Association between urinary cadmium levels and prediabetes in the NHANES 2005–2010 population

Evidence suggests an association between exposure to cadmium and dysglycemia. To investigate this matter, we examined the relationship between urinary cadmium and prediabetes in the cross sectional National Health and Nutrition Examination Survey (NHANES). NHANES participants for the years 2005 through 2010 aged ≥40 years were included in the analysis. Participants with nephropathy, overt diabetes, or missing required data were excluded. To assess the non-linear relationship between cadmium and Prediabetes, non-parametric logistic regression with B spline expansion of urinary cadmium/creatinine ratio was performed. This analysis revealed a complex non-linear association between higher cadmium levels and prediabetes. This relationship persisted, though with varying magnitudes across smoking groups (never smokers, moderate smokers, heavy smokers). In a conventional logistic regression analysis, this relationship was less evident with significantly increased OR for prediabetes was found in the highest quintile of urine cadmium compared to the lowest quintile in the overall population and in moderate smokers. In an age stratified analysis, a significant linear association was found only in the age groups 60–69 and ≥70. We conclude that there is a significant non-linear, complex relationship between urinary Cd levels, age, smoking habits and odds of prediabetes.     

Prevalence and predictors of postpartum glucose intolerance in Italian women with gestational diabetes mellitus

Aims

To determine the prevalence of both prediabetes and type 2 diabetes mellitus (T2DM) by postpartum oral glucose tolerance test (ppOGTT) in Italian women diagnosed with gestational diabetes mellitus (GDM), and identify antepartum predictors of glucose intolerance.

Methods

Retrospective study of 454 Caucasian women that underwent a 75 g OGTT between 6 and 12 weeks postpartum in Calabria (Southern Italy) between 2004 and 2012. Prediabetes and T2DM were diagnosed according to the American Diabetes Association (ADA) criteria. Data were examined by univariate analysis and multiple regression analysis.

Results

290 women (63.9%) were normal, 146 (32.1%) had prediabetes (85 impaired fasting glycemia; 61 impaired glucose tolerance), and 18 (4.0%) had T2DM. Of the continuous variables, pre-pregnancy body mass index (BMI), age at pregnancy, fasting plasma glucose (FPG) at gravid OGTT, and week at diagnosis of GDM were associated with prediabetes and T2DM, whereas the parity was associated with T2DM only. For categorical traits, pre-pregnancy BMI ≥25 and previous diagnosis of polycystic ovary syndrome (PCOS) emerged as the strongest predictors of prediabetes whereas the strongest predictors of T2DM were FPG ≥100 mg/dl (5.6 mmol/l) at GDM diagnosis and pre-pregnancy BMI ≥25. Moreover, FPG at GDM screening was a good predictor of T2DM after receiver-operating-characteristic analysis.

Conclusions

Our findings confirm the high prevalence of glucose intolerance in the early postpartum period in women with previous GDM. PCOS emerges as a new strong antepartum predictor of prediabetes.     

Prevalence and progression of carbohydrate disorders in patients with pheochromocytoma/paraganglioma: retrospective single-center study

BackgroundCarbohydrate disorders are the most frequent metabolic disorders, affecting a significant proportion of patients with pheochromocytoma.ObjectiveA retrospective study assessed the prevalence and progression of carbohydrate disorders in 204 patients (92 men, 112 women) with histologically proven pheochromocytoma diagnosed in a single specialized tertiary center during a 40-year period (1978–2017). One hundred were followed-up after tumor removal.ResultsCarbohydrate disorders were diagnosed in 49.5% of cases: 30.4% with diabetes and, 19.1% prediabetes. Subjects with carbohydrate disorders had significantly greater age at diagnosis and higher 24-hour urine metanephrine and normetanephrine concentrations than those with normal glucose tolerance. One-third of patients with diabetes achieved good glycemic control under oral treatment (54% on metformin monotherapy). One-third of patients overall required preoperative insulin treatment. Postoperative follow-up (100 patients; 5-year mean duration) showed reduced prevalence of diabetes (13% vs. 33%; P = 0.0007) and prediabetes (12% vs. 24%; P = 0.027). Almost 60% of subjects initially diagnosed with carbohydrate disorders recovered normal glucose tolerance after surgery; these subjects had significantly higher preoperative urine metanephrine/normetanephrine levels than those with persistent diabetes/prediabetes. Correlation analysis revealed a moderate negative relationship between urine metanephrine/normetanephrine concentration and the outcome of the carbohydrate disorders (Spearmen's Rho = − 0.507; P = 0.013). There was no significant difference according to pre- or postoperative prevalence of obesity (15% vs. 16%; P = 0.845) or dyslipidemia (46% vs. 39%; P = 0.316).ConclusionsCarbohydrate disorders affect approximately 50% of pheochromocytoma patients; 30% develop overt diabetes, which may be the only clinical manifestation in some rare cases. Pheochromocytoma-related diabetes is more likely to affect patients with predominant adrenaline secretion. It is often easy to control and usually requires oral antidiabetic treatment. Reversibility of carbohydrate disorders depend on severity, preoperative metanephrine level, age and weight.     

Glucoregulatory function among African Americans and European Americans with normal or pre-diabetic hemoglobin A1c levels

Objective

A hemoglobin (Hb) A1c range of 5.7%–6.4% has been recommended for the diagnosis of prediabetes. To determine the significance of such “prediabetic” HbA1c levels, we compared glucoregulatory function in persons with HbA1c levels of 5.7%–6.4% and those with HbA1c < 5.7%.

Methods

We studied 280 nondiabetic adults (142 black, 138 white; mean (± SD) age 44.2 ± 10.6 years). Each subject underwent clinical assessment, blood sampling for HbA1c measurement, and a 75-g oral glucose tolerance test at baseline. Additional assessments during subsequent outpatient visits included insulin sensitivity, using homeostasis model assessment (HOMA)-IR and the hyperinsulinemic euglycemic clamp; insulin secretion, using HOMA-B and frequently samples intravenous glucose tolerance test (FSIVGTT) and disposition index (DI); and measurement of fat mass, using DXA.

Results

Compared to subjects with HbA1c < 5.7%, persons with HbA1c levels of 5.7%–6.4% were older, and had higher body mass index (BMI) and insulin secretion but similar insulin sensitivity. When the two groups were matched in age and BMI, persons with HbA1c 5.7%–6.4% were indistinguishable from those with HbA1c < 5.7% with regard to all measures of glycemia and glucoregulatory function.

Conclusions

Unlike glucose-defined prediabetes status, an HbA1c range of 5.7%–6.4% does not reliably identify individuals with impaired insulin action or secretion, the classical defects underlying the pathophysiology of prediabetes. Thus, HbA1c cannot validly replace blood glucose measurement in the diagnosis of prediabetes. If utilized as a screening test due to convenience, aberrant HbA1c values should be corroborated with blood glucose measurement before therapeutic intervention.     

Impact of unknown diabetes and prediabetes on clinical outcomes in “nondiabetic” Chinese patients after a primary coronary intervention

Background and aimTo explore the prevalence of unknown diabetes (DM) or prediabetes (pre-DM) in “nondiabetic” patients and its association with 2-year clinical outcomes after primary percutaneous coronary intervention (PCI).Methods and results5202 consecutive “nondiabetic” patients who underwent primary PCI at Fuwai Hospital from January to December 2013 were prospectively enrolled. The patients were grouped according to their glycemia status: unknown DM (HbA1c ≥ 47 mmol/L; FPG≥ 7.0 mmol/L), pre-DM (HbA1c 39–47 mmol/L; FPG: 5.6–6.9 mmol/L) and normoglycemia (NG, HbA1c < 39 mmol/L; FPG < 5.6 mmol/L). The main endpoint was 2-year major adverse cardiovascular events (MACE), including cardiac death, myocardial infarction, and target vessel revascularization. A total of 905 patients had unknown DM, and 3407 patients had pre-DM. Unknown DM and pre-DM were associated with aging (p < 0.001); a greater proportion of hypertension (p < 0.001), previous myocardial infarction (p < 0.001), and chronic kidney disease (p = 0.004). During the 2-year follow-up, the rate of MACE was significantly higher in the unknown DM and pre-DM groups than in the NG group (8.1% vs. 5.8% vs. 4.1%, respectively, p = 0.001). Multivariate analyses demonstrated that unknown DM was associated with a 1.9-fold higher event risk compared to NG (95% CI: 1.2–2.8).ConclusionsThe prevalence of abnormal glucose metabolism was high in “nondiabetic” Chinese PCI patients. Patients with unknown DM and pre-DM had higher event risks than those with NG. In “nondiabetes” patients requiring PCI, routine assessment of HbA1c and FPG appears to be of value to identify patients with an increased event risk.     

National trends in insulin resistance and β-cell dysfunction among adults with prediabetes: NHANES 2001-2016

Background::Insulin resistance is the central abnormality and mechanism underlying the progression of cardiometabolic-based chronic diseases. This study aimed t...     

Burning sensation in the feet and glycosylated haemoglobin levels in Swedish- and non–Swedish-born primary healthcare patients

BackgroundA painful burning sensation in the feet is a common problem. The most common cause is small fibre neuropathy, a type of peripheral neuropathy that is often a consequence of diabetes and prediabetes.AimTo examine the association between a self-reported burning sensation in the feet and HbA1c levels in primary healthcare patients.MethodsThis study used data from patients in the 4D diabetes project in Swedish primary healthcare. The study population included 824 patients. Logistic regression was performed to study the association between the outcome and explanatory variables.ResultsA total of 24% of patients reported a burning sensation in the feet. This sensation was not associated with HbA1c levels. However, the probability of reporting a burning sensation was two times higher in non-Swedish-born than Swedish-born patients (OR, 2.31; 95% CI, 1.55–3.44) and higher in smokers than those who had never smoked, regardless of region of birth (OR, 1.69; 95% CI, 1.07?2.65).ConclusionsOur results do not support the hypothesis that a self-reported burning sensation in the feet is associated with HbA1c levels. Rather, they indicate a strong relationship between a burning sensation and region of birth, as well as between a burning sensation and smoking.     

2007年成都地区糖尿病、糖尿病前期的流行病学调查

目的了解成都地区成年人DM和DM前期患病率的流行病学情况。方法用多级多层整体抽样方法,于2007年调查成都玉林、龙泉两个地区共计2248人。DM诊断采用1999年WHO标准。结果DM和DM前期的总患病率分别为11．1％、14．2％;标化后分别为8．2％、12．2％;男性DM患病率高于女性（P〈0．05）,两性问DM前期患病率无统计学差异（P〉0.05）。DM及DM前期患病率随年龄增长而增加（P〈0．05）。Logistic回归分析显示DM的危险因素有年龄、腰围、静息心率、BP和TG。DM前期危险因素分别为年龄、高血压史、静息心率、BMI、TC、血尿酸。HDL-C为保护性因素。结论成都地区的DM及DM前期患病率均较高,且有进一步增加趋势,须及时采取有效措施,干预糖代谢异常的流行。     

Glucose challenge test screening for prediabetes and undiagnosed diabetes

Aims/hypothesis  Diabetes prevention and care are limited by lack of screening. We hypothesised that screening could be done with a strategy similar to that used near-universally for gestational diabetes, i.e. a 50 g oral glucose challenge test (GCT) performed at any time of day, regardless of meal status, with one 1 h sample. Methods  At a first visit, participants had random plasma and capillary glucose measured, followed by the GCT with plasma and capillary glucose (GCTplasma and GCTcap, respectively). At a second visit, participants had HbA_1c measured and a diagnostic 75 g OGTT. Results  The 1,573 participants had mean age of 48 years, BMI 30.3 kg/m² and 58% were women and 58% were black. Diabetes (defined by WHO) was present in 4.6% and prediabetes (defined as impaired glucose tolerance [2 h glucose 7.8–11.1 (140–199 mg/dl) with fasting glucose ≤6.9 (125 mg/dl)] and/or impaired fasting glucose with plasma glucose 6.1–6.9 mmol/l [110–125 mg/dl]) in 18.7%. The GCTplasma provided areas under the receiver-operating-characteristic curves of 0.90, 0.82 and 0.79 for detection of diabetes, diabetes or prediabetes, and prediabetes, respectively, all of which were higher than GCTcap, random and capillary glucose, and HbA_1c (p < 0.02 for all). The performance of GCTplasma was unaffected by time after meals or time of day, and was better in blacks than whites, but otherwise comparable in men and women, and in groups with differing prevalence of glucose intolerance. GCTplasma screening would cost approximately US$84 to identify one person with previously unrecognised diabetes or prediabetes. Conclusions/interpretation  GCT screening for prediabetes and previously unrecognised diabetes would be accurate, convenient and inexpensive. Widespread use of GCT screening could help improve disease management by permitting early initiation of therapy aimed at preventing or delaying the development of diabetes and its complications. Electronic supplementary material  The online version of this article (doi:) contains supplementary material, which is available to authorised users.