[Pitfalls in hemoglobin oxygen saturation measurement: a case of chronic desaturation]. / Pièges de la mesure de la saturation de l'hémoglobine en oxygène : à propos d'un cas de désaturation chronique.

The measurement of oxygen saturation by pulse oximetry (SpO2) is simple and fast. This non-invasive and widespread technique gives an indication of the oxygen level in arterial blood. While the method is reliable, there are limitations that can compromise the diagnostic procedure. The objective of the present paper is to list these limitations and discuss the precautions to be taken to optimize the interpretation of the results. Based on the case of a 3-year-old patient who presented with chronic hemoglobin oxygen desaturation, we discuss a decision-making algorithm in order to avoid unnecessary, expensive, and stressful investigations.

Micronutrient status of children receiving prolonged enteral nutrition.

BACKGROUND AND AIMS: The aim of this study was to assess the micronutrient status of children receiving prolonged enteral nutrition. METHODS: This cross-sectional single-center study included all 64 children (median age 6.8 years) receiving enteral nutrition providing >50% of daily energy intake for more than 6 months (median duration of enteral nutrition 43 months). The characteristics of the patients and mode of enteral nutrition were recorded. The concentrations of iron, zinc, copper, selenium and vitamins A, D, E and C were measured in plasma. RESULTS: Twelve children (19%) had iron deficiency. A high 25-hydroxyvitamin D concentration was recorded in 20% of the children, but none had associated hypercalcemia. Fifty-two children (81%) had low zinc concentrations in both plasma and erythrocytes. Plasma zinc, calcium, phosphorus and vitamin D concentrations were significantly lower in children receiving fiber supplementation. Abnormal micronutrient concentrations were found more frequently in the children receiving fiber supplementation. No other predisposing factors were associated with micronutrient deficiencies. CONCLUSION: Long-term enteral nutrition can lead to micronutrient deficiencies in children, whose micronutrient concentrations may require regular checking. Fiber supplementation might reduce the bioavailability of zinc, calcium, phosphorus and vitamin D.

Efficacy and tolerance of gastrostomy feeding in Duchenne muscular dystrophy.

Undernutrition occurs often in individuals with Duchenne muscular dystrophy (DMD). Between 1997 and 2007, a gastrostomy was placed in 25 patients with DMD (median: 23 years old; range, 11-38 years) for weight loss (n=22) and/or swallowing disorders (n=13). We evaluated nutritional status using the weight-for-age (W/A) ratio, comparing the values to the reference curve for DMD patients. During the first 9 months, nutritional status improved: the W/A ratio increased and reached a plateau. The W/A ratio was 69% (range, 45-128%) at the start and increased to 87% (range, 49-164%) at the maximal follow-up of 22 months (P<0.001). However, the W/A ratio did not reach the median value for age. Complications occurred in 21 patients (84%), but caused no mortality. Our data suggest that gastrostomy is well tolerated by, and effective for improving the nutritional status of, individuals with DMD.