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Query: UMLS:C0011849 (diabetes)
 277,896 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The minor hemoglobins AIa, AIb, and AIc were studied in mice with either genetic or chemically induced diabetes. Hemoglobin AIc was elevated approximately twofold in all the phenotypically diabetic mice studied (C57BL/KsJ-db/db, C57BL/KsJ-ob/ob, C57BL/6J-db/db, and alloxan- and streptozotocin-treated mice). Elevation of the hemoglobin AIc in C57BL/6J-db/db mice was of short duration, reflecting the transitory diabetes characteristic of these mice. The degree of increase of hemoglobin AIc levels was unrelated to severity of hyperglycemia, duration of diabetes, age of mouse, or body weight. It is not known what factor(s) dictates the steady-state concentration of hemoglobin AIc.
Diabetes 1976 Jan
PMID:Increased hemoglobin AIc in diabetic mice. 12 80

Comprehensive ascertainment of all possible new cases of stroke appearing between January 1, 1970 and June 30, 1971, and admitted to three major hospitals in Winnipeg, Manitoba, has been achieved by reviewing the Manitoba Health Services Commission claim reports. The medical records of these cases were reviewed, pertinent data were abstracted, and rigid criteria for diagnosis were followed. Also, data were obtained from death certificates, autopsy reports and long-term hospital records. A total of 606 ascertained cases (410 infarction, 137 hemorrhage, and 59 undetermined type) were matched for age, sex, residence and year of admission with 606 controls from admissions for other than cardiovascular and cerebrovascular disorders. The data were analyzed for elucidating the possible risk factors for infarction (INF) and hemorrhage (HGE). The findings suggested that hypertension was the main risk factor in hemorrhage, whereas in infarction, along with hypertension, other factors such as diabetes, heart enlargement in chest x-ray, ECG abnormalities, and smoking were suggested as risk factors. There was an association also between infarction, on one hand, and the history of receiving anticoagulants, diuretics, and medications for the heart, and the occurrence of myocardial infarction, on the other hand. These features indicate that infarction and ischemic heart disease have similar risk factors. Hemoglobin and hematocrit were higher in infarction cases than in their controls only when measured at stroke admission. No difference was revealed when they were measured prior to stroke. Their association with infraction therefore may be secondary to other factors and of no significance for its risk.
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PMID:Relative role of factors associated with cerebral infarction and cerebral hemorrhage. A matched pair case-control study. 13 18

Hemoglobin A1c concentration (HbA1c) was compared to the plasma glucose responses at 1 and 2 h of an oral glucose tolerance test (OGTT) in 63 subjects preselected because of postprandial hyperglycemia. HbA1c concentrations were correlated with 1- and 2-hour plasma glucose responses during the OGTT (r = 0.776 and 0.8602, respectively). The OGTT responses were diabetic-like in 21, indeterminate in 15, and normal in 27 subjects. HbA1c values were within normal limits in all subjects who had a normal or indeterminate OGTT response and in 10 out of 21 with a diabetic OGTT. The 2-h OGTT response among the 10 diabetic responders with normal HbA1c was 200 +/- 31 mg/100 ml (mean +/- SD), while that of the 11 diabetic responders with elevated HbA1c was 352 +/- 122 mg/100 ml. All subjects with an elevated HbA1c had a 2-h plasma glucose above 228 mg/100 ml, whereas only 7% of subjects with a normal HbA1c had a 2-h glucose above this value. It is concluded that only about half of the patients currently diagnosed as having mild or chemical diabetes by OGTT have elevated HbA1c and that an elevated HbA1c is usually associated with 2-h OGTT levels above 228 mg/100 mg.
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PMID:Hemoglobin A1c levels in a diabetes detection program. 26 11

The average Hb A1c concentration in consecutive cases of newly discovered nonacidotic diabetics was 11.4% prior to diet and insulin, as compared to 5.5% following prolonged optimal control (p less than 0.001). Hemoglobin A1c was significantly correlated with fasting blood sugar. In a controlled study the average Hb A1c in 30 subjects with chemical diabetes was 5.8% as opposed to 5.3% in controls with normal OGTT (p less than 0.05). Thirty-seven percent of the chemical diabetics had Hb A1c values greater than or equal to 6.5%, while none in the control group showed such high values. Hb A1c in whole blood has increased oxygen affinity. A decrease in red-cell oxygen release was noted in some untreated nonacidotic diabetics, and an adverse effect of insulin on the oxygen release capacity was demonstrated in both newly diagnosed ketoacidotic and nonacidotic diabetics. The importance of this defect in red-cell oxygen-releasing capacity on the function of the microcirculation is discussed. Signs of an early breakdown of the blood-retinal barrier was demonstrated in 20% of the chemical diabetics by fluorescein angiography.
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PMID:Hemoglobin AIc and red cell oxygen release capacity in relation to early retinal changes in newly discovered overt and chemical diabetics. 40 May 64

Hemoglobin A1 concentrations were measured in 230 patients with diabetes mellitus. Diabetic patients controlled by diet alone had significantly lower HbA1 levels compared to the insulin or oral hypoglycemic treated groups. Only 13% of insulin-treated patients had HbA1 levels below 10%, while 26% of the oral agent treated group and 70% of the diet treated group fell into this range. The HbA1 levels correlated with fasting and nonfasting plasma glucose concentrations. However, in certain patients, discrepant results between these two variables were found. Hemoglobin A1 was measured on three or more occasions in 60 patients over a 1-yr period. An improvement was noted in 40%, no change in 38%, and a deterioration in 22%. Hemoglobin A1 measurements have proved to be useful in the follow-up and treatment of diabetic patients.
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PMID:Metabolic control in diabetic patients: assessment by hemoglobin A1 values. 40 May 65

Hemoglobin A1c is increased in patients with diabetes mellitus and its level reflects the status of blood glucose equilibrium over a period of several weeks. The practical use of its estimation was hampered by technical difficulties in investigating large series of samples. In order to apply this examination for routine purposes we describe in this paper acceleration and full automatization of the original chromatographic method allowing quantitation of hemoglobin A1c in 45 min.
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PMID:Quantitation of hemoglobin A1c: a rapid, automated precision-chromatography technique. 42 45

Hemoglobin A1c (HbA1c) is a minor component of human hemoglobin resulting from a non enzymatic linkage of glucose with the NH2-terminal amino acid of the beta chain of hemoglobin. Under normal conditions, HbA1c represent about 5% of total hemoglobin. The HbA1c blood concentration increases in direct proportion of the duration and degree of hyperglycemia. Available procedures for measuring HbA1c include column chromatography, high pressure liquid chromatography, a colorimetric procedure based on the formation of 5-hydroxymethylfurfural and isoelectrofocusing. In a group of 138 patients, we have confirmed that HbA1c provides a useful means of evaluating the degree of diabetic control: the highest values have been recorded in cases of poor control, the lowest in cases of excellent control. In the latter case, the HbA1c values recorded were not statistically different from those obtained in a control group of 92 non-diabetic subjects. The interest of evaluating this parameter in diabetes is briefly analyzed.
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PMID:[Hemoglobin A1c and diabetes control (author's transl)]. 44 35

Hemoglobin A1c (HbA1c) is a glycosylated derivative of hemoglobin and is one of a family of derivatives whose concentrations are elevated in patients with diabetes mellitus. Published methods for the measurement of HbA1c are relatively tedious and require modest amounts of blood. A high-performance liquid chromatographic (HPLC) method for the determination of HbA1c is presented. The method is rapid (20 minutes), precise (coefficient of variation of 5-10 per cent), uses small amounts of sample (3 microliter.), can be automated. A sample preparation technique using filtration was developed that shortened and simplified preparation of venous blood and allowed use of capillary samples. HbA1c was measured by this method in three age-stratified groups of controls and a group of insulin-requiring juvenile diabetics. There was clear separation of HbA1c values between all normals (5.9 +/- 1.3, 5.6 +/- 0.7, 7.1 +/- 0.9 per cent) and the diabetics (12.1 +/- 2.4 per cent). Use of this method can facilitate large-scale clinical investigations and permit biochemical investigations of the metabolism and formation of hemoglobin A1c where small sample sizes are necessary.
Diabetes 1978 Feb
PMID:A high-performance liquid chromatography method for hemoglobin A1c. 62 38

Hemoglobin (Hb) Alc is a minor component of Hb found in normal individuals but elevated two or threefold in patients with diabetes mellitus. Limited studies have suggested that the level of Hb Alc is proportional to the integrated concentration of glucose over time. Thus it could serve as an index of hyperglycemia. Its measurement may enable a more objective approach to assessing whether or not the control of hyperglycemia can be correlated with the severity of complications of diabetes. Large scale clinicab studies of Hb Alc have not been undertaken for lack of a rapid assay system. This article describes a method of high pressure liquid chromatography (HPLC) which enables the isolation of Hb Alc in 27 min using only 12 microgram of Hb (100 microliter of blood) and a second method for the isolation of total fast Hb components (also elevated in diabetes) in 11 min. Using the first method, a total of 36 assays were performed on the blood of a single normal volunteer over a one month period. the mean level of Hb Alc was 4.95 +/- 0.12% (SD) +/- 0.02% (SEM), while the coefficient of variation (C.V.) was 2.4%. The mean Hb Alc & b level was 1.65 +/- 0.06% +/- 0.01% (C.V. = 3.6%). Values for Hb Alc in 10 normal individuals were 5.06 (mean) +/- 0.32% (SD) +/- 0.01% (SEM). Hb Alc values in 15 patients with diabetes mellitus ranged from 6.8 to 20.0%. The second method was designed to assay Hb Ala, Hb Alb, and Hb Alc as a single peak and yielded results identical to the sum of these components as determined by the first method ( r = 0.98; p less than 0.001).
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PMID:A rapid method for the determination of glycosylated hemoglobins using high pressure liquid chromatography. 62 53

Human hemolysate contains several minor components designated Hb A1a, Hb A1b, Hb A1c, which are post-translational modifications of the major hemoglobin component A0. Individuals with diabetes mellitus have elevated levels of Hb A1c, a hemoglobin modified with a glucose moiety at the NH2 terminus of each beta chain. A new chromatographic technique using Bio-Rex 70 is described which not only allows complete separation of Hb A1a from Hb A1b but also resolution of Hb A1a into two components, designated Hb A1a1 and Hb A1a2. Carbohydrate determinations with the thiobarbituric acid procedure revealed that Hb A1a1, Hb A1a2, and Hb A1b as well as Hb A1c were glycosylated. Total phosphate analysis revealed 2.06 and 1.01 mol of phosphorus/alphabeta dimer for Hb A1a1 and Hb A1a2 respectively; Hb A1b and Hb A1c contained no detectable phosphate. Hemoglobin incubated with D-[14C]glucose-6-P co-chromatographs precisely with Hb A1a2, strongly suggesting that Hb A1a2 is glucose-6-P hemoglobin. Levels of Hb A1a1 and Hb A1a2 are normal in individuals with diabetes mellitus. Furthermore, diabetic red cells contain normal levels of glucose-6-P. Therefore, glucose-6-P hemoglobin does not serve as a significant precursor to Hb A1c. Instead Hb A1c is formed by the direct reaction of hemoglobin with glucose. This suggests that hemoglobin can serve as a model system for nonenzymatic glycosylation of protein.
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PMID:Glycosylated minor components of human adult hemoglobin. Purification, identification, and partial structural analysis. 63 72


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