Rheumatoid arthritis as cardiovascular risk factor: an update

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Calin D. Popa1,2


1 Department of Rheumatology, Sint Maartenskliniek Nijmegen, Netherlands
2 Department of Rheumatology, Radboudumc Nijmegen, Netherlands


Abstract: Rheumatoid arthritis (RA) patients have a 1.5 – 2.5 higher chance to develop cardiovascular diseases (CVD), which in turn represent the most important cause of mortality and the most frequent comorbidity in these patients. Chronic infl ammation crucially contributes to that, either as an independent risk factor or as a modulator of traditional cardiovas-cular (CV) risk factors, such as dyslipidemia and hypertension. The cardiovascular risk management (CVRM) is therefore essential in these patients. The implementation of it in the daily practice is quite challenging and requires a good networking between different specialists (rheumatologist, cardiologist, internist) and the general practitioners (GPs), and may get vari-ous forms of organization depending on region and locations. Keywords: rheumatoid arthritis, inflammation, cardiovascular risk, cardiovascular diseases.

Rezumat: Pacienţii cu poliartrită reumatoidă au un risc de 1,5-2,5 ori mai mare pentru a dezvolta boli cardiovasculare, care la rândul lor reprezintă principala cauză de mortalitate şi principala comorbiditate la aceşti pacienţi. Inflamaţia cronică contribuie într-un mod esenţial la acest lucru, atât ca factor de risc independent cât şi prin modularea unor factori de risc tradiţionali, cum ar fi dislipidemia şi hipertensiunea arterială. Din aceste considerente, managementul riscului cardiovascular devine deosebit de important pentru aceşti pacienţi. Punerea lui în practica de zi cu zi este, însă, destul de complexă şi une-ori anevoioasă, având nevoie de o colaborare cât mai strânsă între diverşi specialişti (reumatologi, cardiologi, internisti) şi medicii de familie, cu posibilitatea realizării unor soluţii variate la nivel local, regional sau naţional. Cuvinte cheie: poliartrita reumatoidă, inflamaţie, risc cardiovascular, boli cardiovasculare.

INTRODUCTION

Rheumatoid arthritis (RA) is one of the most frequent chronic inflammatory diseases (1% from the general population). RA is characterized by a polyarthritis that usually involves the small joints of the hands and feet, but larger joints such as the knees and hips co-uld also be affected. Besides arthritis, other so called “extra-articular” manifestations can take place in RA, including rheumatic nodules, interstitial lung disease, subfebrile temperature or signs and symptoms rela-ted to other autoimmune disease RA can overlap with (Sjgören syndrome, vasculitis, myositis etc.). Rheumatoid arthritis (RA) is also known to asso-ciate often with other comorbidities, mainly due to the presence of the chronic autoimmune processes. Accordingly, RA patients have a higher risk to deve-lop various infections (parodontitis, urinary tract infections, gastro-enteritis, Epstein-Barr virus infection), malignancies (lymphoma’s, lung cancer) and cardiovas-cular diseases (CVD)1. The therapy of these patients using various immunosuppressive agents may have an important impact on the risk of comorbidities, either favoring their incidence (higher chance for infections for instance) or diminishing their chance of occurren-ce (lower risk of CVD). Cardiovascular diseases are the most frequent co-morbidity in RA patients and the main cause of death in this group of patients as well2. From this perspec-tive, the management of CVD in RA becomes equally important as the management of RA self and has furt-her a crucial impact on the prognosis and quality of life of these patients. Nevertheless, it is only in the last decades that CVD in RA have received more at-tention leading to the development of guidelines and recommendations in order to prevent their occurren-ce (cardiovascular risk management – CVRM). Des-pite an increasingly awareness of the increased CV risk in RA patients and the need to tackle this pro-blem, one can also observe that the implementation of this knowledge in the daily practice is still limited and suboptimal3. This article aims to shed more light in the factors contributing to the CVD in RA patients as well as to address the CVRM in these patients, insisting on the most important barriers for its implementation in the daily practice.

CARDIOVASCULAR DISEASES IN RA

The most important types of CVD in RA patients are presented in Figure 1. RA patients have a 1.5 to 2.5 higher risk to develop CVD than the age and gender matched individuals in the general population2. This increased risk is likely to be due to the presence of traditional CV risk factors as well as RA-related chro-nic inflammation. The total CV risk is therefore not entirely explained by traditional CV risk factors, whi-ch in turn suggests that RA acts as an independent risk factor for the development of CVD4. It has been previously indicated that RA and atherosclerosis have similar pathogenic pathways where different immune cells, adhesion molecules and pro-inflammatory cyto-kines play important roles. This pro-inflammatory sta-tus can accelerate the development and progression of atherosclerosis in RA patients5. Various studies have suggested that RA patients of-ten shown asymptomatic and/or subclinical cardiovas-cular diseases. Cardiac MRIs and PET-CTs in RA pati-ents with overt CVD have indicated in almost half of the situations that these patients have cardiac fibrosis and inflammation6. Moreover, a diastolic dysfunction of the left ventricle has been more often seen in RA patients, as assessed by the cardiac ultrasound exa-mination. Finally, there is an increased prevalence of pericarditis and valvular pathology in RA patients as compared to the general population, yet these cases are much lesser than those with atherosclerosis-dri-ven cardiac ailments7. The subclinical modifi cations in the heart of patients with RA are also present in the coronary microcircula-tion. One third of the RA patients without a history of CVD would develop a cardiac microvascular dysfunc-tion8. In addition, RA patients have higher prevalence, more severe and much more locations with coronary plaques, as assessed by CT-angiography6. Of note, the chance to develop a “still” myocardial infarction is two times higher in RA than in the general population. Fi-nally, the 30-days mortality after a myocardial infarc-tion is increased in RA patients: 18% in RA compared to 11% in the non-RA population9.

Figure 1. Cardiovascular diseases in rheumatoid arthritis.

Figure 2. The relation between inflammation and cardiovascular diseases in rheumatoid arthritis. (DMARDs = disease modifying anti-rheumatic drugs; NSAIDs = non-steroidal anti-inflammatory drugs; cIMT = carotid intima-media thickness; CAC = coronary artery calcification; DAS28 = dis-ease activity score 28; CRP = C-reactive protein; ESR = erythrocytes sedi-mentation rat; HDL = high-density lipoprotein; RA = rheumatoid arthritis).

2.1 Chronic inflammation

Inflammation has been previously demonstrated to play a crucial role in the development of atheroscle-rosis. Inflammatory markers, such as high-sensitive C-reactive protein (hs-CRP) are able to predict CV risk in the general population, independent of the traditio-nal CV risk factors. RA-driven inflammatory processes are able to trigger various pathways that contribute to the occurrence of major acute cardiovascular events (MACEs) in several patients (Figure 2). The serum concentration of CRP at diagnosis might also predict CV morbidity in RA. Active disease can increase the CV risk in RA, whereas remission and low-disease activity are associated with reduced CV risk10. Using a larger international cohort of more than 5000 RA patients, Crowson et al. shown that almost 30% of the total CV risk in RA patients could be attributed to disease-related factors11. Chronic inflammation contributes to and accelera-tes atherosclerosis in RA. Endothelial dysfunction, an early marker of atherosclerosis and a CVD predictor as well, is often indicated to be present in RA pati-ents5. Several studies have shown that the carotid inti-ma-media thickness (cIMT) is more often increased in RA patients as compared to age- and gender-matched individuals from the general population6. In addition, it is likely that the most of the plaques in RA presented markers of instability, which in turn is known to be associated with higher CV risk. Similar findings have been observed when the coronary system has been assessed using CT-angiography. Moreover, the unsta-ble plaques in the coronaries were often associated with high RA- disease activity6. Finally, infl ammation affects some traditional CV risk factors as well. Accordingly, insulin resistance in-creases when systemic inflammation rises, the meta-bolic syndrome and type-2 diabetes mellitus are more often seen in RA and patients with diabetes are known to bare a low-grade infl ammatory state at the adipose tissue level12. The relation between inflammation and lipoproteins is also assessed in RA patients. Conse-cutively, the concentration of the most lipoproteins decreases when chronic systemic inflammation incre-ases (high disease activity) and the other way around. Of note, the low lipid levels during periods with acti-ve inflammation are associated with a higher risk to develop CVD. This phenomenon is called “the lipid paradox”13. This has implications for the daily prac-tice and has led to the recommendation of assessing the CV risk in RA patients only during the periods of low-disease activity and/or remission. Besides the concentration, the composition of various lipoprote-ins could be influenced by the presence of inflamma-tion as well. Especially the HDL-cholesterol molecule changes during the periods with active inflammation14. HDL-cholesterol has a strong anti-atherogenic effect, due to the capacity of removing cholesterol from the arterial walls and transporting him to the liver (the so called reverse cholesterol transport –RCT) as well as due to its anti-oxidative capacity. Therefore, infl ammation is associated not only with lower HDL-cholesterol levels but also with a diminished RCT and anti-oxidative capacity as well. These pro-atherogenic effects are luckily reversible and could be normalized when RA is efficiently treated and low disease activity and/or remission is achieved15.

2.2 Traditional risk factors

The development of CVD is dependent on the pre-sence of several so-called “traditional” CV risk factors, such as age, gender, hypertension, hypercholesterole-mia, diabetes, smoking, obesity and physical (in)acti-vity. The prevalence of traditional CV risk factors in RA patients is often higher than in the general popula-tion16. Nevertheless, the higher CV risk in RA cannot be explained only by the presence of these factors11. Because RA is regarded as an independent CV risk factor, similar to diabetes, the traditional CV risk fac-tors in RA patients should get as much attention as in the case of diabetes patients. Yet, there is still a high number of RA patients in the daily practice who have a suboptimal therapy for their modifiable CV risk factors and even some who have no therapy at all, especially for dyslipidemia and hypertension3. In a recent study done in Great-Britain, Toms et al. shown that only 41% of RA patients having an indi-cation for therapy with statins according to their CV risk score were also treated with these drugs, leaving thus the majority of them -59%- not treated at all17. Later on, van den Oever et al. indicated in a Dutch population that 69% of the RA patients studied had an indication to start medication (anti-hypertensive and/ or cholesterol lowering therapy); of them, 42% were treated inadequately (meaning that they did not reach the target LDL-cholesterol and the target blood pre-ssure values) and 40% had no therapy at all3. In other words, only 18% received proper cardiovascular pre-vention. The authors concluded that failing to screen for the presence and the inadequate therapy of cardi-ovascular risk factors in RA patients would represent an important factor contributing to the increased CV morbidity and mortality reported in RA in the year 2020. Therefore, there is clearly more room for im-provement regarding this issue.

  1. CARDIOVASCULAR RISK MANAGEMENT (CVRM)

The European League against Rheumatism (EULAR) has published in 2017 its new recommendations for the CVD risk management for patients with rheuma-toid arthritis and other forms of inflammatory joint diseases18. There are a set of overarching principles formulated, one of which states that the increased risk to develop CVD may apply to patients with psoriatic arthritis (PsA) and ankylosing spondylitis (AS) as well. In addition, patients with gout are long ago known to bare higher CV risk, taking into account that these patients are often known with metabolic syndrome that in turn is associated with higher CV risk. Taken together, these facts give a strong signal that an opti-mal CV risk management (CVRM) should become a mandatory part of the therapeutic workout of every patient with one of these chronic inflammatory condi-tions. Unfortunately, there are still some obstacles to overcome, which make the implementation of CVRM for these patients difficult to accomplish in the daily practice.

3.1 Cardiovascular risk calculators

The identification of patients in the high-risk catego-ry forms the basis of a successful CVD prevention. In order to do that, CV risk calculators should be used, such as SCORE, Framingham or QRisk3. Yet, their use-fulness in RA patients is limited and could lead some-times to erroneous results: often an underestimation of the CV risk. One explanation for this could reside in the fact that the chronic inflammation in RA mi-ght accelerate the development of atherosclerosis and perhaps of the unstable plaques as well, which in turn might expedite the occurrence of an acute CV event. This might explain why young RA women have relati-vely higher rates of CV events, although their initially predicted risk was very low. This leads to a mismatch between the predicted and observed CV risk19. It is not known yet if the traditional CV risk factors should have another weight in RA as compared to no-RA po-pulation. The attempt to adapt the current algorithms to fit better RA population is not easy neither always possible20. Therefore, EULAR recommends the use of the 1.5 multiplying factor to the original SCORE result when calculating the risk in RA patients18. The 1.5 mul-tiplying factor seems arbitrary but very practical in the same time, as long as the development and validation of a good RA-specific CV risk algorithm is still missing. Finally, the present risk calculators are mainly used to quantify the CV risk for individuals aged between 40 and 70 years old. This might lead to problematic situations in the daily practice especially when rheu-matologists and/or GPs should give advise to patients younger than 40 years on the CVRM issues. Therefo-re, the present recommendation is to evaluate these cases on individual CV-risk level and formulate the most reasonably advice accordingly.

3.2 Lifestyle modification

It is very important to realize that in the most of the cases a good CVRM would be constrained to just the following of good lifestyle recommendations. Firstly, patients should give-up smoking. Of note, quitting smoking positively impacts the CV risk but might also improve RA prognosis as well21. Cigarette smoking is strongly associated with the development of RA (es-pecially in patients baring the shared-epitope) and may diminish the effects of therapy with TNF-alpha inhibi-tors as well22. Secondly, physical activity should be encouraged in patients with RA, not just for the positive effects on the aerobic capacity but also for the improvement of the muscles’ and joints’ pain of degenerative and/or tendomyogen origin, which often co-exist with the other RA-related symptoms in these patients. The impact of regular physical activity on CV risk in RA has been often underestimated and is not so good evaluated so far. The lower level of physical capacity in RA, due to the disease-related pain level, has been suggested to have an important contribution to the total CV risk in these patients23. It is therefore of cru-cial importance for both CV as well as RA outcomes to stimulate physical activity in every RA patient. Finally, overweight is often present in RA patients and crucially contributes to the development of hype-rinsulinemia and diabetes, which in turn favor the occurrence of CVD. The accumulation of fat in the adipocytes leads locally to a low-grade inflammatory status and systemically to an increased level of adipo-kines and cytokines (such as leptin, adiponectin, TNF etc), some of them with important pro-inflammato-ry effects24. Given the association between cartilage damage and overweight, these results suggests that loosing weight and a balanced diet would positively impact both CV risk as well as RA-symptoms. It is desirable that all these recommendations regarding lifestyle changes should be implemented as optimal as possible in the daily practice. This is yet dependent on local and national protocols and regulations. Ideally, this task might be assigned to the GPs or other specia-lized health care providers (e.g. physiotherapist, dieti-cian etc.), which could guide the patients referred also by the specialists based in hospitals (rheumatologists, cardiologists, internists, etc.).

3.3 Drugs’ therapy

As already mentioned above, lifestyle changes are suf-ficient to lower CV risk at the desired level in the most of the RA patients. Yet, in some of these patients therapy with drugs further needed in order to lower cholesterol and/or blood pressure levels at the target values. When looking at the cholesterol lowe-ring therapy in the context of RA, several aspects are important to be considered. Firstly, statins have been previously indicated to poses anti-inflammatory effects as well. In a double-blind placebo controlled study, therapy of RA patients with atorvastatin was followed by lower inflammatory status and disease activity as compared to placebo, whereas similar side-effects have been reported in both groups25. Secondly, the administration of atorvastatin to RA patients with overt CVD in a primary prevention setting has led to a lower incidence of CVD (1.6%) as compared to pla-cebo (2.4%): HR 0.66 (95% BI 0.39 – 1.11)26. This diffe-rence has not reached statistical significance, probably due to the fact that the study had to be terminated earlier than initially designed because of (insufficient) power issues (number incident CVD lower than initi-ally predicted). Finally, the hypothesis that hypercho-lesterolemia might actively be involved in the pathoge-nesis of RA and autoimmunity has been recently tes-ted and the results presented during the 2020 EULAR Congress27. This double-blind placebo controlled RCT (the STAPRA trial) investigated if daily administration of 40 mg atorvastatin could prevent the development of RA in a group of Dutch individuals with a high-risk for RA (namely pre-RA individuals with anti-CCP po-sitivity and joints pain without effusion – thus not yet arthritis). After a mean followed-up of 18 months, art-hritis seemed to occur earlier (4 months vs. 6 months) and more often (26% vs. 19%) in the placebo group as compared with atorvastatin users. Unfortunately, also in this study the authors confronted themselves with a lack of power, as they failed to reach the initially planed number of individuals that have to be included. Therefore, the differences between the groups lack statistical significance. Despite the fact that the anti-inflammatory effects of statins are reasonably proved so far, their additional value in RA is still arguable by patients who benefit from an optimal anti-rheumatic therapy (using DMARDs) and have an adequate lifes-tyle. In this light, it is worth mentioning that statins may also have some side-effects including muscle pain and could be diabetogenic, both of important in the context of CVD and RA. With respect to anti-hypertensive medication, it is worth mentioning perhaps that in the eighties there were a number of studies investigating the anti-rheu-matic effects of angiotensin converting enzyme (ACE) inhibitors. These studies have been recently reviewed by our group28 and suggest that especially captopril bared important anti-infl ammatory effects, most pro-bably due to its similarities with D-penicillamine, a well-known anti-inflammatory drug. Of note, although AT-2 antagonists (ARBs) have not been directly inves-tigated so far in the context of RA, they might theore-tically have beneficial anti-inflammatory effects in this group of patients. This could be due to the ARBs bloc-kade of multiple pro-inflammatory effects that follow after stimulation of AT-2 type I receptor, including higher pro-inflammatory cytokines production, activa-tion of T-helper1 (Th1) and Th17 cells, suppression of T regulatory (Treg) cells, activation of monocytes and dendritic cells etc29. Future studies are needed to further test hypothesis. Until that time, based on the present literature data, one can cautiously advise the preferential use of ARBs and/or ACEi as first line anti-hypertensive therapy in patients with RA and conco-mitant hypertensive. Finally, one should not forget to consider the CV impact of various anti-rheumatic medications. Long-term therapy with high dosages of corticosteroids and/or the most of the non-steroid anti-inflammatory drugs (NSAIDs) is usually followed by an increased risk to develop CV events. Naproxen and more recently celecoxib30 are likely to have a better CV profile, but caution should be taken also when RA patients are using these drugs and as a general rule, their use sho-uld be limited to on demand practice. On the other hand, the use of disease modifying anti-rheumatic drugs (DMARDs) is mostly associated with a favorable effect on CVD. Therapy with DMARDs lowers syste-mic inflammation and improves the anti-atherogenic capacity of HDL-cholesterol10,15. When RA patients achieve remission, the dosage of DMARDs is tapered in an attempt to reduce the chance of side-effects (e.g. infections) as well as to decrease the costs. Of note, the influence DMARDs tapering would have on CVD endpoints is not known yet and this crucial question should be further investigated in future studies.

3.4 Implementation of CVRM

The EULAR recommendations for CVRM in RA pa-tients and patients with other inflammatory joint di-sorders stipulate in one of the overarching principles that the rheumatologist should be responsible for the initiation of CVRM in these patients18. However, the rheumatologist alone can not be responsible for the whole CVRM, as some patients would require drug therapy in order to lower their cholesterol and/or blood pressure levels, treatments that do not belong to the area of expertise of rheumatologists. Therefo-re, it is important to realize that CVRM by rheumatic patients needs a multi-disciplinary approach, involving all other medical specialists dealing with different as-pects of CVRM, including cardiologists, internists and GPs. In addition, RA patients should be also appropri-ately informed over the various aspects of cardiovas-cular aspects in their disease, the importance of both lifestyle changes as well as of keeping their disease ac-tivity and inflammation as low as possible by appropri-ately using their anti-rheumatic medication. Screening for CV risk factors shoul31. The measurement of total cholesterol and blood pressure should be performed during a period of lower disease activity and low syste-mic inflammation to avoid the lipid paradox and thus an underestimation of the 10-year CV risk. Screening for asymptomatic atherosclerotic plaques by use of carotid ultrasound of coronary artery calcium scores (using computed tomography) may be considered as part of risk evaluation in patients with RA, especially in those categorized as having a low/intermediate risk according to the SCORE algorithm. Organizing CVRM for RA patients is quite complex. Several factors might play an important role in deter-mining which way would help the most in order to achieve the best result, namely a signifi cant decrease of CV risk in these patients, translated into a signifi-cant decrease in incident acute CV events, lower costs in the healthcare system32 and better prognosis. These factors are likely to be population and/or country-spe-cific factors such as socio-economic status, national health care policies and reimbursements regulations. In the Netherlands several models are already imple-mented in the daily practice. In some regions patients are screened by a rheumatologist on the outpatient clinic, yet the follow-up would take place in the ge-neral practitioner’s (GP) office3. In other places the GPs are fully responsible for the CVRM, the only task for the rheumatologist is to ask the GP to ini-tiate CVRM33. The fi rst Dutch model is similar with the model recently presented by Primdahl et al in a Danish population34. Interestingly, in Oslo, Norway, a cardio-rheuma clinic has been established in which cardiologists coordinate both processes of screening as well as follow-up until patients lower their CV risk factors to the target values and are thereafter referred to their GPs35. This approach might give some advan-tages by securing adequate therapy, yet organizing and financing such clinics might remain elusive for many rheumatologic centers worldwide.

  1. CONCLUSION

Rheumatoid arthritis is an independent CV risk factor and the higher CVD burden in these patients is likely to be due to both traditional CV risk factors as well as RA/inflammation-related factors. Early initiation of the anti-rheumatic therapy following the treat-to-target (T2T) protocols, together with appropriate lifestyle changes are able to considerably decrease the CV-risk in a large majority of these patients. Nevertheless, some high CV-risk patients would need to be treated with cholesterol lowering and/or anti-hypertensive drugs. The initiation and follow-up of the therapy with these drugs should be the task of a GP, cardiologist or internist. Therefore, CVRM in RA needs a multi-disci-plinary approach, with local solutions emerging some-times as the best serving the scope. The later should remain decreasing CVD in RAs, therefore improving the prognosis and the quality of life for these patients with a lifetime chronic disorder.

 

Conflict of interest: none declared.

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