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Results 451 - 500 of 966
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Thekkinkattil Dinesh K - - 2007
PURPOSE: Anorectal manometry is commonly used to investigate fecal incontinence. Traditional practice dictates that measurements are performed with the patient in the left-lateral position however, episodes of fecal incontinence usually occur in the erect position. The influence of erect posture on anorectal manometry has not been studied. METHODS: We examined ...
Krauza M L - - 2007
The purpose of this study was to examine the possibility that body position influences inspiratory airflow of submerged subjects. Our previous studies have suggested that for a given (negative) inspired gas pressure, exercising divers experience more dyspnea in the prone than in the upright position. METHODS: Six subjects performed maximal ...
Tsunoda Akira - - 2007
The dual switch valve (DSV), which switches between two parallel valve chambers depending on the patient posture, was evaluated in 101 consecutive adult patients with hydrocephalus who required shunt surgery. The opening pressure was 5 or 10 cmH(2)O for the supine position and 30 or 40 cmH(2)O for the upright ...
Leek Bryan T - - 2007
BACKGROUND: Acute compartment syndrome has been an underreported complication during spine surgery with the patient positioned on the so-called 90/90 kneeling frame (with 90 degrees of both hip and knee flexion), presumably because of elevated intramuscular pressures in the dependent leg compartments. The purpose of the present study was to ...
Oda T - - 2007
We have studied the ζ-phase of solid oxygen using the generalized gradient approximation in the density functional approach. Calculations of total energies and pressures have been carried out for the prototype of diatomic ζ-phase and other hypothetical monoatomic crystal structures. The diatomic phase was found to be stable over a ...
Brazhkin V V - - 2007
We present the in situ high-pressure-high-temperature x-ray diffraction study of the liquid AlCl(3) and ZnCl(2) halogenides having a quasi-molecular network structure in liquid state at normal pressure. These liquids are intermediate between pure covalent and ionic melts. Structural study of these liquid halogenides is indicative of a rapid and strong ...
Green N D C - - 2007
Forearm pain occurring during high +Gz exposure has been linked with vascular distension from elevated transmural pressure of hydrostatic origin and is exacerbated by positive pressure breathing (PBG). We postulated that at high vascular transmural pressure vascular autoregulation might be overcome and be associated with worsened pain. Six volunteers were ...
McBeth Paul B - - 2007
BACKGROUND: Intra-abdominal hypertension affects multiple organ systems. Current measurement standard requires supine positioning, which jeopardizes patient safety by increasing the risk for ventilator-associated pneumonia. This study evaluated the relationship between intra-abdominal pressure (IAP) and head-of-bed (HOB) positioning in critically ill intubated patients. METHODS: IAP measurements were performed using intravesical catheters ...
Soga Junko - - 2007
BACKGROUND: Measurement of flow-mediated vasodilation (FMD) is used to assess endothelial function in humans and according to the guidelines, subjects must remain supine during the study. However, measurement of FMD while seated would be more comfortable and convenient for patients, so the purpose of this study was to determine the ...
Wang Wei - - 2007
Poststenting restenosis is a significant clinical problem that involves vascular smooth muscle cell (VSMC) proliferation. We primarily investigated the effect of c-myc antisense oligodeoxynucleotides (ASODNs) combined with 188Re radiation therapy on VSMC proliferation in rabbit common iliac arteries injured by the porous balloon catheter to explore the therapeutic potential of ...
Bisceglia M - - 2007
AIM: Nasal continuous positive airway pressure and nasal intermittent positive pressure ventilation have both been proposed as a form of gentle respiratory support for neonatal respiratory distress syndrome. We have compared these two respiratory support methods in the management of early stages of mild-moderate, neonatal respiratory distress syndrome. METHODS: A ...
Huang Georgeanna J - - 2007
Abdominoplasty is associated with a 1.1 percent risk of deep venous thrombosis. This has been attributed to rectus plication causing intraabdominal hypertension, known to effect decreased venous return, venous stasis, and thus thrombosis. The authors conducted a pilot study to determine which components of the abdominoplasty procedure (i.e., general anesthesia, ...
Tsuiki S - - 2007
Neck extension because of contraction of cervical extensor muscles often brings about a lower-positioned tongue secondary to jaw opening in patients with congenital myopathy (CM). We hypothesized that neck extension in control subjects would reproduce the lower position of the tongue similar to that found in a CM patient. A ...
Schellongowski Peter - - 2007
OBJECTIVE: To establish whether prolonged lateral steep position during continuous rotation therapy leads to improvement on pulmonary gas exchange, respiratory mechanics and hemodynamics. DESIGN: Prospective observational study. SETTING: Intensive care unit of a university hospital. PATIENTS: Twelve consecutive patients suffering from acute lung injury or adult respiratory distress syndrome undergoing ...
Kotani K - - 2007
OBJECTIVES: The objective of our study is to investigate extrinsic influences on heart rate variability using respiratory-phase domain analysis. Swallowing, coughing and vocalization (reading aloud and conversation) are adopted as extrinsic influences. METHODS: In this study, an instantaneous R-R interval (RRI) is sampled at each pi/10 rad of the respiratory ...
Jaccard Yves - - 2007
Recently silver fiber-containing compression stockings for the use in patients with chronic venous insufficiency (CVI) were introduced to the market. In order to gain some first insight into the effects of these new fabrics on the cutaneous microcirculation, a double-blind, randomized cross-over trial was performed in 10 healthy volunteers. A ...
E┼čer Ismet - - 2007
AIM: The aim of the present study was to test the effects of different body on BP readings in a Turkish healthy young adults. BACKGROUND: It is known that many factors influence an individual's blood pressure measurement. However, guideliness for accurately measuring blood pressure inconsistently specify that patient's position and ...
Weiss Elisabeth E Department of Radiation Oncology, Virginia Commonwealth University, Richmond, VA 23298, USA. - - 2007
To investigate temporospatial variations of tumor and normal tissue during respiration in lung cancer patients. In 14 patients, gross tumor volume (GTV) and normal tissue structures were manually contoured on four-dimensional computed tomography (4D-CT) scans. Structures were evaluated for volume changes, centroid (center of mass) motion, and phase dependence of ...
Kopácová Marcela - - 2007
It has been hypothesized that Helicobacter pylori (Hp) infection may contribute to reduced stature, risk of hypertension or obesity. The aim was to evaluate body indices in Hp positive and negative persons. A total of 2436 subjects (4-100 years old) were tested for Hp status by (13)C-urea breath test. Data ...
Chow T T - - 2006
The severe acute respiratory syndrome (SARS) crisis led to the construction of a negative pressure operating theatre at a hospital in Hong Kong. It is currently used for treatment of suspected or confirmed airborne infection cases, and was built in anticipation of a return of SARS, an outbreak of avian ...
Agashe Geeta S - - 2006
BACKGROUND: This study investigated whether a tensioning headband that applies up to 20 mmHg pressure over a forehead pulse oximetry sensor could improve arterial hemoglobin oxygen saturation reading accuracy in presence of venous pooling and pulsations at the forehead site. METHODS: Healthy volunteers were studied breathing room air in supine ...
Rao Satish S C - - 2006
BACKGROUND: Whether defecation is influenced by body position or stool characteristics is unclear. AIM: We investigated effects of body position, presence of stool-like sensation, and stool form on defecation patterns and manometric profiles. METHODS: Rectal and anal pressures were assessed in 25 healthy volunteers during attempted defecation either in the ...
Gertler Arieh - - 2006
Leptin is a pleotropic hormone that acts both centrally and peripherally. Whereas leptin exhibits positive effects on several physiological functions, such as regulation of energy metabolism, reproductive function and immune responses, negative actions, such as enhancement of undesired immune responses in autoimmune diseases, tumorigenesis, elevated blood pressure and cardiovascular pathologies, ...
Lisi Anthony J - - 2006
This paper presents the first reported measurements of lumbar intervertebral disc pressure in vivo during spinal manipulation. A pressure transducer was inserted into the nucleus pulposus of one normal-appearing lumbar disc in an asymptomatic adult volunteer. Pressures were recorded during several body positions and maneuvers, then during spinal manipulation, and ...
Termklinchan Vilaval - - 2006
OBJECTIVE: Classic dermographism refers to the ability of the skin to produce a linear wheal with a scratch pressure of 4,900 gm/cm2. The authors manufactured a dermographometer to have precise and consistent measurement and tested it on different body regions to find the best location. MATERIAL AND METHOD: Twenty two ...
Sandor M Kay - - 2006
PURPOSE: This pilot study examines the effects of walking a labyrinth. METHOD: A convenience sample of 25 community members participated in a four-group, repeated measures study to gather information about vital signs and affect before and after labyrinth walks. Because of the small sample size, results were inspected for effect ...
Almarza Alejandro J - - 2006
The effects of mechanical stimuli on TMJ disc cells have yet to be investigated. This study examined for the first time the effect of constant and intermittent hydrostatic pressure (HP) on TMJ disc cells. Guided by studies on articular chondrocytes, the chosen amplitude was 10 MPa, the frequency was 1 ...
Carragee Eugene J - - 2006
STUDY DESIGN: Retrospective data review of positive disc injections at low pressures among subjects without chronic low back pain (LBP) illness compared to patients with chronic LBP undergoing Discography. OBJECTIVE: To test the hypothesis that false-positive injections during Discography can effectively be eliminated by defining the positive injection criteria to ...
Altshuler Douglas L - - 2006
Many birds fly at high altitude, either during long-distance flights or by virtue of residence in high-elevation habitats. Among the many environmental features that vary systematically with altitude, five have significant consequences for avian flight performance: ambient wind speeds, air temperature, humidity, oxygen availability, and air density. During migratory flights, ...
Husmann Marc J - - 2006
BACKGROUND: Direct assessment of the effect of postural changes on interstitial fluid pressure (IFP) in the human skin under physiological conditions is important for the understanding of mechanisms involved in diseases resulting in lower limb edema. Previous techniques to measure IFP had limitations of being invasive, and acute measurements were ...
Lane S - - 2005
We investigated whether positioning patients undergoing general anaesthesia for cholecystectomy in a 20 degrees head-up position, as opposed to supine, improved the efficacy of 3 min of standard pre-oxygenation via a circle breathing system. Following pre-oxygenation, patients received a standard induction of anaesthesia and the apnoea time (from administration of ...
Wittek Thomas - - 2005
OBJECTIVE: To determine changes in abomasal position and dimensions during the last 3 months of gestation and first 3 months of lactation via transabdominal ultrasonography and determine whether surgical correction of left-displaced abomasum (LDA) by right flank omentopexy alters abomasal position within the abdomen in Holstein-Friesian cows. DESIGN: Observational study. ...
Partsch Bernhard - - 2005
Compression therapy needs to narrow the veins of patients with venous disorders to achieve a hemodynamic effect. This study investigated the external pressure necessary to narrow and occlude leg veins in different body positions. In nine healthy volunteers and five patients with incompetent small saphenous veins, the diameter of the ...
Bérczi Viktor - - 2005
The objective was to compare in-situ diameter, capacity and distensibility changes as well as ellipticity of large human veins of different locations, reveal alterations with age, body position and increased intraluminal pressure. Ultrasonographic assessment of mediolateral and anteroposterior diameters was performed of femoral, axillary and inner jugular veins, in erect ...
Manna Essam M - - 2005
OBJECTIVE: To study the effect of prone position on respiratory mechanics during spine surgery. DESIGN: Prospective study. SETTING: Elective spine surgery at a university hospital. PATIENTS: 12 ASA physical I & II with no coexisting cardiorespiratory disease undergoing cervical or lumbar laminectomy under general anesthesia in prone position. MEASUREMENTS: Ten ...
Kaeser P - - 2005
AIM: To compare subfoveal choroidal blood flow (ChBF) in sitting and supine positions in normal volunteers. METHODS: ChBF was measured with laser Doppler flowmetry in 22 healthy volunteers of mean (SD) age 24 (5) years. Six independent measurements of ChBF were obtained in one randomly selected eye of each subject ...
Rigamonti Andrea - - 2005
STUDY DESIGN: Prospective randomized study. OBJECTIVES: To compare two support systems for positioning patients during microdiscectomy (i.e., prone on a modified Relton-Hall spine support vs. knee-chest position on an Andrews-type table) regarding their effects on intra-abdominal pressure and surgical bleeding. SUMMARY OF BACKGROUND DATA: Intra-abdominal pressure is an indicator of ...
Munarriz Ricardo - - 2005
PURPOSE: To investigate the differential impact of straddles (A(ns) and B(ns)) and noseless two-cheek seats (A(ntcs) and B(ntcs)) on penile hemodynamics and perineal compressive forces in subjects who cycle in a stationary bicycle. MATERIALS AND METHODS: Subjects underwent cavernosal artery peak systolic velocity (CAPSV) measurements after intracavernosal injection of vasoactive ...
Rosen Michael - - 2005
In this experimental study, small intestinal submucosa was implanted as an atrial prosthesis in calves. Echocardiography and histology showed this to be an impermeable prosthesis that develops a neointimal nonthrombogenic surface making it safe for repair of defects in a low-pressure system. Further study with small intestinal submucosa in an ...
Lorenzi-Filho Geraldo - - 2005
Cheyne-Stokes respiration is a form of periodic breathing in which central apneas and hypopneas alternate with periods of hyperventilation, producing a waxing and waning pattern of tidal volume. This review focuses on the causes and consequences of Cheyne-Stokes respiration in patients with congestive heart failure, in whom the prevalence is ...
Guillaume Anne I - - 2005
Fighter pilots are frequently exposed to high Gz acceleration which may induce in-flight loss of consciousness (G-LOC). One factor reducing tolerance to accelerations is a previous exposure to negative accelerations. This phenomenon, which happens during the first few seconds after the onset of the positive plateau, is called the push ...
Janssen Larry - - 2005
Users of particulate air-purifying respirators are typically told to change their filters when breathing resistance becomes uncomfortable. It has been proposed that a noticeable increase in breathing resistance (pressure drop) may increase airflow through respirator faceseal leaks. This logic has been extended to suggest that respirator user exposure to contaminants ...
Bressel Eadric - - 2005
Bicycle seat pressure is often examined by researchers exploring solutions for reducing seat injuries as it is thought a critical determinant; however, a reliable and valid methodology for this undertaking has not been reported. The current study was designed to address this shortcoming and to establish baseline interface pressure measurements ...
Manikappa S - - 2005
This prospective observational study compared the internal diameter and cross-sectional area of the right internal jugular vein pre-induction and post-initiation of positive pressure ventilation. Twenty patients undergoing coronary artery bypass surgery were studied. Measurements were taken with the operating table tipped to 30 degrees head down and the head turned ...
Kim Wuon-Shik - - 2005
The aim of this study was to investigate the nonlinear characteristics of heart rate variability (HRV) for three recumbent positions: the supine, left lateral and right lateral decubitus positions. Recently, using a linear analyses method (for time and frequency domains), the effect of the right lateral decubitus position on vagal ...
Putensen Christian - - 2005
Prone positioning may even in patients without abdominal hypertension result in an increased intra-abdominal pressure (IAP). Previous research could not demonstrate a marked increase in IAP associated with cardiovascular, renal, or hepato-splanchnic dysfunction when patients were proned in air-cushioned beds. Michelet and colleagues in this issue of Critical Care report ...
Derby Richard - - 2005
BACKGROUND: For lack of a criterion standard for lumbar discogenic pain, the validity of lumbar discography cannot be determined directly. The false-positive rate of discography, however, can be inferred from the prevalence of positive responses in asymptomatic volunteers. Responses in normal volunteers have been reported in only three studies, and ...
Mizuno Katsumi - - 2005
AIM: To determine whether sipping/lapping is a safe alternative to suckle bottle-feeding without any hydrostatic pressure, in terms of physiological stability and the relationship between swallowing and respiration. In addition, tongue movement was compared between sipping/lapping and suckling (bottle- and breastfeeding). METHODS: Eighteen infants (30-35?wk of gestation at birth) were ...
Laurens Stéphane - - 2005
The authors analyzed a neglected phenomenon: self-conversion. Rather than concentrating on the influence exerted by a confederate on a naive participant, the authors studied how the confederate is himself or herself influenced by the position that he or she defends at the request of the experimenter. This experiment is particularly ...
Inukai Yoko - - 2005
To estimate the effects of changes in body posture on sudomotor function, sweat rates on the forearm, chest and thigh, tympanic temperature (Tty), and skin temperatures were recorded in an upright sitting and a supine position under a hot environment of 40 degrees C Ta and 40% relative humidity for ...
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