Use of statins and the incidence of type 2 diabetes mellitus

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Abstract

SummaryIntroduction:the use of statins is associated with reduced cardiovascular risk in studies of primary and secondary prevention, and the reduction is directly proportional to the reduction of LDL-cholesterol. Recent evidence suggests that statins may be associated with a higher incidence of new cases of diabetes. The aim of this review is to explore this possibility, identifying factors associated with the increase in risk and the potential diabetogenic mechanisms of statins. In addition, we evaluated if the risk of diabetes interferes with the reduction in cardiovascular risk achieved with statins.Methods:we reviewed articles published in the Scielo and Pubmed databases, which assessed or described the association between use of statins and risk of diabetes up to June 2015.Results:use of statins is associated with a small increase in the incidence of new cases of diabetes. Age, potency of statin therapy, presence of metabolic syndrome, impaired fasting blood glucose, overweight and previously altered glycated hemoglobin levels are associated with increased risk of diabetes, but there is no consensus about the possible diabetogenic mechanisms of statins. In patients candidate to hypolipemiant drug therapy, the benefit of reducing cardiovascular risk outweighs any risk increase in the incidence of diabetes.Conclusion:statins are associated with a small increase in incidence of diabetes in patients predisposed to glycemic alteration. However, since the benefit of cardiovascular risk reduction prevails even in this group, there is no evidence to date that this finding should change the recommendation of starting statin therapy.

Translated abstract

ResumoIntrodução:o uso de estatinas está associado à redução do risco cardiovascular em estudos de prevenção primária e secundária, e essa redução ocorre de modo diretamente proporcional à redução de LDL-colesterol. Evidências recentes sugerem que estatinas podem estar associadas à maior incidência de novos casos de diabetes. O objetivo desta revisão é identificar os fatores associados ao aumento de risco e os potenciais mecanismos diabetogênicos das estatinas. Além disso, avaliou-se se o risco de diabetes interfere na redução de risco cardiovascular obtida com as estatinas.Métodos:foram revisados artigos publicados nas bases de dados Scielo e Pubmed, que avaliaram ou descreveram a associação do uso de estatinas com o risco de diabetes até junho de 2015.Resultados:o uso de estatinas está associado a um pequeno aumento na incidência de novos casos de diabetes. Idade, potência do tratamento com estatina, presença de síndrome metabólica, glicemia de jejum alterada, excesso de peso e hemoglobina glicada previamente alterada estão associados a um maior risco de diabetes, mas não há consenso sobre os possíveis mecanismos diabetogênicos das estatinas. Nos pacientes candidatos à terapêutica hipolipemiante, o benefício de redução do risco cardiovascular supera qualquer aumento de risco na incidência de diabetes.Conclusão:estatinas estão associadas a um pequeno aumento na incidência de diabetes em pacientes predispostos a alterações glicêmicas. Entretanto, como persiste, mesmo nesse grupo, o benefício da redução de risco cardiovascular, não há qualquer evidência até o momento de que esse achado deva mudar a decisão de iniciar o tratamento com estatinas.

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Predictors of new-onset diabetes in patients treated with atorvastatin: results from 3 large randomized clinical trials.

David D. Waters, Jennifer E. Ho, David DeMicco … (2011)

We sought to examine the incidence and clinical predictors of new-onset type 2 diabetes mellitus (T2DM) within 3 large randomized trials with atorvastatin. Statin therapy might modestly increase the risk of new-onset T2DM. We used a standard definition of diabetes and excluded patients with prevalent diabetes at baseline. We identified baseline predictors of new-onset T2DM and compared the event rates in patients with and without new-onset T2DM. In the TNT (Treating to New Targets) trial, 351 of 3,798 patients randomized to 80 mg of atorvastatin and 308 of 3,797 randomized to 10 mg developed new-onset T2DM (9.24% vs. 8.11%, adjusted hazard ratio [HR]: 1.10, 95% confidence interval [CI]: 0.94 to 1.29, p = 0.226). In the IDEAL (Incremental Decrease in End Points Through Aggressive Lipid Lowering) trial, 239 of 3,737 patients randomized to atorvastatin 80 mg/day and 208 of 3,724 patients randomized to simvastatin 20 mg/day developed new-onset T2DM (6.40% vs. 5.59%, adjusted HR: 1.19, 95% CI: 0.98 to 1.43, p = 0.072). In the SPARCL (Stroke Prevention by Aggressive Reduction in Cholesterol Levels) trial, new-onset T2DM developed in 166 of 1,905 patients randomized to atorvastatin 80 mg/day and in 115 of 1,898 patients in the placebo group (8.71% vs. 6.06%, adjusted HR: 1.37, 95% CI: 1.08 to 1.75, p = 0.011). In each of the 3 trials, baseline fasting blood glucose, body mass index, hypertension, and fasting triglycerides were independent predictors of new-onset T2DM. Across the 3 trials, major cardiovascular events occurred in 11.3% of patients with and 10.8% of patients without new-onset T2DM (adjusted HR: 1.02, 95% CI: 0.77 to 1.35, p = 0.69). High-dose atorvastatin treatment compared with placebo in the SPARCL trial is associated with a slightly increased risk of new-onset T2DM. Baseline fasting glucose level and features of the metabolic syndrome are predictive of new-onset T2DM across the 3 trials. Copyright © 2011 American College of Cardiology Foundation. Published by Elsevier Inc. All rights reserved.