Abstract
Objectives
This study aims to estimate the impact of disease activity, obesity, functional disability, and depression on lipid status, glycoregulation, and risk for coronary heart disease (CHD) in patients with rheumatoid arthritis (RA).
Patients and methods
A total of 36 patients with RA (30 women and 6 men, mean age 54.9 years, mean disease duration 7.9 years) were included in this study. We estimated the impact of age, body mass index, disease activity [assessed by DAS28 index and C-reactive protein (CRP) value], functional ability (estimated using the HAQ disability index), and depression [assessed using the Beck Depression Inventory (BDI)] on glycoregulation, lipid status, and risk for CHD in our patients. Glycoregulation was assessed by measuring insulin resistance, insulin, and glucose in blood. Lipids tested in blood included total cholesterol, HDL and LDL cholesterol, and triglycerides (TG). The 10-year risk for CHD was estimated using the Framingham risk score.
Results
Of 36 patients, 11 (30.6 %) fulfilled the criteria for metabolic syndrome (MS). Ten of 11 patients (90.1 %) with MS have a 10-year risk for CHD greater than 10 % compared to only 3 of 25 patients (12 %) without MS (p = 0.0001). Patients with high disease activity had lower HDL values than patients with mild or moderate disease activity (1.4 vs. 1.7 mmol/l, p = 0.04). Significant correlations were observed between CRP level and insulinemia (ρ = 0.57, p = 0.003), as well as CRP level and the HOMA index (ρ = 0.59, p = 0.002). The body mass index (BMI) correlated significantly with total cholesterol (r = 0.46, p = 0.02), LDL (ρ = 0.41, p = 0.04), and TG (ρ = 0.65, p < 0.001) in blood. The HAQ-DI did not correlate either with parameters of glycoregulation or lipid status. There was a significant positive correlation between BDI and BMI (ρ = 0.60, p < 0.001).
Conculsion
Active RA is independently associated with decreased HDL cholesterol and increased insulin resistance. Obesity was found to be an independent risk factor for increased total cholesterol, LDL cholesterol, and TG. Depressed patients with RA tend to be overweight or obese and, therefore, have an unfavorable lipid profile.
Zusammenfassung
Zielsetzung
Ziel der Studie ist die Untersuchung möglicher Einflüsse von Krankheitsaktivität, Adipositas, funktioneller Behinderung und Depression auf den Lipidstatus, die Glukoseregulation und das Risiko für eine koronare Herzerkrankung (KHK) bei Patienten mit rheumatoider Arthritis (RA).
Patienten und Methoden
Insgesamt 38 RA-Patienten (30 weiblich, 6 männlich, Durchschnittsalter 54,9 Jahre, durchschnittliche Erkrankungsdauer 7,9 Jahre) wurden in die Studie aufgenommen. Abgeschätzt wurde der Einfluss von Alter, Body-Mass-Index, Erkrankungsaktivität [Assessment mittels DAS28-Index und CRP(C-reaktives Protein)-Konzentration], funktionalem Status (Näherung mittels HAQ Disability Index) und Depression [Messung mit dem BDI (Beck Depression Inventory)] auf die Glukoseregulation, den Lipidstatus und das KHK-Risiko. Laborchemisch bestimmt wurden Insulinresistenz, Insulin und Glukose sowie Gesamt-, HDL- und LDL-Cholesterin und Triglyzeride (TG). Das Zehnjahresrisiko für die Entwicklung einer KHK wurde anhand des Framingham-Risikoscores geschätzt.
Ergebnisse
Von 36 Patienten erfüllten 11 (30,6 %) Kriterien für das metabolische Syndrom (MS). Ein Zehnjahres-KHK-Risiko von über 10% haben 10 von 11 (90,1%) Patienten mit einem MS, dagegen nur 3 von 25 (12%) Patienten ohne MS (p = 0,0001). Patienten mit hoher Krankheitsaktivität hatten niedrigere HDL-Werte als Patienten mit geringer oder mäßiger Krankheitsaktivität (1,4 vs. 1,7 mmol/l, p = 0,04). Statistisch signifikante Korrelationen zeigten sich sowohl zwischen CRP-Werten und Insulinämie (ρ = 0,57, p = 0,003) als auch zwischen CRP und HOMA-Index (ρ = 0,59, p = 0,002). Der Body-Mass-Index (BMI) korrelierte signifikant mit dem Gesamt- (r = 0,46, p = 0,02) und mit dem LDL-Cholesterin (ρ = 0,41, p = 0,04) sowie mit TG (ρ = 0,65, p < 0,001) im Serum. Der HAQ-DI-Score wies keine Korrelation auf mit Glukohomöostaseparametern oder dem Lipidstatus auf. Zwischen BDI und BMI bestand eine signifikante positive Korrelation (ρ = 0,60, p < 0,001).
Schlussfolgerungen
Eine aktive RA ist unabhängig assoziiert mit erniedrigten HDL-Cholesterin-Werten und erhöhter Insulinresistenz. Adipositas erwies sich als ein unabhängiger Risikofaktor für höhere Konzentrationen von Gesamtcholesterin, LDL-Cholesterin und TG. Depressive RA-Patienten neigen zu Übergewicht bzw. Adipositas und weisen daher ein ungünstiges Lipidprofil auf.
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Conflict of interest. P. Ostojic and D. Bartolovic state that there are no conflicts of interest.
All studies on humans described in the present manuscript were carried out with the approval of the responsible ethics committee and in accordance with national law and the Helsinki Declaration of 1975 (in its current, revised form). Informed consent was obtained from all patients included in studies.
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Ostojic, P., Bartolovic, D. Disease activity, obesity, functional disability, and depression in patients with rheumatoid arthritis. Z Rheumatol 75, 716–722 (2016). https://doi.org/10.1007/s00393-015-1661-7
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DOI: https://doi.org/10.1007/s00393-015-1661-7