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Swallowing physiology

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https://www.readbyqxmd.com/read/27863989/the-gut-in-the-beaker-missing-the-surfactants
#1
REVIEW
Clive G Wilson, Gavin W Halbert, Jenifer Mains
Gastrointestinal drug administration is the preferred route for the majority of drugs however, the natural physiology and physicochemistry of the gastrointestinal tract is critical to absorption but complex and influenced by factors such as diet or disease. The pharmaceutical sciences drive for product consistency has led to the development of in vitro product performance tests whose utility and interpretation is hindered by the complexity, variability and a lack of understanding. This article explores some of these issues with respect to the drug, formulation and the presence of surfactant excipients and how these interact with the natural bile salt surfactants...
October 15, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/27863685/the-gut-in-the-beaker-missing-the-surfactants
#2
REVIEW
Clive G Wilson, Gavin W Halbert, Jenifer Mains
Gastrointestinal drug administration is the preferred route for the majority of drugs however, the natural physiology and physicochemistry of the gastrointestinal tract is critical to absorption but complex and influenced by factors such as diet or disease. The pharmaceutical sciences drive for product consistency has led to the development of in vitro product performance tests whose utility and interpretation is hindered by the complexity, variability and a lack of understanding. This article explores some of these issues with respect to the drug, formulation and the presence of surfactant excipients and how these interact with the natural bile salt surfactants...
November 30, 2016: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/27823802/in-vivo-observations-and-in-vitro-experiments-on-the-oral-phase-of-swallowing-of-newtonian-and-shear-thinning-liquids
#3
S Mowlavi, J Engmann, A Burbidge, R Lloyd, P Hayoun, B Le Reverend, M Ramaioli
In this study, an in vitro device that mimics the oral phase of swallowing is calibrated using in vivo measurements. The oral flow behavior of different Newtonian and non-Newtonian solutions is then investigated in vitro, revealing that shear-thinning thickeners used in the treatment of dysphagia behave very similar to low-viscosity Newtonian liquids during active swallowing, but provide better control of the bolus before the swallow is initiated. A theoretical model is used to interpret the experimental results and enables the identification of two dynamical regimes for the flow of the bolus: first, an inertial regime of constant acceleration dependent on the applied force and system inertia, possibly followed by a viscous regime in which the viscosity governs the constant velocity of the bolus...
October 17, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27810735/profound-differences-between-humans-and-rodents-in-the-ability-to-concentrate-salivary-nitrate-implications-for-translational-research
#4
Marcelo F Montenegro, Michaela L Sundqvist, Carina Nihlén, Michael Hezel, Mattias Carlström, Eddie Weitzberg, Jon O Lundberg
In humans dietary circulating nitrate accumulates rapidly in saliva through active transport in the salivary glands. By this mechanism resulting salivary nitrate concentrations are 10-20 times higher than in plasma. In the oral cavity nitrate is reduced by commensal bacteria to nitrite, which is subsequently swallowed and further metabolized to nitric oxide (NO) and other bioactive nitrogen oxides in blood and tissues. This entero-salivary circulation of nitrate is central in the various NO-like effects observed after ingestion of inorganic nitrate...
October 25, 2016: Redox Biology
https://www.readbyqxmd.com/read/27795799/-thyroid-abscess-revealing-graves-basedow-disease-about-a-case-and-review-of-the-literature
#5
Meriem Chenguir, Hajar Souldi, Fatima Zahra Loufad, Sami Rouadi, Reda Abada, Mohamed Roubal, Mohamed Mahtar
Thyroid abscess is a very rare clinical entity. It accounts for 0.1% of the surgical pathologies of the thyroid gland. The anatomical and physiological characteristics of the gland give it resistance to pathogens. Streptococcal and Staphylococcal are the most common. Tuberculosis is rarely reported in the literature. The occurrence of infection associated with toxic goiter is exceptional. The authors report a rare case of a 22-year-old young patient with thyroid abscess revealing a toxic goitre. He presented to our otorhinolaryngology emergency unit with anterior cervical swelling, slightly lateralized to the left, moving on swallowing, associated with hemoptysis, signs of thyroid dysfunction, fever, night sweats...
2016: Pan African Medical Journal
https://www.readbyqxmd.com/read/27763712/conservation-implications-of-a-lack-of-relationship-between-baseline-glucocorticoids-and-fitness-in-a-wild-passerine
#6
Christine L Madliger, Oliver P Love
The application of physiological measures to conservation monitoring has been gaining momentum and, while a suite of physiological traits are available to ascertain disturbance and condition in wildlife populations, glucocorticoids (i.e., GCs; cortisol and corticosterone) are the most heavily employed. The interpretation of GC levels as sensitive indicators of population change necessitates that GCs and metrics of population persistence are linked. However, the relationship between GCs and fitness may be highly context-dependent, changing direction, or significance, depending on the GC measure, fitness metric, life history stage, or other intrinsic and extrinsic contexts considered...
December 2016: Ecological Applications: a Publication of the Ecological Society of America
https://www.readbyqxmd.com/read/27757239/employing-individual-measures-of-baseline-glucocorticoids-as-population-level-conservation-biomarkers-considering-within-individual-variation-in-a-breeding-passerine
#7
Christine L Madliger, Oliver P Love
Labile physiological variables, such as stress hormones [i.e. glucocorticoids (GCs)], allow individuals to react to perturbations in their environment and may therefore reflect the effect of disturbances or positive conservation initiatives in advance of population-level demographic measures. Although the application of GCs as conservation biomarkers has been of extensive interest, few studies have explicitly investigated whether baseline GC concentrations respond to disturbances consistently across individuals...
2016: Conservation Physiology
https://www.readbyqxmd.com/read/27741416/utility-of-superiorly-based-masseter-muscle-flap-for-postablative-retromaxillary-reconstruction
#8
Chandrashekhar R Bande, Akshay Mishra, M K Gupta, Manu Goel, Mayur J Gawande
PURPOSE: Resections in the posterior component of the oral cavity usually lead to severe functional compromise and lower quality of life for patients. Notable advances in reconstruction of the posterior part of the mouth and of the oropharynx have occurred in recent decades. The anatomic and physiologic rehabilitation of the defect to a reasonable outcome with low morbidity and mortality remains the founding basis of any surgical reconstruction, which also holds true for oral oropharyngeal and retromaxillary reconstructions...
September 17, 2016: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/27733188/nurse-performed-screening-for-postextubation-dysphagia-a-retrospective-cohort-study-in-critically-ill-medical-patients
#9
Kay Choong See, Si Yu Peng, Jason Phua, Chew Lai Sum, Johncy Concepcion
BACKGROUND: Swallowing difficulties are common, and dysphagia occurs frequently in intensive care unit (ICU) patients after extubation. Yet, no guidelines on postextubation swallowing assessment exist. We aimed to investigate the safety and effectiveness of nurse-performed screening (NPS) for postextubation dysphagia in the medical ICU. METHODS: We conducted a retrospective cohort study of mechanically ventilated patients who were extubated in a 20-bed medical ICU...
October 12, 2016: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/27719865/functional-disorders-of-swallowing
#10
A Baumann, P O Katz
Swallowing involves complex coordination of the neuromuscular anatomy and physiology of the oropharynx and esophagus, controlled by the enteric and central nervous systems. Dysphagia is classified as either oropharyngeal or esophageal and results from mechanical or structural disturbances. Videofluoroscopy, fiberoptic endoscopic evaluation of swallowing, barium swallow, manometry, and endoscopy are common modalities utilized in diagnosis, but none is as important as a patient's history. Functional dysphagia is a diagnosis of exclusion and is based on Rome criteria...
2017: Handbook of Clinical Neurology
https://www.readbyqxmd.com/read/27712846/methylation-of-the-circadian-clock-gene-in-the-offspring-of-a-free-living-passerine-bird-increases-with-maternal-and-individual-exposure-to-pm10
#11
Andrea Romano, Barbara De Giorgio, Marco Parolini, Chiara Favero, Cristina Daniela Possenti, Simona Iodice, Manuela Caprioli, Diego Rubolini, Roberto Ambrosini, Luca Gianfranceschi, Nicola Saino, Valentina Bollati
The consequences of exposure to particulate matter (PM) have been thoroughly investigated in humans and other model species, but there is a dearth of studies of the effects of PM on physiology and life-history traits of non-human organisms living in natural or semi-natural environments. Besides toxicological relevance, PM has been recently suggested to exert epigenetic effects by altering DNA methylation patterns. Here, we investigated for the first time the association between the exposure to free-air PM10 and DNA methylation at two loci ('poly-Q exon' and '5'-UTR') of the Clock gene in blood cells of the nestlings of a synanthropic passerine bird, the barn swallow (Hirundo rustica)...
January 2017: Environmental Pollution
https://www.readbyqxmd.com/read/27712811/feeding-management-in-infants-with-craniofacial-anomalies
#12
Jill M Merrow
The instinctual drive to gain nourishment can become complicated by structural differences, physiologic instability and environmental influences. Infants with craniofacial anomalies may experience significant feeding and swallowing difficulties related to the type and severity of the anomalies present as well as social-emotional interactions with caregivers. Typical outcome measures and feeding goals are discussed. Details regarding clinical and instrumental evaluation, including fiberoptic endoscopic evaluation of swallowing and modified barium swallow study, as well as management techniques are reported...
November 2016: Facial Plastic Surgery Clinics of North America
https://www.readbyqxmd.com/read/27707722/vagal-afferent-activation-induces-salivation-and-swallowing-like-events-in-anesthetized-rats
#13
Hirotaka Ueda, Mayu Suga, Takakazu Yagi, Ikue Kusumoto-Yoshida, Hideki Kashiwadani, Tomoyuki Kuwaki, Shouichi Miyawaki
The aim of this study was to clarify the effect of vagal afferent activation on salivation and swallowing-like events. Salivation is part of a reflex induced by stimulation of the oral area during feeding or chewing. Recently, we reported that nausea induced by gastro-esophageal reflux (GER) activation produced salivation and swallowing in humans. Here, we investigated the ability of visceral sensation to enhance salivation and swallowing in rodents in order to inform the mechanism of GER-mediated stomatognathic activation...
October 5, 2016: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/27701706/pediatric-feeding-swallowing-yesterday-today-and-tomorrow
#14
Maureen A Lefton-Greif, Joan C Arvedson
Speech-language pathologists (SLPs) have played primary roles in the evaluation and management of children with feeding/swallowing disorders for more than five decades. Medical, surgical, and technological advances have improved the survival of young fragile infants and children, many of whom will present with feeding/swallowing problems. Regardless of their underlying etiologies, many of these children are at risk for aspiration-induced lung disease, undernutrition or malnutrition, developmental deficits, and stressful interactions with their caregivers...
November 2016: Seminars in Speech and Language
https://www.readbyqxmd.com/read/27646052/carbonation-as-a-sensory-enhancement-strategy-a-narrative-synthesis-of-existing-evidence
#15
Leisa G Turkington, Elizabeth C Ward, Anna M Farrell
PURPOSE: Sensory enhancement techniques, like other compensatory strategies, aim to reduce dysphagia symptoms. The use of carbonated liquids has been proposed as a possible sensory technique, however to date, there is limited information of its efficacy or guidance for clinical implementation. A narrative synthesis was completed to determine the quality and strength of the evidence base for use of carbonation as a compensatory strategy in dysphagia rehabilitation. METHODS: From 101 articles initially identified, 14 articles met the study criteria...
September 19, 2016: Disability and Rehabilitation
https://www.readbyqxmd.com/read/27633400/potential-of-in-vivo-real-time-gastric-gas-profiling-a-pilot-evaluation-of-heat-stress-and-modulating-dietary-cinnamon-effect-in-an-animal-model
#16
Jian Zhen Ou, Jeremy J Cottrell, Nam Ha, Naresh Pillai, Chu K Yao, Kyle J Berean, Stephanie A Ward, Danilla Grando, Jane G Muir, Christopher J Harrison, Udani Wijesiriwardana, Frank R Dunshea, Peter R Gibson, Kourosh Kalantar-Zadeh
Gastroenterologists are still unable to differentiate between some of the most ordinary disorders of the gut and consequently patients are misdiagnosed. We have developed a swallowable gas sensor capsule for addressing this. The gases of the gut are the by-product of the fermentation processes during digestion, affected by the gut state and can consequently provide the needed information regarding the health of the gut. Here we present the first study on gas sensor capsules for revealing the effect of a medical supplement in an animal (pig) model...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27626140/the-challenges-of-dysphagia-management-and-rehabilitation-in-two-complex-cases-post-chemical-ingestion-injury
#17
Anna F Rumbach, Rebecca Cremer, Astra Chatwood, Sari Fink, Sadaf Haider, Michelle Yee
Purpose: Dysphagia is common sequelae of chemical ingestion injury, resulting from damage to critical swallowing structures. From a speech-language pathology perspective, this study outlines the physiological deficits in 2 individuals with severe injury (1 woman, acid; 1 man, alkali) and the pattern of dysphagia rehabilitation and recovery. Method: A retrospective chart review of clinical and instrumental assessments was conducted to examine swallow characteristics and speech-language pathology management (compensatory and rehabilitation strategies) at multiple time points...
November 1, 2016: American Journal of Speech-language Pathology
https://www.readbyqxmd.com/read/27625188/therapeutic-intervention-in-oropharyngeal-dysphagia
#18
Rosemary Martino, Timothy McCulloch
Oropharyngeal dysphagia is a frequent consequence of several medical aetiologies, and even considered part of the normal ageing process. Early and accurate identification provides the opportunity for early implementation of dysphagia treatments. This Review describes the current state of the evidence related to dysphagia therapies - focusing on treatments most clinically utilized and of current interest to researchers. Despite successes in select studies, the level of evidence to support the efficacy of these treatments remains limited...
November 2016: Nature Reviews. Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/27624852/exploring-beyond-the-oral-mucosa-in-patients-affected-with-autoimmune-blistering-diseases-the-importance-of-endoscopic-procedures
#19
A España, S Fernandez
Autoimmune blistering diseases (AIBD) comprise several entities characterized by the presence of autoantibodies targeted against structural proteins either in desmosomes or in the dermoepidermal junction of polystratified squamous epithelium. Patients develop blisters, erosions in cutaneous surfaces or mucosas. Diagnosis is based on the characteristic mucocutaneous lesions, the typical findings on histological studies and direct immunofluorescence assays, and the presence of specific autoantibodies against the epidermal antigens...
September 14, 2016: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/27612519/stem-cell-based-tissue-engineered-laryngeal-replacement
#20
Tahera Ansari, Peggy Lange, Aaron Southgate, Karin Greco, Carla Carvalho, Leanne Partington, Anthony Bullock, Sheila MacNeil, Mark W Lowdell, Paul D Sibbons, Martin A Birchall
: : Patients with laryngeal disorders may have severe morbidity relating to swallowing, vocalization, and respiratory function, for which conventional therapies are suboptimal. A tissue-engineered approach would aim to restore the vocal folds and maintain respiratory function while limiting the extent of scarring in the regenerated tissue. Under Good Laboratory Practice conditions, we decellularized porcine larynges, using detergents and enzymes under negative pressure to produce an acellular scaffold comprising cartilage, muscle, and mucosa...
September 9, 2016: Stem Cells Translational Medicine
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