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Hypertension and cardiovascular risk factors in hemodialyzed diabetic patients
Insights
Diabetic patients face significantly higher cardiovascular mortality, especially from sudden, unexplained deaths. Hypertension and cardiomegaly strongly predict cardiovascular death in diabetics, unlike other common risk factors.
Area of Science:
- Cardiology
- Endocrinology
- Public Health
Background:
- Diabetes mellitus is associated with increased cardiovascular risk.
- Understanding specific mortality causes and risk factors in diabetic populations is crucial for targeted interventions.
Purpose of the Study:
- To analyze causes of death and cardiovascular risk factors in diabetic versus non-diabetic patients.
- To compare cardiovascular mortality rates between Type I and Type II diabetes and matched controls.
- To identify predictors of cardiovascular death in diabetic individuals.
Main Methods:
- Retrospective study matching 200 diabetic patients with 200 non-diabetic controls.
- Analysis of causes of death, cardiovascular mortality, and risk factors including hypertension, retinopathy, and cardiomegaly.
- Comparison of mortality rates and risk factor impact between diabetic subtypes and controls.
Main Results:
- Diabetics exhibited considerably higher total and cardiovascular mortality (4.8x higher in Type I, 3.0x higher in Type II vs. controls).
- Cardiovascular deaths were significantly higher in diabetics (58% rate, 38% proportion), with 80% attributed to sudden death of unknown cause.
- Hypertension and cardiomegaly (with ECG abnormalities) were strong predictors of cardiovascular death in diabetics; retinopathy and macroangiopathy showed minimal impact.
Conclusions:
- Diabetes significantly elevates cardiovascular mortality, predominantly from sudden, unexplained deaths.
- Hypertension and cardiomegaly are critical predictors of cardiovascular death in diabetic patients.
- Further research into the mechanisms of sudden cardiac death in diabetes is warranted.
Abstract:
In a retrospective study, the cause of death and the cardiovascular risk conferred by hypertension and other risk factors were analyzed in 200 diabetic and 200 nondiabetic patients who were matched for age, sex, year of admission, and center of treatment. Total and cardiovascular mortality were considerably higher in diabetics, cardiovascular mortality being 4.8 times higher in patients with type I and 3.0 times higher in those with type II diabetes compared to matched controls. Cardiovascular mortality progressively increased with age and had not improved in recent years. In both types I and II diabetes, the rate (58%) and proportion (38%) of deaths from cardiovascular causes were significantly higher in diabetics than in matched controls. Myocardial infarction (13%) and stroke (7%) accounted only for a minority of cardiovascular mortality, the majority (80%) being due to "sudden death of unknown cause." Autopsy was carried out in 33% of patients with sudden death. A documented history of long-standing hypertension increased cardiovascular death in diabetic more than in nondiabetic patients. Diabetic retinopathy (an index of microangiopathy) and absence of peripheral pulses, amputation, or history of myocardial infarction, stroke, or transient ischemic attacks (as evidence of macroangiopathy) caused surprisingly little increase in relative risk for cardiovascular death. In diabetics but not in nondiabetics, cardiomegaly, particularly in association with electrocardiographic abnormalities, was a strong predictor of cardiovascular death.