Assessment of nutritional status: functional indicators of pediatric nutriture

Alimentación y estado nutricional de los niños en zonas palúdicas de Antioquia (Colombia)

Introducción: Malaria, parasitosis intestinales y desnutrición interactúan en los habitantes de zonas palúdicas, en particular en niños. Objetivo: Medir el estado nutricional de niños (4-10 años) con malaria y algunos aspectos del consumo alimentario familiar en dos zonas maláricas del departamento de Antioquia. Metodología: Estudio transversal en niños que consultaron por paludismo. Diseño muestral aleatorio. Resultados: A) Consumo alimentario familiar: 74% obtenían regularmente alimentos de criar animales menores, huerta casera o ambos; 17% recibían regularmente alimentos, dinero o ambos; consumo de alimentos fuentes de vitamina A (veces/semana): carnes-vísceras animales 1, leche y huevos 2-3 cada uno, frutas con provitamina A. Satisfacción alimentaria de requerimientos nutricionales familiares de fuentes de vitamina A: 55% (grado bajo-medio). B) Estado nutricional infantil: Riesgo de desnutrición: 52% crónica, 15% aguda; parásitos intestinales patógenos 80%; promedio de hemoglobina pretratamiento 10.3 gr/dL (6.39 mmol/L) y al día 30 en 11.8 gr/dL (7.32 mmol/L); promedio de retinol pretratamiento de 19.1 µg/dL (0.67 µmol/L) y al día 30 31.2 µg/dL (1.09 µmol/L). Conclusiones: La desnutrición crónica amenaza a ≥50% de los niños; esa frecuencia es 3-4 veces la encontrada en Colombia.  No hubo asociación estadísticamente significativa entre estado nutricional y las variables asociadas a obtención-consumo alimentario. Quizás esta ausencia de relación se deba a que las variables usadas para medir estas condiciones no sean adecuadas o se hayan medido de manera inapropiada. 

Early identification and treatment necessary to prevent malnutrition in children and adolescents with severe disabilities

Children with severe developmental disabilities frequently have nutrition and growth problems that range from moderate to severe. Because of notable continuing medical concerns and lowered growth expectations, parents and physicians may fail to recognize gradual deterioration in nutritional status before severe medical complications occur. The two cases reported in this article illustrate the need for early identification and treatment to prevent the development of notable morbidity secondary to malnutrition. Children and adolescents who have growth parameters consistently below age norms require assessment and monitoring by a registered dietitian to detect feeding problems and intake changes and to provide early intervention to help prevent negative consequences (eg, dehydration, protein-energy malnutrition, decubitus ulcers, increased rate and duration of infections, and altered bowel motility). An initial assessment should consist of measurement of length or height, weight, triceps, and subcapsular skinfolds; dietary and feeding history and a review of medical history; and biochemical testing as indicated by the medical and dietary histories. Monitoring frequency, which is determined by age, severity of condition, and response to treatment, may vary from weekly to bimonthly.

Pathways to the impairment of human nutritional status by gastrointestinal pathogens

Gastrointestinal pathogens are of three varieties, those that can, and often do, take the life of the host, those that infect transiently and rarely are life-threatening, and those (parasites) that establish a relatively prolonged residence or colonization of the host's alimentary tract. In the case of the second form, if infections are recurrent, both catabolic effects during the episode and failure to digest foods and/or absorb nutrients results. Similarly, catabolic wastage through activation of the acute phase response, and interference with the host's acquisition of nutrients by maldigestion, malabsorption, intestinal losses and competition with the parasite burden can impair growth and nutrition with helminthic infections. Growth and nutrition with respect to all of the macronutrients and virtually all of the micronutrients have been documented to be adversely affected by gastrointestinal pathogens. For its burgeoning importance as a worldwide health problem, both with the HIV virus as a direct intestinal pathogen and with the opportunistic gut infections occurring in the immunocompromised host, AIDS represents the emerging context of the impairment of nutritional status by intestinal pathogens.

Pediatric nutritional assessment

Nutritional assessment is an important facet of the medical care of infants and children. An accurate assessment allows for the early detection and treatment of nutrient deficiencies. The traditional nutritional assessment includes anthropometric measurements, biochemical evaluation, clinical examination, and dietary evaluation. Newer techniques include the assessment of body composition using total body electrical conductivity or bioelectrical impedance. The sophistication of nutritional support makes it necessary to identify more sensitive methods for accurate nutritional assessment.

Laboratory tests and nutritional assessment. Protein-energy status

1. There is no one definitive laboratory test, group of tests, or indices that are satisfactory for the assessment of protein-calorie status. 2. Clinical evaluation remains the simplest, most widely available, most reproducible, and wisest method. It is satisfactory for the majority of clinical situations. 3. The laboratory should be used selectively and to complement clinical evaluation. Routine testing must be relegated to research protocols. 4. Always include some assessment of inflammation (for example, C-reactive protein, erythrosedimentation rate [ESR]), because its presence affects the interpretation of all the other tests. 5. The pathophysiologic effects of the underlying disease, especially in hospitalized patients, will affect the interpretation of every one of the laboratory tests. 6. Nutritional status often impacts more on the interpretation of commonly performed laboratory tests than laboratory tests impact on the assessment of nutrition.

Failure to thrive

Malnutrition is the primary biologic insult in most cases of failure to thrive. A transactional model of infant development provides a framework for understanding the psychosocial context in which such malnutrition occurs. Each child who fails to thrive should receive a multidisciplinary evaluation to address the diagnostic and therapeutic implications of nutritional, medical, psychosocial, and developmental factors contributing to growth failure.