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Biomedical subjects

J Ditzel

Publications and source records attributed to J Ditzel.

At least 73 records · Page 4Linked to original sources
PubMed1978

Haemoglobin AIc concentrations after initial insulin treatment for newly discovered diabetes.

Glycosylated haemoglobins AIa+Ib and AIc were measured serially in 10 consecutive cases of newly discovered non-acidotic diabetes before and after diet and insulin treatment. The average concentration of Hb AIc was 11.4% in untreated diabetics as compared with 4.3% in healthy controls. With prolonged optimal regulation of blood glucose Hb AIc slowly decreased to a mean concentration of 5.5%. The concentration of Hb AIc was significantly correlated with the fasting blood sugar value. The findings suggest that determining Hb AIc may give valuable information on the regulation of carbohydrate metabolism in the preceding one to two months and thus become an important aid to management.

Adolescent↗
PubMed1978

An adverse effect of insulin on the oxygen-release capacity of red blood cells in nonacidotic diabetics.

Oxyhemoglobin dissociation curves (ODC) were performed on blood from newly diagnosed, nonketotic diabetics prior to and following initial insulin treatment and from ambulatory juvenile diabetics before and after their usual morning insulin. In 10 newly discovered diabetics the average P50 at in vivo pH was normal prior to insulin (26.2 mm Hg), decreased to 24.5 mm Hg (p less than 0.005) on the day following the initial insulin administration, and was within normal limits (26.9 mm Hg) when the diabetes was finally well controlled and red cell 2,3-diphosphoglycerate (2,3-DPG) had risen to elevated levels. Oxygen affinity of hemoglobin was closely correlated with the content of red cell 2,3-DPG (r = 0.61, p less than 0.001) but was unrelated to the level of hemoglobin Alc. In 40 juvenile patients the average P50 was also normal prior to insulin administration but was significantly lower 3-4 hr after they had received their usual insulin dose (p less than 0.001). The study indicates that insulin administration to diabetics with high blood glucose levels may lead to transient decreases in red cell 2,3-DPG and in oxygen-releasing capacity of the red blood cells.

Adolescent↗
PubMed1977

Effect of the diphosphonate EHDP on plasma inorganic phosphate and hemoglobin oxygen affinity of diabetic and healthy subjects.

The effect of oral disodium ethane-1-hydroxy-1,1-diphosphonate, EHDP (20 mg kg-1 day-1) and placebo given for 28 days on plasma inorganic phosphate (Pi) red cell 2,3-diphosphoglycerate and oxygen affinity of hemoglobin was evaluated in 14 insulin-treated diabetics and 5 healthy volunteers. EHDP significantly increased mean Pi (diabetics: 1.18 to 1.67 mmol/l, p less than 0.01, controls: 1.03 to 1.71 mmol/l, p less than 0.02) and P50 at in vivo pH of the oxyhemoglobin dissociation curve (diabetics: 25.4 to 26.6 mmHg, p less than 0.02; controls: 26.3 to 28.9 mmHg, p less than 0.02). Pi and P50 were correlated in both diabetics and in controls (p less than 0.05). 2,3-DPG increased when the diabetics were on EHDP (p less than 0.005). The study emphasizes the importance of Pi on red cell function and indicates that an elevation of Pi tends to counteract the defect in oxygen release capacity of the red cells in diabetic subjects.

Carbon Dioxide↗
PubMed1977

Hyperlipoproteinemia, diabetes, and oxygen affinity of hemoglobin.

Oxyhemoglobin dissociation curves (ODC) were performed on blood from diabetic and nondiabetic subjects with and without hypertriglyceridemia. P50 at in vivo pH was slightly lower than normal in normolipemic diabetics (25.7 versus 26.6 mmHg, p less than 0.05), in spite of increased red cell 2,3-diphosphoglycerate concentration (15.4 versus 14.4 mumole/g Hg, p less than 0.025). P50 at in vivo pH in diabetics with moderately elevated very low density lipoproteins (VLDL)--Type IV hyperlipoproteinemia (HLP)--was likewise found to be slightly lower than normal (25.5 versus 26.6 mmHg, p less than 0.05). In contrast, diabetics with pronounced hyperlipemia due to accumulation of chylomicrons (type I HLP) or due to accumulation of chylomicrons (type I HLP) or due to accumulation of chylomicrons as well as VLDL (type V HLP) showed markedly increased hemoglobin--oxygen affinity (P50:21.1 versus 26.6 mmHg, p less than 0.001). The change in the ODC of normolipemic diabetics is considered to be an expresssion of the presence of an increased proportion of a hemoglobin fraction (Hb Alc) with increased oxygen affinity. The additional change in the ODC of the hyperlipemic patients is thought to be secondary to accumulation of triglyceride-rich particles for the following reasons: (1) a similar increase in oxygen affinity of hemoglobin was demonstrated in familial type I HLP of nondiabetic subjects; (2) normal red cells increased their oxygen affinity when incubated in lactescent plasma; (3) in both acquired types I and V HLP the disappearance of HLP was followed by a normalization of the ODC.

Adolescent↗
PubMed1977

Diabetic vascular disease. The importance of insulin deficiency, hyperglycemia and hypophosphatemia on red cell oxygen unloading.

Diabetes is associated with a fluctuating impairment in oxygen transport of the erythrocytes. This impairment is correlated with hyperglycemia by the formation of glycosylated hemoglobin (HbAIC) and with inhibitory factors of glycolysis i.e. hypophosphatemia and acidosis which lower the concentration of red cell 2,3-diphosphoglycerate. Diabetic angiopathy may be the ultimate result of innumerable microvascular responses to discrete hypoxic injuries associated with increased plasma permeation through the vessel walls. It is shown that two additional risk factors for atherosclerosis--smoking and hypertriglyceridemia may also lead to arterial wall hypoxia by changing the position of the oxyhemoglobin dissociation curve.

Child↗
PubMed1977

Bone mineralization and bone mineral content in primary hyperparathyroidism.

The degree of bone mineralization and the bone mineral content (BMC) was evaluated in 6 patients with primary hyperparathyroidism. The degree of bone mineralization was estimated as the phosphorus/hydroxyproline ratio (P/Hypro) in bone biopsies; BMC was estimated by photon absorptiometry on both forearms. The mena values of both parameters were significantly lower than normal (P less than 0.001 for P/Hypro; P less than 0.02 for BMC). As no significant correlation was found between P/Hypro and BMC in hyperparathyroidism, the findings of low values of P/Hypro and of BMC in patients with elevated serum calcium point to primary hyperparathyroidism.

Adult↗
PubMed1977

The oxyhemoglobin dissociation curve in patients with familial hyperchylomicronemia.

In order to study the effect of marked chylomicronemia on red cell oxygen release, oxygen hemoglobin dissociation curves (ODC's) from zero to full saturation were determined on whole blood from three siblings with familial Type I hyperlipoproteinemia. In these cases the oxygen affinity of hemoglobin was markedly increased, with P50 act. pH varying between 22.1 and 17.7 mm. Hg (normal value, 27.3 mm. Hg; S.D., 1.3) and the Hill coefficient n reflecting the slope of the ODC was increased. The changes in the ODC's are thought to be secondary to the hyperchylomicronemia for the following reasons: (1) the change was minimized by incubating red cells from the patients in normal donor plasma; (2) normal red cells increased their oxygen affinity when incubated in lactescent plasma; (3) the change was not explainable by a decrease in red cell 2,3-diphosphoglycerate content or in arterial blood hydrogen ion concentration. Based on these findings a decreased erythrocyte oxygen release of one third can be hypothesized. The importance of this observation in relation to the symptomatology of clinical conditions complicating marked chylomicronemia is discussed.

Adolescent↗