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ORIGINAL ARTICLE
Year : 2006  |  Volume : 52  |  Issue : 1  |  Page : 5-10

Cardiovascular involvement in systemic lupus erythematosus: An autopsy study of 27 patients in India


Department of Pathology, Seth G. S. Medical College and K.E.M. Hospital, Parel, Mumbai-400012, India

Correspondence Address:
Smita Divate
Department of Pathology, Seth G. S. Medical College and K.E.M. Hospital, Parel, Mumbai-400012
India
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Source of Support: None, Conflict of Interest: None


PMID: 16534157

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 :: Abstract 

Background: Although cardiovascular disease (CVD) is recognized as a leading cause of death in patients with systemic lupus erythematosus (SLE) in western countries, there is hardly any data regarding Indian subjects with SLE. Aims: To determine the incidence of cardiac abnormalities and vascular lesions at autopsy and to assess their contribution to the mortality in patients with SLE Settings and Design: Retrospective retrieval of reports of autopsies performed on 35 patients with SLE over a 11 year period and analysis of 27 cases with cardiac and/or vascular lesions. Materials and Methods: Gross and microscopic features in 27 autopsies were analyzed with special attention to the heart and the vasculature of all organs. Findings were correlated with clinical features and ante-mortem investigations. Their contribution towards mortality was assessed. Results: Valvar lesions were the commonest cardiac lesions noted with non-bacterial thrombotic endocarditis in nine (33.33%), valvar thickening in two (7.41%), Libman-Sacks endocarditis and infective endocarditis in one (3.70%) each. Myocarditis and myocardial scarring were seen in 10 (37.03%) and seven (25.92%) cases, respectively. Fibrinous pericarditis was noted in seven (25.92%). Thromboses/ embolism, vasculitis and severe coronary atherosclerosis were seen in nine (33.33%), five (18.52%) and one (3.70%) subjects, respectively. Renal disease [13, 48.14%] and cardiovascular manifestations [8, 29.62%] were the leading causes of death in our patient population. Conclusion: CVD contributes significantly to the mortality in patients with SLE in India. It is second only to renal disease in this regard


Keywords: Systemic lupus erythematosus, cardiovascular, autopsy, mortality


How to cite this article:
Panchal L, Divate S, Vaideeswar P, Pandit S P. Cardiovascular involvement in systemic lupus erythematosus: An autopsy study of 27 patients in India. J Postgrad Med 2006;52:5-10

How to cite this URL:
Panchal L, Divate S, Vaideeswar P, Pandit S P. Cardiovascular involvement in systemic lupus erythematosus: An autopsy study of 27 patients in India. J Postgrad Med [serial online] 2006 [cited 2019 Nov 18];52:5-10. Available from: http://www.jpgmonline.com/text.asp?2006/52/1/5/21640


Recently published studies from the western countries indicate that cardiovascular disease (CVD) is a major cause of death in patients with systemic lupus erythematosus (SLE).[1],[2],[3] However, the data in different Indian studies is conflicting and the importance of CVD in SLE is not clear.[4],[5],[6],[7] This striking contrast prompted us to review autopsy reports of patients with SLE who were admitted in our hospital to assess the incidence of cardiovascular lesions and their contribution to mortality.


 :: Materials and Methods Top


At our center, autopsies are routinely performed to ascertain the cause of death. We retrospectively reviewed the autopsy findings of all cases of SLE who had died over a 11 year period (1991-2001).The diagnosis of SLE was made on the basis of clinical features and laboratory data in accordance with the revised criteria for the classification of SLE.[8] Thirty five autopsies [28 females, 7 males; patient age range: 10-69 years, Mean age 24.14 years, SEM 1.64] were performed in subjects with SLE accounting for 0.20% of 17741 autopsies performed during the period. Amongst these, 27 patients (77.14%) who showed cardiovascular lesions at autopsy, were selected for the present study.

Patients' medical records maintained by the hospital were retrieved. The documented clinical data, including details of the complete haemogram and biochemical and serological tests [including tests for antinuclear antibody (ANA), anti-double stranded deoxyribonucleic acid (anti-ds-DNA), anticardiolipin antibody (ACLA) and other prothrombotic markers] were reviewed. In addition, findings noted in autopsy reports were also reviewed and recorded. At the autopsy, the heart chambers were regularly examined for pathological changes in the pericardium, atria, ventricles, valves, ostia and all branches of coronary arteries, aorta and its branches, pulmonary artery and its branches. The chambers were studied with respect to chamber size and appearance of the endocardium and myocardium. All parts of the valvar apparatus of the atrio-ventricular and semilunar valves were carefully inspected. Paraffin sections of the myocardium, valves and coronary arteries were stained with haematoxylin-eosin (HE) and elastic van Gieson (EVG). In addition, the vasculature of all organs was examined for atherosclerosis, thrombosis, vasculitis or any other change. The primary cause of death was attributed, with appropriate clinical and laboratory correlation, to the organ/ system showing the most florid pathological lesions.


 :: Results Top


All the 27 SLE patients [22 females, 5 males] with cardiovascular involvement at autopsy were young [Age range: 10-38 years, mean 23.29, S.E.M. 1.50]. All patients were on treatment with corticosteroids, however details of duration of therapy or dosages were not available. Sixteen (59.26%) patients had clinical records of ANA and/or anti-ds-DNA with ANA titers ranging from 1:40 to 1:160. ACLA was tested for in five (18.52%) patients and was positive in only one (3.70%). The chief clinical manifestations at the time of last admission of these patients and the cardiac and/or vascular lesions seen in individual patients are shown in [Table - 1]. A noteworthy fact was that though cardiovascular involvement was detected at autopsy in 27 patients, this involvement was clinically suspected or identified by ultrasonography or colour doppler in only six (22.22%) subjects ante-mortem. These comprised pericardial effusion in three (11.11%) and mitral and tricuspid regurgitation, mitral valve thickening and mitral regurgitation (MR) with a small vegetation in one patient (3.70%) each respectively.

Valvar lesions were seen at autopsy in 13 (48.15%) patients [Table - 1]. Multiple, tiny, tan-colored, warty vegetations of non-bacterial thrombotic endocarditis (NBTE) were seen along the lines of closure of the mitral valve [Figure - 1] in eight (29.62%) patients and on the mitral and aortic valves in one (3.70%). Three (11.11%) patients of NBTE of the mitral valve had other associated valvar abnormalities. These comprised mitral and tricuspid regurgitation, mitral regurgitation and stenosis with aortic stenosis and mitral valve thickening in one (3.70%) patient each. The stenosed mitral valve showed mild commissural fusion, fibrous thickening of the valve leaflets and mild sub-valvar changes. Classical lesions of Libman-Sacks endocarditis (LSE) were seen in only one case (3.70%). Infective endocarditis of the aortic valve was noted in one (3.70%) case. Non-specific thickening of the mitral valve leaflets, without NBTE was seen in two (7.41%) other patients, though it had been clinically detected in only one (3.70%). In one of these patients (3.70%) the mitral valve thickening was associated with a perimembranous ventricular septal defect and a bicuspid aortic valve.

As shown in [Table - 1], the spectrum of myocardial lesions included myocarditis, scarring and hypertrophy. Myocardial scarring [7 patients, 25.92%] was thought to be possibly ischemic in origin as six (22.22%) of them had a variety of coronary lesions. Multiple thrombi in the coronary arteries were seen in one (3.70%) 14 years old female patient; she had presented with acute respiratory distress. Coronary lesions seen in the other five included critical, greater than 90%, atherosclerotic narrowing of the left anterior descending coronary artery [Figure - 2] in an 18 years old female, thrombosis of the intra-myocardial coronary arteries in a 24 years old male subject, moderate fibro-cellular intimal thickening with medial hypertrophy of the intra-myocardial coronaries in a 24 years old female, coronary arteritis in a female aged 35 years and emboli in the intra-myocardial coronaries in a 29 years female with bi-ventricular mural thrombi [Figure - 3]. The myocardial fibrosis was streaky and interstitial in these five patients. Two of them had come with acute respiratory distress and died soon thereafter. The seventh, a 22 years old male, who had streaky myocardial scarring showed normal coronary arteries. But, thrombotic micro-angiopathy (TMA) seen in the kidneys suggested a probable thrombotic cause for the fibrosis. Myocardial hypertrophy was seen in five cases [Table - 1]. Left ventricular hypertrophy that could be attributed to systemic hypertension was seen in four cases with hearts weighing 240-600 gm, The right ventricular hypertrophy noted in one of the hearts was probably due to diffuse interstitial lung disease with resultant pulmonary hypertension. A patchy mild to moderate, lymphocytic myocarditis was seen in nine (33.33%) patients and the patient with infective endocarditis of the aortic valve had a neutrophilic myocarditis (3.70%).

Fibrinous pericarditis with or without effusion was seen in seven (25.92%) patients. Pericardial effusion alone was seen in three (11.11%) other patients.

Vascuiltides were seen in five (18.52%) patients [Table - 1]. Pulmonary vasculitis was seen in one (3.7%) patient while systemic vasculitides were seen in another four (14.81%). The latter involved the intra-renal vessels [Figure - 4], coronary, mesenteric and ovarian vessels. Venous or arterial thromboses were seen in nine (33.33%) patients [Table - 1]; tests for ACLA were done in only three (11.11%) of these patients. Thrombosis involved the intra-pulmonary vessels [Figure - 5] in six (22.2%) patients. Of these, one (3.70%) each, had thrombosis of the coronary artery and cerebral vein. The latter was a diagnosed case of thrombotic thrombocytopenic purpura (TTP). Interestingly, one patient (3.70%) who died following acute pancreatitis showed thrombosis of bilateral renal veins, inferior vena cava and superior pulmonary vein. and another, a 19 years old, female, who had presented with breathlessness and edema feet but subsequently developed altered sensorium with cortical venous thrombosis showed multiple cerebral and cerebellar infarcts. This latter patient was ACLA positive. Coronary atherosclerosis was uncommon (3.70%); only one 18 years, female, had significant, greater than 90%, atherosclerotic narrowing of the left anterior descending artery. The right coronary artery in this patient showed only mild concentric fibrous intimal thickening.

All the 27 patients with cardiovascular lesions at autopsy showed concomitant lesions in the renal and/or pulmonary parenchyma [Table - 1]. Multi-organ involvement with disorders in the cardiovascular, renal and pulmonary systems was the commonest; seen in 16 (59.26%) patients. One amongst these also had lesions in the pancreas. Only renal lesions were seen in ten (37.03%) while one (3.70%) had pulmonary and cerebral disease [Table - 1].

Amongst patients with a renal disease, lupus nephritis was seen in nineteen (70.37%) patients and end-stage renal disease in five (18.52%), while two (7.41%) other patients had acute and chronic pyelonephritis respectively. Pulmonary lesions in the 17 (62.96%) patients comprised of bronchopneumonia in seven (25.92%), tuberculosis in two (7.41%), interstitial lung disease in five (18.52%) and intra-alveolar haemorrhage in three (11.11%).

Only one (3.70%) patient, who had seizures and altered sensorium with cortical venous thrombosis revealed multiple brain infarcts. No organic brain pathology was seen at autopsy in the other three (11.11%) patients. One (3.70%) of these patients who had been thrombolysed for dural sinus thrombosis had developed acute respiratory distress terminally and had shown acute lupus pneumonitis at autopsy. The seizures in the two (7.41%) other patients may have been due to uraemic encephalopathy subsequent to acute pyelonephritis and lupus nephritis with renal TMA respectively. The 11 year old, female, [Table - 1] who presented with neuropsychiatric manifestations suggestive of central nervous system vasculitis and features of pseudo-bulbar palsy showed only a mild, patchy sub-arachnoid haemorrhage at autopsy while the pathological lesions seen were lupus nephritis and pulmonary edema with mitral valve thickening.

Involvement of other systems was the main cause of death in 19 (70.37%) patients, however, as seen in [Table - 1], cardiovascular lesions were significant enough to be the primary cause of death in eight of the 27 patients (29.62%). Majority, i.e. six (22.22%) were thrombotic manifestations that had resulted in myocardial ischemia in three (11.11%), pulmonary thromboembolism (PTE) in two (7.41%) and multiple brain infarcts in one (3.70%). In another 14 (51.85%) patients cardiovascular lesions like myocarditis, PTE, coronary artery disease (CAD), renal vasculitis and TMA could have contributed towards mortality, albeit as secondary factors.


 :: Discussion Top


Although CVD is the third leading cause of death in SLE in western countries,[9] its contribution to mortality in Indian subjects with the same disease has not been uniformly highlighted in various clinical studies.[6],[7],[10] However, autopsy analyses have been more successful in this respect. The importance of CVD as a primary cause of death has been noted in two clinical reports where autopsies were performed in a proportion of the cases.[5],[11] Our autopsy study observed CVD to be important factors contributing to mortality. Nevertheless, renal disease is the leading cause of death in SLE patients in India; as seen in our and other studies.[6],[7]

Thrombotic and atherosclerotic diseases are the commonest cardiovascular causes of mortality in SLE in western countries.[2],[3],[9],[12] The incidence of thromboses in our study is comparable with observations by Cervera et al .[2] Thromboembolism was also seen in a similar proportion of cases in the only other autopsy series in Indian patients with SLE.[4] However this study does not explain why thromboembolism was not considered to be a cause of death. SLE patients in western countries are noted to have a high risk for atherosclerotic CVD.[13] However, coronary atherosclerosis was strikingly uncommon in our study, possibly due to the younger ages of our patients. Coronary atherosclerosis was also not noted in the other autopsy study of Indian patients with SLE.[4] Nevertheless, CAD has been reported in young SLE patients.[14],[15] Our patient with coronary atherosclerosis was a young 18 years old, female. Between 14-69% of SLE patients may have hypertension; renal failure and steroid therapy are proposed as the precipitating factors.[16] In our study, all patients with hypertension had renal disease and were on steroid therapy.

NBTE was clinically significant in only few patients in our study, however steroid therapy implicated in healing of NBTE and the resultant fibrosis may have contributed to the observed mitral valve abnormalities.[17] While NBTE was common in our study, classical LSE was rare and we wonder whether the former was due to SLE related hypercoagulability rather than immune complex deposition.[18],[19] Myocarditis is often subclinical in SLE but has a higher autopsy incidence.[16] It was not diagnosed clinically in any of our patients. Lupus myocarditis is reported to be a poor prognostic factor.[20] In our study it may have contributed as a secondary factor towards death. Pericarditis is common in SLE at autopsy.[16],[21] The incidence in our study is comparable to observations by Jindal et al .[4]

A necrotising vasculitis can affect various viscera in SLE.[22] However a lower incidence of coronary arteritis was noted in our study and by Jindal et al as compared to the findings of Doherty et al .[4],[16] Vasculitis in SLE is associated with increased mortality.[23] It was the cause of death in our patient with coronary arteritis. TTP usually presents with renal TMA in SLE.[24] Our patient with TTP, interestingly, had no renal manifestations or lesions.

CVD may be subclinical in SLE.[12],[16] In our study only 22.22% of patients had a clinically diagnosed cardiac abnormality. However the presence of lupus nephritis may mask involvement of other organ systems and the latter may thus remain undetected.

Only a proportion of SLE related deaths were autopsied in our study, thus selection bias could have influenced our findings and these may not accurately represent the picture in the general SLE population in India. Furthermore, while retrospective analyses yield important and substantial information, particularly when autopsy-based, the implications of the inherent limitations of retrospective studies also need to be considered. Nevertheless, autopsy analyses are powerful tools that provide morphological evidence of organ involvement that may be lacking in clinical studies.

Our study suggests that CVD is an important contributor to mortality in SLE patients in India. In addition, it highlights the need for appropriate laboratory and radiological investigations, in view of the high incidence of thromboembolism coupled with the potential risk of atherosclerosis. CVD in SLE may be under-recognized in India. Further studies are needed to determine whether greater attention to the cardiovascular system and an increased use of relevant investigative modalities would reveal a higher incidence of CVD in clinical mortality studies in SLE patients in India.

 
 :: References Top

1.Bjornadal L, Yin L, Granath F, Klareskog L, Ekbom A. Cardiovascular disease a hazard despite improved prognosis in patients with systemic lupus erythematosus: results from a Swedish population based study 1964-1995. J Rheumatol 2004;31:713-9.  Back to cited text no. 1  [PUBMED]  [FULLTEXT]
2.Cervera R, Khamashta MA, Font J, Sebastiani GD, Gil A, Lavilla P, et al . Morbidity and mortality in systemic lupus erythematosus during a 10-year period: a comparison of early and late manifestations in a cohort of 1,000 patients. Medicine (Baltimore) 2003;82:299-308.   Back to cited text no. 2    
3.Ruiz-Irastorza G, Egurbide MV, Ugalde J, Aguirre C. High impact of antiphospholipid syndrome on irreversible organ damage and survival of patients with systemic lupus erythematosus. Arch Intern Med 2004;164:77-82.  Back to cited text no. 3  [PUBMED]  [FULLTEXT]
4.Jindal B, Joshi K, Radotra BD, Banerjee AK. Fatal complications of systemic lupus erythematosus- an autopsy study from north India. Indian J Pathol Microbiol 2000;43:311-7.   Back to cited text no. 4  [PUBMED]  [FULLTEXT]
5.Singh S, Devidayal, Kumar L, Joshi K. Mortality patterns in childhood lupus-10 years experience in a developing country. Clin Rheumatol 2002;21:462-5.  Back to cited text no. 5  [PUBMED]  [FULLTEXT]
6.Malaviya AN, Chandrasekaran AN, Kumar A, Shamar PN. Systemic lupus erythematosus in India. Lupus 1997;6:690-700.   Back to cited text no. 6  [PUBMED]  [FULLTEXT]
7.Murali R, Jeyaseelan L, Rajaratnam S, John L, Ganesh A. Systemic lupus erythematosus in Indian patients:prognosis, survival and life expectancy. Natl Med J India 1997;10:159-64.   Back to cited text no. 7  [PUBMED]  [FULLTEXT]
8.Tan EM, Cohen AS, Fries JF, Masi AT, McShane DJ, Rothfield NF, et al . The 1982 revised criteria for the classification of systemic lupus erythematosus. Arthritis Rheum 1982;25:1271-7.  Back to cited text no. 8    
9.Trager J, Ward MM. Mortality and causes of death in systemic lupus erythematosus. Curr Opin Rheumatol 2001;13:345-51.  Back to cited text no. 9  [PUBMED]  [FULLTEXT]
10.Chandrasekaran AN, Rajendran CP, Ramakrishnan S, Madhavan R, Parthiban M. Childhood systemic lupus erythematosus in south India. Indian J Pediatr 1994;61:223-9.  Back to cited text no. 10    
11.Gupta A, Singh S, Minz RW, Radotra BD, Ahluwalia J, Grover A. Lupus myocarditis in children. Ann Rheum Dis 2004;63:745-6.  Back to cited text no. 11  [PUBMED]  [FULLTEXT]
12.Ahmad Y, Bruce IN. Subclinical atherosclerosis in systemic lupus erythematosus. J Rheumatol 2004;31:841-3.  Back to cited text no. 12  [PUBMED]  [FULLTEXT]
13.Frostegard J. SLE, atherosclerosis and cardiovascular disease. J Intern Med 2005;257:485-95.   Back to cited text no. 13  [PUBMED]  [FULLTEXT]
14.Homcy CJ, Liberthson RR, Fallon JT, Gross S, Miller LM. Ischemic heart disease in systemic lupus erythematosus in the young patient:report of six cases. Am J Cardiol 1982;49:478-84.  Back to cited text no. 14  [PUBMED]  [FULLTEXT]
15.Haider YS, Roberts WC. Coronary arterial disease in systemic lupus erythematosus; quantification of degrees of narrowing in 22 necropsy patients (21 women) aged 16-37 years. Am J Med 1981;70:775-81.  Back to cited text no. 15  [PUBMED]  [FULLTEXT]
16.Doherty NE, Siegel RJ. Cardiovascular manifestations of systemic lupus erythematosus. Am Heart J 1985;110:1257-65 Review.  Back to cited text no. 16  [PUBMED]  [FULLTEXT]
17.Bulkley BH, Roberts WC. The heart in systemic lupus erythematosus and the changes induced in it by corticosteroid therapy. A study of 36 necropsy patients. Am J Med 1975;58:243-64.  Back to cited text no. 17  [PUBMED]  [FULLTEXT]
18.Shapiro RF, Gamble CN, Wiesner KB, Castles JJ, Wolf AW, Hurley EJ, et al . Immunopathogenesis of Libman -Sacks endocarditis. Assessment by light and immunofluorescent microscopy in two patients. Ann Rheum Dis 1977;36:508-16.  Back to cited text no. 18    
19.Lopez JA, Ross RS, Fishbein MC, Siegel RJ. Non-bacterial thrombotic endocarditis: a review. Am Heart J 1987;113:773-84.   Back to cited text no. 19  [PUBMED]  [FULLTEXT]
20.Busteed S, Sparrow P, Molloy C, Molloy MG. Myocarditis as a prognostic indicator in systemic lupus erythematosus. Postgrad Med J 2004;80:366-7.  Back to cited text no. 20  [PUBMED]  [FULLTEXT]
21.Riboldi P, Gerosa M, Luzzana C, Catelli L. Cardiac involvement in systemic autoimmune disease. Clin Rev Allergy Immunol 2002;23:247-61.  Back to cited text no. 21  [PUBMED]  [FULLTEXT]
22.Font J, Cervera R, Ingelmo M. Vascular manifestations in Systemic Lupus Erythematosus. In:Asherson RA, Cervera R. editors. Vascular Manifestations of Systemic Autoimmune Disease. Boca Raton: CRC Press; 2001. p. 273-82.  Back to cited text no. 22    
23.Drenkard C, Villa AR, Reyes E, Abello M, Alarcon-Segovia D. Vasculitis in systemic lupus erythematosus. Lupus 1997;6:235-42.   Back to cited text no. 23  [PUBMED]  [FULLTEXT]
24.Musio F, Bohen EM, Yuan CM, Welch PG. Review of thrombotic thrombocytopenic purpura in the setting of systemic lupus erythematosus. Semin Arthritis Rheum 1998;28:1-19.  Back to cited text no. 24  [PUBMED]  [FULLTEXT]


    Figures

[Figure - 1], [Figure - 2], [Figure - 3], [Figure - 4], [Figure - 5]

    Tables

[Table - 1]

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