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PubMed1981

The mechanism of hyperchloremic acidosis during the recovery phase of diabetic ketoacidosis.

To determine the mechanism of hyperchloremic acidosis during recovery from diabetic ketoacidosis (DKA), serial measurements were made in eight patients of serum and urinary electrolytes and organic acids, and of urinary net acid. On admission, the average decrease in serum total CO2 was 17.5 mmol/L, corresponding to the excess anion gap, 18.5 meq/L, and the serum organic acids, 17.1 meq/L. With the treatment, the anion gap and organic acids decreased by 16.1 and 14.7 meq/L, respectively, but the serum CO2 increased only by 8.4 mmol/L; serum electrolyte balance was maintained by increase in chloride concentration. Fluid retention was insufficient to explain the disparity between the increase in CO2 and the decrease in organic acids. Renal loss of bicarbonate precursors during treatment was modest and was exceeded by renal bicarbonate production. The disparity between the increase in serum CO2 and the decrease in organic acids during treatment of DKA may be explained to a large extent by a difference in volume of distribution between bicarbonate and organic anions. The renal loss of ketone anions before admission, however, is ultimately responsible for the persistence of substantial metabolic acidosis.

Acidosis↗
PubMed2005

Diabetic ketoacidosis.

Diabetic ketoacidosis (DKA) is an acute metabolic complication of diabetes characterized by hyperglycemia, ketosis and acidosis. The pathophysiology of DKA is reviewed and diagnostic and therapeutic modalities are discussed in the context of the currently available evidence. Complications associated with DKA are often a result of the treatment itself, and these issues are also discussed.

Acidosis↗
PubMed2005

Bone calcium changes during diabetic ketoacidosis: a comparison with lactic acidosis due to volume depletion.

In this study, we aimed to compare bone calcium system changes from children with diabetic ketoacidosis or acute metabolic acidosis due to dehydration to find out the relative contribution of metabolic acidosis and diabetes-related factors on expected negative calcium balance. We studied a set of non-invasive parameters of bone remodeling in 16 children with diabetic ketoacidosis due to new onset type 1 diabetes and 25 children with acute metabolic acidosis due to dehydration complicating acute gastroenteritis before and after the correction of acidosis. The two groups of subjects were matched for age, sex, pubertal status, and degree of metabolic acidosis and dehydration. A group of 18 age and sex-matched healthy children served as the control group. Plasma ionized calcium levels were increased in both groups, significantly more so in diabetic ketoacidosis. While osteoblastic markers, osteocalcin and alkaline phosphatase, were depressed to a comparable degree in both groups, urinary calcium/creatinine ratio and hydroxyproline excretion were significantly greater in diabetic ketoacidosis. No significant changes in calcitrophic hormone (intact PTH, calcitonin, 25-hydroxy vitamin D3) levels were observed. All study parameters except for serum phosphate levels behaved in parallel in both clinical conditions, and abnormalities disappeared with the correction of acidosis except for IGF-1, which remained low in diabetic subjects. In conclusion, our results suggest that, in diabetic ketoacidosis, the observed severe negative calcium balance occurred through diminished bone formation mediated by metabolic acidosis per se and increased bone mineral dissolution and bone resorption because of severe insulin deficiency and secondarily via metabolic acidosis. Observed changes appear to be independent of calcitrophic hormones.

Acidosis, Lactic↗
PubMed1978

[Lactic acidosis--a possible complication in buformin-treated diabetics (author's transl)].

Lactic acidosis is defined as a state of metabolic acidosis (arterial pH below 7.36) due to an increase in the blood concentration of lactate above 2 mEq/l. Lactic acidosis may occur under a variety of conditions; the biguanide-induced lactic acidosis is due to the toxic effects of biguanides (buformin, metformin, phenformin). The clinical picture is characterized by the occurrence of disturbances of consciousness, severe acidosis with Kussmaul's respiration, shock, hypothermia and in about 30% of all cases hypoglycemia. Apart from the general principles of intensive medical care, therapy should comprise correction of the acid-base-disturbances and elimination of the offending biguanide. The efficacy of hemodialysis in the treatment of biguanide-induced lactic acidosis is difficult to evaluate. By a more sensible use of biguanides, lactic acidosis secondary to drug administration should become a rare event.

Acidosis↗