Mortality rates in diabetic patients from a community-based population compared to local age/sex matched controls

Endothelial function, adipokine serum levels and white matter hyperintesities in subjects with diabetic foot syndrome

CONTEXT

No study analysed the prevalence of white matter hyperintesities (WMHs) in subjects with diabetic foot syndrome (DFS) and their relationship with adipokine serum levels and indexes of endothelial and cognitive performance.

OBJECTIVE

To evaluate omentin and vaspin serum levels and WMHs prevalence in subjects with DFS and to analyse their relationship with other endothelial, arterial stiffness and cognitive function.

RESEARCH DESIGN AND METHODS

Case-control study enrolling 40 subjects with DFS, 40 diabetic subjects without foot complications, 40 controls with foot lesions without diabetes and 40 patients without diabetes mellitus.

MAIN OUTCOME MEASURE

Pulse wave velocity (PWV), augmentation index (Aix), Reactive hyperemia index (RHI), serum vaspin and omentin levels, Fazekas Score, MMSE.

RESULTS

Subjects with DFS showed higher mean PWV values if compared with diabetic controls, lower RHI values if compared with controls. They also showed a lower mean MMSE score, significantly lower omentin serum levels, a higher prevalence of grade 2 severity of periventricular hyperintensities (PVH). We observed a significant positive correlation between PWV and PVH, between Fazekas Score and PWV among diabetic subjects, whereas among subjects with diabetic foot we observed a significant negative correlation between PVH and RHI.

CONCLUSIONS

Diabetes seems to be more associated with endothelial function disturbance in comparison with patients with diabetic foot that exhibit a more strict association with microvascular brain damage as indicated by our significant finding of an association with periventricular hyperintensities.

Risk of all-cause and CHD mortality in women versus men with type 2 diabetes: a systematic review and meta-analysis

OBJECTIVE

Previous studies have shown sex-specific differences in all-cause and CHD mortality in type 2 diabetes. We performed a systematic review and meta-analysis to provide a global picture of the estimated influence of type 2 diabetes on the risk of all-cause and CHD mortality in women vs men.

METHODS

We systematically searched PubMed, EMBASE and Web of Science for studies published from their starting dates to Aug 7, 2018. The sex-specific hazard ratios (HRs) and their pooled ratio (women vs men) of all-cause and CHD mortality associated with type 2 diabetes were obtained through an inverse variance-weighted random-effects meta-analysis. Subgroup analyses were used to explore the potential sources of heterogeneity.

RESULTS

The 35 analyzed prospective cohort studies included 2 314 292 individuals, among whom 254 038 all-cause deaths occurred. The pooled women vs men ratio of the HRs for all-cause and CHD mortality were 1.17 (95% CI: 1.12-1.23, I2 = 81.6%) and 1.97 (95% CI: 1.49-2.61, I2 = 86.4%), respectively. The pooled estimate of the HR for all-cause mortality was approximately 1.30 in articles in which the duration of follow-up was longer than 10 years and 1.10 in articles in which the duration of follow-up was less than 10 years. The pooled HRs for all-cause mortality in patients with type 2 diabetes was 2.33 (95% CI: 2.02-2.69) in women and 1.91 (95% CI: 1.72-2.12) in men, compared with their healthy counterparts.

CONCLUSIONS

The effect of diabetes on all-cause and CHD mortality is approximately 17 and 97% greater, respectively, for women than for men.

Mortality and causes of death in a national sample of type 2 diabetic patients in Korea from 2002 to 2013

BACKGROUND

We aimed to investigate the mortality rate (MR), causes of death and standardized mortality ratio (SMR) in Korean type 2 diabetic patients from 2002 to 2013 using data from the Korean National Health Insurance Service-National Sample Cohort (NHIS-NSC).

METHODS

From this NHIS-NSC, we identified 29,807 type 2 diabetic subjects from 2002 to 2004. Type 2 diabetes was defined as a current medication history of anti-diabetic drugs and the presence of International Classification of Diseases (ICD)-10 codes (E11-E14) as diagnosis. Specific causes of death were recorded according to ICD-10 codes as the following: diabetes, malignant neoplasm, disease of the circulatory system, and other causes.

RESULTS

A total of 7103 (23.8 %) deaths were recorded. The MR tended to increase with age. In particular, the ratio of MR for men versus women was the highest in their 40s-50s. The overall SMR was 2.32 and the SMRs attenuated with increasing age. The causes of death ascribed to diabetes, malignant neoplasm, ischemic heart disease, cerebrovascular disease, and other causes were 22.0, 24.8, 6.2, 11.2 and 31.3 %, respectively. The SMRs according to each cause of death were 9.73, 1.76, 2.60, 2.04 and 1.89, respectively.

CONCLUSIONS

The MRs among type 2 diabetic subjects increased with age, and diabetic men exhibited a higher mortality risk than diabetic women in Korea. Subjects with type 2 diabetes exhibited an excess mortality when compared with the general population. Approximately 78.0 % of the diabetes-related deaths was not ascribed to diabetes, and malignant neoplasm was the most common cause of death among those not recorded as diabetes.

Update of mortality attributable to diabetes for the IDF Diabetes Atlas: Estimates for the year 2013

BACKGROUND

Mortality is an important measure of population health and is often used to assign priorities in health interventions. Estimating mortality due to diabetes has been challenging because more than a third of countries of the world have no reliable data available on mortality. Moreover estimating mortality attributable to Diabetes is especially challenging since most people die of a related vascular complication such as cardiovascular disease or renal failure.

AIMS

The aim of the study was to provide estimate of the number of deaths attributable to diabetes for the year 2013.

METHODS

A computerized disease model was used to obtain the estimates. Using WHO life tables for 2010 and IDF diabetes prevalence estimates for 2013, age and sex-specific relative risks of death for persons with diabetes were calculated, in order to estimate the number of deaths attributable to diabetes in people 20-79 years of age.

RESULTS

This model estimated that globally, 8.4% of all-cause deaths were attributable to diabetes in adults aged 20-79 years, almost 5.1 million deaths. A sensitivity analysis adjusting relative risks by 20% found that the estimate of diabetes-attributable mortality to lie between 5.1% of total mortality (3.3 million deaths) and 10.1% of total mortality (6.6 million deaths). The highest rates of diabetes-attributable mortality were found to be 25.7% in South-East Asian women aged between 50 and 59 years old. The highest number of deaths attributable to diabetes was found in countries with large populations: 1271,000 in China, 1065,000 deaths in India, 386,400 in Indonesia, 197,300 in the Russian Federation and 192,700 in the United States of America.

CONCLUSIONS

Overall, 1 in 12 of global all-cause deaths were estimated to be attributable to diabetes in adults. In general, the number and proportion of deaths was slightly higher in women than in men.

16-year excess all-cause mortality of newly diagnosed type 2 diabetic patients: a cohort study

Background

Studies have shown that type 2 diabetic patients have higher all-cause mortality than people without diabetes, but it is less clear how diabetes affects mortality in elderly patients and to what degree mortality differs between diabetic men and women. The aim of the present study is to investigate the age- and sex-specific all-cause mortality pattern in patients with type 2 diabetes in comparison with the Danish background population.

Methods

Population-based cohort study of 1323 patients, diagnosed with clinical type 2 diabetes in 1989-92 and followed for 16 years. Median (interquartile range) age at diagnosis was 65.3 (55.8-73.6) years. The age- and sex-specific hazard rates were estimated for the cohort using the life table method and compared with the expected hazard rates calculated with Danish register data from the general population.

Results

In comparison with the general population, diabetic patients had a 1.5-2.5 fold higher risk of dying depending on age. The over-mortality was higher for men than for women. It decreased with age in both sexes, and among patients over 80 years at diagnosis the difference between the observed and the expected survival was small.

Conclusion

We found an excess mortality of type 2 diabetic patients compared with the background population in all age groups. The excess mortality was most pronounced in men and in young patients.

Global burden of disease attributable to diabetes mellitus in Brazil

Type II diabetes mellitus accounts for 90% of all cases of diabetes, and its inclusion in health evaluation has shown that its complications have a considerable impact on the population's quality of life. The current article presents the results of the Global Burden of Disease Study in Brazil for the year 1998, with an emphasis on diabetes mellitus and its complications. The indicator used was disability-adjusted life years (DALY), using a discount rate of 3%. In Brazil, ischemic heart disease, stroke, and diabetes accounted for 14.7% of total lost DALYs. Brazil showed a higher proportion of years lived with disability (YLDs) among total DALYs for diabetes as compared to other countries. Retinopathy and neuropathy were the complications that contributed most to YLDs. According to forecasts, diabetes mellitus will have an increasing impact on years of life lost due to premature death and disability in the world, shifting from the 11th to 7th cause of death by 2030. It is thus urgent to implement effective measures for prevention, early diagnosis, counseling, and adequate follow-up of patients with diabetes mellitus.

Cardiovascular risk profile and morbidity in subjects affected by type 2 diabetes mellitus with and without diabetic foot

Diabetic foot syndrome (DFS) is the most frequent cause of hospitalization of diabetic patients and one of the most economically demanding complications of diabetes. People with diabetes have been shown to have higher mortality than people without diabetes. On this basis, the aim of our study was to evaluate the possible role of diabetic foot as a cardiovascular risk marker in patients with type 2 diabetes mellitus. We enrolled 102 consecutive patients with type 2 diabetes mellitus with diabetic foot and 123 patients with type 2 diabetes mellitus without limb lesions to compare the prevalence of main cardiovascular risk factors, subclinical cardiovascular disease, previous cardiovascular morbidity, and incidence of new vascular events on a 5-year follow-up. Diabetic patients with diabetic foot were more likely to have a higher prevalence of cardiovascular risk factors such as hypercholesterolemia, hypertriglyceridemia, hyperuricemia, and microalbuminuria or proteinuria, a higher prevalence of a previous cardiovascular morbidity (coronary artery disease, transient ischemic attack/ischemic stroke, diabetic retinopathy), and a higher prevalence of subclinical cardiovascular disease. Furthermore, diabetic patients with foot ulceration showed, on a 5-year follow-up, a higher incidence of new-onset vascular events (coronary artery disease, transient ischemic attack/ischemic stroke, diabetic retinopathy). At multivariate analysis, duration of diabetes, age, hemoglobin A1c, and DFS maintained a significant association with cardiovascular morbidity; but DFS presence showed the highest hazard ratio.

Early mortality from the time of diagnosis of Type 2 diabetes: a 5-year prospective cohort study with a local age- and sex-matched comparison cohort

AIMS

To study patterns and predictors of early mortality in individuals with a new diagnosis of Type 2 diabetes, compared with a local age- and sex-matched comparison cohort.

METHODS

A total of 736 individuals diagnosed with Type 2 diabetes between 1 May 1996 and 30 June 1998 and non-diabetic age- and sex-matched control subjects were studied. Follow-up was 5.25 years. Age- and gender-specific all-cause mortality odds ratios were calculated for the diabetic cohort compared with the non-diabetic comparator group. Mortality odds ratios were ascertained using conditional logistic regression.

RESULTS

There were 147 deaths in the diabetic cohort [cardiovascular (42.2%), cancer (21.1%)]. Compared with the non-diabetic cohort, mortality odds more than doubled [odds ratio (OR) 2.47; 95% confidence interval (CI) 1.74, 3.49]. These increased odds were present in all age bands (including those aged > 75 years at diagnosis) for both cardiovascular and non-cardiovascular causes. In women, a new diagnosis of Type 2 diabetes was associated with a sevenfold increase in mortality odds in those aged 60-74 years (OR 7.00; 95% CI 2.09, 23.47).

CONCLUSIONS

Type 2 diabetes is associated with a 2.5-fold increase in the odds of mortality in both men and women over the first 5 years from diagnosis. Our data strongly support the contention that the mortality risk associated with Type 2 diabetes essentially exists from, or may even predate, the time of diagnosis.

In a population-based cohort of diabetes patients, men and women had similar risks for all-cause mortality

OBJECTIVES

To compare death rates of diabetic men and women relative to the general population and to identify sex-specific risk factors for all-cause mortality.

STUDY DESIGN AND SETTINGS

In the current historical prospective cohort study, standardized mortality ratios (SMRs) were calculated for 19,657 men and women with diabetes in a large Israeli health care organization compared to the mortality in the general population from 1999 to 2003. In addition, sex-specific survival analyses were performed for men and women separately using baseline data obtained between 1995 and 1999.

RESULTS

During the study follow-up (90,899 person-years), 2,924 deaths were identified. The SMR for diabetic women (1.40; 95% confidence interval [CI]: 1.33, 1.47) was significantly (P<0.01) higher than for diabetic men (1.20; 95% CI: 1.14, 1.26). Age, glycated hemoglobin, serum creatinine, low-density lipoprotein, high-density lipoprotein, dialysis, use of angiotensin-converting enzyme inhibitors, and insulin were similarly associated with mortality in both sexes. Residing in the south of Israel was related with higher risk among men but with decreased risk among women.

CONCLUSIONS

The study indicates that diabetes seems to eliminate the relative protection against death usually seen in women. It also suggests that most risk factors are comparable between the sexes, underlining the importance of similarly intensive disease management in diabetic women and in diabetic men.

Assessment of cardiovascular disease risk factors and diabetes mellitus in Australian prisons: is the prisoner population unhealthier than the rest of the Australian population?

INTRODUCTION

This paper compares the prevalence estimates of diabetes and cardiovascular disease (CVD) risk factors in the Indigenous and non-Indigenous New South Wales (NSW) prisoner population in 1996 and 2001, and also compares the 2001 prevalence estimates with Australian population data.

METHODS

In 1996 and 2001, 789 and 916 prisoners, respectively, in NSW underwent a face-to-face interview covering behavioural risks and physical and mental health. Weight, height and blood pressure were recorded and blood was taken for measurement of cholesterol and random blood sugar.

RESULTS

The prevalence of hypertension, hypercholesterolaemia and smoking were lower in the 2001 prison survey as compared with the 1996 survey but the prevalence of smoking was extremely high in both the prison surveys (88% in 1996 and 79% in 2001). There were no differences in the age and sex-adjusted prevalence estimates for any condition except that the prison sample had a higher standardised morbidity ratio for angina than the AusDiab population.

CONCLUSION

This study highlights the high prevalence of CVD risk factors, particularly in younger prisoners, when compared with the Australian non-prison population.

IMPLICATIONS

Programs should be put in place to routinely screen for chronic disease conditions and to educate Australian prisoners regarding CVD and diabetes risk factors and their long-term management.

Reduced cardiovascular morbidity and mortality associated with metformin use in subjects with Type 2 diabetes

AIM

Metformin therapy reduces microvascular complications in Type 2 diabetes; questions remain, however, regarding its impact on macrovascular events. This study examined metformin use in relation to risk of cardiovascular-related hospitalization and mortality.

METHODS

We conducted a retrospective cohort analysis, using Saskatchewan Health administrative databases to identify new users of oral antidiabetic drugs. Subject groups were defined by medication use during 1991-1999: sulphonylurea monotherapy, metformin monotherapy, or combination therapy. Deaths and non-fatal hospitalizations recorded during the study period were identified as cardiovascular-related from ICD-9 codes. The main outcome was a composite of first non-fatal hospitalization or death. Standard multivariate techniques, including propensity scores, were used to adjust for potential confounding. Multivariate Cox proportional hazard models were used to examine the relationship between metformin use and the composite endpoint.

RESULTS

Metformin monotherapy was associated with a lower risk of the composite endpoint (adjusted hazard ratio 0.81; 95% confidence interval 0.68, 0.97) compared with sulphonylurea monotherapy. Combination therapy with meformin and a sulphonylurea was associated with lower mortality, but had similar hospitalization rates, to sulphonylurea monotherapy.

CONCLUSIONS

Metformin monotherapy was associated with a lower risk of cardiovascular-related morbidity and mortality, and combination metformin and sulphonylurea therapy was associated with a reduced risk of fatal cardiovascular events, when compared with sulphonylurea monotherapy.

Renal damage in patients with Type 2 diabetes: a strong predictor of mortality

AIMS

(i) To compare mortality rates in a cohort of Type 2 diabetic patients with those of the general population; (ii) to assess the prognostic role of pre-existing chronic conditions; (iii) to evaluate the impact of different severity of renal damage on mortality.

METHODS

All 3892 patients with Type 2 diabetes attending our Diabetic Clinic during 1995 and alive on 1 January 1996 were identified and followed for 4.5 years. Information on vital status (100% complete) and causes of death (98.5% complete) for 599 deceased subjects was derived from death certificates.

RESULTS

In comparison with the general population, standardized mortality ratios (x 100) were: 125 (95% confidence interval 104-148) in patients aged < 75 and 85 (75-95) in patients > or = 75 years. Cardiovascular diseases and diabetes were responsible for most of the excess deaths. In a Cox-proportional hazard model, renal damage was a powerful predictor of death (hazard ratio = 2.39; 95% confidence intervals = 2.00-2.85). The severity of renal damage was associated with increasing hazard ratios for death from all-cause mortality and from specific causes (especially coronary artery disease, other cardiovascular causes and diabetes) after multiple adjustments. Other significant predictors of death were: greater age, glycated haemoglobin, smoking, lower body mass index, pre-existing coronary and peripheral artery disease and known co-morbidity (cirrhosis and cancer).

CONCLUSIONS

Renal damage of any severity is significantly associated with subsequent mortality from all causes and from cardiovascular diseases. These associations are not confounded by pre-existing co-morbidity or coronary diseases.

O desafio da aplicação da metodologia de captura-recaptura na vigilância do diabetes mellitus em idosos: lições de uma experiência no Brasil

O presente estudo buscou avaliar a factibilidade da implantação de um sistema de vigilância do diabetes mellitus na população idosa, empregando para tal fontes de dados sobre morbidade (hospitalar e ambulatorial) e mortalidade e a metodologia de captura-recaptura. Modelos loglineares foram ajustados para o conjunto da amostra e nos estratos formados pelo sexo e a faixa etária. Setecentos e quarenta pacientes foram identificados no conjunto das fontes. O modelo selecionado para o conjunto da amostra estimou um total de 22.925 casos (IC90%: 11.354-57.269), que é implausivelmente elevado sugerindo uma forte dependência negativa final entre as fontes. A estratificação segundo sexo e faixa etária levou a valores pontuais mais plausíveis, embora ainda imprecisos. O único estrato que apresentou valores precisos foi o de mulheres com 60 a 69 anos (1.290 casos; IC90%: 779-2.476). Os fatores que possivelmente explicam estes resultados são: (a) o número pequeno dos casos captados na fonte ambulatorial atendidos em unidades especializadas e de maior complexidade; (b) o sub-registro do diabetes.

Sustainability and effectiveness of comprehensive diabetes care to a district population

AIMS

To evaluate whether diabetes care in a district population can be sustained over time and intensive management of multiple risk factors can be achieved against a background of rising prevalence of known diabetes and shift of responsibility towards primary care.

METHODS

Assessment of process and outcome measures achieved by a comprehensive diabetes service. Routine data were collected from patients registered with diabetes in a district population by repeated cross-sectional survey in 1991 (n = 2284 patients) and 2001 (n = 5809 patients).

RESULTS

Between 1991 and 2001 the recording of body mass index (76.8 vs. 71.3%, P = 0.01) and HbA(1c) measurement (92.2 vs. 86.4%, P < 0.001) decreased, whereas recording of smoking status (72.4 vs. 82%, P < 0.001), cholesterol level (54.7 vs. 82.5%, P < 0.001) and eye screening result (86.1 vs. 91.3%, P < 0.001) improved. Surviving patients with Type 2 diabetes had significant improvements in systolic blood pressure, diastolic blood pressure and cholesterol, significant deterioration in HbA(1c) and creatinine, and no change in body mass index. Changes in blood pressure and HbA(1c) over time were similar to those reported in the UKPDS.

CONCLUSIONS

The delivery of processes and outcomes of care to a district population can be sustained at a high level over a 10-year period within a comprehensive diabetes service. We would suggest that a multifaceted complex intervention is required to achieve these results.

Greater effect of enhanced pharmacist care on cholesterol management in patients with diabetes mellitus: a planned subgroup analysis of the Study of Cardiovascular Risk Intervention by Pharmacists (SCRIP)

STUDY OBJECTIVE

To determine the effect of enhanced pharmacist care on cholesterol management in patients with and without diabetes mellitus.

METHODS

We conducted a planned subgroup analysis of the Study of Cardiovascular Risk Intervention by Pharmacists (SCRIP), a 54-center randomized trial of pharmacist intervention compared with usual care in patients at high risk for cardiovascular events. The patients involved had atherosclerotic disease or diabetes. We compared the effect of pharmacist intervention in patients with and without diabetes. The primary end point was a composite of performing a fasting cholesterol profile, or adding or increasing the dosage of a cholesterol-lowering drug. Secondary end points were individual components of the primary end point and change in 10-year risk for cardiovascular events, using the Framingham risk equation.

RESULTS

Of the 675 patients enrolled in the SCRIP study, 294 (44%) had diabetes. Enhanced pharmacist care had a more beneficial effect on cholesterol management in those with diabetes (odds ratio [OR] 4.8) than without diabetes (OR 2.1), p=0.01. Secondary end points showed similar trends, and reduction in Framingham risk was greater in patients with diabetes than without.

CONCLUSION

Pharmacist intervention for dyslipidemia appears to have a greater impact in patients with diabetes. Results of this substudy suggest that pharmacists should target this patient group for interventions in cholesterol risk management.

The prevalence of coronary heart disease in Type 2 diabetic patients in Italy: the DAI study

AIMS

Type 2 diabetes is associated with at least a twofold increase in risk of coronary heart disease (CHD). We aimed to estimate the prevalence of CHD in the population of Type 2 diabetics cared for by the Italian network of outpatient diabetic units.

METHODS

The DAI (Diabetes and Informatics study group, Italian Association of Diabetologists, and Italian National Institute of Health) study is a multicentre cohort study of patients with Type 2 diabetes. Patients were classified as having CHD if they had: (i) a history for hospital admission for either an acute myocardial infarction (AMI) or angina; (ii) a positive ECG for prior AMI or angina; (iii) a positive history for coronary artery bypass graft; or (iv) a positive history for percutaneous transluminal coronary angioplasty.

RESULTS

A cohort of 19 468 patients was analysed: 3157 patients had CHD. The majority of events (80%) had occurred after the diagnosis of diabetes and were considered in the CHD prevalence estimate. The prevalence of CHD, adjusted by age and sex, was 9.9%: 11.0% male and 9.0% female. Angina without AMI occurred in 1306 patients; this condition was more frequent in females while a documented AMI was more frequent in males. Therapeutic procedures were performed more frequently in males. A positive association with CHD was found for gender, age at visit, duration of diabetes, hypertension, relatives with CHD, tryglicerides and microvascular complications.

CONCLUSIONS

The prevalence of CHD in this cohort is lower than previously reported; nevertheless, patients attending the diabetic care units may not be fully representative of the general diabetic population in Italy. Revascularization is less frequent in females than in males; microvascular complications and a worse metabolic control are significantly associated with CHD.

Cause-specific and total mortality in the Canterbury (New Zealand) insulin-treated Diabetic Registry population: a 15-year follow-up study

AIMS

To establish all-cause and cause-specific death rates, and risk factors for mortality in insulin-treated diabetic individuals living in the province of Canterbury, New Zealand.

METHODS

Insulin-treated diabetic subjects (n = 995) on the Canterbury Diabetes Registry were followed up over 15 years and vital status determined. Death rates were standardized and hazard regression was used to model the effects of demographic covariates on relative survival time.

RESULTS

There were 419 deaths in 11 226.3 person-years of follow-up with a standardized mortality ratio (SMR) of 2.0 (95% confidence interval (CI) 1.8-2.2). Relative mortality was greatest for the group aged 0-29 years (SMR 3.0 (95% CI 2.4-3.7)). After controlling for diabetes duration and gender, a 10-year increment in age of onset was associated with a 33% decrease in relative hazard (95% CI 29-36%), indicating that excess mortality due to diabetes declines with rising age of onset. After controlling for age of onset and gender, each 10-year increment in duration of diabetes is associated with a 26% decrease in relative hazard (95% CI 24-29%), indicating that with longer survival the mortality hazard approaches the general population hazard. Relative mortalities were increased for cardiovascular, renal and respiratory disease, but not malignancy. Relative mortality from acute metabolic complications was increased in the subgroup with age of onset of diabetes < 30 years and requiring insulin within 1 year of diagnosis.

CONCLUSIONS

Mortality rates are high for insulin-treated diabetic individuals relative to the general population.

[Diabetes mellitus mortality among elderly as an underlying or secondary cause of death]

OBJECTIVE

To analyze diabetes mellitus-related mortality among elderly and the rate of undereporting of diabetes mellitus as a cause of death when statistical data on diabetes exclusively on the underlying cause of death are considered.

METHODS

A total of 2.974 death certificates of elderly people living in a housing project in the city of Rio de Janeiro were revised. The study period was 1994. Of them, 291 deaths were due to diabetes mellitus, 150 as the underlying and 141 as the secondary cause of death. The proportion of deaths where diabetes was stated as the underlying cause in relation to the total of diabetes deaths was calculated globally and categorized by sex and age groups.

RESULTS

Of the 291 deaths studied, 138 (47.4%) were men and 153 (52.6%) were women. Mortality rates showed a continuous age increase and were higher among men, though sex difference was smaller when only the underlying cause was considered. It was found a higher proportion of deaths (22%) occurring at home. Overall rate of diabetes deaths as the underlying cause was 51.5%, with higher rates seen in women.

CONCLUSIONS

The analysis of mortality statistics based exclusively on the underlying cause of death can yield misleading profiles due to unrandomized underreporting. There is a need of further studies with diabetic elderly cohorts for a more accurate mortality analysis in this population group.

Cause-specific mortality in a population with diabetes: South Tees Diabetes Mortality Study

OBJECTIVE

To describe the mortality of a population with diabetes compared with the local nondiabetic population, using age-, sex-, and cause-specific death rates and relative and absolute differences in death rates.

RESEARCH DESIGN AND METHODS

A population-based cohort of 4,842 people with diabetes living within South Tees, U.K., was identified and followed from 1 January 1994 to 31 December 1999. Causes of death were obtained from death certificates, and mortality rates were compared with the nondiabetic population of the same area for the same time period.

RESULTS

There were 1,205 deaths (24.9%) in the study population during the 6 years of study. For type 2 diabetes, mortality from cardiovascular causes was significantly increased in both sexes and at all ages. Relative death rates for the age band 40-59 years were 5.47 (95% CI 4.18-7.15) for men and 5.60 (3.44-9.14) for women. The relative death rates declined with age for both sexes, but absolute excess mortality increased with age. There were no consistent differences in noncardiovascular death rates, other than for renal disease. Similar outcomes were found for type 1 diabetes, although these results were limited by a much smaller population size. People with diabetes and renal impairment had significantly higher mortality than people with diabetes alone, with a rate ratio of 7.27 for people with type 2 diabetes aged 40-59 years.

CONCLUSIONS

In an area of the U.K. with high cardiovascular death rates, people with diabetes had significantly higher cardiovascular death rates than people without diabetes. Interventions targeted at cardiovascular risk factors should be used to try and reduce this excess premature mortality, which is especially high in those with renal impairment.

Excess mortality in a population with diabetes and the impact of material deprivation: longitudinal, population based study

OBJECTIVES

To establish the age and sex specific mortality for people with diabetes in comparison with local and national background populations; to investigate the relationship between mortality and material deprivation in an unselected population with diabetes.

DESIGN

Longitudinal study, using a population based district diabetes register.

SETTING

South Tees, United Kingdom.

PARTICIPANTS

All people known to have diabetes living in Middlesbrough and Redcar and Cleveland local authorities on 1 January 1994.

MAIN OUTCOME MEASURE

Death, from any cause, between 1 January 1994 and 31 December 1999.

RESULTS

Over the six years of the study 1205 (24.9%) of 4842 participants died. All cause standardised mortality ratios for type 1 diabetes were 641 (95% confidence interval 406 to 962) in women and 294 (200 to 418) in men, and those for type 2 diabetes were 160 (147 to 174) in women and 141 (130 to 152) in men. Cause specific standardised mortality ratios were increased for ischaemic heart disease, cerebrovascular disease, and renal disease; no reductions in mortality from other causes were seen. The risk of premature death increased significantly with increasing material deprivation (P<0.001).

CONCLUSIONS

Diabetes is associated with excess mortality, even in an area with high background death rates from cardiovascular disease. This excess mortality is evident in all age groups, most pronounced in young people with type 1 diabetes, and exacerbated by material deprivation. Aggressive approaches to the management of cardiovascular risk factors could reduce the excess mortality in people with diabetes.

All-cause mortality in the Canterbury (New Zealand) insulin-treated Diabetic Registry population

OBJECTIVE

To establish all-cause death rates and life expectancies of and risk factors for mortality in insulin-treated diabetic individuals living in Canterbury, New Zealand.

RESEARCH DESIGN AND METHODS

Insulin-treated diabetic subjects (n = 1,008) on the Canterbury Diabetes Registry were tracked over 9 years, and their vital status was determined. Death rates were standardized using direct and indirect methods. Cox proportional hazard regression was used to model the effects of demographic and clinical covariates on survival time.

RESULTS

At study entry, age ranged from 2.9 to 92.7 years, with mean 48.7 +/- 20.4 years; age at diagnosis was 0.2-88.9 years, mean 34.5 +/- 20.0 years; and duration of diabetes was 0.1-58.5 years, mean 14.0 +/- 10.6 years. There were 303 deaths in 7,372 person-years of follow-up with a standardized mortality ratio (SMR) of 2.6 (95% CI 2.4-3.0). Relative mortality was greatest for those aged 30-39 years (SMR 9.2 [4.8-16.2]). The death rate for the diabetic cohort standardized against the Segi world standard population was 16.2 per 1,000. Attained age, sex, and clinical subtype were significant predictors of mortality The SMR for subjects with type 1 diabetes and age at onset <30 years was 3.7 (CI 2.7-5.0), 2.2 (1.8-2.6) for those with onset > or =30 years, and 3.1 (2.5-3.7) for subjects suspected of having latent autoimmune diabetes in adulthood or insulin-treated type 2 diabetes. Life expectancy was reduced for both sexes at all ages.

CONCLUSIONS

Mortality rates for insulin-treated diabetic individuals remain high, resulting in shortened life spans relative to the general population. Marked differences in mortality exist between clinical groups of subjects. Further research is needed to improve diabetes classification and to clarify differences in health outcomes.

Causes of death and associated factors among patients with non-insulin-dependent diabetes mellitus in Taipei, Taiwan

A cohort of 766 patients with non-insulin-dependent diabetes mellitus (NIDDM) from a general teaching hospital in Taipei, Taiwan were followed prospectively to assess survival experience and associated risk factors. Data were abstracted from the medical records and additional information was obtained from patients or their closest relatives using a structured questionnaire. Date and cause of death were determined from death certificates. Standardized mortality ratios were calculated by the direct method. Chi2-Square test and Cox's proportional hazard analysis were used to control for potential confounders. During a median follow-up of 3.5 years (range 1 month to 4.6 years), 131 deaths occurred. Of these, 29.8% were due to cardiopulmonary disease (ICD 401-429), 13.0% due to cerebrovascular disease (ICD 430-438), 13.0% due to acute diabetes metabolic complications (250.1, 250.2), and 11.4% due to nephropathy (580-589). Adjusted for age, people with NIDDM had 2.2 (95% CI 1.6-2.9) times the risk of death than members of the general population, and cause-specific standardized mortality ratios were: CPD 4.6, nephropathy 8.8, cerebrovascular disease 1.9, and neoplasm 0.7. Age, fasting plasma glucose, hypertension, and proteinuria were positively and independently associated with all-cause mortality (P < 0.05 for each). Thus, NIDDM patients have higher mortality rates than the general population in Taiwan, and age, fasting plasma glucose, hypertension, and proteinuria are associated with this excess risk. Proper application of available interventions may control these factors with a consequent reduction in mortality. Particular attention is needed to prevent deaths from the acute metabolic complications of diabetes.

Management of patients with diabetes after heart attack: a population-based study of 1982 patients from a heart disease register

BACKGROUND

Previous studies examining the management of patients with diabetes after acute myocardial infarction (AMI) have been based on clinical studies under experimental conditions. We used data from a population-based heart disease register to document differences in the management after AMI between patients with and without diabetes.

HYPOTHESIS

There were no differences in the prescription rates of aspirin, beta blockers, streptokinase, ACE inhibitors and calcium channel blockers between patients with and without diabetes admitted to hospital with AMI.

METHODS

A retrospective study of 268 patients with, and 1714 patients without, diabetes discharged from hospital with 'definite' AMI between August 1988 and March 1994.

RESULTS

The prescription rates of all five drug classes increased between 1988 and 1994 both for patients with and without diabetes. Patients with diabetes were significantly less likely to have been prescribed aspirin (76% vs 85%), beta blockers (41% vs 53%) and streptokinase (25% vs 43%) but more likely to have been prescribed ACE inhibitors (47% vs 29%) and calcium channel blockers (50% vs 40%). The differences in prescription rates were statistically significant after controlling for age, sex, history of ischaemic heart disease, smoking status, educational level and disease severity.

CONCLUSION

Patients with diabetes were less likely to have been prescribed three of the five drug classes where evidence points to a beneficial effect after AMI. Further work is needed to identify the reasons for the disparity between management of patients with and without diabetes, and to develop effective strategies to increase the implementation of best practice guidelines in the management of patients with diabetes after AMI.