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Results 201 - 250 of 1631
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Zehlicke T - - 2011
Middle ear pressure depends widely on the function of the eustachian tube. Tube dysfunction is often a trigger for middle ear diseases like chronic otitis media but also for barotrauma. Patients with impaired tubal function should not be exposed to situations with extreme pressure changes. Until today, there is no ...
Reichenbach Tobias - - 2010
The inner ear achieves a wide dynamic range of responsiveness by mechanically amplifying weak sounds. The enormous mechanical gain reported for the mammalian cochlea, which exceeds a factor of 4000, poses a challenge for theory. Here we show how such a large gain can result from an interaction between amplification ...
Amatoury Jason - - 2010
We studied the impact of wall strain and surrounding pressure on the onset of airflow limitation in a thin-walled "floppy" tube model. A vacuum source-generated steady-state (baseline) airflow (0-350 ml/s) through a thin-walled latex tube (length 80 mm, wall thickness 0.23 mm) enclosed within a rigid, sealed, air-filled, cylindrical chamber ...
Cherng Chen-Hwan - - 2010
Nasotracheal tube induced nasal ala pressure sores or necrosis during prolonged nasotracheal intubation have been reported, and it is a serious but preventable complication. Here we introduce a modified nasotracheal tube to prevent this complication. This modified nasotracheal tube is composed of two parts, an oral endotracheal tube and a ...
Kanoore Edul Vanina S - - 2010
To evaluate the impact of a recruitment manoeuvre (RM) on haemodynamics, gas exchange, and oxygen transport in patients with acute lung injury (ALI) an acute respiratory distress syndrome (ARDS) under mechanical ventilation. Prospective interventional study in the intensive care unit of a teaching hospital in Buenos Aires, Argentina. The study ...
Yuksel Sancak S Department of Otorhinolaryngology-Head and Neck Surgery, University of Texas Medical School at Houston, 6431 Fannin Street, MSB 5.036, Houston, TX 77030, USA. - - 2011
Past in vivo studies in humans showed that the tympanic membrane (TM) is permeable to physiological gases. Animal studies show that transTM CO(2) conductance is increased by TM pathology. The objective of the study was to determine if transTM CO(2) exchange in humans is affected by atrophic and sclerotic pathologies. ...
Shimizu Tsuyoshi - - 2010
External counterpulsation (ECP) is a beneficial and noninvasive treatment for coronary artery disease or heart failure; however, it still has a lot of limitations. We used a novel ECP system, Compact CP, the main feature of which is the double-lumen cuff that reduces the impact of cuff inflation and the ...
Liu Jianhui - - 2010
BACKGROUND: Postoperative respiratory complications related to endotracheal intubation usually present as cough, sore throat, hoarseness, and blood-streaked expectorant. In this study, we investigated the short-term (hours) impact of measuring and controlling endotracheal tube cuff (ETTc) pressure on postprocedural complications. METHODS: Five hundred nine patients from 4 tertiary care university hospitals ...
Christensen-Dalsgaard Jakob - - 2011
The eardrums of all terrestrial vertebrates (tetrapods) are connected through Eustachian tubes or interaural canals. In some of the animals, these connections create pressure-gradient directionality, an enhanced directionality by interaction of sound arriving at both sides of the eardrum and strongly dependent on interaural transmission attenuation. Even though the tympanic ...
Hart Diana Elizabeth - - 2011
Water condensate in the humidifier tubing can affect bi-level ventilation by narrowing tube diameter and increasing airflow resistance. We investigated room temperature and tubing type as ways to reduce condensate and its effect on bi-level triggering and pressure delivery. In this bench study, the aim was to test the hypothesis ...
Werner Clément M L - - 2010
Subacromial impingement is one of the underlying factors of rotator cuff pathologies and is linked to increased subacromial pressures. Because humans spend about one-third of their life sleeping, we hypothesized that distinct shoulder positions while sleeping may considerably influence nocturnal subacromial pressures. Consequently, atrophy and rupture can affect tendon healing ...
Jung Axel - - 2010
Recurrent laryngeal nerve palsy (RLNP) occurs as a complication during anterior cervical spine surgery. In 2005 the authors demonstrated the high incidence of asymptomatic RLNP in a right-sided approach. This follow-up prospective observational study was designed to test 2 options said to reduce the rate of RLNP: reduced endotracheal cuff ...
Garg Rakesh - - 2010
Anterior cervical discectomy and fusion is a commonly performed procedure for prolapse of cervical intervertebral disc. It involves retraction of soft tissue of neck for adequate exposure of anterior spinal canal. Increased cuff pressure with retractor application may affect the postoperative vocal cord function. Cuff pressures of tracheal tube were ...
Trivedi Lopa - - 2010
Endotracheal tube (ETT) should have intracuff pressure (ICP) in the range of 20 to 30 cm water (H(2)O). In this observational study, we studied the trend amongst anaesthesiologist in choosing the type of ETT and their ability to assess optimum ICP clinically. After institutional ethics committee approval, we observed 75 ...
Pessoa Kivânia C - - 2010
Morbidly obese patients develop more atelectasis during general anesthesia than non-obese ones, and these atelectasis persist for 24 hours after the end of the surgical procedure. This study evaluated the effect of noninvasive ventilation with two pressure levels (BiPAP) in the pulmonary function, incidence of immediate postoperative pulmonary complications and ...
Schuh Jason R - - 2010
Esophageal detector devices (EDDs) impose negative pressure on the trachea or esophagus to verify endotracheal tube (ETT) position. In cardiac arrest, the smooth muscle of the lower esophageal sphincter relaxes in a time-dependent and irreversible manner. If relaxation also occurs in the muscular posterior tracheal wall, it could predispose tracheal ...
Janossy K M - - 2010
We studied the effect of pilot balloon design on the ability of experienced anaesthetists to assess and inflate tracheal tube cuffs to safe pressures. A model trachea was designed, incorporating a degree of compliance and an air leak, to evaluate six different pilot balloons grafted onto identical tracheal tubes. Pilot ...
Jumah Masen Dirk - - 2010
Middle ear barotrauma is a condition frequently associated with flying. It is usually caused by Eustachian tube (ET) dysfunction. Pressure-regulating earplugs (PREP) should improve complaints due to pressure equalization problems. There were 21 patients with a history of pressure equalization problems while flying who were examined. ET function was measured ...
Gaihede Michael - - 2010
HYPOTHESIS: Middle ear pressure (MEP) is actively regulated by both the Eustachian tube and the mastoid air cell system. BACKGROUND: MEP is a highly significant factor involved in many clinical conditions related to otitis media. Basic knowledge on its overall regulation remains insufficient, but the Eustachian tube and mastoid gas ...
Gi Eri - - 2010
OBJECTIVE: Repeated blood pressure measurement with a sphygmomanometer often produces skin redness and subcutaneous bleeding in clinical settings. Recently, we have produced a new reusable skin-protective cuff with an additional sheet. METHODS: We evaluated skin damage and blood pressure measurement accuracy when using the new cuffs. We also evaluated upper ...
Burgos Miria Suzana - - 2010
During childhood and adolescence, physical inactivity, excess weight, and poor nutrition are risk factors for chronic diseases, especially obesity, hypertension, and diabetes mellitus. Early intervention can prevent the development of these complications. To determine the presence of cardiovascular risk (obesity and hypertension) in schoolchildren and its potential interactions with cardio-respiratory ...
Lorente Leonardo - - 2010
In the past 2 years, American, Canadian, and European scientific societies have published their new evidence-based guidelines for ventilator-associated pneumonia (VAP) prevention. However, these guidelines did not review some potentially useful strategies, such as the use of an endotracheal tube with an ultrathin cuff membrane, an endotracheal tube with a ...
Tollefsen William W - - 2010
OBJECTIVES: Prolonged endotracheal tube cuff pressures (ETTCPs) greater than 30 cm H2O can cause complications. With increasing utilization of cuffed endotracheal tubes (ETTs) in pediatric patients comes the risk of overinflation. We evaluated the incidence of elevated ETTCP in pediatric patients intubated with cuffed ETTs, transported by a critical-care transport ...
Makibara Renata Rumy - - 2010
The Eustachian tube has the function of equilibrating the environmental pressure with inner pressure, protecting the middle ear from abrupt pressure changes. To compare the Eustachian tube function in adults with and without history of otitis media and/or respiratory tract inflammation without tympanic membrane perforation. The Eustachian tube function was ...
Mujica-Lopez Karla I - - 2010
BACKGROUND: Endotracheal tube (ETT) intubation impairs mucus clearance, which can lead to respiratory compromise. We compared three ETTs that have intrinsic capacity to aspirate secretions pooling above the cuff. METHODS: We evaluated the ability of three ETTs with suction, Hi-Lo Evac, Teleflex ISIS, and Portex Blue Line SACETT, to aspirate ...
Chopra Michelle - - 2010
Tracheal mucosal blood flow is impaired when tracheal tube cuff pressure is above 30 cm of water, with the potential for tracheal mucosal necrosis. Previous studies have found excessive cuff pressures in simulated patients intubated by North American emergency physicians as well as patients intubated in the prehospital setting and ...
Hockings Lisen - - 2010
BACKGROUND: Optimal inflation of the laryngeal mask airway (LMA) cuff should allow ventilation with low leakage volumes and minimal airway morbidity. Manufacturer's recommendations vary, and clinical end-points have been shown to be associated with cuff hyperinflation and increased leak around the LMA. However, measurement of the intra-cuff pressure of the ...
Efrati Shai - - 2010
PURPOSE: To evaluate whether the degree of endotracheal tube (ETT) obstruction can be predicted by changes of ETT cuff pressure (P (c)) as a function of peak inspiratory pressure. METHODS: The study was conducted in three phases: phase I evaluated the correlation between peak tracheal pressure (P (tr)) and P ...
Bassi Marco - - 2010
STUDY OBJECTIVE: We evaluate changes in endotracheal tube intracuff pressures among intubated patients during aeromedical transport. We determine whether intracuff pressures exceed 30 cm H(2)O during aeromedical transport. METHODS: During a 12-month period, a helicopter-based rescue team prospectively recorded intracuff pressures of mechanically ventilated patients before takeoff and as soon ...
Dave Mital H - - 2010
PURPOSE: Longitudinal folds in tracheal tube (TT) cuffs cause leakage of pooled secretions past the tube cuff, and the most common in vitro method to test the efficacy of a new tube is a benchtop model using an artificial rigid trachea. This study compared the potential of a static and ...
Gallasch Eugen - - 2010
For quantitative somatosensory testing in the clinical environment a microprocessor controlled MR-compatible stimulation device was developed. A main feature of this device is the use of an inflatable cuff allowing the application of defined test pressures (0-1000 mbar) to the skin surface. The cuff is pressurized by a piezoelectric proportional ...
Abe Yukiko - - 2010
Background: Oxygen masks with reservoir bags (OMR) are widely used for oxygen therapy in patients with severe respiratory failure. The purpose of the present study was to determine whether OMRs are effectively used in clinical practice. Methods and Results: In the first phase of the study on the patients with ...
Hofstetter Christian - - 2010
BACKGROUND: Initiated by a clinical case of critical endotracheal tube (ETT) obstruction, we aimed to determine factors that potentially contribute to the development of endotracheal tube obstruction by its inflated cuff. Prehospital climate and storage conditions were simulated. METHODS: Five different disposable ETTs (6.0, 7.0, and 8.0 mm inner diameter) ...
Baum Jonathan D - - 2010
Background. Tympanic membrane perforation may occur when ear pressures are excessive, including valsalva maneuver associated with active labor and vaginal delivery. A pressure differential across the eardrum of about 5 psi can cause rupture; the increased intraabdominal pressure spikes repeatedly manifested by "pushing" during second-stage labor easily approach (and may ...
Hiebl B - - 2010
This study shows first in vitro tests of a nitinol based vein cuff developed for external valvuloplasty. In contrary to currently existing vein cuffs the tested model enables minimal invasive implantation and also maintains its round pre-shaped profile at body temperature (37 degrees C). The examination of the cuff surface ...
Cunsolo E - - 2010
The Eustachian tube (ET) is divided in 3 portions: a bony portion, a cartilaginous portion, and a junctional portion. From an anatomical-functional point of view, the bony portion of ET is the region of ventilation and clearance of secretions, and is lined by pseudostratified, ciliated, columnar epithelium, with an anti-gravitational ...
Routsi Christina - - 2010
Both experimental and clinical data give convincing evidence to acute cardiac dysfunction as the origin or a cofactor of weaning failure in patients with chronic obstructive pulmonary disease. Therefore, treatment targeting the cardiovascular system might help the heart to tolerate more effectively the critical period of weaning. This study aims ...
Fanelli Vito - - 2010
The 'open lung' approach has been proposed as a reasonable ventilation strategy to mitigate ventilator-induced lung injury (VILI) and possibly reduce acute respiratory distress syndrome (ARDS)-related mortality. However, several randomized clinical trials have failed to show any significant clinical benefit of a ventilation strategy applying higher positive end-expiratory pressure (PEEP) ...
He David Da DD Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. - - 2010
Obtaining vital signs non-invasively and in a wearable manner is essential for personal health monitoring. We propose the site behind the ear as a location for an integrated wearable vital signs monitor. This location is ideal for both physiological and mechanical reasons. Physiologically, the reflectance photoplethysmograph (PPG) signal behind the ...
Smith Gavin - - 2009
The Valsalva manoeuvre (VM) continues to be first-line management for haemodynamically stable supraventricular tachycardia in the acute setting. 40 mmHg of intrathoracic pressure is seen as an essential component of the VM. Anecdotally, blowing into a 10 mL syringe to move the plunger is one method of pressure generation; however, ...
Lewis James D - - 2009
Sound pressure level in-situ measurements are sensitive to standing-wave pressure minima and have the potential to result in over-amplification with risk to residual hearing in hearing-aid fittings. Forward pressure level (FPL) quantifies the pressure traveling toward the tympanic membrane and may be a potential solution as it is insensitive to ...
Ravicz Michael E ME Eaton-Peabody Laboratory, Department of Otolaryngology, Massachusetts Eye and Ear Infirmary, Boston, MA 02114, USA. - - 2010
An important step to describe the effects of inner-ear impedance and pathologies on middle- and inner-ear mechanics is to quantify middle- and inner-ear function in the normal ear. We present middle-ear pressure gain G(MEP) and trans-cochlear-partition differential sound pressure DeltaP(CP) in chinchilla from 100 Hz to 30 kHz derived from ...
Homma Kenji K Adaptive Technologies, Inc, 2020 Kraft Dr, Suite 3040, Blacksburg, VA 24060, USA. - - 2010
In extremely loud noise environments, it is important to not only protect one's hearing against noise transmitted through the air-conduction (AC) pathway, but also through the bone-conduction (BC) pathways. Much of the energy transmitted through the BC pathways is concentrated in the mid-frequency range around 1.5-2 kHz, which is likely ...
Pau Hans Wilhelm - - 2009
CONCLUSION: By means of a direct, though non-invasive experiment on healthy humans we could demonstrate that middle ear (ME) pressure decreases when the eustachian tube (ET) does not open. Thus with a very simple method the basic theory of continuous gas loss from the ME into the circulation and the ...
Col?ou Chlo? Marion - - 2009
This article discusses a microfluidic oscillating tube densitometer with an internal volume of approximately 20 microl. Accuracy better than +/-0.5% in density is demonstrated over a range of temperatures (50 degrees C-150 degrees C) and pressures (150-15,000 psi) by prior calibration with air and water. The flexibility of the tubing ...
Hoffman Robert J - - 2009
In an excellent investigation of endotracheal tube cuff pressure assessment, "Endotracheal Tube Cuff Pressures in Patients Intubated Prior to Transport," Chapman et al measured endotracheal tube cuff pressure in patients who arrive at their emergency department after being intubated in the field. This, the first published American study of this ...
Pau Hans Wilhelm - - 2009
Conclusions: Tympanometry in ears with retracted or partially atelectatic tympanic membranes does not reflect the true middle ear (ME) pressure. The position of the tympanogram peak depends on the size of a retraction pocket and the remaining ME gas volume. Thus tympanometry in such cases cannot be used for measurements ...
Wujtewicz Magdalena A - - 2009
Excessive tracheal tube cuff pressure can cause ischemia of the tracheal mucosa, and possible serious complications, such as tracheal stenosis, formation of tracheo-oesophageal fistula or even life-threatening haemorrhage. Inadequate cuff pressure increases the risk of aspiration of gastric contents. The cuff pressures were analysed on the basis of the anaesthesiologists' ...
Pelikan Zdenek - - 2009
PURPOSE: To investigate the possible role of nasal allergy on hearing levels in chronic otitis media with effusion (OME). METHOD: In 87 adults who had chronic OME, 185 nasal challenges with allergen were performed using rhinomanometry combined with tympanometry and pure-tone audiometry (PTA). RESULTS: Of the 87 patients, 71 developed ...
Chapman Jacob - - 2009
INTRODUCTION: Prolonged endotracheal tube cuff pressures (ETTCPs) greater than 30 cm H(2)O cause complications ranging from sore throat to rare cases of tracheoesophageal fistula. In a series of patients, we sought to determine the proportion of patients with overinflated cuffs and to determine whether overinflation was associated with demographics, diagnostic ...
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