[Management of diabetic mellitus in low-income rural patients]

Comparison of Health Status in Primary Care Underserved Area Residents and the General Population in Korea

Background

This study compared chronic diseases and health-related quality of life (HRQoL) in between primary care underserved areas residents and the general population.

Methods

Underserved areas were identified according to accessibility and the time relevance index for primary care. Overall, 279 participants aged ≥60 years from four counties enrolled voluntarily. A total of 1,873 individuals were assigned in the control group using the Korea National Health and Nutrition Examination Survey database. We assessed the differences in prevalence, awareness, and control of hypertension and diabetes and HRQoL using both subjective health status and the Korean version of the EuroQol-5D (EQ-5D) questionnaire using multivariate logistic regression analysis between the two groups.

Results

For hypertension, prevalence did not differ significantly between the two groups, whereas awareness and control were lower in the underserved areas than that in the general population; the adjusted odds ratios (95% confidence interval) were 0.40 (0.25–0.64) and 0.27 (0.18–0.41), respectively. For diabetes, differences in prevalence, awareness, and control were statistically insignificant. The proportion reporting poor subjective health status and problems in four EQ-5D indexes (ability to exercise, daily activities, pain/discomfort, anxiety/depression) was higher in the underserved areas, which also had a lower EQ-5D index, than that in the general population.

Conclusion

Primary care underserved area residents were underdiagnosed and under-controlled for hypertension and reported poorer subjective health and HRQoL compared to the general population. Primary care is the attributable factor to awareness and control of chronic diseases and subjective health and QoL in communities.

The HbA1c and all-cause mortality relationship in patients with type 2 diabetes is J-shaped: a meta-analysis of observational studies

BACKGROUND

Low blood glucose and HbA1c levels are recommended in the literature on management of diabetes. However, data have shown that low blood glucose is associated with serious adverse effects for the patients and the recommendation has been criticized. Therefore, this article revisits the relationship between HbA1c and all-cause mortality by a meta-analysis of observational studies.

AIM

The aim of this study is to determine whether there is a J- or U-shaped non-linear relationship between HbA1c and all-cause mortality in type 2 diabetes patients, implying an increased risk to premature all-cause mortality at high and low levels of HbA1c.

METHODS

A comprehensive literature search was conducted using PubMed, Medline, and Cochrane Library databases with strict inclusion/exclusion criteria. The published adjusted hazard ratios (HR) with 95% confidence intervals of all-cause mortality for each HbA1c category and per study were analyzed. Fractional polynomial regression was used with random effect modeling to assess the non-linear relationship of the HR trends between studies. Seven eligible observational studies with a total of 147,424 participants were included in the study.

RESULTS

A significant J-shaped relationship was observed between HbA1c and all-cause mortality. Crude relative risk for all-cause mortality identified a decreased risk per 1% increase in HbA1c below 7.5% (58 mmol/mol) (0.90, CI 0.86-0.94) and an increased risk per 1% increase in HbA1c above 7.5% (58 mmol/mol) (1.04, CI 1.01-1.06). Observational studies revealed a J-shaped relationship between HbA1c and all-cause mortality, equivalent to an increased risk of mortality at high and low HbA1c levels.

CONCLUSIONS

This increased mortality at high and low HbA1c levels has significant implications on investigating optimum clinical HbA1c targets as it suggests that there are upper and lower limits for creating a 'security zone' for diabetes management.