Bronchoscopic findings in dogs with bronchial vegetal foreign bodies: 84 cases (2010-2020).

OBJECTIVES: To describe endoscopic findings, foreign body location, success rate of removal and complications in dogs with bronchial vegetal foreign bodies. MATERIALS AND METHODS: The current study retrospectively evaluated the case records of dogs diagnosed with bronchial vegetal foreign bodies at a veterinary hospital centre between January 2010 and April 2020. Information retrieved included breed, sex, age, bodyweight, the season of presentation, presentation and duration of clinical signs, previous removal attempts performed by the referring veterinarian, foreign body location and endoscopic and imaging findings. RESULTS: Eighty-four cases were included. Fifty-nine dogs (70%) presented during spring and summer. Cough (77 of 84; 92%) and fever (15 of 84; 18%) were the main clinical signs. One to 10 bronchial vegetal foreign bodies were removed from each dog. Purulent exudate was observed in the ventral larynx, trachea and bronchi in 49 (65%), 61 (81%) and 71 (95%) dogs, respectively. In most cases, only the barbules of the vegetal foreign bodies were initially observed during endoscopy. The presence of large bronchial nodules or an irregular mucosal surface was a frequent finding (62 of 75; 83%). Mild bleeding was the main complication (58 of 75; 77%) of endoscopic removal, which was successful in 67 of the 84 (80%) cases. CLINICAL SIGNIFICANCE: Mucosal nodules associated with purulent material within the airways are frequent endoscopic findings in dogs with bronchial vegetal foreign bodies. Bronchoscopy is a relatively safe and useful technique for diagnosis and treatment of bronchial vegetal foreign bodies in dogs.

Transmural migration of a subcutaneous ureteral bypass into the intestine in three cats.

Subcutaneous ureteral bypass™ is a device placed in cats with ureteral obstruction. The most common complications include system occlusion, urinary tract infection and sterile cystitis. In this case series, we describe three cats with subcutaneous ureteral bypass devices placed where transmural migration of subcutaneous ureteral bypass catheters into the small intestine resulted in gastrointestinal signs, urinary infection and subcutaneous ureteral bypass occlusion. The system was changed in one case and removed in the other two. In all cases, an intestinal resection and anastomosis was performed. All cats had a good medium-term outcome, and urinary infection persisted in the case for which the subcutaneous ureteral bypass system was changed. Transmural migration of the device should be ​considered in cats with subcutaneous ureteral bypass presenting with persistent urinary tract infection, gastrointestinal signs or device obstruction, even if imaging studies such as ultrasound or contrast studies do not demonstrate any abnormalities.

Adsorption of randomly annealed polyampholytes at the silica-water interface.

We have investigated the adsorption of randomly annealed polyampholytes containing [2-(dimethylamino)ethyl methacrylate)] (DMAEMA), methacrylic acid (MAA), and [3-(2-methylpropionamido)propyl] trimethylammonium chloride (MAPTAC) with various molar compositions. The adsorption was performed from dilute aqueous solutions onto silicon substrates. The adsorbed layers were characterized by reflectivity techniques such as reflectometry, ellipsometry, and neutron specular reflection. As expected for annealed polyampholytes, the adsorption was found to depend strongly on the pH, with a maximum within the isoelectric domain of the polyampholyte. The monomer volume fraction profiles of the adsorbed layers were determined from neutron specular reflection measurements. In the isoelectric domain, the polyampholyte chains adopt a compact conformation, with a layer thickness of about 60 A. The polyampholyte layer is as dense as the adsorbed layer of fully charged polyelectrolyte but much thicker. Finally, we found that changing the ratio of neutral units along the polyampholyte chain in the isoelectric domain had no significant effect on the concentration profile of the adsorbed layer.

Low Hydrophobically Modified Poly(Acrylic Acid) Stabilizing Macroemulsions: Relationship between Copolymer Structure and Emulsions Properties

Low hydrophobically modified (with dodecylamide chain) linear poly(acrylic acid) sodium salts (LHMPAANa) of various degrees of grafting (tau) and molecular weights were synthesized and used as emulsifiers of the n-dodecane/water (NaNO3 10(-3) M) system. Stability and flow properties of the resulting n-dodecane in water emulsions (dispersed phase volume fraction = 0.5) were investigated as a function of tau (tau = 0 to 10% in mol), molecular weight (5000, 50,000, and 150,000 g/mol) and polymer concentration (0 to 10%). It was clearly shown that viscosification (via an associating mechanism of LHMPAANa) of the external phase of emulsions is a key factor in explaining dispersion breakdown. However, a complete description of the phenomenon could not be achieved without considering the adsorption of the polymer at the liquid-liquid interface which depends closely on tau but not much on molecular weight. The molecular weight effects were found to be restricted to the viscosification of the outer phase. Copyright 1998 Academic Press. Copyright 1998Academic Press

Fluidification of Concentrated Aqueous Colloidal Silica Suspensions by Adsorption of Low-Molecular-Weight Poly(ethylene oxide).

This paper deals with the effect of different low-molecular-weight poly(ethylene oxide)s on the rheology of concentrated aqueous colloidal silica suspensions (volume fraction >0.2) with the aim of obtaining well-dispersed media. Results are correlated with the physico-chemical characteristics of the systems that govern the ranges of the various operating interactions, i.e., mainly surface coverage, molecular weight of the polymer, and ionic strength of the medium. Optimization of the fluidification occurs to be strongly linked to these parameters. An unexpected effect of free polymer bulk concentration leads to improved fluidification when the characteristic lengths of the system are correctly adjusted; it has been interpreted in the frame of recent theories. Copyright 2000 Academic Press.