Glycemia and cardiovascular disease in type 1 diabetes mellitus.

OBJECTIVE: To evaluate the role of glycemic control in the development of cardiovascular disease (CVD) in type 1 diabetes mellitus (DM). METHODS: We review the literature regarding coronary atherosclerosis, coronary artery calcification, and the epidemiologic studies related to the role of glycemia and the classic risk factors for coronary artery disease (CAD) in type 1 DM. RESULTS: Four prospective studies (Wisconsin Epidemiologic Study of Diabetic Retinopathy, EURODIAB, Steno Diabetes Center Study of Adults With Type 1 DM, and Pittsburgh Epidemiology of Diabetes Complications study) do not show that glycemic control predicts CAD occurrence. Findings from the Diabetes Control and Complications Trial/Epidemiology of Diabetes Interventions and Complications study show that compared with conventional insulin therapy, intensive insulin therapy reduces CVD among patients with type 1 DM and is associated with lower prevalence of coronary artery calcification. The discrepancies between the findings from the Diabetes Control and Complications Trial/Epidemiology of Diabetes Interventions and Complications study and the Pittsburgh Epidemiology of Diabetes Complication study are likely due to differences between the study populations and the lower prevalence of renal disease in the former study. Besides duration of DM and albuminuria/overt nephropathy, insulin resistance is a major determinant of CAD associated with type 1 DM. CONCLUSIONS: Discrepant study results regarding the relationship between glycemia and CAD/coronary artery calcification may be related to the prevalence of renal disease and the presence of the metabolic syndrome. Published data suggest that addressing traditional risk factors including albuminuria, the metabolic syndrome, and inflammatory markers is better for preventing and treating CAD than focusing exclusively on glycemic control, which is still necessary for preventing microvascular complications. Furthermore, there is a synergistic effect of glycemic control and albuminuria on the development of CVD.

[The prevalence of diabetes and stress hyperglycemia in the acute myocardial infarction patients]. / Avaliação da prevalência do diabetes e da hiperglicemia de estresse no infarto agudo do miocárdio.

OBJECTIVES: To evaluate in our population the real prevalence of diabetes (DM) and stress hyperglycemia (HE) in patients with myocardial infarction (IAM) admitted in a cardiologic emergency unit. METHODS: A retrospective analysis of 2262 patients with AMI evaluating the prevalence of DM (referred and diagnosed) and stress hyperglycemia. RESULTS: Besides 12.1% of subjects were previously referred to be diabetic (men: 10.7% and women: 15.8%), diabetes was effectively diagnosed in 24.8% (M: 22.9%, W: 29.7%) and stress hyperglycemia in 13.6% HE of the patients (M: 14.3%, W: 11,7%) indicating that glycemic alterations were effectively observed in 37.2.% of the patients with IAM (M: 37.2%, W: 41.4%). In DM subjects IAM events occurred earlier, total intra-hospital mortality was higher (DM: 20.7%, ND: 13.8%, HE: 13.4%) and less surgical procedures were performed (ND 33.8%, DM: 21.7%, HE: 18.0%). CONCLUSION: The elevated DM and stress hyperglycemia prevalence observed in our study indicates that glycemic alterations is one of the most important risk factors for IAM.

[Cardiovascular disease in type 1 diabetes mellitus]. / Doença cardiovascular no diabetes melito tipo 1.

The association between type 1 diabetes and coronary heart disease has become very clear since the late 1970. It has been demonstrated that there is an important increased risk in morbidity and mortality caused by coronary artery disease in young adults with type 1 diabetes compared with the non diabetic population. The underlying pathogeneses is still poorly understood. While the role of glycemic control in the development of microvascular disease complication is well established its role in CVD in patients with DM1 remains unclear with epidemiologic studies reporting conflicting data. Recent findings from the DCCT/EDIC showed that prior intensive diabetes treatment during the DCCT was associated with less atherosclerosis, largely because of reduced level of HbA1c during the DCCT. The improvement of glycemic control itself appeared to be particularly effective in younger patients with shorter duration of the disease. Other analyses suggested the glycemia may have a stronger effect on CAD in patients without than in those with albuminúria. Other major determinants of coronary artery disease are the components of metabolic syndrome and the surrogate measure of insulin resistence: eGDR. It is proposed that patients with DM1 should have aggressive medical therapy, risk factor modification and careful monitoring not only of his blood sugar but also of the other processes involved in the atherosclerotic process, mostly the ones with family history of type 2 diabetes.

Avaliação da prevalência do diabetes e da hiperglicemia de estresse no infarto agudo do miocárdio / The prevalence of diabetes and stress hyperglycemia in the acute myocardial infarction patients

OBJETIVOS: Determinar a prevalência do diabetes melito (DM) e da hiperglicemia de estresse (HE) em pacientes com infarto agudo do miocárdio (IAM) admitidos em unidade de emergência cardiológica. MÉTODOS: Análise retrospectiva de 2.262 pacientes com IAM, avaliando, além da prevalência de diabetes referido, o diagnosticado e a hiperglicemia de estresse. RESULTADOS: Apesar de referido em 12,1 por cento dos pacientes (H: 10,7 por cento, M: 15,8 por cento), o DM ocorria efetivamente em 24,8 por cento (H: 22,9 por cento, M: 29,7 por cento) e a HE em 13,6 por cento (H: 14,3 por cento, M: 11,7 por cento) dos indivíduos dessa população. Portanto, alterações glicêmicas ocorreram em 37,4 por cento dos indivíduos com IAM (H: 37,2 por cento, M: 41,4 por cento). Nos pacientes com DM, observou-se maior precocidade etária do IAM, maior prevalência de óbitos (DM: 20,7 por cento, ND:13,8 por cento, HE: 13,4 por cento) e de procedimentos cirúrgicos (ND: 33,8 por cento, HE: 18,0 por cento, DM: 21,7 por cento). CONCLUSÃO: A elevada prevalência de DM e hiperglicemia de estresse observada em nosso estudo indica que as alterações glicêmicas constituem um dos mais importantes fatores de risco para o IAM.

OBJECTIVES: To evaluate in our population the real prevalence of diabetes (DM) and stress hyperglycemia (HE) in patients with myocardial infarction (IAM) admitted in a cardiologic emergency unit. METHODS: A retrospective analysis of 2262 patients with AMI evaluating the prevalence of DM (referred and diagnosed) and stress hyperglycemia. RESULTS: Besides 12,1 percent of subjects were previously referred to be diabetic (men: 10.7 percent and women: 15.8 percent), diabetes was effectively diagnosed in 24,8 percent (M: 22,9 percent, W: 29,7 percent) and stress hyperglycemia in 13,6 percent HE of the patients (M: 14,3 percent, W: 11,7 percent) indicating that glycemic alterations were effectively observed in 37.2. percent of the patients with IAM (M: 37,2 percent, W: 41,4 percent). In DM subjects IAM events occurred earlier, total intra-hospital mortality was higher (DM: 20.7 percent, ND: 13,8 percent, HE: 13,4 percent) and less surgical procedures were performed (ND 33.8 percent, DM: 21.7 percent, HE: 18.0 percent). CONCLUSION: The elevated DM and stress hyperglycemia prevalence observed in our study indicates that glycemic alterations is one of the most important risk factors for IAM.

Doença cardiovascular no diabetes melito tipo 1: [revisão] / Cardiovascular disease in type 1 diabetes mellitus: [review]

O risco de doença arterial coronariana (DAC) nos pacientes com diabetes melito tipo 1 (DM1) é conhecido desde o final dos anos 1970, sendo atualmente a principal causa de mortalidade na população adulta com diabetes tipo 1 de longa duração. A patogênese do processo aterosclerótico nesta doença ainda é obscura, acreditando-se que a hiperglicemia desenvolva aí um papel importante, entretanto vários estudos epidemiológicos mostraram que a associação entre doença coronariana e glicemia, em pacientes com DM1 seja fraca. Dados recentes do estudo DCCT/EDIC mostram que o grupo que recebeu tratamento insulínico intensificado durante o DCCT desenvolveu graus menores de aterosclerose, relacionado aos valores reduzidos de HbA1c durante a fase ativa do estudo, com melhor proteção nos pacientes mais jovens e com menor duração da doença. Há também evidências de que os benefícios são maiores nos pacientes sem nefropatia quando comparados aos com doença renal. Outros fatores de risco importante para o desenvolvimento de DAC em pacientes com DM1 são os mesmos descritos para DM2, incluindo os componentes da síndrome metabólica e marcadores de resistência insulínica. Sugere-se que pacientes com DM1 devam ter o melhor controle glicêmico possível, desde o início da sua doença acrescido de vigilância e tratamento rígido dos fatores de riscos clássicos para DAC, principalmente naqueles com história familiar de DM2.

The association between type 1 diabetes and coronary heart disease has become very clear since the late 1970. It has been demonstrated that there is an important increased risk in morbidity and mortality caused by coronary artery disease in young adults with type 1 diabetes compared with the non diabetic population. The underlying pathogeneses is still poorly understood. While the role of glycemic control in the development of microvascular disease complication is well established its role in CVD in patients with DM1 remains unclear with epidemiologic studies reporting conflicting data. Recent findings from the DCCT/EDIC showed that prior intensive diabetes treatment during the DCCT was associated with less atherosclerosis, largely because of reduced level of HbA1c during the DCCT. The improvement of glycemic control itself appeared to be particularly effective in younger patients with shorter duration of the disease. Other analyses suggested the glycemia may have a stronger effect on CAD in patients without than in those with albuminúria. Other major determinants of coronary artery disease are the components of metabolic syndrome and the surrogate measure of insulin resistence: eGDR. It is proposed that patients with DM1 should have aggressive medical therapy, risk factor modification and careful monitoring not only of his blood sugar but also of the other processes involved in the atherosclerotic process, mostly the ones with family history of type 2 diabetes.