Relationship of gastrointestinal symptoms and psychosocial distress to gastric retention in children.

Objectives: To determine whether gastrointestinal (GI) symptoms (abdominal pain, nonpain GI symptoms, nausea) and/or psychosocial distress differ between children with/without gastroparesis and whether the severity of GI symptoms and/or psychosocial distress is related to the degree of gastroparesis.

Study Design: Children aged 7-18 years (N = 100; 63 female patients) undergoing a 4-hour gastric emptying scintigraphy study completed questionnaires evaluating GI symptoms, anxiety, and somatization for this prospective study. Spearman correlation, Mann-Whitney, t-test, and χ(2) tests were used as appropriate for statistical analysis.

Decreased relative diagnostic yield of esophagogastroduodenoscopy in children with gastroparesis.

Background: Esophagogastroduodenoscopy (EGD) and gastric emptying scintigraphy (GES) are commonly performed in the evaluation of children with upper gastrointestinal symptoms. It has been presumed, but not clarified, that gastroparesis increases the likelihood of identifying abnormalities on EGD. We sought to determine whether the presence of gastroparesis influenced the diagnostic yield of EGD in children.

Implantable drug delivery device using frequency-controlled wireless hydrogel microvalves.

This paper reports a micromachined drug delivery device that is wirelessly operated using radiofrequency magnetic fields for implant applications. The controlled release from the drug reservoir of the device is achieved with the microvalves of poly(N-isopropylacrylamide) thermoresponsive hydrogel that are actuated with a wireless resonant heater, which is activated only when the field frequency is tuned to the resonant frequency of the heater circuit. The device is constructed by bonding a 1-mm-thick polyimide component with the reservoir cavity to the heater circuit that uses a planar coil with the size of 5-10 mm fabricated on polyimide film, making all the outer surfaces to be polyimide.