Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 33 for “"Tidal Volume"”.
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Influence of tidal volume on pulmonary gas exchange during general anaesthesia
… overweight patients ventilated with increased tidal volume (VT), or normal tidal volume with and without PEEP. Methods: Prospective, randomised, clinical studies. ASA І and II abdominal surgery patients were randomly assigned to be ventilated with normal VT (NVT) with and without PEEP to 10 …
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Die Beatmung mit niedrigen Tidal-Volumina verbessert die zerebrale Gewebeoxygenierung im experimentellen Tiermodell des akuten Lungenversagens
… To investigate the effects of different tidal volumes on cerebral tissue oxygenation. DESIGN: Prospective, controlled animal study.SETTING: Animal research facility of a university hospital.INTERVENTIONS: Two conditions were studied in fourteen female pigs with experimental acute lung …
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Sensory Stimulation to Promote Deep Breathing in the Chronic Obstructive Pulmonary Disease Patient
… while one subject was left in supine position. Tidal volume and end-tidal PCO<sub>2</sub>used to measure effectiveness of sensory stimulation in promoting deep breathing. Tidal volume was computed from minute volume taken on a Bonus Ventilation Monitor LS-75 model. End-tidal PCO<sub>2</sub> was …
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Identifying a minimal sugammadex dosing strategy
… 1mg/kg. To determine residual paralysis tidal volume and negative inspiratory flow will be measured. This quality improvement project has the potential to reduce incidences of residual paralysis in facilities using qualitative assessment.
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Design and prototyping of a low-cost portable mechanical ventilator
… by a 14.8 VDC battery and features an adjustable tidal volume of up to 900 mL, adjustable breaths per minute (bpm) of 5-30, and inhalation to exhalation time ratio (i:e ratio) options of 1:2, 1:3 and 1:4. Tidal volume, breaths per minute and i:e ratio are set via user-friendly knobs, and the …
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Design and Evaluation of a Novel Method to Noninvasively Estimate Tidal Volumes During Administration of Nasal Cannula Therapy
… with a quantitative measurement of a patient's tidal volume, the volume of air inhaled with each breath. This thesis presents a novel approach to measure tidal volume using a nasal cannula with built-in pressure sensors. Pressure waveforms obtained from continuous measurement of the pressure at …
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Die Anwendung supraglottischer Atemwegshilfen durch Medizinstudenten im ersten Semester : eine Untersuchung zum Atemwegsmanagement am Simulator
… to insert the device and insufflate a sufficient tidal volume using an ambu bag. Time to correct placement of the device, number of attempts until sufficient ventilation, tidal volume and order of device usage were documented. In addition, the students were asked to provide a subjective assessment …
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CFD simulation of the airflow through the human respiratory tract
… i.e., 7.5 and 15 breaths per minute with a tidal volume of 0.5 liter. For comparison, the flow rates for constant inspiration/expiration were selected to be identical to the peak flow rates during the transient breathing. Significant differences indicate that simulations that utilize …
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A comparative study of the ventilatory responses of the golden hamster, Mesocricetus auratus and the laboratory rat, Rattus norvegicus, under hypercapnic and/or hypoxic gas mixtures
… Total body plethysmography was used to measure tidal volume (V<sub>T</sub>), respiratory frequency (R<sub>f</sub>), and minute volume (V<sub>E</sub>). The respiratory gases had carbon dioxide concentrations ranging from 0 to 790 and oxygen content ranging from 13 to 21%. Both hypercapnic and …
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Assessment of airflow obstruction from tidal breathing expiratory flow recordings in patients with chronic obstructive pulmonary disease
… and utilisation of novel indices measured from tidal breathing expiratory flow patterns to assess airflow obstruction in adults. The work is in two parts, firstly the development of the data collection protocol and the identification of suitable indices and secondly the evaluation of the …
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Assessing Bovine Methane Emissions: Respiratory Simulation and Optical Gas Imaging Methods
… settings, successfully emulating breath flow, tidal volume, respiration rate, temperature, and methane concentration. The simulator was used in infrared imaging experiments that demonstrated the feasibility of using OGI as a technique for measuring breath methane content. To visualize breath …
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The effects of obesity and surgically-induced weight loss on exercise ventilation: influence of central adiposity and serum leptin
… group differences in maximal ventilation, tidal volume or respiratory rate. Stepwise regression determined that truncal adiposity accounted for 31.5% of variance in VE/VCO2 slope (R= 0.561, R2 =0.315, p = 0.004). At 3 months post-surgery we observed significant reductions in the obese group …
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A Free-Breathing Lung Motion Model
… to local air filling: motion as a function of tidal volume) and β is the parameter that accounts for the motion due to the imbalance of dynamical stress distributions during inspiration and exhalation which cause lung motion hysteresis: motion as a function of airflow). The parameters α and β …
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Cardiorespiratory abnormalities in early and advances stage mouse models of Duchenne muscular dystrophy
… littermates, in part due to slightly increased tidal volume. Likewise, there was no effect of genotype on SaO2. These data suggest that while the dystrophic changes in the diaphragm were severe, overall respiratory status is not severely compromised in 12--16-month-old DMD mice. Altogether, …
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Die Ventilation mit biphasic positive airway pressure (BIPAP) im experimentellen akuten Lungenschaden : der Einfluß des transpulmonalen Drucks auf Gasaustausch und Hämodynamik
… PCVAW and 353±93 ml/min during PCVTP (p<0.005). Tidal volume with PCVTP increased to 11.9±2.3 ml/kg, compared to 8.5±0.8 with BIPAP and 7.6±1.4 with PCVAW (p<0.001) and cardiac output decreased to 3.5±0.6 l/min (BIPAP 4.9±0.8 and PCVAW 3.9±0.8, p<0.006). CONCLUSIONS: In experimental lung injury, …
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Aspects of respiratory function during exercise in the thoroughbred horse in health and disease
… clinical interpretation of some variables, e.g tidal volume, respiratory frequency and minute ventilation, whilst peak flow rates were stable at the highest workloads. Arterial oxygen tension and blood pH during exercise were affected by training but other blood gas variables and end-tidal gas …
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LUNG CLEARANCE INDEX: a new biomarker of ventilation inhomogeneity in pediatric respiratory diseases.
… it is sufficient to breathe with a normal tidal volume during the examination, this examination is particularly suitable for studying respiratory function, even in uncooperative children. Considering the emerging role of the LCI in the evaluation of childhood respiratory diseases, the aims …
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Effekte teilunterstützter Beatmungsmodi auf Hämodynamik, respiratorische Funktion und Gasaustausch beim experimentell induzierten akuten Lungenversagen im Schwein
… lung injury can be avoided by the use of low tidal volume via low peak pressure, which significantly decreases the lethality. Moreover, ventilation allowing spontaneous breathing has shown to be lung protective, as the bad ventilated dorsobasal lungfields are recruited for the gas exchange by …
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Relationship of Ventilation Ability and Positioning in Left-Sided Congestive Heart Failure Patients
… ventilation as measured by specific lung volumes and lung mechanics occurred with upright positioning in normal persons. The effects of specific changes in lung volumes related to position change in congestive heart failure patients has not been documented in literature, although various …
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The impact of pathological ventilation on aerosol deposition : imaging, insight and intervention
… observed variability in the deposition per unit volume among lung lobes was due to heterogeneous ventilation. Using helium-oxygen as a carrier gas for aerosol has been considered as a potential intervention to homogenize deposition in the lung periphery. To investigate this, we repeated the …
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