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Wingo Jonathan E JE Institute for Exercise and Environmental Medicine, Presbyterian Hospital of Dallas, Texas 75231, - - 2008
Hypercapnia may be encountered in lung disease as well as during situations involving rebreathing of previously expired air (e.g., occupational diving). Inhibitory effects of elevated arterial carbon dioxide partial pressure on the central nervous system may result in impaired thermoregulation. This study tested the hypothesis that in heat-stressed subjects, cutaneous ...
Sassa Naoto - - 2009
OBJECTIVES: To examine the direct renal hemodynamics during carbon dioxide pneumoperitoneum in both human and porcine models. Laparoscopic living donor nephrectomy has become widespread because of its minimally invasive nature. However, it has been clear that the renal hemodynamics and function are affected during carbon dioxide pneumoperitoneum. METHODS: The erythrocyte ...
Hammell C - - 2008
We present three patients with respiratory failure in whom conventional mechanical lung ventilation resulted in unacceptably high levels of carbon dioxide, severe acidosis and high vasopressor requirements. A pumpless arteriovenous extracorporeal carbon dioxide removal device (Novalung) was inserted. Arterial carbon dioxide levels were reduced rapidly with a corresponding increase in ...
Samolski D - - 2008
BACKGROUND AND AIM: Carbon dioxide (CO2) rebreathing is a complication of non-invasive ventilation (NIV). Our objectives were to evaluate the ability of masks with exhaust vents (EV) to avoid rebreathing while using positive pressure (PP) NIV with different levels of expiratory pressure (EPAP). Concerning volume-cycled NIV, we aimed to determine ...
Lujan Manel - - 2008
BACKGROUND: In spontaneously breathing patients, the differences between arterial PaCO2 and end-tidal CO2 (EtCO2) and the influence of bronchial obstruction have not clearly established. MATERIAL/METHODS: This was a prospective observational study. Patients (n=120) were classified according to spirometric criteria into groups with normal, mild, moderate, and severe obstruction. Arterial blood ...
Ainslie Philip N - - 2008
Changes in the partial pressure of arterial CO2 (PaCO2) regulates cerebrovascular tone and dynamic cerebral autoregulation (CA). Elevations in PaCO2 also increases autonomic neural activity and may alter the arterial baroreflex. We hypothesized that hypercapnia would impair, and hypocapnia would improve, dynamic CA and that these changes would occur independently ...
Salihoglu Ziya - - 2008
Pneumothorax is rare but can be a severe complication of laparoscopic surgery. Diagnosis of pneumothorax in laparoscopy includes the sudden increase in end-tidal carbon dioxide (EtCO(2)) with a decrease in compliance and an abnormal increase in airway pressure. By these case reports, we recommend the simultaneous monitoring of airway pressures, ...
Arikan Yüksel - - 2008
BACKGROUND: Laparoscopic surgical techniques have been increasingly preferred to classic laparotomy by surgeons since 1987. The pneumoperitoneum is often used to facilitate the intra-abdominal field, but it carries the risk of its ischemic potential and has differences [l2]of metabolic, inflammatory, and infectious consequences, depending on the pressure set and kind ...
Garey Donna M - - 2008
OBJECTIVE: Colorimetric carbon dioxide detectors are used for confirmation of endotracheal intubation. The colorimetric carbon dioxide detectors that are used for neonates are labeled for use with infants and small children >1 and <15 kg. The objective of this study was to determine the minimal tidal volume that causes a ...
Enekvist Bruno J - - 2008
STUDY OBJECTIVE: To determine if a large tidal volume (VT), with an unchanged end-tidal carbon dioxide partial pressure (PETco2), could improve arterial carbon dioxide elimination, oxygen saturation (Spo2), and arterial blood oxygenation. DESIGN: Prospective, randomized, clinical study. SETTING: Single university hospital. PATIENTS: 60 ASA physical status I and II patients ...
Kamolpornwijit Wiboon - - 2008
OBJECTIVE: To study the effects of intraperitoneal CO2 insufflation on cardiopulmonary variables in gynecological laparoscopic patients. MATERIAL AND METHOD: A prospective descriptive study of BP, HR, End tidal CO2, and Sat O2 in 30 gynecologic patients who underwent laparoscopic surgery between 1 September 2006 and 30 July 2007. RESULTS: Blood ...
Turnbull D - - 2008
Carbon dioxide is known to affect consciousness in animals and humans. We surmised that changes in end-tidal carbon dioxide during anaesthesia might affect the Bispectral Index. Twenty-four patients due to undergo surgery were anaesthetised with fentanyl and a propofol infusion. The Bispectral Index, pulse rate and blood pressure were recorded ...
Bellingham Geoff A - - 2008
PURPOSE: Patients with uncorrected or palliated, complex congenital heart lesions requiring surgery can benefit from laparoscopic techniques, but retroperitoneal insufflation may render them hemodynamically unstable. Alterations in cardiopulmonary physiology during retroperitoneal insufflation have been studied, yet there are no cases detailing this approach in patients with congenital heart lesions. We ...
Iglesias-Rodriguez M Debora - - 2008
Ocean acidification in response to rising atmospheric CO2 partial pressures is widely expected to reduce calcification by marine organisms. From the mid-Mesozoic, coccolithophores have been major calcium carbonate producers in the world's oceans, today accounting for about a third of the total marine CaCO3 production. Here, we present laboratory evidence ...
Balderi Tania - - 2008
BACKGROUND: Morbid obesity, compromising cardiovascular and respiratory function, may increase the risk of anesthesia and was initially considered a contraindication to laparoscopy. The aim of this study was to investigate hemodynamic effects induced by pneumoperitoneum in superobese patients, assessed by arterial pulse contour method. METHODS: We prospectively studied 10 obese ...
Dilmore Robert M - - 2008
Experiments were conducted to determine the solubility of CO2 in a natural brine solution of the Oriskany formation under elevated temperature and pressure conditions. These data were collected at temperatures of 22 and 75 degrees C and pressures between 100 and 450 bar. Experimentally determined data were compared with CO2 ...
Ishimatsu, Atsushi
This paper describes our recent experimental results to elucidate the effects of high CO2 on a deep-sea fish. A few species can be captured alive from depths of ca. 400 meters and be used for in vivo CO2 exposure experiments. We have developed an experimental setup that allows us to ...
Jaber Samir - - 2008
BACKGROUND: The effects of hypercapnic acidosis on the diaphragm and its recovery to normocapnia have been poorly evaluated. The authors studied diaphragmatic contractility facing acute variations of arterial carbon dioxide tension (Paco2) and evaluated the contractile function at 60 min after normocapnia recovery. METHODS: Thirteen piglets weighing 15-20 kg were ...
Schmidt C - - 2008
Cytoreductive surgery with hyperthermic intraperitoneal chemotherapy (HIPEC) is a long and complex procedure with significant blood and fluid loss during debulking and important pathophysiological alterations during the HIPEC phase. We performed a retrospective analysis of 78 consecutive patients undergoing cytoreductive surgery with HIPEC at a university hospital. Our data demonstrate ...
Dehghani Fariba - - 2008
In this study for the first time the effect of high-pressure CO2 on the coacervation of alpha-elastin was investigated using analytical techniques including light spectroscopy and attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopic imaging and circular dichroism (CD) spectroscopy. The coacervation behavior of alpha-elastin, a protein biopolymer, was determined ...
Sun Yan - - 2008
The sorption isotherms of CO2 + CH4 mixtures on an activated carbon were collected in the presence of water at a temperature suitable for hydrate formation. The equilibrium composition of both phases was determined. The initial concentration of CO2 in mixtures was set at 33, 38 and 42%, and the ...
De Baerdemaeker L E C - - 2008
BACKGROUND: There are no guidelines on ventilation modes in morbidly obese patients. We investigated the effects of volume-controlled (VCV) and pressure-controlled ventilation (PCV) on gas exchange, respiratory mechanics, and cardiovascular responses in laparoscopic gastric banding procedures. METHODS: After Institutional Review Board approval, 24 adult consenting patients scheduled for laparoscopic gastric ...
Bhat Y R - - 2008
INTRODUCTION: Continuous noninvasive monitoring of the partial pressure of arterial carbon dioxide (PaCO2) in ventilated neonates would help clinicians to reduce arterial blood sampling. Our objective was to determine the correlation and agreement between end-tidal carbon dioxide (EtCO2) and PaCO2 in newborns ventilated for various clinical situations. METHODS: This prospective ...
Aittokallio Jenni - - 2008
While there are a number of studies demonstrating association between arterial oxyhaemoglobin saturation events during sleep and markers of vascular impairment, the contribution of peripheral carbon dioxide to the development of atherosclerosis is poorly understood. We used ultrasound imaging to measure carotid artery intima-media thickness (IMT), as well as flow-mediated ...
Dubin Arnaldo - - 2008
Intramucosal acidosis, that it is to say, an increased intramucosal-arterial PCO2 difference, is a common finding in clinical and experimental sepsis. Nevertheless, the physiologic significance of increases in tissue PCO2 is controversial, since CO2 can be generated by both aerobic and anaerobic biochemical processes. PCO2 can rise after buffering of ...
Kilty Brennan G - - 2008
We describe work completed and discuss future work on the automation of a real-time, non-invasive method for calculating Cardiac Output. This method [1] uses concentrations of oxygen and carbon dioxide in the inspiration and exhalation segments of a breath cycle, atmospheric pressure, and total respiratory degrees ow to estimate the ...
Weil Max Harry - - 2008
Kolar and colleagues contribute an additional and important incentive for rescuers to utilize end-tidal carbon dioxide tensions as a routine monitor to guide management and decision-making during cardiopulmonary resuscitation. They conclude that below-threshold levels of 14 mmHg (1.5 kPa) measured after 20 minutes of cardiopulmonary resuscitation reliably predict that spontaneous ...
Brown S J - - 2008
Human heart rate variability (HRV) was examined during a mild respiratory acidosis induced by inhalation of a normoxic hypercapnic gas mixture. On two separate occasions, separated by 72 but not more than 120hr, ECG was recorded from 9 normotensive subjects during supine rest. ECG was recorded for 20 min breathing ...
Niklason Lisbet - - 2008
Alveolar dead space reflects phenomena that render arterial partial pressure of carbon dioxide higher than that of mixed alveolar gas, disturbing carbon dioxide exchange. Right-to-left shunt fraction (Qs/Qt) leads to an alveolar dead space fraction (VdAS/VtA; where VtA is alveolar tidal volume). In acute respiratory distress syndrome, ancillary physiological disturbances ...
Kolar Miran - - 2008
Prognosis in patients suffering out-of-hospital cardiac arrest is poor. Higher survival rates have been observed only in patients with ventricular fibrillation who were fortunate enough to have basic and advanced life support initiated soon after cardiac arrest. An ability to predict cardiac arrest outcomes would be useful for resuscitation. Changes ...
Nickol Annabel H - - 2008
Noninvasive ventilation (NIV) improves gas-exchange and symptoms in selected chronic obstructive pulmonary disease (COPD) patients with hypercapnic respiratory failure. We hypothesized NIV reverses respiratory failure by one or all of increased ventilatory response to carbon-dioxide, reduced respiratory muscle fatigue, or improved pulmonary mechanics. Nineteen stable COPD patients (forced expiratory volume ...
Peng Tingying - - 2008
The effect of spontaneous beat-to-beat mean arterial blood pressure (ABP) fluctuations and breath-to-breath end-tidal carbon dioxide (PETCO2) and end-tidal oxygen (PETO2) fluctuations on beat-to-beat cerebral bloodflow velocity (CBFV) variations is studied using a multiple coherence function. Multiple coherence is a measure of the extent to which the output, CBFV, can ...
Yoshida Hitoshi - - 2007
Hypercapnia during laparoscopy with CO2 is predicted in the following situations: compromised pulmonary function, retroperitoneal insufflation, and subcutaneous emphysema. We present a case of sudden electroencephalogram (EEG) depression in response to severe hypercapnia during laparoscopic ureteronephrectomy in a 77-yr-old patient with chronic pulmonary emphysema. During intraperitoneal and retroperitoneal insufflation, subcutaneous ...
Hirabayashi G - - 2008
BACKGROUND: Large quantities of water condensation occur in the anaesthesia circuit during low-flow anaesthesia. We hypothesized that cooling of the CO2 absorbent would prevent water condensation. METHODS: To cool CO2 absorbent efficiently, we constructed a novel temperature gradient reduction (TGR) canister, which was cooled by a blower. Experiments were divided ...
Riebesell U - - 2007
The oceans have absorbed nearly half of the fossil-fuel carbon dioxide (CO2) emitted into the atmosphere since pre-industrial times, causing a measurable reduction in seawater pH and carbonate saturation. If CO2 emissions continue to rise at current rates, upper-ocean pH will decrease to levels lower than have existed for tens ...
Zhang J - - 2007
We report a higher precision measurement of the refractive index of carbon dioxide using a frequency comb as the light source in a Mach-Zehnder interferometer setup. The experimental sensitivity can reach the level of 8.8x10(-9). Taking into account the measurement accuracy of temperature and pressure, the experimental accuracy has a ...
von Delius S - - 2007
BACKGROUND AND STUDY AIMS: The aim of this experimental study was to assess the effect of gastric insufflation on intra-abdominal pressure (IAP) and associated hemodynamic and respiratory changes during upper gastrointestinal endoscopy. METHODS: Measurements were taken from pigs under general anesthesia with controlled ventilation. Gastroscopy was carried out with continuous ...
Ozgonul Abdullah - - 2007
OBJECTIVE: To investigate the effects of isothermic or hypothermic carbon dioxide used for pneumoperitoneum during laparoscopic cholecystectomy on blood gases. METHODS: Between 2004 and 2006, 62 patients (American Society of Anesthesiologists grade I, II, and III for elective laparoscopic cholecystectomy) (age between 18 and 70 years), were enrolled in this ...
Sibai A N AN Department of Anesthesiology, American University of Beirut Medical Center, Beirut, - - 2007
The authors report a case of 66-year-old female patient, 55 kg, ASA I who, under general anesthesia in supine position, developed gradual hypoxemia (from a baseline PaO2 of 250 to 91 mmHg), carbon dioxide build up (from a baseline PaCO2 31 to 41 mmHg) associated with gradual hyperthermia up to ...
Yazigi Alexandre A Department of Anesthesia and Intensive Care, Hotel-Dieu de France Hospital, School of Medicine, Saint Joseph University, Beirut, - - 2007
to assess the accuracy of nasal capnography for the monitoring of ventilation in extubated morbidly obese patients, following bariatric surgery. prospective descriptive study. Post-anesthesia care unit. 25 consecutive morbidly obese patients admitted to the PACU after open bariatric surgery. Patients had a nasal cannula designed to administer oxygen (3 L/min) ...
Sáenz J - - 2007
Increased intrabdominal pressure induced by pneumoperitoneum induces modifications in cardiovascular and respiratory systems. The aim of the study was to analyze the hemodynamic and respiratory modifications produced by pneumoperitoneum during living donor nephrectomy in a porcine experimental model. Twenty pigs underwent left nephrectomy, 10 by laparoscopy and 10 by an ...
Bliacheriene F - - 2007
BACKGROUND: Pulse pressure variation (DeltaPP) and systolic pressure variation (SPV) induced by mechanical ventilation have been proposed to detect hypovolaemia and guide fluid therapy. During laparoscopic surgery, chest compliance is decreased by pneumoperitoneum. This may affect the value of SPV and DeltaPP as indicators of intravascular volume status. Thereby, we ...
Milton Claire C - - 2008
Carbon dioxide is a commonly used anaesthetic in Drosophila research. While any detrimental effects of CO2 exposure on behaviour or traits are largely unknown, a recent study observed significant effects of CO2 exposure on rapid cold hardening and chill-coma recovery in Drosophila melanogaster. In this study we investigated the effect ...
Stanopoulos I - - 2007
We report three cases of mechanically ventilated chronic obstructive pulmonary disease patients who were intubated due to an exacerbation of their disease and who presented with repeated spontaneous breathing trial failures. Patients were given 50 mg of sildenafil through the nasogastric tube, under close monitoring of haemodynamic and ventilatory parameters. ...
Maharjan S K - - 2007
PURPOSE: The purpose of this study was to assess the effects of hyperventilation on patients undergoing laparoscopic surgeries on haemodynamics, partial pressure of carbon dioxide and acid base status. METHODS: 60 patients undergoing laparoscopic surgeries under General Anaesthesia were randomized into two groups, "control group" ventilated with tidal volume of ...
Tosun Murat - - 2007
During laparoscopic surgery, gases such as carbon dioxide (CO(2)), helium, or normal air are insufflated into the intra-abdominal cavity so the surgeon can obtain a clear surgical field; however, this insufflation technique may cause injury to the intra-abdominal organs. This study was undertaken to evaluate the effects of different pressures ...
Almeida-Junior Armando A - - 2007
OBJECTIVES: To evaluate the association between deadspace/tidal volume ratio (Vd/Vt) and gas exchange variables: Pao2, Paco2, Pao2/Fio2, arterial/alveolar oxygen tension ratio (Pao2/PAo2), alveolar-arterial oxygen tension difference/arterial oxygen tension ratio (P(A-a)o2/Pao2), carbon dioxide production (Vco2), ventilation index ([Paco2 x peak inspiratory pressure x mechanical respiratory rate]/1000), and oxygenation index ([mean airway ...
Vivien B - - 2007
BACKGROUND AND OBJECTIVE: Diagnosis of brain death usually requires the absence of spontaneous respiratory movements during the apnoea test and an arterial carbon dioxide partial pressure above 60 mmHg. On the other hand, although capnography (end-tidal CO(2)) is currently monitored in intensive care unit patients, it has not been evaluated ...
Avital Shmuel - - 2007
INTRODUCTION: There are currently no reports in the literature regarding changes in end-tidal carbon dioxide (ETCO(2)) when the small bowel is deliberately or inadvertently perforated during laparoscopic surgery. The aim of this study was to assess the influence of small bowel perforation during laparoscopy on ETCO(2) in a rat model. ...
Connolly Desmond - - 2007
PURPOSE: The relationship between hyperventilation and the associated increase in flicker sensitivity is poorly defined but may be relevant to display viewing. This exploratory study investigates the potential for quantifying the relationship between the severity of hypocapnia and critical flicker frequency (CFF). METHOD: Repeated ascending (fusion) and descending (flicker) measurements ...
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