Search Results
Results 401 - 450 of 1376
< 4 5 6 7 8 9 10 11 12 13 14 >
Jawan B - - 2000
BACKGROUND: We experienced a case of accidental administration of 100% carbon dioxide (CO2) during anesthesia, which resulted in cardiac arrest. After successful cardio-pulmonary resuscitation the child recovered without brain damage. This outcome was quite different than that of the more commonly reported accidental administration of 100% nituous oxide (N2O), as ...
Giebler R M - - 2000
BACKGROUND: The authors hypothesized that intraperitoneal and retroperitoneal carbon dioxide insufflation during surgical procedures evoke markedly different effects on the venous low-pressure system, induce different inferior caval vein pressure gradients at similar insufflation pressures, and may provide evidence for the Starling resistor concept of abdominal venous return. METHODS: Intra- and ...
Taki K - - 2000
BACKGROUND: We sought to evaluate the parameters of CO2 transport during the administration of acetazolamide in order to assess the role of carbonic anhydrase in CO2 transport. MATERIALS AND METHODS: The partial pressure of carbon dioxide in tissue (PtCO2), arterial blood (PaCO2) and end-tidal gas (PETCO2) were monitored to study ...
Casati A - - 2000
We prospectively evaluated the effects of pneumoperitoneum and reverse Trendelenburg position on cardiopulmonary function in 20 ASA physical status II-III morbidly obese patients (body mass index > 35 kg m(-2)) undergoing laparoscopic gastric banding. After general anaesthesia was induced, patients' lungs were ventilated using intermittent positive pressure ventilation (at measurement ...
Frietsch T - - 2000
BACKGROUND: Gas exchange during high-frequency jet ventilation (HFJV) for prolonged rigid bronchoscopy (RBS) is usually monitored by arterial blood gas analysis. Capnography of expired gases during brief HFJV discontinuation may be a reliable and noninvasive supplemental method. Capnography can be performed either for single breaths or with respiratory rate (RR) ...
Kuntz C - - 2000
BACKGROUND: According to the literature, the number of port-site metastases in laparoscopic surgery varies considerably depending on the type of gas used for the pneumoperitoneum. In order to investigate this observation we studied the changes in blood, subcutaneous, and intra-abdominal pH during laparoscopy with helium, CO(2) and room air in ...
Loughnan T E - - 2000
The divided nasal cannula is a device recently released in Australia that couples oxygen delivery and end-tidal carbon dioxide (PETCO2) monitoring. This study compares the accuracy of PETCO2 measurements by the divided nasal cannula and those measured by a modified facemask (as currently used in this institution), with arterial partial ...
Alper C M - - 2000
OBJECTIVE: To determine if middle ear (ME) gas composition and/or total pressure regulates local mucosal blood flow (MBF) and vascular permeability. The hypotheses tested are: (1) relatively high local CO2 tensions and/or low O2 tensions increase the ME MBF and vascular permeability; and (2) sub-atmospheric total ME pressure provokes similar ...
Beulen P - - 2000
Routine cerebral ultrasound examinations of the neonatal brain often show the choroid plexus to be enlarged, without revealing any other structural pathology. This enlargement might be due to congestion of the choroid plexus as a result of increased cerebral blood flow, due to increased partial pressure of carbon dioxide, amongst ...
Neto F J - - 2000
To evaluate the effect of changing the mode of ventilation from spontaneous to controlled on the arterial-to-end-tidal CO2 difference [P(a-ET)CO2] and physiological dead space (VD(phys)/VT) in laterally and dorsally recumbent halothane-anesthetized horses. STUDY DESIGN; Prospective, experimental, nonrandomized trial. Seven mixed breed adult horses (1 male and 6 female) weighing 320 ...
Morgan M R - - 2000
This study determined the effects of intravenous ampicillin, cefazolin, and cefoxitin on blood pressures and heart rates in healthy, anesthetized dogs. Forty dogs were each randomly assigned to a control, ampicillin, cefazolin, or cefoxitin group. Antibiotics or saline was delivered by intravenous bolus prior to surgical stimulation. Heart rate; systolic, ...
D'Ugo D - - 2000
BACKGROUND: This study aimed by means of transesophageal echocardiography, to evaluate hemodynamic changes induced by pneumoperitoneum in patients with normal cardiac performance. METHODS: In this study, 11 ASA I-II patients (mean age, 39 years) with normal cardiac performance undergoing laparoscopic cholecystectomy were evaluated. A 5-MHz transesophageal biplane phased-array transducer connected ...
Axelsson H - - 2000
The aim of this project was to study respiration, circulation, and brain activity in pigs during and after a blast wave exposure. Ten anesthetized pigs were used. Seven were exposed to blast and three were controls. Physiological parameters of respiration and circulation as well as cortical activity were followed from ...
Babenco H D - - 2000
BACKGROUND: In doses typically administered during conscious sedation, remifentanil may be associated with ventilatory depression. However, the time course of ventilatory depression after an initial dose of remifentanil has not been determined previously. METHODS: In eight healthy volunteers, the authors determined the time course of the ventilatory response to carbon ...
Rudmann, Silvia G.
The atmospheric (CO2) partial pressure is expected to continue to increase and the scenario is that the CO2 partial pressure will reach 50-70 Pa during the 21st century.The rise in CO2 will have a direct influence on plant growth and development because CO2 is the primary substrate for photosynthesis.The aim ...
Breen P H - - 2000
Traditionally, the study of CO2 and O2 kinetics in the body has been mostly confined to equilibrium conditions. However, the peri-anesthesia period and the critical care arena often involve conditions of non-steady state. The detection and explanation of CO2 kinetics during non-steady state pathophysiology have required the development of new ...
Nienow J A - - 2000
The potential of air regeneration system based on the growth of microalgae on the surface of porous ceramic tubes is evaluated. The algae have been maintained in the system for extended periods, up to 360 days. Preliminary measurements of the photosynthetic capacity have been made for Chlorella vulgaris (UTEX 259), ...
Brock H - - 2000
We investigated the haemodynamic and respiratory effects of one-lung ventilation and carbon dioxide insufflation in 13 adult patients undergoing video-assisted thoracoscopy. Cardiorespiratory variables were determined during carbon dioxide insufflation at intrahemithoracic pressures of 5, 10 and 15 mmHg, and after 5 and 15 min of one-lung ventilation. Carbon dioxide insufflation ...
Cerný V - - 2000
Gastric or intestinal luminal tonometry is a method for monitoring critically ill patients. It offers an index of the adequacy of aerobic metabolism in a tissue that is particularly sensitive to alterations in its perfusion and oxygenation: the gut mucosa. It is based on the measuring the increase in tissue ...
Bennett-Guerrero E - - 2000
BACKGROUND: A new automated system of air tonometry (Tonocap; Datex Ohmeda, Helsinki, Finland) allows for frequent (every 15 min) measurement of gastric luminal partial pressure of carbon dioxide. Its use has not been described in cardiac surgical patients. METHODS: One hundred patients undergoing coronary artery bypass graft or cardiac valve ...
Aneman A - - 2000
OBJECTIVE: To find out what effect insufflation pressure and type of gas have on intestinal perfusion during pneumoperitoneum. DESIGN: Randomized, controlled, prospective, experimental study. SETTING: University affiliated animal experimental laboratory, Sweden. ANIMALS: Fasted, anaesthetised, domestic pigs of both sexes operated on laparoscopically (n = 7, weight 26-31 kg). INTERVENTIONS: Insufflation ...
Lindberg L - - 2000
End-tidal CO2 concentration correlates with pulmonary blood flow during cardiopulmonary resuscitation and has been claimed to be a useful tool to judge the effectiveness of chest compression. A high concentration of end-tidal CO2 has been related to a better outcome. However, most authors have noticed a decrease in end-tidal CO2 ...
Sakata S - - 1999
A 3-year-old girl with pectus excavatum successfully underwent exploration using video-assisted thoracic surgery. A complete pericardial defect was identified. The lung was kept totally collapsed during the procedure using low-flow (1 L/min), low-pressure (7 mmHg) carbon dioxide insufflation. This technique is expected to be a safe adjunct to thoracoscopic procedures ...
Michael J A - - 1999
Approximately 700 undergraduates studying physiology at community colleges, a liberal arts college, and universities were surveyed to determine the prevalence of our misconceptions about respiratory phenomena. A misconception about the changes in breathing frequency and tidal volume (physiological variables whose changes can be directly sensed) that result in increased minute ...
Johnson J L - - 1999
In anesthetized, mechanically ventilated patients, 10 cm H2O positive end-expiratory pressure (PEEP10) immediately decreased the CO2 volume exhaled per breath (V(CO2,br)) by 96%, as exhaled tidal volume (VT) decreased to expand functional residual capacity during the first 8 breaths after PEEP10 began. Then, the sustained decrease in V(CO2,br) for over ...
Francis D P - - 1999
Oscillations in oxygen uptake (V(O2)) and carbon dioxide production (V(CO2)) in patients with chronic heart failure differ in amplitude and phase from the oscillations in ventilation (periodic breathing, PB), leading some to doubt whether they result from PB. We applied Fourier transforms to a pulmonary gas exchange model to quantify ...
Teppema L J - - 1999
Improvement of blood gases with the carbonic anhydrase inhibitor acetazolamide in some patients with chronic obstructive pulmonary disease (COPD) is believed to result from an effect on the ventilatory control system. Carbonic anhydrase is ubiquitously present within the body, particularly in tissues involved in the control of breathing. Because low ...
Dauger S - - 1999
Normal control of breathing is characterized by maintenance of CO2 and O2 arterial pressures at constant levels by appropriate ventilatory responses to changes in CO2 production and O2 consumption. Abnormal development of this regulatory system during embryogenesis may produce early impairments in chemosensitivity, as in congenital central hypoventilation syndrome. The ...
Adcock J - - 1999
A patient underwent laparoscopy for a rectovaginal mass, dysmenorrhea, and infertility. After CO(2) pneumoperitoneum was established the laparoscope was placed without difficulty. Before the procedure was completed, the tubes were insufflated with air through a 20-ml syringe attached to a Cohen cannula. Tubes were patent. No other intraabdominal manipulation was ...
Bícego-Nahas K C - - 1999
We assessed the seasonal variations in the effects of hypercarbia (3 or 5% inspired CO2) on cardiorespiratory responses in the bullfrog Rana catesbeiana at different temperatures (10, 20 and 30 degrees C). We measured breathing frequency, blood gases, acid-base status, hematocrit, heart rate, blood pressure and oxygen consumption. At 20 ...
Adding L C - - 1999
Nitric oxide (NO) is present in exhaled air and is a regulator of airways and pulmonary vasculature. Exhaled NO can be depressed by inhaled carbon dioxide (CO2). To further characterize this, single-breath exhaled NO of rabbits was measured in vivo as well as in buffer-perfused lungs. Effects of bilateral carotid ...
Schlager A - - 1999
BACKGROUND: Carbon dioxide concentration under ophthalmic drapes increases during eye surgery under local anaesthesia. A new prototype has been designed which combines continuous suction of carbon dioxide enriched air and continuous oxygen insufflation under ophthalmic drapes to prevent carbon dioxide accumulation in spontaneously breathing patients undergoing cataract surgery. METHODS: In ...
Hardman J G - - 1999
The alveolar deadspace as a fraction of alveolar ventilation (VDalv/VTalv), while technically difficult to measure, is an objective monitor of pulmonary disease progression and a predictor of successful weaning from mechanical ventilation. The aim of the study was to examine the relationship between the arterial to end-tidal PCO2 gradient (Pa-E'CO2) ...
Diemunsch P - - 1999
BACKGROUND/PURPOSE: Endoscopic surgery of the retroperitoneal space in children is developing. During preliminary clinical experience, the authors were surprised by the differences observed in comparison with laparoscopic pneumpoeritoneum (PNOP); retropneumpoeritoneum (RPNOP) seemed to have less ventilatory repercussions. METHODS: The authors therefore undertook a study on animal models. Six suckling pigs, ...
Stojeba N - - 1999
We report a case of a major venous argon embolism during argon beam coagulation of a liver biopsy. The essential signs were an abrupt reduction in end-tidal carbon dioxide partial pressure, in SpO2 and in systolic arterial pressure, at the time of coagulation. Spontaneous recovery was observed within 10 min. ...
Stegmann G F - - 1999
Xylazine, midazolam and a midazolam/ketamine combination were administered to 6 goats in a randomised 3-way block design. All goats received all treatments with at least a 7-day interval between treatments. Statistically significant (P < 0.05) changes were observed in some of the measured cardiopulmonary variables for xylazine and midazolam/ ketamine. ...
Edelman G - - 1999
Cerebral venous blood gas values have been used to indicate brain tissue oxygenation. However, it is not clear how cerebral tissue and venous measures may vary under physiologic conditions caused by arteriovenous shunt. The purpose of this study was to measure brain tissue and local cerebral venous oxygen (PO2) and ...
Suematsu T - - 1999
To investigate the effects of laparoscopic surgery on the progression of cancers, it is necessary to establish a reliable and economical animal model. We describe a convenient murine pneumoperitoneal model for the study of laparoscopic cancer surgery. Under anesthesia using diethyl ether, peritoneal cavity was insufflated with gas through an ...
Panerai R B - - 1999
Arterial pCO2 is known to influence cerebral autoregulation but its effect on the dynamic relationship between mean arterial blood pressure (ABP) and mean cerebral blood flow velocity (CBFV), obtained from spontaneous fluctuations in ABP, has not been established. In 16 normal subjects, ABP was measured non-invasively (Finapres), CBFV was estimated ...
Hong J Y - - 1999
We investigated the ventilatory changes in healthy patients without cardiopulmonary pathology during elective laparoscopic cholecystectomy in the head-up position. During surgery, intraabdominal pressure was maintained at 15 mmHg by a CO2 insufflator, and minute ventilation was controlled with a constant tidal volume and fixed respiratory rate. PETCO2 was monitored continuously ...
Alpard S K - - 1999
To evaluate the effect of percutaneous arteriovenous carbon dioxide removal (AVCO2R) on ventilator pressures and P/F ratio in a clinically relevant large-animal model of severe respiratory failure. AVCO2R was developed as a simple arteriovenous shunt with a commercially available low-resistance gas exchange device of sufficient surface area for near-total CO2 ...
Korte S M - - 1999
The purpose of this investigation was to determine whether two-week-old rapidly growing broiler chickens with high metabolic activity have an increased risk of the development of heart failure three to five weeks later. The incidence of cardiac arrhythmias was assessed in broiler chickens with either a relatively high carbon dioxide ...
Wenzel U - - 1999
OBJECTIVE: The aim of the study was to test the applicability of Ventrak 1550/Capnogard 1265 (V-C) for respiratory dead space (VD) measurement and to determine anatomic (VDana), physiologic (VDphys), and alveolar dead spaces (VDalv) in ventilated neonates. DESIGN: Prospective study. SETTING: Neonatal intensive care unit. PATIENTS: 33 investigations in 22 ...
Silva A - - 1999
BACKGROUND: Intraluminal endoscopy during laparoscopy can substitute for manual palpation in defining anatomy and pathology, but a potential problem is the persistent bowel distention associated with intraluminal air insufflation. METHODS: To compare the rates of intraluminal absorption, a 30-cm segment of small bowel with an intact vascular supply was insufflated ...
De Robertis E - - 1999
OBJECTIVE: Aspiration of dead space (ASPIDS) improves carbon dioxide (CO2) elimination by replacing dead space air rich in CO2 with fresh gas during expiration. The hypothesis was that ASPIDS allows normocapnia to be maintained at low tidal volumes (VT). DESIGN: Prospective study. SETTING: Adult intensive care unit in a university ...
Ohtsuka T - - 1999
BACKGROUND: The hemodynamic effects of carbon dioxide insufflation under single-lung ventilation were studied in 22 consecutive thoracoscopic harvests of the left internal mammary artery, which was used for minimally invasive coronary artery bypass grafting. METHODS: An electrocardiograph, arterial catheter, Swan-Ganz catheter, and transesophageal echocardiograph were used to monitor seven hemodynamic ...
Schlager A - - 1999
Carbon dioxide accumulation under ophthalmic drapes is caused by their impaired permeability to exhaled carbon dioxide in spontaneously breathing patients. Three different ophthalmic drapes were examined under clinical conditions. Sixty unpremedicated patients of each gender, aged over 60 years and with an ASA status of I-III undergoing cataract surgery under ...
Zwischenberger J B - - 1999
BACKGROUND: In previous animal studies, arteriovenous CO2 removal (AVCO2R) achieved significant reduction in ventilator pressures and improvement in the Pao2 to fraction of inspired oxygen ratio during severe respiratory failure. For our initial clinical experience, 5 patients were approved for treatment of severe respiratory failure and CO2 retention to evaluate ...
Venkatesh B - - 1999
OBJECTIVE: To characterize the incidence and severity of splanchnic ischemia, as defined by gastric tonometry, in patients with isolated severe head injury and to examine the relationship between cerebral hemodynamics and splanchnic ischemia. DESIGN: Prospective observational study. SETTING: Neurosurgical intensive care unit in a tertiary referral center. PATIENTS: Ten patients ...
Volz J - - 1999
OBJECTIVE: Any route of entry into the abdomen contributes to alterations of the intraperitoneal organs with different clinical consequences. Characteristic alterations of the peritoneum after CO2 pneumoperitoneum used in laparoscopic surgery is examined. METHODS: A CO2 pneumoperitoneum with an intraperitoneal pressure of 6 mmHg was applied for 30 min in ...
< 4 5 6 7 8 9 10 11 12 13 14 >