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Results 701 - 750 of 965
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Wada Y - - 1994
Still now several hypotheses about the mechanisms of the caloric nystagmus have been in conclusive. In this study we confirmed the convection effect and the volume change effect of the endolymph in horizontal semicircular canal following the caloric stimulation using pigeons (Columba livia). Although the direction of the caloric nystagmus ...
Mahajan R P - - 1994
Ten healthy volunteers were placed in three different surgical prone positions (knee-chest, Eschmann frame and two supports, one each for the thorax and pelvis); the normal prone position without any supports was used as a control. Lung volumes using helium dilution and spirometry were calculated for each volunteer in each ...
Watanuki S - - 1994
To improve the design of the girdle which was a type of compression clothing, two kinds of experiments were carried out. At first, the degree of blood disturbance from wearing the girdles was evaluated by the cardiac output (Q). Q was significantly decreased with normal and small sized girdle was ...
Johnson B - - 1994
The efficacy of powered air-purifying respirators, surgical masks, dust/mist respirators, and high-efficiency respirators were tested with a biological aerosol under simulated breathing conditions. Protective ability ranged from 67 to 99.95%. The majority of penetration in negative-pressure respirators occurred at the face-mask interface rather than through the filter material.
Shimizu T - - 1994
Circulatory collapse and sudden death was defined retrospectively as one of the major critical problems among 23 respirator-dependent patients with amyotrophic lateral sclerosis (ALS). Six cases died from sudden cardiac arrest or anoxic encephalopathy following the circulatory collapse. In five among the six cases, sudden death or cardiac arrest occurred ...
Erickson B K - - 1994
The objective of the present study was to determine whether lung and diaphragm afferents contribute to the changes in respiratory muscle activity when end-expiratory lung volume (EELV) is changed in ponies. We studied the responses of the diaphragm and the transversus abdominis (TA) muscles to passive increases in EELV in ...
Watanuki S - - 1994
To investigate the effects of wearing compression stockings on cardiovascular responses, the heart rate (HR), cardiac output (Q) measured by CO2 rebreathing method, and oxygen intake were measured at rest in a supine position for 40 min and standing position for 120 min. Six female subjects wore the compression stockings ...
Houston J G - - 1994
BACKGROUND: Traditionally the radiological assessment of diaphragmatic movement has relied on fluoroscopy. Ultrasound scanning has recently been shown to be a sensitive and reproducible method of assessing hemidiaphragmatic movement in normal subjects. A study was undertaken to examine how movement of the diaphragm measured by ultrasound scanning relates to inspired ...
Pescatori E S - - 1994
During impotence evaluations a positive intracavernous injection test has been presumed to signify normal erectile hemodynamics. This premise was tested by obtaining hemodynamic data in 80 patients 17 to 65 years old with positive injection tests: patients achieved maximal circumference responses and equilibrium intracavernous pressures of 80 mmHg or more ...
Henderson J L - - 1994
This study compares three methods of pressure relief in seated spinal cord injured patients. One method consists of tipping the wheelchair back to 35 degrees, the second, tipping the wheelchair back to 65 degrees, and the third, leaning the subject forward with chest toward thighs. We evaluated dynamic pressure changes ...
Heijdra Y F - - 1994
BACKGROUND: Inspiratory muscle strength in patients with chronic obstructive pulmonary disease (COPD) can be affected by mechanical factors which influence the length of the diaphragm, and by non-mechanical factors. The aim of the present study was to evaluate firstly the effects of body position on respiratory pressures and, secondly, to ...
Staessen J A - - 1994
The possible association between low-level lead exposure and blood pressure and the causal nature of any such relationship continue to be debated. A recent meta-analysis of the human model data showed that on average a doubling of blood lead was associated with a rise in blood pressure averaging 1 mm ...
Komiyama T - - 1994
Changes in tissue oxygenation in the calf muscle were measured by near-infrared spectroscopy (NIRS) in 62 patients who complained of intermittent claudication in the calf during a treadmill test. Three distinctive patterns of oxygenated and deoxygenated haemoglobin were observed. None of the type 0 cases were severe (i.e., unable to ...
Campbell D L - - 1994
An analytical model is presented that estimates the distribution of workplace protection factor (WPF) values for positive-pressure respirators. Input for the model is (1) the instantaneous facepiece pressure measured as a function of time and (2) the distribution of WPF values for a negative-pressure version of the respirator. As an ...
Kawamata M - - 1994
The pressures in the intercostal and interpleural spaces were measured in 20 patients using an 18 gauge epidural catheter to confirm accurate catheter positioning for continuous intercostal and interpleural local anaesthetic blockade. In the intercostal space the mean (SD) pressure was negative (-1.8 (0.3)) mmHg and positive (+2.1 (0.3)) mmHg ...
Forrest F C - - 1994
We used a technique of measuring Xenon133 washout (XeW) from the alveolar space to evaluate transfer of gas from the acinus (Mackenzie et al., J. Appl. Physiol. 68: 2013-2018, 1990) during 2 min of apnea, 2 min of tracheal insufflation with oxygen (TRIO) and 90 sec of intermittent positive pressure ...
Martin B J - - 1994
The coordination of breathing and swallowing was studied in 13 young healthy adult subjects during the administration of graduated volumes of water (3, 10, and 20 ml). Simultaneous submental electromyography, respiratory plethysmography, and fiber-optic endoscopy revealed a well-timed pattern between physiological respiratory events and related swallowing events. Expiration was the ...
Tagawa M - - 1994
The aim of these studies was to investigate the effect of body posture on circulatory and respiratory system function in unmediated cattle. The plasma cortisol concentration was also measured and served as an indication of the level of stress imposed by animal handling and positional manipulation. Six mature, healthy Holstein ...
Songcharoen P - - 1994
A paraspinal compartment pressure measurement was taken in 20 volunteers (a) to establish the normal compartment pressure in a series of body postures at rest and (b) to determine the difference in paraspinal compartment pressure during weight-lifting (40 pounds) exercise between straight back lifting and straight knee lifting. The measurement ...
Suzuki J - - 1994
We evaluated the extent to which the myogenic autoregulatory response was affected by sympathetic vasoconstriction in humans. The stimulus used to produce sympathetic vasoconstriction was the cold water immersion of a contralateral finger. The stimulus used to elicit myogenic response was gravitational potential energy change (GPEC), that is, arm position ...
Bhatla B - - 1994
Continuous ambulatory peritoneal dialysis (CAPD) may not be tolerated by patients with chronic obstructive pulmonary disease (COPD) because of increased abdominal pressure in the standing position after instillation of peritoneal fluid. We report, here, a patient with COPD who had marked distress while on CAPD but was more comfortable with ...
Knox D M - - 1994
A comparison of the effects of one-, one and a half-, and two-hour turning intervals on changes in the skin surface temperature, interface pressure, and color was conducted on 16 older, healthy adults. Both trochanters and the sacrum were the sites used for measurement. Findings indicated that the greatest increase ...
Celsing F - - 1994
This study evaluates the effect of stepwise lowering of the hemoglobin (Hb) concentration on maximal walking distance (MWD) and hemodynamics in patients with intermittent claudication. The results in a study group (n = 6) were compared with those of a control group (n = 6) whose members were not subjected ...
Hirasawa A - - 1993
Using two-stage coronary ligation-, digitalis- and epinephrine-induced canine ventricular arrhythmia models, we examined whether a new positive inotropic agent, NKH477, 6-(3-dimethylaminopropionyl)forskolin hydrochloride, a water-soluble derivative of forskolin, had deleterious effects on arrhythmias. NKH477 increased heart rate (HR) and decreased blood pressure (BP) in dogs with all the arrhythmia models. Unexpectedly, ...
Bell L B - - 1993
1. Intrapericardial procaine, used to produce cardiac nerve blockade in both conscious and anaesthetized animals, has been reported to also produce changes in respiration. This study systematically investigated the effects of two doses of intrapericardial procaine on respiration in the conscious rabbit. 2. Rabbits were pre-instrumented with a chronic diaphragm ...
Semenchuk E M - - 1993
Behavioral, cardiovascular, and self-report of cognitive and affective responses to 2 interpersonal challenges were examined among 20 men with a positive (FH+) and 20 with a negative (FH-) family history of hypertension. Heart rate (HR) and blood pressure (BP) were measured throughout the laboratory session; Ss were requested to self-report ...
Millard J A - - 1993
OBJECTIVES: To determine whether pneumoperitoneum and reverse Trendelenburg's position used during laparoscopy impede common femoral venous flow and whether calf-length intermittent sequential pneumatic compression (ISPC) overcomes this impedance. DESIGN: Using Doppler ultrasonography, peak systolic velocities in the common femoral vein were measured in patients undergoing laparoscopic cholecystectomy with peritoneal insufflation ...
Venkataraman S T - - 1993
OBJECTIVES: a) To study the dose response of the calcium-channel-mediated increases in pulmonary vascular resistance with different levels of positive end-expiratory pressure; b) to study the reversibility of the calcium-channel mediated increases in pulmonary vascular resistance after discontinuation of positive end-expiratory pressure; and c) to study the effect of cyclooxygenase ...
Doering L V - - 1993
Positioning of critically ill patients affects hemodynamic and cardiopulmonary outcomes. A review of clinical studies indicates that backrest elevations up to 60 degrees do not affect measurement of intracardiac pressures or cardiac output, but PaO2 may diminish in sitting positions following surgical procedures. In lateral positions, measurement of intracardiac pressures ...
Andrews P J - - 1993
We prospectively studied the incidence of concealed aortocaval compression in parturients at term during identification of the extradural space. Forty ASA I or II parturients, at term and in active labour, who requested extradural analgesia were randomly allocated to one of two groups. Parturients in the first group (n = ...
Wolfman D E - - 1993
It has been demonstrated that positive air pressure applied to the bulla of the Mongolian gerbil results in significant osteoclastic activation and bone resorption. In this study, continuous positive air pressure of 15 mm Hg was applied to the right bulla for 1 week. A significant increase in osteoclast number ...
Martin L V - - 1993
The management of crushed chest injuries in the 1950s was unsatisfactory. A survey of these injuries in south-east Scotland in 1955-60 showed a mortality of 76%. The introduction of intermittent positive pressure ventilation carried out in a special unit produced a dramatic improvement in outcome with mortality reduced to 16% ...
Suzuki T - - 1993
We investigated venous blood drainage from the prostate into the vertebral vein system by cineangiography in five mongrel dogs and measured intraabdominal pressure and venous blood pressure in the dog or human to study the role of intraabdominal pressure in the drainage. The averages of intraabdominal pressure and caudal vena ...
Melchior F M - - 1993
The cardiovascular system is the limiting factor for human tolerance to positive Gz (head-to-foot) acceleration induced during maneuvers of fighter aircrafts. Safe handling of modern fighter aircrafts with higher acceleration capabilities require the use of countermeasures such as a G-suit or breathing at a positive pressure. A better understanding of ...
Klimmek R - - 1993
The heavy metal antidotes sodium-2,3-dimercaptopropane-1-sulfonate (DMPS) and meso-2,3-dimercaptosuccinic acid (DMSA) were investigated in anaesthetized dogs for their effects on a variety of physiological variables and parameters. In addition, the influence of both dithiols on oxygen consumption and ferrihaemoglobin production was studied in blood and red blood cells in vitro. DMPS ...
Chadwick I S - - 1993
An epidural catheter may be inserted with the patient either in the flexed left lateral or the sitting position. We have studied, non-invasively, the haemodynamic changes associated with these positions, using the thoracic bio-impedance method (BOMED NCCOM3 Monitor). Maternal arterial pressure and fetal heart rate were monitored simultaneously. Twenty healthy ...
Cvetnic W G - - 1992
The use of continuous negative pressure was prospectively studied in 30 preterm and term hypoxemic (PaO2 < 45 mm Hg) neonates. Infants were randomly assigned to either positive end-expiratory pressure or continuous negative pressure if conventional positive pressure ventilation failed to improve oxygenation. Crossover to the alternative therapy occurred if ...
Ikeda N - - 1992
To investigate the course of respiration and circulation in death due to various types of asphyxia, dogs were asphyxiated by a method simulating typical hanging, by plastic-bag suffocation, by breathing pure nitrogen and low concentration of oxygen. Intrathoracic pressure, blood pressure in the femoral artery, electrocardiogram and electroencephalogram were registered ...
Hiraga Y - - 1992
Twenty non-obese patients, 13-29 years of age, operated on for scoliosis were examined for cardio-respiratory changes that occur during positioning on bolsters, and the effect on the cardio-respiratory system of raised intra-abdominal pressure was evaluated. Hemodynamic and respiratory responses were measured when the position was changed from supine to prone ...
Mordelet-Dambrine M - - 1992
We investigated the effects of tachykinins on the respiratory clearance of 99mTc-DTPA (RC-DTPA) in anesthetized and ventilated guinea pigs. We measured the change in RC-DTPA and in maximal pulmonary insufflation pressure (PIPmax) induced by substance P, neurokinin A, and capsaicin. Substance P, neurokinin A, and capsaicin increased both PIPmax and ...
Park C A - - 1992
Ipsilateral ischial tuberosity pressure of 12 subjects seated in wheelchairs was measured during reach to an activity positioned on both an upright and a flat plane. Ischial tuberosity pressure during cross-body, forward, and lateral reach was measured with a static pressure measurement device. Differences between flat-plane readings and upright-plane readings ...
Sideranko S - - 1992
A comparison of pressure reducing properties of alternating air, static air, and water mattress overlays was conducted with 57 patients in a surgical intensive care unit. Sacral and heel pressures in both recumbent and semi-Fowler's positions were tested for each surface using a repeated measures design. Mean pressures for the ...
Siegel I M - - 1992
Elevation of intracompartmental calf pressure in Duchenne Muscular Dystrophy can cause compartmental syndrome which accelerates mechanical muscle damage. Relief of increased pressure by fasciotomy inhibits this process. Intermittent pressure monitoring may prove of value in the routine orthopaedic management of patients with this disease. A historically controlled study to determine ...
Esses S I - - 1992
In an effort to determine the relationship between low-back pain and intraosseous hypertension, in vivo vertebral pressure measurements were performed on 19 patients. A cannulated screw was placed percutaneously into the middle of the vertebral body by a transpedicular route. Pressure measurements were recorded with the patient in various positions. ...
Fröhlich K - - 1992
The pressures from the tongue on the teeth were recorded simultaneously in four locations lingual to the upper and lower central incisors, and left first molars in 20 young adults with largely normal occlusion. Measurements in the rest position, and during chewing and swallowing were made with an extra-oral pressure ...
Yamanaka M - - 1992
Structural modification of the cardiotonic agent, loprinone (E-1020, 1), suggested by data that it has a less positive chronotropic effect than milrinone (15), led us to find novel bradycardic agents that were structurally different from homoveratryl amine derivatives. Alkyl-oxy, -thio, and -amino derivatives at the 2-position of the pyridine ring ...
Wolfe S W - - 1992
Extreme care must be used in positioning patients for surgery in a prone position. A padded Mayfield headrest may not be appropriate for all patients undergoing spinal surgery, as exophthalmus or a flattened nasal bridge may allow transmission of pressure to the globe. Our current approach is to use supplementary ...
McNulty S E - - 1992
STUDY OBJECTIVE: To determine the effects of three different prone support systems (Andrews spinal surgery frame, Cloward surgical saddle, and longitudinal bolsters) on inferior vena cava (IVC) and superior vena cava (SVC) pressures; the validity of measuring central venous pressure (CVP) for the determination of ideal positioning of the patient; ...
Amthor J S - - 1992
Curly dock (Rumex crispus L.) was grown from seed in a glasshouse at an ambient CO(2) partial pressure of about 35 pascals. Apparent respiration rate (CO(2) efflux in the dark) of expanded leaves was then measured at ambient CO(2) partial pressure of 5 to 95 pascals. Calculated intercellular CO(2) partial ...
Ikeda N - - 1992
Experiments were carried out on 15 dogs to investigate the course of respiration and circulation during the agonal period of death due to typical hanging. Animals were asphyxiated by a method simulating typical hanging. Electrocardiogram (ECG), electroencephalogram (EEG), blood pressure (BP) in the femoral artery and intrathoracic pressure (ITP) were ...
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