Does chronic Chlamydia pneumoniae infection increase the risk of myocardial injury? -: Insights from patients with non-ST-elevation acute coronary syndromes

Background Cumulative evidence suggests a positive association between Chlamydia pneumoniae (Cpn) infection and risk of future coronary events among patients with stable coronary artery disease. However, its prognostic role in un-stable coronary syndromes is less well defined. Because Cpn immunoglobulin A (IgA) may be a more reliable indicator of chronic infection than immunoglobulin G (IgG), we speculated that in patients with non-ST-elevation acute coronary syn-, dromes (ACS), this marker might serve as a more useful prognostic tool. Accordingly, we evaluated plasma samples acquired at presentation in 178 patients with ACS for a possible association between Cpn IgA titer and biochemical evidence of myocardial injury. Methods Cpn IgG (positive if 1greater than or equal to32), and IgA titers (positive if greater than or equal to 1:16) were measured by use of the microimmunofluorescence technique in 70 patients With ACS in whom myocardial injury developed associated with their presenting events (elevated CK-MB and/or troponin 1); and in 108 patients with ACS without such injury. The odds ratios (ORs) for myocardial injury associated with consecutive antibody titers were determined for each of Cpn IgG and IgA. Multiple logistic regression was applied to adjust for key baseline characteristics. Results Median age of subjects was 64 years; 63% were male and 33% were smokers. The median antibody titers among those with and without myocardial injury respectively were as follows: IgG (1:, 128 vs 1: 128), IgA (1:32 vs < 1: 16, P =.2). The adjusted ORs for myocardial injury associated with consecutive IgA titers were as follows: IgA greater than or equal to 1:16, adjusted OR 1.49 (P =.22); greater than or equal to 1:32, OR 1.95 (P.04); greater than or equal to 1:64, OR 1.37 (P.38); greater than or equal to 1:128, OR 0.77 (P= .55). No significant trend,was found for any IgG titer. Conclusions Among patients with non-ST-elevation ACS, a Cpn IgA greater than or equal to 1:32 at presentation was associated with a significantly higher risk of myocardial injury complicating the presenting event.