Search Results
Results 301 - 350 of 1627
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Ehrenfeld Jesse M - - 2008
BACKGROUND: Left-sided double-lumen tubes are perceived to be safer than right-sided tubes, because they may be less prone to malposition. If this is true, then the incidence and severity of hypoxemia, hypercapnea, and high airway pressures should be higher for right-sided tubes during thoracic surgery than for left-sided tubes. METHODS: ...
de la Rochefoucauld O O Department of Otolaryngology, Head and Neck Surgery, Columbia University, 630 West 168th Street, New York, NY, 10032, USA, - - 2008
Recent measurements of three-dimensional stapes motion in gerbil indicated that the piston component of stapes motion was the primary contributor to intracochlear pressure. In order to make a detailed correlation between stapes piston motion and intracochlear pressure behind the stapes, simultaneous pressure and motion measurements were undertaken. We found that ...
Saeki Hiroshi - - 2008
A nude-type hot-cathode-ionization-gauge head with correcting electrode and shield tube, succeeded in reducing practical pressure-measurement errors caused by an influx of photoelectrons in a synchrotron radiation environment. In the development of this modified Bayard-Alpert hot-cathode-ionization gauge, experimental results showed that a basic ion current generated around the correcting electrode by ...
Markarian Mark K - - 2008
A 15 year old male was an unrestrained passenger in a high speed motor vehicle crash followed by ejection. The patient was noted to have evidence of bilateral pneumothorax upon arrival in the Emergency Department. Bilateral chest tubes were placed under sterile conditions; however, the left pneumothorax remained, and a ...
Brännström Jonas - - 2008
The effects of hypobaric pressure chamber exposure was measured in noise in ten patients with monaural fluctuating low-frequency hearing loss (FLFHL) such as Meniere's disease using psychophysical tuning curves (PTC), transiently evoked otoacoustic emissions (TEOAE), binaural pitch matches and speech recognition scores (SRS) in noise. In the literature, reversible hearing ...
Gutovitz Scott - - 2008
OBJECTIVES: Altitude-related otic barotrauma and its symptoms have been identified from air-travel, scuba diving, and hyperbaric chambers, but not in skydiving. It is not known whether skydiving-related otic barotrauma could cause symptoms severe enough for medical attention or be implicated in skydiving-related accidents. This study assessed the effect of altitude ...
Brito Flavia Carneiro - - 2008
Apart from the well-studied melanocytes of the skin, eye and inner ear, another population has recently been described in the heart. In this study, we tracked cardiac melanoblasts using in situ hybridization with a dopachrome tautomerase (Dct) probe and Dct-LacZ transgenic mice. Large numbers of melanoblasts were found in the ...
Qin Shengping S Department of Biomedical Engineering, University of California, Davis, CA, USA. - - 2008
Silica, cellulose and polymethylmethacrylate tubes with inner diameters of ten to a few hundred microns are commonly used as blood vessel phantoms in in vitro studies of microbubble or nanodroplet behavior during insonation. However, a detailed investigation of the ultrasonic fields within these micro-tubes has not yet been performed. This ...
Horisberger T - - 2008
We compared three different tracheal wall pressure measuring techniques in vitro. Using a high-volume, low-pressure, cuffed tracheal tube with an internal diameter of 7.5 mm and a model trachea, the pressure difference technique, the wall pressure membrane technique and the microchip sensor probe technique with and without lubrication were studied. ...
Sole Mary Lou - - 2008
Continuous monitoring and download of endotracheal tube cuff pressure for a 12-hour period were required to collect data for an ongoing program of research related to airway management of the critically ill patient. On the basis of reports from the anesthesia literature, continuous monitoring of cuff pressure via a traditional ...
Vanner R - - 2008
The purpose of this bench-top study was to determine the subatmospheric tracheal pressures that could be generated by different sizes of suction catheters when placed into the different sizes of tracheal tubes encountered in adult anaesthetic practice. Five sizes of suction catheter were studied from 8 to 16 Fr and ...
Zanella Alberto - - 2008
OBJECTIVE: We designed a new endotracheal tube (ETT) cuff that does not form the folds that cause leakage of colonized subglottic secretions upon inflation within the trachea: a standard high-volume low-pressure cuff was draped with a second, highly elastic cuff made of a low-protein guayule natural latex rubber with 0.5 ...
Smith Kelly A - - 2008
We have used high-resolution 4D imaging of cardiac progenitor cells (CPCs) in zebrafish to investigate the earliest left-right asymmetric movements during cardiac morphogenesis. Differential migratory behavior within the heart field was observed, resulting in a rotation of the heart tube. The leftward displacement and rotation of the tube requires hyaluronan ...
Lucangelo Umberto - - 2008
OBJECTIVE: To test the effects of positive expiratory pressure on the leakage of fluid around cuffs of different tracheal tubes, in mechanically ventilated patients and in a benchtop model. DESIGN: Randomized clinical trial and experimental in vitro study. SETTING: Intensive care unit of a university hospital. PATIENTS: Forty patients recovering ...
El-Khatib M F - - 2008
BACKGROUND AND OBJECTIVES: Partial obstruction of endotracheal tubes due to accumulation of secretions and mucus plugs can increase the tube resistance and subsequently impose increased resistive load on the patient. This study was performed to determine the changes in the resistance of endotracheal tubes of sizes 7.5, 8.0 and 8.5 ...
Franz Burkhard - - 2008
In an animal model, we examined the extratympanic electrocochleographic response to static pressure changes (middle-ear pressure and intracranial pressure [ICP]) with attention to the summating potential (SP), action potential (AP), and the SP/AP ratio. With a closed middle ear, raised or lowered middle-ear pressure and raised or lowered ICP resulted ...
Mittal Parul - - 2008
ABSTRACT: BACKGROUND: A bloodless operative field is considered mandatory for most surgical procedures on the upper and lower extremity. This is accomplished by using either an Esmarch bandage or a pneumatic tourniquet, but a number of complications are associated with both. Nerve palsy is one of the most frequently encountered ...
Todt Ingo - - 2008
The Eustachian (or auditory) tube is of central importance for the regulation of ambient air pressure changes within the middle ear spaces. Dysfunction of the Eustachian tube usually leads to chronic inflammatory changes of the middle ear. The aim of the present feasibility study was to investigate an alternative, minimally ...
Tekin Murat - - 2008
This study aimed to evaluate the effects of different inflating gases used for ProSeal LMA (PLMA) cuff inflation on cuff pressure, oropharyngeal structure, and the incidence of sore throat. Eighty patients (American Society of Anesthesiologists; ASA I-II) were randomly divided into two groups. PLMA cuff inflation was achieved with appropriate ...
Ikarashi Fumio - - 2008
CONCLUSION: It is thought that gas exchange via the mucosa occurred in relation to the partial pressure gradient, and it was impaired mainly by inflammatory changes in the mastoid mucosa. It was verified that gas exchange via the mucosa is less likely to be impaired than gas exchange via the ...
Hameed Akmal A - - 2008
High-compliance endotracheal tube cuffs are used to prevent gas leak and also pulmonary aspiration in mechanically ventilated patients. However, the use of the usual cuff inflation volumes may cause tracheal damage and lead to tracheoesophageal fistula.Tracheostomy tube cuffs seal against the tracheal wall and prevent leakage of air around the ...
Chrisostomidis C - - 2008
Keloids are a frequent finding after physical trauma. Keloids of the pinna (helix and antihelix) as a complication of ear-piercing are the most difficult cases. Clinicians have tended to avoid the surgical approach, preferring local conservative treatment with corticosteroids or other treatments. We report use of intrakeloid resection and a ...
McDonagh Marian S - - 2007
A systematic review of the evidence was conducted on the benefits and adverse effects of hyperbaric oxygen treatment (HBOT) for cerebral palsy (CP). Studies of any HBOT regimen in patients with CP were included except for case reports and case series. Electronic databases (e.g. MEDLINE, EMBASE), professional society databases, and ...
Mariak Z - - 2007
Our two-year experience with a new atraumatic tip for the neurosurgical suction tube is described. During microneurosurgical procedures the tip reduces injury to fragile vital brain structures and protects them from being aspirated into the suction tube. The perforated membrane of the appended suction tip does not impede evacuation of ...
Cole Lynette K - - 2007
The tympanic membrane is divided into the pars flaccida (PF) and pars tensa. Otoscopic differences in the appearance of the PF in the dog (flat vs. bulging) have been reported anecdotally. The purpose of this study was to histologically examine the canine PF to determine if differences exist between a ...
Dai Chenkai - - 2008
In our previous studies, the effects of effusion and pressure on sound transmission were investigated separately. The aim of this study is to investigate the combined effect of fluid and pressure on middle ear function. An otitis media with effusion model was created by injecting saline solution and air pressure ...
Mills Robert - - 2007
PURPOSE: To investigate the motion of prostheses used to reconstruct ears with an absent stapes arch. STUDY DESIGN: We have studied the motion of conventional total ossicular replacement prostheses (TORPs) and a novel incus-stapes replica prosthesis (ISRP), which connects the malleus head to the footplate, during changes in middle ear ...
Roy-Choudhury Shuvro H - - 2007
OBJECTIVE: The objective of our study was to determine the relative sensitivity and the lowest threshold of bleeding detectable with digital subtraction angiography (DSA) and with MDCT using an in vitro physiologic system. MATERIALS AND METHODS: A closed pulsatile cardiopulmonary bypass circuit was connected to tubes traversing a water bath ...
Amini A - - 2007
A disposable laryngeal tube (LT-D) with dimensions identical to, but physical properties different from (stiffer tube/thicker cuff), the reusable laryngeal tube (LT-R) has recently become available. We performed a randomised, single blind trial among 100 anaesthetised and paralysed patients to compare these devices in terms of ease of insertion, airway ...
Navarro Lais Helena Camacho - - 2007
CONTEXT AND OBJECTIVE: High intracuff pressure in endotracheal tubes (ETs) may cause tracheal lesions. The aim of this study was to evaluate the effectiveness and safety of endotracheal tube cuffs filled with air or with alkalinized lidocaine. DESIGN AND SETTING: This was a prospective clinical study at the Department of ...
Bazilevsky Alexander V - - 2008
The aim of this work is to demonstrate controlled flow through macroscopically long (approximately 1 cm) carbon tubes (0.5-1.8 microm in radius). A model, high-throughput, pressure-driven fluidic setup, which features a large number of parallel carbon tubes forming a bundle, is fabricated and tested. The carbon tubes are synthesized and ...
Stolzmann Paul - - 2008
The purpose of this study was to quantify radiation dose parameters of dual-source CT coronary angiography. Eighty patients underwent contrast-enhanced, retrospectively ECG-gated dual-source CT coronary angiography with heart rate-adapted ECG pulsing using two algorithms: In 40 patients, the tube current was reduced to 20% (A(min1)) of the normal tube current ...
Stenfelt Stefan - - 2007
An acoustical model using simplified ear anatomy was designed to predict the ear-canal sound pressure occlusion effect in humans. These predictions were compared perceptually as well as with ear-canal sound pressure occlusion effect measurements using a foam earplug with shallow insertion, a foam earplug with deep insertion into the bony ...
Collins Sean - - 2007
BACKGROUND AND PURPOSE: The clinical application of chemolysis for struvite stones is limited because of the need for a nephrostomy tube and the potential risk of elevated intrarenal pressures, which may be associated with sepsis and metabolic derangements. We evaluated the utility of a high-flow low-pressure irrigation system, designed to ...
Fuchs J - - 2007
BACKGROUND: Insertion of a gastric tube (GT) in anaesthetized, paralyzed and intubated patients may be difficult. Tracheobronchial malposition of a GT may result in deleterious consequences. The purpose of this study was to determine the reliability of tracheal cuff pressure measurement to detect endobronchial malposition of GTs. We compared this ...
Uchimizu Hirotaka - - 2007
CONCLUSIONS: Inflammation of the middle ear mucosa leads to inhibition of transmucosal carbon dioxide (CO2) diffusion. Furthermore, CO2 diffusion is inhibited more severely in ears with a histologically higher grade of inflammation. OBJECTIVES: To investigate the effect of inflammatory changes in the middle ear mucosa on transmucosal gas exchange, and ...
Valk W L - - 2008
During and after an increase of inner ear pressure, induced by injection of artificial perilymph, the 2f1 - f2 and f2 - f1 distortion products (DPs) in cochlear microphonics (CM) and otoacoustic emissions (OAE) were recorded in the guinea pig. An inner pressure increase of approximately 600 Pa gave only ...
Lin H J - - 2007
BACKGROUND: The cuff pressures may be different in oesophageal and tracheal intubations. We conducted a study to evaluate if cuff pressures of endotracheal tubes (ETTs) could provide information to distinguish tracheal or oesophageal intubations in a pig trachea-oesophagus model. METHODS: In each preparation of pig trachea-oesophagus model, the trachea and ...
Pirodda Antonio - - 2008
The possible genesis of some damage of the inner ear from a hemodynamic imbalance of functional origin, possibly linked to hypotension followed by an abnormal vasomotor regulatory activity, has been pointed out by our group over the years. As tinnitus, which is often referable to an inner ear origin, can ...
Smith Matthew J - - 2008
This study characterizes the cross-linking of electrospun elastin and the mechanical properties of suture-reinforced 1.5mm internal diameter electrospun tubes composed of blended polydioxanone (PDO) and soluble elastin. Several tube configurations were tested to assess the effects of reinforcement on tube mechanical properties. Between the electrospun layers of each double-layered prosthetic, ...
Gesquiere Michael J - - 2007
OBJECTIVE: It has been widely appreciated that ventilation-induced variations in systolic blood pressure during mechanical ventilation correlate with changes in intravascular volume. The present study assessed whether alterations in volume status likewise can be detected with noninvasive monitoring (ear plethysmograph) in non-intubated subjects (awake volunteers). METHODS: Eight healthy adults were ...
Windmill J F C - - 2007
Anatomically, the ears of moths are considered to be among the simplest ears found in animals. Microscanning laser vibrometry was used to examine the surface vibrations of the entire tympanal region of the ears of the noctuid moths Agrotis exclamationis, Noctua pronuba, Xestia c-nigrum and Xestia triangulum. During stimulation with ...
Winther Birgit - - 2007
CONCLUSION: Middle ear pressure was affected by respiratory illness and season; picornavirus (without illness) or pathogenic bacteria in the nasopharynx had no or minor effect. OBJECTIVE: To examine the effect of respiratory illness, season, and nasopharyngeal microbial flora on middle ear pressure. SUBJECTS AND METHODS: Thirteen children were followed longitudinally ...
Firat Yezdan - - 2007
OBJECTIVE: Dexmedetomidine is a preferred anesthetic agent in otological surgery because it provides controlled hypotension and good surgical field visibility. The aim of this study was to evaluate the influence of this novel agent on middle ear pressure. STUDY DESIGN AND SETTING: This prospective clinical trial was performed in 60 ...
Wang Xuelin - - 2007
A finite-element analysis for static behavior of middle ear under variation of the middle-ear pressure was conducted in a 3D model of human ear by combining the hyperelastic Mooney-Rivlin material model and geometry nonlinearity. An empirical formula was then developed to calculate material parameters of the middle-ear soft tissues as ...
Blanks Deidra A - - 2007
BACKGROUND: Otitis media with effusion (OME) is often associated with allergies. Immune modulatory oligonucleotides (IMO) mediate allergic inflammation and may therefore be efficacious in the treatment of airway inflammation. OBJECTIVE: To evaluate the role of an IMO via transtympanic mucosal application in prevention and treatment of ovalbumin-induced OME. DESIGN: Forty ...
Parwani Vivek - - 2007
OBJECTIVES: We sought to determine the ability of paramedics to inflate endotracheal tube cuffs within safe pressure limits as well as to estimate the pressure of previously inflated endotracheal tube cuffs by palpation of the pilot balloon. METHODS: Using a tracheal simulation model, we conducted a prospective, observational, cross-sectional simulation ...
Mooty Robert C - - 2007
Tracheo-esophageal fistula (TEF) formation is a rare complication of either endotracheal intubation or tracheostomy. This complication is generally thought to be iatrogenic and occurs in less than 1% of patients. High-volume, low-pressure cuffs have made TEFs an infrequent occurrence; however, it still poses as a potential life-threatening condition. Evaluation and ...
Dai Chenkai - - 2007
HYPOTHESIS: The aim of this study is to investigate the effect of middle ear fluid and pressure on tympanic membrane mobility by using laser Doppler interferometry and to compare these results with tympanometry. BACKGROUND: Tympanometry has been commonly used for evaluation of otitis media with effusion, a middle ear disease ...
Gadagkar Vikram - - 2007
We have used Raman spectroscopy to study the behavior of double-walled carbon nanotubes (DWNT) under hydrostatic pressure. We find that the rate of change of the tangential mode frequency with pressure is higher for the sample with traces of polymer compared to the pristine sample. We have performed classical molecular ...
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