1Chronic Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung
Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
22- Chronic Respiratory Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
31- Safety promotion and injury prevention research center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
4Tracheal Diseases Research Center, National Research Institute of Tuberculosis and Lung Diseases (NRITLD), Shahid Beheshti University of Medical Sciences, Tehran, Iran
Background and aims: Ankylosing spondylitis (AS) is an idiopathic chronic inflammatory disease mainly involves sacroiliac and axial joints; but it may also have extra-articular involvement. Accordingly, this study was designed to determine the frequency of cardiac involvement among patients with ankylosing spondylitis.
Methods: This study was performed as a descriptive-analytical cross-sectional survey. In this study 50 consecutive patients with AS and 40 normal healthy subjects were enrolled and compared for cardiologic manifestations.
Results: The frequency of cardiac involvement was similar between AS patients and normal subjects (P>0.05). However, there was significant difference between 2 groups in point of mitral valve prolapse and mitral regurgitation (P<0.05).
Conclusions: Totally, according to the obtained results, it may be concluded that the frequency of cardiac involvement in AS patients and normal subjects were relatively similar.
Ankylosing spondylitis (AS) is an idiopathic chronic inflammatory disease belonging to the group of spondyloarthritides associated with HLA B-27 involving sacroiliac and axial and also peripheral joints and it predominantly affects the spine.1,2 It also has extra particular involvements such as acute anterior uveitis, cardiac conductive problem, lung upper lobe fibrosis, neurological involvement, and amyloidosis.3-5 Prevalence of AS in northern America is relatively 0.2%6 ,and in Europe the frequency of this disorder is even more.7,8 The related incidence is also 7.3 to 8.9 per 100,000 subjects every year. Male to female ratio is 3-5 to one and the clinical manifestations are different between the two sexes with less probability of progression to vertebral deformity.9,10
AS patients, regarding to multi-system involvements, not only experience somatic problems but also psychological problems and totally their life quality may be decreased.11,12 So, rapid diagnosis and treatment in each system is crucial.13,14 However, the immune dysfunction is the hallmark of Ankylosing spondylitis, it may affect important vital organs such as cardiovascular system. The primary site of inflammation in AS is the entheses, the sites of insertion of tendons and ligaments into the bone. The importance is also more increased for involvement of essential organs such as cardiac system due to the decreased morbidity and mortality in early-diagnosis cases with prompt treatment. Accordingly this study was designed to determine the frequency of cardiac involvement in patients with ankylosing spondylitis.
This observational cross-sectional comparative study was performed on 50 patients with AS (according to New York Criteria) attending to three training referral health care centre and they were selected in a census manner. For all the patients, in their visits, clinical examination, laboratory assessments especially for HLA-B27, and radiographic studies of spinal column and sacroiliac joints were performed and the grade of disease was determined.
We also selected a comparison group including 40 normal healthy individuals among the subjects who associated with patients and had no sign or symptom of AS or other rheumatologic diseases. The patients in two groups were similar for their age, sex, smoking status, and background history of diseases such as hypertension, ischemic heart disease, and diabetes.
Data analysis was performed among 90 subjects including 40 subjects in control group and 50 AS patients in intervention group. Data analysis was performed by SPSS (version 18.0) software [Statistical Procedures for Social Sciences; Chicago, Illinois, USA]. Chi-Square and independent-sample-T tests were used and P values less than 0.05 was considered statistically significant.
The mean (± standard deviation) age of control and patients groups were 33.97±10.72 and 33.65±10.32 years, respectively (P>0.05). Thirty seven subjects (92.5%) in comparison group and 46 patients (92%) in case group were male (P>0.05). The mean (± standard deviation) duration of involvement was 8.6±6.3 years.
In AS group, 48 patients (96%) had low back pain, 43 subjects (86%) had enteritis, 50 patients (100%) had sacroileitis, and 22 subjects (44%) had peripheral arthritis. The HLA-B27 was positive in 27 patients (54%). The involvement was unilateral in one patient (2%). The frequency of cardiac involvement was similar across the groups (Table 1); however, the difference was significant for mitral valve prolapse and mitral regurgitation (P<0.05).
Table 1: Cardiac involvement in AS patients and comparison groups
Mitral Valve Prolapse
*As Right bundle branch block; **2 cases of PVC, one case of right bundle branch block, and one invert T case
Heart involvement is the main cause of mortality and morbidity in MS patients.15 This study showed that mitral valve prolapse and regurgitation were the only cardiac involvements differed between AS patients and comparison group. These two involvements were also the most common ones in AS patients. In the conducted study in Turkey16 among 88 AS patients, 5.7% had mitral valve prolapse and 5.7% and 2.3% had mitral regurgitation and aortic insufficiency, respectively. The reported frequencies in our study were higher.
In conducted study in Hangary17 among 100 AS patients, 14% had cardiac vulvular involvement and 17% had conductive disorder. However, in our study the frequency of vulvular involvement was higher and the conductive disorders were less common. Another study in Ireland18 showed that 7 out of 24 AS patients had cardiac involvement of which one patient had pericardial effusion, three had conductive disorder, and 2 had aortic insufficiency. These frequencies showed that vulvular disorder in their study were lower and the conductive disorders were higher.
In the study performed in the United States,19 44 AS patients and 25 healthy volunteers were compared and it was seen that 82% and 27% in patients and control groups had aortic valve disorder that the observed frequencies were lower in our study. Another study in the United States20 demonstrated that 10% and 33% of AS patients had aortic valve involvement and conductive disorders, but the frequency of vulvular disorders was higher in our study and the conductive problems were less common. A different study21 indicated that 5 patients of 28 AS patients had dilated cardiomyopathy in echocardiographic evaluation, although we could not integrate the echocardiographic findings in our study which was a limitation of our study. Also Park et al demonstrated that the prevalence of aortic and mitral regurgitation was very low and there was no significant difference between the control and the patient groups.22 However, in our study the mitral valve regurgitation was significantly higher in patients with AS in comparison with control subjects.
it may be concluded that the frequency of cardiac involvement in AS and normal subjects was similar, but some types such as mitral regurgitation and mitral valve prolapse were more common among AS patients compared with normal healthy subjects. However, further studies are required for certification of our findings in current study.
CONFLICT OF INTEREST
The authors declare that they have no conflict of interests.
We are grateful to the patients who participated in this study; and helped us in conducting this research, especially in acquisition of the data.
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