|Year : 2016 | Volume
| Issue : 4 | Page : 108-112
Assessment of high-sensitivity C-reactive protein values in chronic periodontitis patients with and without cardiovascular disease: A cross-sectional study
D Deepa BDS, MDS 1, Chandni Gupta BDS, Post-graduate Student 1, Abhishek Gupta MBBS, MD 2
1 Department of Periodontology, Subharti Dental College and Hospital, Meerut, Uttar Pradesh, India
2 Department of General Medicine, Subharti Medical College, Meerut, Uttar Pradesh, India
|Date of Web Publication||20-Oct-2016|
Department of Periodontology, Subharti Dental College and Hospital, Meerut - 250 005, Uttar Pradesh
Source of Support: None, Conflict of Interest: None
Background: Periodontal disease is characterized by inflammation and destruction of supporting tissues of the affected teeth. Pro-inflammatory cytokines originating at the site of local pathology activate hepatocytes to produce acute-phase proteins including C-reactive protein (CRP). Numerous cross-sectional studies have suggested that chronic periodontitis is a risk factor for cardiovascular disease (CVD) linked by inflammatory factors including CRP.
Materials and Methods: A total of forty patients, twenty with chronic periodontitis only with no CVD (Group A) and twenty with CVD and chronic periodontitis (Group B), were selected for the study. Clinical parameters including gingival index (GI), plaque index, gingival bleeding index, Pocket probing depth (PD), and clinical attachment level (CAL) were recorded. In addition, high-sensitivity CRP (hsCRP) levels were measured from the peripheral blood using turbidimetric immunoassay technique.
Results: As compared to the patients in Group A, those in Group B had more severe periodontitis with greater CAL (6.02 ± 0.53 mm vs. 6.63 ± 0.85 mm, P = 0.009), probing pocket depth (PPD) (5.20 ± 0.31 mm vs. 5.73 ± 0.52 mm, P < 0.001), and GI score (2.25 ± 0.51 vs. 2.65 ± 0.76, P = 0.06). Group B patients also had significantly higher hsCRP levels (12.3 ± 8.84 mg/L vs. 2.28 ± 0.38 mg/L; P < 0.001). The hsCRP levels had a significant positive correlation with PPD and GI. Multivariate regression analysis showed that the presence of CVD was independently associated with elevated hsCRP levels in the study population.
Conclusion: The present study shows that CVD is associated with more severe periodontitis which is reflected in higher hsCRP levels. In addition, elevated hsCRP showed an independent association with CVD, incremental to various periodontitis measures. These findings suggest that periodontitis may add to the inflammation burden of the individual, which may potentially increase inflammatory activity in atherosclerotic lesions and thus the risk for cardiovascular events.
Keywords: Cardiovascular disease, chronic periodontitis, high sensitivity C-reactive protein, inflammatory burden, particle-enhanced turbidimetric immunoassay technique
|How to cite this article:|
Deepa D, Gupta C, Gupta A. Assessment of high-sensitivity C-reactive protein values in chronic periodontitis patients with and without cardiovascular disease: A cross-sectional study. J Clin Prev Cardiol 2016;5:108-12
|How to cite this URL:|
Deepa D, Gupta C, Gupta A. Assessment of high-sensitivity C-reactive protein values in chronic periodontitis patients with and without cardiovascular disease: A cross-sectional study. J Clin Prev Cardiol [serial online] 2016 [cited 2018 Dec 10];5:108-12. Available from: http://www.jcpconline.org/text.asp?2016/5/4/108/192677
| Introduction|| |
Periodontitis is a common chronic infection of the supporting tissues of the teeth, epidemiologically associated with cardiovascular disease (CVD).  More recent evidence, however, has indicated that patients with severe periodontitis have increased serum levels of C-reactive protein (CRP), hyperfibrinogenemia, moderate leukocytosis, as well as increased serum levels of interleukin (IL-1) and IL-6 when compared with unaffected control populations.  Importantly, based on cross-sectional and prospective epidemiological studies, periodontitis has been linked to CVD and cerebrovascular ischemia, although mechanisms responsible for this association are obscure.  However, links between periodontitis and atherosclerosis would be predicted based on inflammatory mechanisms initiated by bacteria associated with periodontal lesions, locally or systemically, that influence the initiation or propagation of the atherosclerotic lesions. Such lesions may be initiated by inflammatory stimuli including systemic and locally produced inflammatory cytokines and chemotactic agents that cause changes in the endothelium such as upregulation of adhesion molecules. 
CRP was discovered in Tillett and Francis laboratory in 1930 during the course of study of patients with Streptococcus pneumonia infection.  Pro-inflammatory cytokines originating at the site of local pathology activate hepatocytes to produce acute-phase proteins including CRP.  CRP is an acute-phase reactant plasma protein produced in response to diverse inflammatory stimuli.  It binds to phosphocholine, phospholipids, plasma lipoproteins, and the plasma membranes of damaged or apoptotic but not intact cells.  Ligand-bound CRP activates the classical complement pathway 1 and can trigger inflammatory, opsonizing, and complex solubilizing activities of the complement system. CRP levels reflect the extent and activity of disease. , In humans, plasma levels of CRP may rise rapidly and markedly, as much as 1000-fold or more, after an acute inflammatory stimulus, largely reflecting increased synthesis by hepatocytes.  The acute-phase reaction represents an early, nonspecific, and highly complex reaction of the organism to a variety of injuries such as bacterial, viral or parasitic infection, and ischemic necrosis.  CRP in plasma is normally present in low levels (<0.3 mg/dl) but may increase dramatically to hundreds of micrograms per milliliter within 72 h of tissue injury. The amount decreases with the subsidence of the disease process and the recovery of the patient.  Therefore, a cross-sectional study was carried out using high-sensitivity CRP (hsCRP) as a potential marker for the assessment of relationship between chronic periodontitis and CVD. The aim of the study was to compare and evaluate the systemic levels of hsCRP in patients of chronic periodontitis with and without CVD and to assess the relationship among hsCRP levels, periodontal clinical parameters, and the presence of CVD.
| Materials and Methods|| |
The study included forty patients of age group 30-65 years, diagnosed with chronic periodontitis alone (Group A, n = 20) or with chronic periodontitis and CVD (Group B, n = 20). The Group A patients were recruited from the Dental Clinic of our hospital whereas the Group B patients were those admitted for the treatment of CVD at our hospital and were subsequently found to have periodontitis.
Both males and females, having a minimum of twenty teeth, were eligible for inclusion in this study. Patients having any form of systemic disease (apart from CVD in Group B) and/or history of any periodontal surgery in the past 6 months were excluded from the study. Patients were also excluded if they had any of the following conditions: pregnant and lactating females, smokers, use of any antibiotic or anti-inflammatory medication in the past 6 months, any history of trauma or recent tooth extractions, any other systemic infection, and unwillingness to participate in the study. All the patients were informed about the purpose of the study prior to participation. A consent form, duly signed by each patient, was obtained. Ethical Committee clearance was obtained from the Institutional Ethical Committee.
Periodontal disease status was determined using clinical and radiographic criteria. The following parameters were measured: gingival index (GI), plaque index (PI), gingival bleeding index (GBI), probing depth (PD, in mm), clinical attachment level (CAL, in mm), and radiographic alveolar bone loss (ABL). All patients included in the study (Groups A and B both) had chronic generalized periodontitis with marked redness, edema, and tendency of bleeding on probing, at least 8 teeth with PD ≥5 mm, at least eight teeth with CAL ≥5 mm, and radiographic evidence of ABL.
All patients also had measurement of high-sensitivity CRP (hsCRP) levels. A volume of 5 ml of peripheral blood was collected from the patients by venipuncture in the antecubital fossa using tubes with ethylenediaminetetraacetic acid and was immediately sent for centrifugation at 2000 rpm for 5 min. Serum was separated carefully from the centrifuged sample and then stored in a freezer until further analysis. Serum concentrations of hsCRP were quantified using a commercially available particle-enhanced turbidimetric immunoassay (Transasia Bio-Medicals Ltd., Erba Diagnostics, Mannheim, Germany).
Mean, standard deviation, and standard error of mean were calculated for all the clinical parameters and hsCRP levels. Mean data were analyzed by standard statistical method. The parameters were compared between groups using one-way analysis of variance. Karl Pearson's correlation coefficient test was used to measure the correlation of two indices with each other in each group. Multivariate regression analysis was performed to determine independent predictors of hsCRP in the study population. The analysis was performed by the data analysis software through Microsoft Excel 2003 and Statistical software (Statistical Package for Social Sciences or SPSS version 16 SPSS Inc., Chicago, IL, USA). P < 0.05 was considered statistically significant.
| Results|| |
There was no significant difference between the two groups in age (Group A - 51.9 ± 1.9 years; Group B - 54.3 ± 1.87 years, P not significant) or gender distribution (Group A - 12 men, Group B - 11 men, P not significant).
As compared to the patients in Group A, those in Group B had generally more severe periodontitis with greater/more severe CAL (6.02 ± 0.53 mm vs. 6.63 ± 0.85 mm), probing pocket depth (PPD) (5.20 ± 0.31 mm vs. 5.73 ± 0.52 mm), PI score (1.89 ± 0.35 vs. 1.92 ± 1.10), GBI score (81.62 ± 10.4 vs. 83.7 ± 28.0), and GI score (2.25 ± 0.51 vs. 2.65 ± 0.76) [Table 1] and [Figure 1]. However, the difference was statistically significant only for CAL (P = 0.009) and PPD (P < 0.001) with borderline significant difference for GI (P = 0.06).
|Figure 1: Various periodontitis measures and high-sensitivity C-reactive protein levels in the study groups|
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Patients in Group B also had significantly higher hsCRP level (12.3 ± 8.84 mg/L) as compared to the patients in Group A (2.28 ± 0.38 mg/L; P < 0.001) [Table 1] and [Figure 1]. The hsCRP levels had a significant positive correlation with PPD (correlation coefficient: 0.53, P < 0.001) and GI (correlation coefficient: 0.42, P = 0.006) but not with other periodontitis measurements [Table 2].
|Table 1: Various periodontitis measures and high - sensitivity C - reactive protein levels in the study groups|
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|Table 2: Correlation between high-sensitivity C-reactive protein levels and different periodontitis parameters in the study groups|
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Multivariate regression analysis was performed using hsCRP as the independent parameter and the presence of CVD and various periodontitis markers as dependent parameters. The presence of CVD was found to have the strongest association with hsCRP levels in the study population [Table 3].
|Table 3: Multivariate linear regression analysis to assess independent predictive value of various parameters for elevated levels of high-sensitivity C-reactive protein|
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| Discussion|| |
Periodontal inflammation and CVD are prevalent globally.  CVD affects 43 million individuals in the United States with a marked increase in geriatric population. Since this population group is increasing in number and since more elderly individuals are dentate than in the past, there is an increased incidence of periodontal disease in this patient group. This paradoxical finding is applicable to global population subsequently involving the proportionate risk for CVD.  Although the modern era of investigations into the possibility of oral disease being a risk factor or cause of systemic diseases or conditions began approximately 15 years ago,  both diseases have complex etiologies, genetic and gender predispositions, and potentially share many risk factors-the most significant of which may be smoking status.  A study by Ridker et al.,  1998, showed evidence for inflammation playing a role in the pathogenesis of CVD. Some inflammatory or hemostatic markers constitute cardiovascular risk factors. In this respect, the acute-phase reactant, CRP, is of special interest. CRP represents an emerging and reliable marker of the acute-phase response to infectious burdens and/or inflammation. As a consequence of its kinetics, it best describes the inflammatory status of the individual.  Haraszthy et al.  have given cause for suspecting a correlation between periodontal disease and CVD, and atherosclerotic plaques have been shown to contain serotypically identical periodontopathogens from the oral cavity. In another study, it was concluded that the level of CRP increases subsequently with the severity of the periodontal disease. Hence, patients with the periodontal infection have an elevated level of CRP and are at a greater risk of future coronary heart disease.  A large epidemiologic study in the United States determined that total serum cholesterol and plasma levels of CRP and fibrinogen are elevated in patients with periodontitis.  A direct causal relationship between periodontitis and atherosclerotic CVD is not established. However, multiple studies support two biologically plausible mechanisms: (1) Moderate-to-severe periodontitis increases the level of systemic inflammation, a characteristic of all chronic inflammatory diseases, and periodontitis has been associated with increased systemic inflammation as measured by hsCRP and other biomarkers. Treatment of moderate-to-severe periodontitis sufficient to reduce clinical signs of the disease also decreases the level of systemic inflammatory mediators. (2) In untreated periodontitis, 10 8 -10 12 Gram-negative bacteria may be found in periodontal pockets surrounding each diseased tooth and in approximation to ulcerated epithelium, and bacterial species found predominantly in the periodontal pockets also have been found in atheroma. , An indirect relationship between periodontitis and atherosclerotic CVD is the many shared risk factors that commonly occur in the two diseases: (1) Cigarette smoking,  (2) diabetes mellitus, (3) obesity,  (4) lipids, and (5) hypertension.  It must be pointed out that it is likely that the composite effect of multiple infections may ultimately determine how chronic infection could predispose to CVD, as suggested by Armitage.  In a consensus report of the Joint EFP/AAP Workshop on Periodontitis and Systemic Diseases,  it was concluded that the impact of periodontitis on atherosclerotic CVD is biologically plausible: translocated circulating oral microbiotamay directly or indirectly induces systemic inflammation that impacts the pathogenesis of atherothrombogenesis. Previous studies have also demonstrated that CRP levels are higher in periodontitis patients than in periodontally healthy controls and that serum CRP levels are higher in patients with more severe periodontitis. ,
A strong relationship between increased serum hsCRP and presence of chronic periodontitis with CVD is demonstrated in the present study as well. The hsCRP levels were significantly higher in chronic periodontitis patients with CVD group when compared to chronic periodontitis group. These findings point to an association between periodontal infection and CVD, suggesting that a positive correlation exists between the severity of the inflammation and hsCRP levels. These findings are also in accordance with the study conducted by Buhlin et al. 
However, a reduction in the oral infectious burden can result in a reduction in the overall inflammatory load, with positive effects demonstrated on surrogate measures of atherosclerosis as evidenced by meta-analyses. , Gordon Douglass, President of American Academy of Periodontology, had stated that "I foresee patients receiving routine CRP testing in their dentist or periodontist's office in the near future." This could help early diagnosis of disease sooner rather than later, as patients visit their dentist or periodontist at least twice a year.
Our study had certain limitations that merit attention. The most important limitation was the small sample size, which compromised the robustness of our data. However, the present study was only a pilot study, conducted with an objective to gain insights into the relationship between periodontitis, systemic inflammation, and CVD in our study.
In addition, we could not assess the relationship of hsCRP levels with various CVD risk factors and other predictors of CVD. The impact of treatment on hsCRP levels and their relationship with CVD status could also not be studied due to the cross-sectional nature of the present study.
| Conclusion|| |
The present study shows that CVD is associated with more severe periodontitis which is reflected in higher hsCRP levels. In addition, elevated hsCRP showed an independent association with CVD, incremental to various periodontitis measures. These findings suggest that periodontitis may add to the inflammation burden of the individual, which may potentially increase inflammatory activity in atherosclerotic lesions and thus the risk for cardiovascular events.
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Conflicts of interest
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[Table 1], [Table 2], [Table 3]