Atrial cardiomyopathy accompanying AF is associated with thromboembolic events. AF patients show increased cardiovascular mortality due to sudden death, HF and stroke. The risk of developing thromboembolic stroke increases five-fold after patients have developed AF [1][13].
The pathogenesis of thrombus formation during AF is multifactorial and results from changes in physiological processes leading to aberrant blood flow/stasis in the fibrillating atria, endothelial dysfunction/changes in endothelial structure, and hypercoagulability [14]. These mechanisms lead to the fulfillment of Virchow’s triad and predispose patients to thrombogenic events within the atria (Figure 2) [15].
/media/item_content/202212/638865bcbd131cells-11-02963-g002.png
Figure 2. Atrial cardiomyopathy contributes to thrombogenesis. Unlike in the healthy atrium (left side), in the cardiomyopathic atrium (right side), pathological structural and functional changes (e.g., contractile dysfunction, atrial dilation, fibrosis, and fat infiltration) lead to aberrant blood flow and stasis in the atria cavity, endothelial dysfunction (and structural changes), and hypercoagulability, predisposing patients to thrombogenic events within the atrial cavity. Furthermore, hypoxic conditions, together with vascular leakage, may contribute to the activation of the coagulation cascade within the myocardial tissue. Abbreviations: NO = nitic oxide; vWF = von Willebrand factor; TF = tissue factor.

2.1. Blood Stasis and Endothelial Dysfunction

Atrial contractile remodeling leads to reduced and/or dyssynchronous atrial contraction and wall motion disturbances. This results in blood stasis, which critically contributes to thrombogenesis.
During the first days after AF onset, loss of synchronized atrial contraction goes hand in hand with electrical remodeling processes [16]. Interestingly, although electrical remodeling is reversible upon sinus rhythm (SR) restoration, the impairment of atrial contractility partially remains after the cardioversion to SR, increasing the risk of thrombus formation and stroke [17][18][19][20].
The loss of atrial contractility contributes to thrombogenesis via multiple other mechanisms. As recently demonstrated by Spartera and colleagues, a left atrial myopathic phenotype, including reduced left atrial function, is associated with altered left atrial flow characteristics in patients at moderate-to-high risk of stroke, regardless of a history of AF [21]. In fact, altered atrial flow velocity and vorticity are expected to reduce endocardial shear stress. This phenomenon has been shown to downregulate the endothelial production of nitric oxide, which mediates vasodilation and has anti-thrombotic properties [22]. The downregulation of atrial nitric oxide would, therefore, not only stimulate the aggregation of platelets, but also increase the expression of the protein plasminogen activator inhibitor-1 (PAI-1), resulting in impaired fibrinolysis [14]. Moreover, atrial contractile dysfunction has been associated with atrial dilation, which is an independent risk factor for thrombogenesis in patients with and without AF [23][24][25][26]. In fact, atrial dilation and volume overload of the left atrial appendage are associated with increased endocardial expression of the glycoprotein von Willebrand Factor (vWF), a well-documented marker of endothelial dysfunction [27][28][29]. vWF mediates platelet adhesion to the activated endothelium, and its plasma levels are an independent predictor of poor outcome, including thromboembolic events, in patients with AF [30].
The deterioration of endothelial function in atrial cardiomyopathy can also result from inflammatory processes. Systemic and local (atrial) inflammation is a well-documented phenomenon in AF [31][32]. Within the atria, inflammation leads to areas of endothelial denudation and predisposes patients to thrombotic aggregation [33]. The exposure of tissue factor (TF)-expressing subendothelium to the bloodstream, as a consequence of endothelial denudation, may facilitate the activation of the coagulation cascade within the atrial cavity [34]. Moreover, pro-inflammatory stimuli can directly support thrombotic events by upregulating the expression of vWF and TF in endothelial cells and monocytes [35][36].

2.2. Pro-Thrombotic Interstitial Changes

During the complex etiology of atrial cardiomyopathy, with a variety of molecular and structural changes taking place in the atrial tissue, pro-thrombotic and pro-inflammatory changes may also be observed within the interstitial space of the atrial myocardium itself (Figure 2). For example, the accumulation of epicardial adipose tissue (EAT) may play a role in the development of AF. Several studies have reported that EAT volume may represent an independent risk factor for AF development and a predictor of AF recurrence in patients undergoing AF ablation [37][38]. The exact role of EAT in AF development still requires clarification. As reported by Antonopoulos and colleagues, EAT may play a protective role in the heart by decreasing myocardial oxidative stress via the secretion of adiponectin [39].
Nevertheless, EAT is associated with fatty infiltration from the epicardial layer, which may cause disorganized conduction within the atria [40]. Moreover, both EAT and fatty infiltration are active sources of pro-inflammatory cytokines (e.g., monocyte chemoattractant protein-1 (MCP-1), Interleukin-6 (IL-6), and tumor necrotic factor-alpha (TNF-α), which can aggravate the effect of existing pro-inflammatory processes on the endocardial endothelium and support the infiltration of immune cells within the myocardium [7].

2.3. Hypercoagulability

Another mechanism that contributes to thrombogenesis in AF and in other atrial cardiomyopathies consists of alterations in blood constituents which confer a hypercoagulable state [41].
Hypercoagulability in AF patients is often reflected by increased systemic platelet activation, elevated concentrations of pro-thrombotic indices (e.g., prothrombin fragments 1 + 2 and thrombin–antithrombin complex) and altered fibrinolytic activity [14].
Interestingly, the activation of the coagulation system in AF may not be homogeneous throughout the body. Some studies have shown that platelet activation and thrombin generation markers were elevated in the atria of patients within minutes after AF induction, or as a consequence of rapid atrial pacing (RAP) in animal models, compared to peripheral circulation [42][43]. These data highlight the effect of rhythm and rate on atrial pro-thrombotic mechanisms (e.g., local endocardial dysfunction/damage), which may promote a local pro-thrombotic environment.
Nevertheless, it is still not fully clarified whether “lone AF” (AF in the absence of apparent comorbidities) is sufficient to cause a pro-thrombotic state, or whether the presence of other underlying comorbidities and risk factors is required.

3. Activation of Coagulation Supports Atrial Cardiomyopathy

Activated coagulation factors, such as thrombin and FXa, can modulate physiological and pathological processes, such as inflammation and fibrosis, which may contribute to atrial cardiomyopathy (Figure 3) [44][45]. These extravascular (non-hemostatic) functions impact different cell types (e.g., endothelial cells, cardiomyocytes and cardiac fibroblasts) via the activation of protease-activated receptors (PAR) [46]. The PAR family consists of four isoforms (PAR-1 to −4). Activated coagulation proteases, such as thrombin and FXa, cleave PAR at the N-terminus and generate an exposed N-tethered ligand that self-activates the receptor [47].
/media/item_content/202212/638865d83a950cells-11-02963-g003.png
Figure 3. Activation of coagulation promotes atrial cardiomyopathy. Activated coagulation factors, such as Thrombin and FXa, modulate cellular processes via the activation of PAR expressed on cardiac cells. These processes, such as inflammation, fibrosis and cellular hypertrophy, may contribute to the worsening of atrial cardiomyopathy. Abbreviations: PAR = protease-activated receptor; FXa = Factor × activated; IL6 = Interleukin 6; CCL2 = C-C motif ligand 2; NNPA = atrial natriuretic peptide.
Recently, hypercoagulability has been described to play a role in the progression of AF [48]. The in vivo inhibition of FXa attenuated AF-induced atrial endomysial fibrosis and reduced AF complexity in goats after four weeks of AF [48]. Several other studies have reported that the direct FXa inhibitor, rivaroxaban, attenuated cardiac fibrosis in various animal models of myocardial remodeling [49][50][51][52].
To understand the mechanisms responsible for these effects, scholars investigated the direct effect of activated coagulation factors, thrombin and FXa, on primary cardiac fibroblasts (CFs) [53]. In this study, thrombin and FXa lead to the increased expression of well-known pro-fibrotic genes (e.g., Alpha 2 smooth muscle actin and Transforming growth factor beta genes) in CFs. Furthermore, FXa upregulated the gene expression of two key regulators of inflammatory processes, CCL2 and IL6, in primary adult human atrial CFs. This effect was mainly caused by FXa-induced PAR-1 activation, which was the most abundant isoform in CFs. Moreover, in line with previous findings, the scholars provided evidence for the existence of a positive feedback loop of PAR expression upon their activation by these coagulation factors [48][53].

4. The Complex Association of AF and Thrombogenesis (Stroke)

In recent years, the interaction between AF and stroke has been shown to be far more complicated than initially believed. The traditional hypothesis was that AF causes a reduction in the blood flow velocity, activation of coagulation factors in the blood and endothelial remodeling that in combination explain the enhanced risk for stroke in patients with AF. This hypothesis explains the association between AF and stroke largely by monodirectional causation from comorbidities to AF, to the activation of coagulation factors and ultimately to stroke (Figure 4, left).
/media/item_content/202212/638865e9e883ecells-11-02963-g004.png
Figure 4. The complex association between AF and stroke. Monodirectional causation (left): various comorbidities lead to the onset of AF, followed by the activation of the coagulation system, and ultimately stroke. Multidirectional causation (right): atrial cardiomyopathy and hypercoagulability cause each other and share common pathophysiological pathways. These pathways, which may occur within and/or outside the atrial endothelium, can contribute to both proarrhythmic and prothrombotic mechanisms, resulting in the concomitant increased risk of AF and stroke.
 

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Subjects: Cardiac & Cardiovascular Systems
Contributors MDPI registered users' name will be linked to their SciProfiles pages. To register with us, please refer to https://encyclopedia.pub/register :
Elisa D’Alessandro
,
Joris Winters
,
Frans A. van Nieuwenhoven
,
Ulrich Schotten
,
Sander Verheule
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Entry Collection: Hypertension and Cardiovascular Diseases
Revisions: 2 times (View History)
Update Date: 01 Dec 2022
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