Pediatric diabetic ketoacidosis and hyperglycemic hyperosmolar state

Overlap of diabetic ketoacidosis and hyperosmolar hyperglycemic state

Diabetic ketoacidosis (DKA) and hyperosmolar hyperglycemia state (HHS) are two life-threatening metabolic complications of diabetes that significantly increase mortality and morbidity. Despite major advances, reaching a uniform consensus regarding the diagnostic criteria and treatment of both conditions has been challenging. A significant overlap between these two extremes of the hyperglycemic crisis spectrum poses an additional hurdle. It has well been noted that a complete biochemical and clinical patient evaluation with timely diagnosis and treatment is vital for symptom resolution. Worldwide, there is a lack of large-scale studies that help define how hyperglycemic crises should be managed. This article will provide a comprehensive review of the pathophysiology, diagnosis, and management of DKA-HHS overlap.

Fluid management in hospitalized pediatric patients

The proper use of intravenous fluids has likely been responsible for saving more lives than any other group of substances. Proper use includes prescribing an appropriate electrolyte and carbohydrate solution, at a calculated rate or volume, for the right child, at the right time. Forming intravenous fluid plans for hospitalized children requires an understanding of water and electrolyte physiology in healthy children and how different pathology deviates from the norm. This review highlights fluid management in several disease types, including liver disease, diabetic ketoacidosis, syndrome of inappropriate antidiuretic hormone, diabetes insipidus, kidney disease, and intestinal failure as well as in those with nonphysiologic fluid losses. For each disease, the review discusses specific considerations, evaluations, and management strategies to consider when customizing intravenous fluid plans. Ultimately, all hospitalized children should receive an individualized fluid plan with recurrent evaluations and fluid modifications to provide optimal care.

The lethargic diabetic: cerebral edema in pediatric patients in diabetic ketoacidosis

Diabetic ketoacidosis (DKA) is the leading cause of hospitalizations for pediatric patients with diabetes mellitus. The most severe complication of DKA is cerebral edema that may lead to brain herniation. We present a case report that highlights the subclinical presentation of DKA-related cerebral edema in a pediatric patient and review the acute care management of suspected cerebral edema during transport.

Impact of fasting on human brain acid-base homeostasis using natural abundance (13) C and (31) P MRS

PURPOSE

To use (13) C magnetic resonance spectroscopy (MRS) and (31) P MRS to develop a direct assay for regional [HCO3-] in the human brain and to define brain pH and physiological response of [HCO3-] to fasting.

MATERIALS AND METHODS

Seven healthy subjects underwent MRS examinations on a 1.5T MRI scanner. Subjects were well fed with repeated examinations performed after 4 and 12 hours of fasting. Proton noise decoupling (13) C MRS were acquired using pulse and acquired acquisition while (31) P MRS were acquired using a 2D chemical shift imaging method with relaxation time (TR) of 2 seconds.

RESULTS

Fasting brain bicarbonate concentrations (6.7 ± 2.5 mM for 12-hour fasting, P = 0.002 and 8.3 ± 2.1 mM for 4-hour fasting, P = 0.015) are significantly reduced compared to fed state (11.6 ± 1.3 mM). However, no significant difference in brain pH was observed, confirming the critical role of pCO2 in intracerebral pH homeostasis.

CONCLUSION

We demonstrated that the intracellular HCO3- in human brain is readily modified by diet but appears to have no measurable effect on cerebral pH. Natural abundance (13) C can provide useful information relevant to human brain pH homeostasis by providing information for HCO3-.

Clinical profile of diabetic ketoacidosis in Indian children

OBJECTIVE

To study the clinical profile of the Indian children admitted with DKA.

METHODS

This descriptive retrospective study was conducted in pediatric ICU of tertiary level care hospital at Delhi (between Jan 2008 and Jan 2010). The case records of 55 children admitted with DKA were reviewed and information with respect to the personal details, clinical features, laboratory parameters, management and outcome was recorded using a predesigned performa.The data was analyzed using SPSS version 16.

RESULTS

The mean age of patients at presentation was 7.4±3.9 y; 27 boys and 28 girls were enrolled. Diabetes was newly diagnosed in 56.4% patients and 43.6% were known cases of diabetes. Polyuria and polydipsia (54.5%), persistent vomiting (52.7%), altered sensorium (50.9%), abdominal pains (47.3%) were common presenting symptoms. Most of the children had dehydration at admission, one fourth being severe. Hypernatremia, hypokalemia, cerebral edema and renal failure were observed in 20%, 14.5%, 14.5% and 7.2% , respectively. While 12.72% had fatal outcome, cerebral edema with or without renal failure and sepsis accounted for most of the deaths.

CONCLUSIONS

Boys and girls were equally affected. Newly diagnosed diabetics constituted more >50% of total DKA admissions. Nearly two third presented with severe DKA. Renal failure, cerebral edema and sepsis contributed to adverse outcome.

Hyperglycemic hyperosmolar syndrome in the pediatric patient: a case report and review of the literature

Hyperglycemic hyperosmolar syndrome (HHS) is a potentially deadly complication of diabetes mellitus that can often be the presenting symptom of the condition in the pediatric population. There is a danger that HHS may not be included in the differential of critical patients because it is still a somewhat rare entity in the pediatric population. However, recent data regarding population trends indicate that HHS will continue to appear more and more commonly in the pediatric population with diabetes. The following case describes an adolescent with many of the typical features of the pediatric patient with HHS as the presenting symptom of diabetes mellitus. The literature regarding HHS in children is still sparse, and much must be extrapolated from adult studies given its relatively recent increased incidence. Included is a brief review of the most recent data regarding epidemiology, treatment, and complications that would be pertinent to the pediatric emergency physician.

Nutritional status and complications in children with diabetic ketoacidosis

OBJECTIVE

Diabetic ketoacidosis in children continues to be an important cause of morbidity and mortality, especially in developing economies as a result of malnutrition, a high rate of infections, and delay in seeking timely medical care. Malnutrition also increases the risk of diabetic ketoacidosis-related complications. The objective of this study was to assess the nutritional status of patients presenting with diabetic ketoacidosis and correlate it with the incidence of complications at presentation and those encountered during the course of illness.

DESIGN

Prospective study.

SETTING

Pediatric emergency and intensive care units, Advanced Pediatrics Centre, PGIMER, Chandigarh, India.

PATIENTS

Thirty-three children between 1 month and 12 yrs of age presenting with diabetic ketoacidosis between July 2008 and June 2009 were enrolled consecutively and assessed for nutritional status by anthropometric parameters (body weight, crown-heel length/height, mid-upper arm circumference, triceps and subscapular skin fold thicknesses), biochemical parameters (serum albumin, zinc, magnesium, vitamin A levels), and preillness dietary history (by pretested Food Frequency Questionnaire). Patients were classified as malnourished or normally nourished based on the weight for age criteria matched for Indian standards. The incidence of complications (electrolyte imbalances, hypoglycemia, sepsis, cerebral edema, etc.) and outcome in terms of survival or death in both the groups were compared with Student's t-test for parametric data, Mann-Whitney U test for nonparametric data, and chi-square test for categorical variables.

INTERVENTIONS

None.

MEASUREMENTS AND MAIN RESULTS

Anthropometric assessment showed that 11 of 33 (33.3%) were malnourished. Preillness dietary history revealed that 16 (48.5%) were calorie- and protein-deficient (known diabetic n = 7; new onset n = 9), whereas 11 (33.3%) were only calorie-deficient (known diabetic n = 2). Hypoalbuminemia was seen in 21 (63.6%), hypovitaminosis A in eight (24.2%), and low zinc levels in three (9%). The malnourished and normally nourished groups were similar with respect to demographics, precipitating factors, severity of diabetic ketoacidosis, treatment received, and outcome. However, the incidence and severity of therapy-related hypokalemia (100% vs. 72.7%; p = .05) and hypoglycemia (63.6 vs. 13.6%; p = .004) were significantly higher in the former as compared with the latter. The mean ± SD admission serum potassium levels were similar in both the groups (3.4 ± 0.8 mEq/L in the malnourished vs. 3.5 ± 0.7 mEq/L in the normally nourished) with the malnourished group showing a significant fall at 6 hrs after start the of diabetic ketoacidosis protocol (2.8 ± 0.8 mEq/L vs. 3.6 ± 0.7 mEq/L; p = .033), although the mean rate and dose of insulin infusion were similar. The fall in blood glucose (mean ± SD mg/dL) at 12, 24, and 36 hrs after onset of the diabetic ketoacidosis protocol was also significantly greater in the malnourished group as compared with the normally nourished diabetic ketoacidosis (195 ± 69.1 and 272.61 ± 96.3, p = .02; 171 ± 58.5 and 257 ± 96.3, p = .05; and 153.75 ± 49.6 and 241.71 ± 76.3, p = .04, respectively). The incidence of hypophosphatemia, hypomagnesemia, cerebral edema, renal failure, sepsis, and septic shock was similar in both the groups. There were two deaths, both resulting from complicating cerebral edema and renal failure and unrelated to the nutritional status of the patients.

CONCLUSIONS

The incidence and severity of therapy-related hypokalemia and hypoglycemia were significantly higher in the malnourished as compared to the normally nourished diabetic ketoacidosis. Other diabetic ketoacidosis-related complications and outcome were similar in both the groups.

Management of diabetic ketoacidosis

Diabetic ketoacidosis (DKA), a life-threatening complication of diabetes mellitus (DM), occurs more commonly in children with type 1 DM than type 2 DM. Hyperglycemia, metabolic acidosis, ketonemia, dehydration and various electrolyte abnormalities result from a relative or absolute deficiency of insulin with or without an excess of counter-regulatory hormones. Management requires careful replacement of fluid and electrolyte deficits, intravenous administration of insulin, and close monitoring of clinical and biochemical parameters directed towards timely detection of complications, including hypokalemia, hypoglycemia and cerebral edema. Cerebral edema may be life threatening and is managed with fluid restriction, administration of mannitol and ventilatory support as required. Factors precipitating the episode of DKA should be identified and rectified. Following resolution of ketoacidosis, intravenous insulin is transitioned to subcutaneous route, titrating dose to achieve normoglycemia.

Cerebral edema in diabetic ketoacidosis

OBJECTIVE

To review the causes of cerebral edema in diabetic ketoacidosis (CEDKA), including pathophysiology, risk factors, and proposed mechanisms, to review the diagnosis, treatment, and prognosis of CEDKA and the treatment of diabetic ketoacidosis as it pertains to prevention of cerebral edema.

DATA SOURCE

A MEDLINE search using OVID was done through 2006 using the search terms cerebral edema and diabetic ketoacidosis. RESULTS OF SEARCH: There were 191 citations identified, of which 150 were used. An additional 42 references listed in publications thus identified were also reviewed, and two book chapters were used.

STUDY SELECTION

The citations were reviewed by the author. All citations identified were used except 25 in foreign languages and 16 that were duplicates or had inappropriate titles and/or subject matter. Of the 194 references, there were 21 preclinical and 40 clinical studies, 35 reviews, 15 editorials, 43 case reports, 29 letters, three abstracts, six commentaries, and two book chapters.

DATA SYNTHESIS

The data are summarized in discussion.

CONCLUSIONS

The causes and mechanisms of CEDKA are unknown. CEDKA may be due as much to individual biological variance as to severity of underlying metabolic derangement of the child's state and/or treatment risk factors. Treatment recommendations for CEDKA and diabetic ketoacidosis are made taking into consideration possible mechanisms and risk factors but are intended as general guidelines only in view of the absence of conclusive evidence.

Management of diabetic ketoacidosis in PICU

OBJECTIVE

This study was undertaken to analyze the outcome of children with DKA treated with a modified protocol at a tertiary level teaching hospital PICU in Pune, Maharashatra.

METHODS

We retrospectively analyzed case records of 12 patients (8 males and 4 females) with DKA (11 new and 1 readmission) admitted in our PICU from January 2005 to June 2006. Patients were managed according to a modified protocol (that is with less intensive biochemical monitoring when compared with standard book protocols). Laboratory parameters measured were blood glucose, urinary ketones, electrolytes, urea creatinine, arterial blood gas (ABG) and infectious screen. Treatment included fluid therapy and insulin infusion- 0.1 u/Kg short acting intravenously followed by 0.1 u/Kg/hr. No bicarbonate was administered as a bolus.

RESULTS

Total fluid deficit was corrected slowly over a period of 36 hr. The median time to normalize ABG was 19 hr (5.3-39) while the median time for the urinary ketones to disappear was 1day (1-3). The child to nurse ratio was 1:2, there were 2 pediatric residents in house all 24 hr with an intensivist and pediatric endocrinologist on call.

CONCLUSION

We have shown that when DKA is managed in a PICU setting using modified protocol, the outcome is good and complications such as brain edema can be prevented.