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עמוד בית
Mon, 17.06.24

Original Articles

IMAJ | volume

Journal 7, July 2006
pages: 464-468

Adult Calcific Aortic Stenosis and Chlamydia pneumoniae: the Role of Chlamydia Infection in Valvular Calcification

    Summary

     Background: Adult calcific aortic stenosis is a well-known clinical entity but its pathophysiology and cellular mechanism have yet to be defined.

    Objectives: To determine whether there is an association between the presence and severity of adult calcific aortic stenosis and Chlamydia pneumoniae seropositivity

    Methods: Forty adult patients (23 women, 17 men) were divided into three groups according to echocardiographic aortic valve area: Group A – 7 symptomatic subjects (age 67 ± 7 years) with normal aortic valve and normal coronary angiogram, Group B – 16 patients (age 73 ± 6) with moderate ACAS[1] (AVA[2]> 0.8 £ 1.5 cm2), and Group C – 17 patients (age 76 ± 7) with severe ACAS (AVA £ 0.8 cm2). We tested for immunoglobulins M, G and A as retrospective evidence of C. pneumoniae infection using the micro-immunofluorescence method. Past C. pneumoniae infection was defined by IgG titer > 16 £ 512.

    Results: No patients in Group A showed positive Ig[3] for C. pneumoniae. IgM was not detected in any of the patients with ACAS (groups B and C) while 2 of 17 patients (12%) in group C showed IgA for the pathogen. High titers of IgG were found in 14 of 33 (42%) of the patients with moderate or severe ACAS: 5 of 16 (31%) in group B and 9 of 17 (53%) in group C (P = 0.2). Both groups had the same prevalence of coronary artery disease (66%). AVA was lower in IgG-seropositive patients than in the seronegative group (0.88 ± 0.3 cm2 vs. 1.22 ± 0.4 cm2, respectively, P = 0.02).

    Conclusions: Past C. pneumoniae infection may be associated with a higher prevalence and greater severity of ACAS.

     

    [1] ACAS = adult calcific aortic stenosis
    [2] AVA = aortic valve area
    [3] Ig = immunoglobulin

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