Search Results
Results 451 - 500 of 942
< 5 6 7 8 9 10 11 12 13 14 15 >
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 ...
Hamel Donna S - - 2005
INTRODUCTION: Alterations in gas displacement in pediatric patients ventilated with the SensorMedics 3100A high-frequency oscillator are most commonly manipulated by adjusting the amplitude, frequency, and percent inspiratory time. The piston-position-and-displacement indicator is commonly centered and subsequently not adjusted. That practice may limit the clinician's ability to optimize carbon dioxide elimination. ...
Larøi F - - 2005
The objectives of the present study were to examine the degree of co-existence of hallucinations and delusions in the nonclinical population. In addition, we wished to investigate the role of metacognitions in hallucinations and delusions. Finally, we explored the relative roles of positive and negative metacognitive beliefs in proneness to ...
Lowne Duncan R - - 2005
Determination of body position on a mattress in a clinical setting is important for both diagnosis of sleep disorders and management and prevention of pressure sores. At present, patient body position is measured by visual inspection or by post analysis of either a video monitoring system or expensive, high-resolution arrays ...
Rupp-Montpetit Kimberly - - 2005
Decreased visual acuity and loss of visual ability are devastating anesthetic and surgical complications. The incidence is greater in patients with preexisting hypertension, diabetes, sickle cell anemia, renal failure, gastrointestinal ulcer, narrow-angle glaucoma, vascular occlusive disease, cardiac disease, arteriosclerosis, polycythemia vera, and collagen vascular disorders. Precipitating factors for ischemic optic ...
Meredith Carolyn - - 2005
Police officers commonly encounter violent individuals in their line of duty, with the use of physical restraint sometimes being necessary. A major criticism of previous studies of the effect of restraint on cardiac and pulmonary function has been that they have only recruited young healthy adults. This study aims to ...
Hwang Jung Hye - - 2004
BACKGROUND: Partial liquid ventilation (PLV) and prone positioning can improve the arterial oxygenation (PaO2) in acute lung injury (ALI). We evaluated the effect of prolonged prone positioning during partial liquid ventilation (PLV) in a canine model of acute lung injury. METHODS: Six mongrel dogs (weighing 17.4 +/- 0.7 kg each) ...
Martin-Du Pan Rémy C - - 2004
Postural medicine studies the effects of gravity on human body functions and the ability to influence various diseases by changing the body's position. Orthostasis requires numerous cardiovascular and neurohumoral adaptations to prevent hypotension and a resulting decrease in cerebral perfusion. Sitting upright or in a semi-sitting position reduces venous return ...
Jones Alice Y M - - 2004
OBJECTIVE: The study's objective was to examine the effect of body position on oxygen consumption (Vo(2)) and hemodynamics. Although gravity-dependent hemodynamic and pulmonary consequences are well documented, less is known about the effect of body positions on VO(2) and hemodynamics, which is of importance in critical care. DESIGN: This was ...
Pury Cynthia L S - - 2004
OBJECTIVE: Increased blood pressure is associated with decreased reports of aversiveness for both physical pain and psychosocial stressors. Based on these findings, higher blood pressure could be associated with altered emotional responses to a broader range of stimuli. There are at least 3 ways this could happen: a) less dire ...
Morris Rhys J - - 2004
External compression of limbs to below-diastolic pressure (venous compression) has been shown to produce a short-lived hyperaemia in supply arteries. Intermittent pneumatic compression is currently under investigation therefore as a treatment for peripheral arterial disease. The optimal timing of the compression will depend on the duration of hyperaemia produced by ...
Polga David J - - 2004
STUDY DESIGN: In vivo pressures were measured in radiologically healthy middle and lower thoracic discs in 6 adult volunteers. OBJECTIVES: To quantify and compare intradiscal pressures from the middle and lower thoracic spine during various body positions and maneuvers, and to investigate the potential variation of these pressures with orientation ...
Okutsu Ichiro - - 2004
Carpal tunnel syndrome is a compression neuropathy wherein the median nerve is compressed inside of the carpal canal. Its diagnosis is made clinically, electrophysiologically, and sometimes by carpal canal pressure measurement. The objective of surgical management of this condition is the decompression of the median nerve. We usually measure carpal ...
Perlitz Volker - - 2004
Selected examples from experiments in humans and dogs with time series of reticular neurons, respiration, arterial blood pressure and cutaneous forehead blood content fluctuations were analysed using multiscaled time-frequency distribution, post-event-scan and pointwise transinformation. We found in both experiments a "0.15-Hz rhythm" exhibiting periods of spindle waves (increasing and decreasing ...
Wong Lu Fee - - 2004
STUDY OBJECTIVE: Variable success rates of the Valsalva maneuver in treatment of paroxysmal supraventricular tachycardia may be due to variations in performance technique. This study aimed to compare the magnitude of the vagal reflexes initiated by 5 variations of the Valsalva maneuver technique (supine, supine with epigastric pressure, supine with ...
Sarma Jayantha Kumar - - 2004
This study highlights the effect of Rudraksha (Elaeocarpus ganitrus Roxb) in experimentally induced acute hypertension by adrenaline and nicotine. Study was done in 6 anaesthetised cats having similar body weight and age. 90 % Ethanol extracts of Elaeocarpus ganitrus Roxb was given intravenously to cats. Blood pressure was measured by ...
Rohdin M - - 2004
When normal subjects are exposed to hypergravity [5 times normal gravity (5 G)] there is an impaired arterial oxygenation that is less severe in the prone compared with supine posture. We hypothesized that under these conditions the heterogeneities of ventilation and/or perfusion distributions would be less prominent when subjects were ...
Daffertshofer Andreas - - 2004
In search of the formative principles underwriting locomotor-respiratory coupling, we reanalyzed and modeled the data collected by Siegmund and coworkers (1999) on the synchronization of respiration during rowing. Apart from the frequency doubling in respiration reported earlier, detailed time-resolved spectral analyses revealed decreasing stability of entrainment close to abrupt changes ...
McGuinness Mark - - 2004
Arnold tongues are phase-locking regions in parameter space, originally studied in circle-map models of cardiac arrhythmias. They show where a periodic system responds by synchronizing to an external stimulus. Clinical studies of resting or anesthetized patients exhibit synchronization between heart-beats and respiration. Here we show that these results are successfully ...
Alexianu Daniela - - 2004
A 34-mo-old boy with neurofibromatosis, scoliosis, and pectus excavatum developed severe hypotension when positioned prone. A magnetic resonance image study revealed neurofibromas encircling the great vessels. During the next anesthetic the patient was placed in the prone position on transverse bolsters and hypotension ensued again. A transesophageal echocardiogram (TEE) revealed ...
Ketner M W - - 2004
The Fontan circulation or one of its many modifications is a common surgical procedure implemented in children with congenital heart defects to improve pulmonary circulation. Two modifications are the atriopulmonary connection (AP) and the modified total cavopulmonary connection (TCPC). Successful AP and TCPC operations performed in lambs show respiration has ...
Brack Thomas - - 2003
Cheyne-Stokes Respiration (CSR) is a breathing pattern characterised by rhythmic oscillation of tidal volume with regularly recurring periods of hyperpnoea, hypopnoea and apnoea. CSR is no longer solely regarded as a symptom of severe congestive heart failure (CHF), but has been recognised as an independent risk factor for worsening heart ...
Migneco Alessio - - 2003
BACKGROUND: Arterial hypertension is a risk factor for atherosclerosis of whose pathogenesis is unknown. Growing evidence underscores the causative role of endothelial dysfunction. A possible association between Helicobacter pylori infection and cardiovascular and autoimmune disorders has been found. The release of cytotoxic substances either of bacterial origin or produced by ...
Kozlov Andrey P - - 2003
Newborn rats, 3 hr after birth and before any experience in suckling, were exposed for 10 min to a surrogate nipple providing milk. One hour later, they were exposed to an empty nipple for another 10-min period. The basic characteristics of oral behavior (oral compression activity, OCA) were assessed by ...
< 5 6 7 8 9 10 11 12 13 14 15 >