The role of the composite interleukin-1 genotype in the association between periodontitis and acute myocardial infarction.

BACKGROUND: Recent data indicate that interleukin (IL)-1 polymorphism may influence the susceptibility to periodontitis and coronary heart diseases. The aim of this study was to evaluate the impact of the composite IL-1 genotype (allele 2 at IL-1A -889 and IL-1B +3954) in the association between acute myocardial infarction (AMI) and periodontitis. METHODS: One hundred four white subjects (54 patients with AMI and 50 healthy controls) were studied; each received a comprehensive periodontal examination, including measurement of periodontal probing depth (PD) and clinical attachment level (CAL). The extent of periodontitis was assessed by the percentage of sites with clinical AL >3 mm. Polymorphisms in the IL-1 gene cluster were assessed using a reverse hybridization assay. RESULTS: Compared to controls, mean values for PD (4.6 mm versus 3.7 mm; P <0.0001) and CAL (5.4 mm versus 4.5 mm; P = 0.0001) were significantly increased among patients with AMI. Significantly more subjects with moderate or severe periodontitis (> or =33% of sites with clinical AL >3 mm) were found in the AMI group compared to controls (31.5% versus 8%; P = 0.0016). These differences remained statistically significant after adjustment for smoking, age, and gender. No significant differences were observed in the allele frequencies of the gene loci IL-1A -889 and IL-1B +C3954 between patients with AMI and controls. Also, there was no difference in the frequency of the composite IL-1 genotype. IL-1 genotype-positive patients with AMI had slightly increased PD and AL compared to IL-1 genotype-negative patients with AMI. CONCLUSIONS: The results confirmed an association between periodontitis and AMI but failed to detect a modifying impact of the composite IL-1 genotype. Although the IL-1 genotype was only weakly associated with compromised periodontal health, it was not associated with AMI.

Clinical periodontal and microbiologic parameters in patients with acute myocardial infarction.

BACKGROUND: The aim of this study was to evaluate the impact of clinical periodontal parameters and the presence of periodontal pathogens in patients with acute myocardial infarction (AMI). METHODS: A total of 104 subjects (54 patients with AMI and 50 healthy controls) were included. Subgingival plaque samples were analyzed for periodontal pathogens Aggregatibacter actinomycetemcomitans (Aa; previously Actinobacillus actinomycetemcomitans), Porphyromonas gingivalis (Pg), Tannerella forsythia (Tf; previously T. forsythensis), and Prevotella intermedia (Pi) using dot-blot hybridization. RESULTS: Patients with AMI had a significantly higher frequency of probing depths (PDs) >or=4 mm than controls (39.2% versus 14.9%; P <0.0001). Among different cutoff levels, the frequency of >50% sites with PDs >or=4 mm showed the highest discrepancy between both groups (33% versus 0%; P <0.001). All periodontal pathogens were overrepresented in patients with AMI and positively correlated with increased periodontal PD and clinical attachment level (CAL). After adjustment for age, gender, smoking, body mass index, hypertension, plaque index, statin intake, and ratio of cholesterol to high-density lipoprotein, Pg remained a significant predictor for AMI (odds ratio [OR]: 13.6; 95% confidence interval [CI]: 3.1 to 59.8; P = 0.0005). Furthermore, the simultaneous presence of Aa + Pg (P = 0.0005) and Aa + Pg + Tf (P = 0.0018) were found with significantly higher frequency in patients with AMI than controls. CONCLUSIONS: The results of our study confirm an association between periodontitis and AMI in which periodontal destruction was correlated with the presence of periodontal pathogens. In particular, Pg might be considered a potential risk indicator for AMI.