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William L Hasler
Chronic unexplained nausea and vomiting (CUNV) refers to a symptom complex defined by nausea and/or vomiting with normal diagnostic testing, including anatomic assessments (including upper endoscopy) and measures of upper gut function (e.g., gastric emptying testing). Nausea and vomiting in this condition are postulated to result from aberrant peripheral or central neurohumoral activity. A substantial subset of patients satisfies this diagnosis as more than half of individuals referred for scintigraphic testing exhibit normal gastric emptying rates...
December 2016: Current Treatment Options in Gastroenterology
John M Wo, Thomas V Nowak, Shamaila Waseem, Matthew P Ward
Gastroparesis is a heterogeneous clinical syndrome. Some patients have debilitating vomiting, weight loss, and dehydration, while others have effortless regurgitation of undigested foods or postprandial distress suggestive of functional dyspepsia. Gastric electrical stimulation (GES) has been proposed as an effective treatment option for patients with gastroparesis refractory to medical therapy. Evidence suggests that the clinically available device, a low-energy high-frequency GES, activates the vagal afferent pathways to influence the central control mechanisms for nausea and vomiting...
December 2016: Current Treatment Options in Gastroenterology
Dong Die, Ben-Xia Zheng, Lan-Qiong Zhao, Qi-Wen Zhu, Zheng-Quan Zhao
The structural, electronic and magnetic properties of Cun+1 and CunV (nā€‰=ā€‰1-12) clusters have been investigated by using density functional theory. The growth behaviors reveal that V atom in low-energy CunV isomer favors the most highly coordinated position and changes the geometry of the three-dimensional host clusters. The vibrational spectra are predicted and can be used to identify the ground state. The relative stability and chemical activity of the ground states are analyzed through the binding energy per atom, energy second-order difference and energy gap...
August 18, 2016: Scientific Reports
Shinichi Hirabayashi, Masahiko Ichihashi
Reactions of copper cluster cations doped with an early transition metal atom, CunTi(+) (n = 4-15) and CunV(+) (n = 5-14, 16), with NO and O2 were investigated at a near-thermal collision energy using a guided ion beam tandem mass spectrometer. Most of the clusters adsorb NO and O2 under single collision conditions, and this reaction is often followed by the release of Cu atoms. For both Ti- and V-doped Cu clusters, the total cross sections for the reaction with NO increase gradually with the cluster size up to n ā‰ˆ 11 and then decrease rapidly, whereas those with O2 are almost constant in n ā‰¤ 12 and then decrease...
March 17, 2016: Journal of Physical Chemistry. A
Timothy R Angeli, Leo K Cheng, Peng Du, Tim Hsu-Han Wang, Cheryl E Bernard, Maria-Giuliana Vannucchi, Maria Simonetta Faussone-Pellegrini, Christopher Lahr, Ryash Vather, John A Windsor, Gianrico Farrugia, Thomas L Abell, Gregory O'Grady
BACKGROUND & AIMS: Chronic unexplained nausea and vomiting (CUNV) is a debilitating disease of unknown cause. Symptoms of CUNV substantially overlap with those of gastroparesis, therefore the diseases may share pathophysiologic features. We investigated this hypothesis by quantifying densities of interstitial cells of Cajal (ICCs) and mapping slow-wave abnormalities in patients with CUNV vs controls. METHODS: Clinical data and gastric biopsy specimens were collected from 9 consecutive patients with at least 6 months of continuous symptoms of CUNV but normal gastric emptying who were treated at the University of Mississippi Medical Center, and from 9 controls (individuals free of gastrointestinal disease or diabetes)...
July 2015: Gastroenterology
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