Search Results
Results 451 - 500 of 1631
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Puria Sunil - - 2005
AIMS: To determine 1) the best position for hydroxylapatite malleus-to-footplate (MFP), ossicular replacement prosthesis (ORP) in reconstructed ears, and 2) whether preserving the stapes superstructure (SS), when present, has acoustic advantages. BACKGROUND: Positioning of the MFP-ORP head beneath the neck of the malleus may produce maximal force, whereas positioning beneath ...
Kumar S - - 2005
OBJECTIVE: Foreign bodies in the ear are mainly encountered in children. This can often pose a problem especially in an accident and emergency department where a microscope or expert help is not routinely available. This paper presents a simple, safe, and effective way of ear syringing. The ease and simplicity ...
Epstein Scott K - - 2005
The trachea is easily accessible at the bedside. As such it provides ready access for emergency airway cannulation (eg, in the setting of acute upper airway obstruction) and for chronic airway access after laryngeal surgery. More commonly, tracheostomy tubes are placed to allow removal of a translaryngeal endotracheal tube. Tracheostomy ...
Graves John W - - 2005
OBJECTIVE: Self-measurement of blood pressure using an automated home blood pressure monitoring (AHBPM) is increasingly used in hypertension management. Internet commerce increases dramatically each year. This study looked to identify the availability of validity of AHBPM and the correct cuff size to go with the AHBPM. METHODS AND RESULTS: Using ...
Challis M J - - 2005
We investigated the effect of pneumatic pressure applied to the proximal musculature of the sheep foreleg on load at the site of a transverse osteotomy of the distal radius. The distal radii of 10 fresh sheep foreleg specimens were osteotomized and a pressure sensor was inserted between the two bone ...
Klarskov Niels - - 2005
Pressure reflectometry is a new and easily applicable technique for simultaneous measurement of cross-sectional area and pressure in a collapsible biological tube. Related values of pressure and cross-sectional area are relevant for assessment of the mechanical properties of a biological tube. A very thin and highly flexible 6 cm long ...
Therkildsen Anette G - - 2005
HYPOTHESIS: Modern tympanometers run at higher rates of pressure change than older tympanometers, which increases the inaccuracy of determining the middle ear pressure. BACKGROUND: Tympanometric middle ear pressure may be susceptible to both the direction as well as the rate of pressure change, which is reflected by two different pressure ...
Doneley Sarah - - 2005
We tested the hypothesis that the life-span of the ProSeal laryngeal mask airway (LMA) is shorter than the Classic LMA. We also compared residual cuff volumes and changes in elastance and permeability with use. Six new size 4 ProSeal LMAs and 6 new size 4 Classic LMAs were tested. Each ...
Kolodjaschna Julia - - 2005
PURPOSE: To compare dynamic autoregulation in the middle cerebral artery (MCA) and the ophthalmic artery (OA) after a step decrease in systemic blood pressure. METHODS: Eighteen healthy male young subjects were studied. Ultrasound parameters and systemic blood pressures were recorded in each subject before, during, and after a step decrease ...
Franz Burkhard - - 2005
Patients suffering from Ménière's disease are particularly sensitive to negative pressure in the middle ear. For example, attacks of vertigo can be triggered by a descent in an aircraft when ventilation of the middle ear can become critical. Positive-pressure pulse treatment has been shown to have a beneficial effect on ...
Gaihede Michael - - 2005
HYPOTHESIS: Tympanometric measurements of middle ear pressure in children with secretory otitis media are overestimated in a dose-response manner because of increased hysteresis explained by the viscosity and amount of middle ear fluid. BACKGROUND: Tympanometric middle ear pressure is important in evaluating children with secretory otitis media. These measurements are ...
Nishiyama Tomoki - - 2005
The purpose of this study was to compare the cuff pressures of three tracheostomy tubes, MERA sofit CLEAR, Blue Line Tracheostomy Tube, and Tracheosoft. Each tracheostomy tube with an internal diameter of 7.0 mm was put into a plastic column. The cuff was then inflated with air to seal the ...
Touzot-Jourde Gwenola - - 2005
OBJECTIVE: To investigate the effect of endotracheal tube cuff inflation pressure on the occurrence of liquid aspiration and tracheal wall damage. STUDY DESIGN: Prospective, randomized experimental study. ANIMALS: Ten healthy horses, weighing 535 +/- 55 kg. METHODS: Horses were anesthetized, orotracheally intubated, placed in dorsal recumbency, and maintained on isoflurane ...
Woltjen John A - - 2005
BACKGROUND: This study addressed the question of whether barotrauma during colonoscopy is sufficient to rupture the colon. METHODS: A total of 3000 colonoscopies were retrospectively analyzed, and the colonoscopes used for these procedures were evaluated in an in vitro analysis. Air pressure at the tip of the colonoscopes and air ...
Kanick Stephen Chad - - 2005
Middle ear barotrauma during flight is a painful disorder experienced by passengers who cannot properly regulate their middle ear pressure in response to the changing cabin pressures during ascent and descent. Previous reports emphasized the important role of poor eustachian tube function in disease pathogenesis but paid little attention to ...
Dullenkopf Alexander - - 2004
PURPOSE: To compare cuff pressures during nitrous oxide exposure in the new Microcuff pediatric tracheal tube (MPT) with ultrathin high volume - low pressure polyurethane cuff to a tube with a standard polyvinyl chloride (PVC) cuff. METHODS: With approval of the local Ethics Committee, 30 pediatric patients requiring tracheal intubation ...
Bergadano A - - 2004
During anaesthesia for elective procedures, 2 dogs developed acute airway obstruction caused by herniation of the endotracheal cuff. This is an uncommon but potentially fatal complication especially when minimal monitoring of the patient leads to late recognition of the condition. The most typical symptoms are decreased thoracic excursions and tidal ...
Feijen R A - - 2004
The resistance for fluid flow of the cochlear aqueduct was measured in guinea pigs for different positions of the round window membrane. These different positions were obtained by applying different constant pressures to the middle ear cavity. Fluid flow through the aqueduct was induced by small pressure steps superimposed on ...
Niizeki Kyuichi - - 2005
The synchronization of cardiac and locomotor rhythms has been suggested to enhance the efficiency of arterial delivery to active muscles during rhythmic exercise, but direct evidence showing such a functional role has not been provided. In this study, we tested the hypothesis that the heartbeat is coupled with intramuscular pressure ...
Mac Murdo Stanley D - - 2004
We studied the use of an inline syringe as a pressure relief valve for tracheal tube cuffs during exposure to nitrous oxide to see if the technique works. Bench testing was done to determine the stick and slip characteristics of syringes of different brands and sizes. Cuffs were inflated with ...
Cinamon Udi - - 2004
OBJECTIVE: To question the conception of Eustachian tube (ET) dysfunction by investigating some of its passive and active properties. BACKGROUND: Middle ear (ME) fluid accumulation accompanied by a negative pressure is generally accepted to be induced by ET dysfunction, implying that the origin of pathology is within the tube. METHODS: ...
Younger Alastair S E - - 2004
We examined the amount of thigh tourniquet pressure that can be reduced from the typical 300 to 350 mm Hg by using a new automated plethysmographic limb occlusion pressure measurement technique. We also examined how much pressure could be reduced by using a wide contoured cuff compared with a standard ...
Morinaka Setsuko - - 2004
The middle ear pressure was analyzed in 112 patients with dizziness. In 37 patients with Meniere's disease, the middle ear pressure on the low-pressure side was significantly lower, the middle ear pressure difference (between the high and low sides) was significantly larger, and the maximum compliance on the low-compliance side ...
Boqué M C - - 2004
OBJECTIVE: To quantify the incidence and degree of endotracheal tube intraluminal obstruction after mechanical ventilation and its relation to time of intubation. DESIGN: Prospective observational study. SETTING: A 14-bed medical-surgical intensive care unit at a university-affiliated teaching hospital. PATIENTS: Ninety-four endotracheal tubes used in 80 patients requiring mechanical ventilation for ...
Effat Kamal G - - 2004
Narghile (water-pipe) smoking requires the generation of significant negative intrapharyngeal pressure, which may be transmitted to the middle ear through the Eustachian tube. A total of 80 ears from regular narghile smokers were examined otoscopically and by tympanometry. Seventy ears from heavy cigarette smokers were similarly examined and served as ...
Keller Christian - - 2004
PURPOSE: We compare the Soft Seal and Unique single-use, plastic laryngeal mask airway devices with respect to intracuff pressure, directly measured mucosal pressure and in vitro elastance. METHODS: Ten fresh male cadavers were studied. Microchip pressure sensors were attached to the following locations: A) the anterior middle part of the ...
Dullenkopf Alexander - - 2004
BACKGROUND: The aim of the study was to compare sealing characteristics of the new Microcuff pediatric tracheal tube featuring a high volume-low pressure (HVLP) cuff with ultrathin membrane with three conventional pediatric cuffed tracheal tubes. METHODS: After obtaining approval of the local ethical committee, 80 children aged 2-4 years were ...
Altinok T - - 2004
AIM: To investigate the diagnostic value of ultrasonography in mild and moderate idiopathic carpal tunnel syndrome (CTS). MATERIALS AND METHODS: Cross-sectional areas (CSA), flattening ratios at three different levels, swelling ratio, and palmar displacement were analysed in 26 patients (14 with bilateral and 12 with unilateral disease, 40 wrists in ...
Valk W L - - 2004
OBJECTIVE: To determine a relation between acute inner ear pressure changes and cochlear function as measured by low-level 2f(1)-f(2) distortion product otoacoustic emissions (DPOAEs). MATERIAL AND METHODS: During and after a change in inner ear pressure induced by injection or aspiration of perilymph, the 2f(1)-f(2) DPOAE at 4.5 kHz generated ...
Voss Susan E - - 2004
Reported here is a technique for measuring forward and reverse middle-ear transmission that exploits distortion-product otoacoustic emissions (DPOAEs) to drive the middle ear "in reverse" without opening the inner ear. The technique allows measurement of DPOAEs, middle-ear input impedance, and forward and reverse middle-ear transfer functions in the same animal. ...
Dullenkopf A - - 2004
BACKGROUND: The aim of this study was to investigate cuff compliance and cuff pressure during nitrous oxide exposure in the recently introduced Microcuff tracheal tube with a polyurethane cuff (Microcuff GmbH, Weinheim, Germany), and to compare it to conventional tracheal tubes with PVC cuffs. METHODS: In an in vitro set ...
Bajaj Pramila P Department of Anesthesiology & Critical Care, RNT Medical College & Associated Group of Hospitals, Udaipur-313004 Rajasthan (India). - - 2004
The study was designed to investigate the changes in pressure and volume of a tracheal tube-cuff inflated with air, mixture of N2O + O2, saline and 4% lidocaine during nitrous oxide anesthesia. This study was conducted in 80 patients (33 male & 47 female). The pressure and volume of a ...
Mueller Patrick J - - 2004
Excitatory amino acid (EAA) transmission in the rostral portion of the ventrolateral medulla (RVLM) appears to be required for reflex airway constriction. The purpose of the present study was to determine whether our prior observations of right sided dominance are also reflected at the level of the RVLM, particularly at ...
Søgaard K - - 2006
The electromyogram (EMG) and intramuscular pressure (IMP) increase linearly with force during voluntary static contractions, while the surface mechanomyogram (MMG) increases linearly only up to approximately 70% of the maximal voluntary contraction (MVC) and then levels off. The aim of this study was to investigate the possible influence of IMP ...
Sadé Jacob - - 2004
HYPOTHESIS: Both a normal and a narrowed eustachian tube (ET) are capable of equilibrating pressures between the middle ear (ME) and the atmosphere almost instantaneously. OBJECTIVES: The objective of this study was to assess experimentally the effect of narrowing a simulated ET isthmus on air passage into the ME. METHODS: ...
Hyams A F - - 2004
A facial nerve palsy, as a result of middle-ear high pressure, is a rare complication of sub-aqua diving. It may occur as a result of an acute pressure change in the middle ear during ascent in those patients who have experienced difficulty equalizing their middle-ear pressure during the prior descent. ...
Puech P - - 2004
We have examined the stability of double wall carbon nanotubes under hydrostatic pressures up to 10 GPa. The tangential optical phonon mode observed by inelastic light scattering is sensitive to the in-plane stress and splits into a contribution associated with the external and internal tube. While the pressure coefficient from ...
Voronov Dmitry A - - 2004
Cardiac looping is a vital morphogenetic process that transforms the initially straight heart tube into a curved tube normally directed toward the right side of the embryo. While recent work has brought major advances in our understanding of the genetic and molecular pathways involved in looping, the biophysical mechanisms that ...
Laurens-Thalen Elisabeth O - - 2004
OBJECTIVE: The cochlear aqueduct connects the scala tympani to the subarachnoid space and is the main pressure equalization canal for the inner ear. Increases in inner ear volume and pressure are thought to cause clinical symptoms such as vertigo, tinnitus and fluctuating hearing loss. In this study the flow resistance ...
Squires Todd M - - 2004
Benign paroxysmal positional vertigo (BPPV) is a mechanical disorder of the vestibular system in which calcite particles called otoconia interfere with the mechanical functioning of the fluid-filled semicircular canals normally used to sense rotation. Using hydrodynamic models, we examine the two mechanisms proposed by the medical community for BPPV: cupulolithiasis, ...
Braz José Reinaldo Cerqueira - - 2004
STUDY OBJECTIVES: To study endotracheal tube (ETT) cuff pressures during nitrous oxide (N2O) anesthesia when the cuffs are inflated with air to achieve sealing pressure, and to evaluate the frequency of postoperative laryngotracheal complaints. DESIGN: Prospective, randomized, blind study. SETTING: Metropolitan teaching hospital. PATIENTS: 50 ASA physical status I and ...
Devys J-M - - 2004
BACKGROUND: Tracheal mucosal damage related to tracheal intubation has been widely described in pediatric and adult patients. High volume-low pressure cuffs (HVLPC) are being advertised as safe to avoid this particularly unpleasant complication. Compliances of these supposed pediatric and adult HVLPC are not mentioned by manufacturers and still remain unknown. ...
Okazaki Junko - - 2004
Infantile tracheomalacia is a potentially life-threatening disease requiring prolonged artificial respiratory support. Diagnosis and management of this disease may be further improved by establishing a suitable objective and quantitative assessment protocol for tracheal collapsibility. It is our hypothesis that tracheal collapsibility can be represented by the relationship between intraluminal pressure ...
Heise Michael - - 2004
OBJECTIVE: To describe the local hemodynamics and pressure losses of crural bypass anastomoses using instantaneous velocity fields acquired by particle image velocimetry (PIV). METHODS: Silastic models of a Taylor patch, a Miller cuff and a femoro-crural patch prosthesis (FCPP) were attached to a circuit driven by a Berlin Heart, providing ...
Thiede Oliver - - 2004
The major symptoms of glomus tympanicum tumors are pulsatile tinnitus and spontaneous impedance changes (SICs) of the middle ear. On the other hand, SICs often occur even in the absence of pathological findings. The aim of this study was to analyze the occurrence of SICs in patients and healthy volunteers. ...
Conway D H - - 2004
Continuous flow positive pressure devices bridge the gap between mechanical and unsupported ventilation in patients recovering from critical illness. At this point, patients are often fully awake, yet the inflated tracheostomy cuff prevents them from speaking or swallowing. The aim of this study was to investigate the effects of cuff ...
Chi Fang-Lu - - 2004
OBJECTIVE: The objective of this study was to investigate the effect on experimental endolymphatic hydrops in guinea pigs after hyperbaric therapy. BACKGROUND: The histopathologic character of Ménière's disease is the presence of endolymphatic hydrops. Endolymphatic hypertension could be one of the factors resulting from endolymphatic hydrops. Some treatments of Ménière's ...
van Zundert A A J - - 2004
BACKGROUND AND OBJECTIVE: There are concerns over the intra-cuff pressure of the laryngeal mask and laryngopharyngeal morbidity. In a randomized study, the authors compared cuff-pressure changes in the LMA-Classic and the new disposable Soft Seal laryngeal mask during nitrous oxide anaesthesia. METHODS: Two-hundred adult patients were randomly assigned to a ...
Mareels Guy - - 2004
Central venous catheters are widely used as a hemoaccess method for dialysis therapy. In this study, the performance parameters (velocities, pressure drop, shear rates, access recirculation) of the Niagara catheter are analyzed using computational fluid dynamics. Side holes are left open, closed, or reduced in size to assess the influence ...
Schröder Wolfgang - - 2004
BACKGROUND AND AIMS: The formation of a gastric tube is associated with partial devascularisation of the stomach and impaired tissue perfusion in the anastomotic region. The aim of the study was to gain data on the time interval of microcirculatory recovery of the normal gastric conduit. PATIENTS AND METHODS: Twenty-nine ...
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