The science and art of pediatric critical care nutrition

PURPOSE OF REVIEW

Nutritional status and nutrient delivery during critical illness impact clinical outcomes. We have reviewed recent studies that may guide best practices regarding nutrition therapy in critically ill children.

RECENT FINDINGS

Malnutrition is prevalent in the pediatric ICU population, and is associated with worse outcomes. Nutrition support teams, dedicated dietitians, and educational programs facilitate surveillance for existing malnutrition and nutrition risk, but specific tools for the pediatric ICU population are lacking. Estimation of macronutrient requirements is often inaccurate; novel strategies to accurately determine energy expenditure are being explored. Indirect calorimetry remains the reference method for measuring energy expenditure. Enteral nutrition is the preferred route for nutrition in patients with a functioning gut. Early enteral nutrition and delivery of adequate macronutrients, particularly protein, have been associated with improved clinical outcomes. Delivery of enteral nutrition is often interrupted because of fasting around procedures and perceived intolerance. Objective measures for detection and management of intolerance to nutrient intake are required. In low-risk patients who are able to tolerate enteral nutrition, supplemental parenteral nutrition may be delayed during the first week of critical illness.

SUMMARY

Systematic research and consensus-based practices are expected to promote optimal nutritional practices in critically ill children with the potential to improve clinical outcomes.

Energy and Protein Delivery in Overweight and Obese Children in the Pediatric Intensive Care Unit

BACKGROUND

Early and optimal energy and protein delivery have been associated with improved clinical outcomes in the pediatric intensive care unit (PICU). Overweight and obese children in the PICU may be at risk for suboptimal macronutrient delivery; we aimed to describe macronutrient delivery in this cohort.

METHODS

We performed a retrospective study of PICU patients ages 2-21 years, with body mass index (BMI) ≥85th percentile and >48 hours stay. Nutrition variables were extracted regarding nutrition screening and assessment, energy and protein prescription, and delivery.

RESULTS

Data from 83 patient encounters for 52 eligible patients (52% male; median age 9.6 [5-15] years) were included. The study cohort had a longer median PICU length of stay (8 vs 5 days, P < .0001) and increased mortality rate (6/83 vs 182/5572, P = .045) than concurrent PICU patient encounters. Detailed nutrition assessment was documented for 60% (50/83) of patient encounters. Energy expenditure was estimated primarily by predictive equations. Stress factor >1.0 was applied in 44% (22/50). Median energy delivered as a percentage of estimated requirements by the Schofield equation was 34.6% on day 3. Median protein delivered as a percentage of recommended intake was 22.1% on day 3.

CONCLUSIONS

The study cohort had suboptimal nutrition assessments and macronutrient delivery during their PICU course. Mortality and duration of PICU stay were greater when compared with the general PICU population. Nutrition assessment, indirect calorimetry-guided energy prescriptions, and optimizing the delivery of energy and protein must be emphasized in this cohort. The impact of these practices on clinical outcomes must be investigated.

A nutritional support team in the pediatric intensive care unit: Changes and factors impeding appropriate nutrition

BACKGROUND & AIMS

The aims of this study were to determine the impact of a nutritional support team (NST) intervention in a pediatric intensive care unit (PICU) and to identify the factors at admission that were associated to a delay to achieve a sustained optimal caloric intake (SOCI).

METHODS

Caloric and protein intake and nutritional parameters were compared in 82 children in 2000 and 2003, respectively before and after the introduction of a NST. Predictive factors of a delay to achieve the SOCI were identified using multivariate analysis.

RESULTS

There was no difference in 2000 and 2003, respectively, regarding cumulative caloric deficits (19+/-15.7 vs. 20.7+/-14.8 kcal/kg day), cumulative protein deficits (0.26+/-0.31 vs. 0.22+/-0.20 g/kg day), time to achieve a SOCI (7 vs. 7 days). Factors at admission associated with a delay to achieve a SOCI were a pediatric risk of mortality (PRISM) score > 10 (hazard ratio 0.58; 95% CI 0.44-0.77), a CRP > 50 mg/L (hazard ratio 0.49; 95% CI 0.35-0.70), a fluid restriction (hazard ratio 0.51; 95% CI 0.37-0.71), and a weight for age > 3rd centile (hazard ratio 0.54; 95% CI 0.41-0.72).

CONCLUSIONS

The intervention of a NST has not modified significantly the nutritional management. In pediatric intensive care, many factors identified at admission are associated with impairing appropriate nutrition.

A survey of neonatal nutrition policies and practices in the UK and Eire

Optimal nutrition is one of the fundamental components for infants to reach their full growth and neurodevelopmental potential. Best practice is facilitated by a contemporaneous, multidisciplinary, evidence-based nutrition policy. Such evidence has recently been reviewed. We have assessed: the prevalence of nutrition policies in neonatal units in the UK and Eire; their application to hypothetical cases; the availability of dietetic input; and whether any differences existed between non-regional and regional units. A standardized questionnaire was devised by a multidisciplinary group and posted to all 255 neonatal units in the UK and Eire in 2002. Replies from 67 neonatal units were received: 48 out of 233 non-regional and 19 out of 22 regional units. A feeding policy was present in 33 units, and regular access to dietitians occurred in 37 units. For a hypothetical infant less than 28 weeks' gestation, enteral feeds would be commenced at 0-2 days in 81% of non-regional and 94% of regional units (P = ns), and be continuous in 11% of non-regional and 32% of regional units, and bolus feeding in 89% of non-regional and 68% of regional units (P = ns). Routine fortification of breastmilk would occur more frequently in non-regional units (96%) than in regional units (79%) (P = 0.050). Vitamin and iron supplements would be given to infants receiving postdischarge or high-energy milks in 68% of non-regional units and in 79% of regional units (P = ns). Calorie counts (63% regional vs. 8% non-regional, P < 0.001), and daily weights (68% regional vs. 33% non-regional, P = 0.014), were used more frequently in regional units. Many units surveyed did not have a nutrition policy. Many infants receive unnecessary additional vitamins and supplements. Practice is variable throughout the country, but we found no evidence of major differences between regional and non-regional units, apart from their monitoring of growth and rates of breastmilk fortifier usage.

The need for nutrition support teams in pediatric units: a commentary by the ESPGHAN committee on nutrition

The reported prevalence of malnutrition in pediatric hospitals ranges from 15% to 30% of patients, with an impact on growth, morbidity and mortality. Major deficits in nutrition care have been highlighted in European hospitals, and the implementation of nutrition support teams (NSTs) has been suggested as a means to improve malnutrition diagnosis and nutrition care for hospitalized patients. This comment by the ESPGHAN Committee on Nutrition reviews disease related-mechanisms causing malnutrition and consequences of malnutrition and suggests a framework for implementation of NSTs in pediatric units. The recommendations by the Committee on Nutrition include: 1) Implementation of NSTs in hospitals is recommended to improve nutritional management of sick children; 2) The main tasks of the NST should include screening for nutritional risk, identification of patients who require nutritional support, provision of adequate nutritional management, education and training of hospital staff and audit of practice; 3) The NST should be multidisciplinary, with expertise in all aspects of clinical nutrition care; 4) The funds needed to support NSTs should be raised from the health care system; and 5) Further research is needed to evaluate the effects of NSTs in prevention and management of pediatric nutritional disorders, including cost effectiveness in different settings.