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Evaluation of a humidified nasal high-flow oxygen system, using oxygraphy, capnography and measurement of upper airway pressures.
Anaesth Intensive Care
November 2011
Critical Care Complex, Middlemore Hospital, Auckland, New Zealand.
In this study, we evaluated the performance of a humidified nasal high-flow system (Optiflow, Fisher and Paykel Healthcare) by measuring delivered FiO, and airway pressures. Oxygraphy, capnography and measurement of airway pressures were performed through a hypopharyngeal catheter in healthy volunteers receiving Optiflow humidified nasal high flow therapy at rest and with exercise. The study was conducted in a non-clinical experimental setting.
View Article and Find Full Text PDFOxygraphy: an unexplored perioperative monitoring modality.
J Clin Monit Comput
June 2009
Department of Anesthesia, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, Kerala, India.
Capnography waveforms and capnometry are useful perioperative monitoring tools. The paramagnetic oxygen analyzers incorporated in many clinical monitoring systems estimate oxygen concentration in the breathing circuit during various phases of ventilation. The oxygen concentration is plotted as a real-time waveform and displayed as an oxygraph.
View Article and Find Full Text PDFBubble continuous positive airway pressure enhances lung volume and gas exchange in preterm lambs.
Am J Respir Crit Care Med
July 2007
School of Women's and Infants' Health, The University of Western Australia, Perth, Australia.
Rationale: The technique used to provide continuous positive airway pressure (CPAP) to the newborn may influence lung function and breathing efficiency.
Objectives: To compare differences in gas exchange physiology and lung injury resulting from treatment of respiratory distress with either bubble or constant pressure CPAP and to determine if the applied flow influences short-term outcomes.
Methods: Lambs (133 d gestation; term is 150 d) born via cesarean section were weighed, intubated, and treated with CPAP for 3 hours.
Disconnect alarm failure in detection of common gas outlet disconnection.
Anaesth Intensive Care
December 1998
Department of Anaesthesia, Christchurch Hospital, New Zealand.
This laboratory study was prompted by two paediatric cases where low pressure alarms and capnography failed to detect common gas outlet disconnection when using a T-piece pump ventilator. A carbon dioxide producing model lung was ventilated using the Clare ventilator (a T-piece pump type ventilator) via an Ayres T-piece. The T-piece used has 3 mm diameter fresh gas tubing.
View Article and Find Full Text PDF[Monitoring respiratory mechanism and gas exchange in patients on respirators (side stream spirometry, capnography, oxigraphy, measurement of anesthetic agent concentration, pulse oximetry)].
Orv Hetil
September 1993
Anaesthesiologiai és Intenzív Betegellátó Osztálya, Szent Rókus Kórház és Rendelöintézet Budapest.
Author describes the working principles of the side stream spirometry, capnography, oxygraphy, anaesthetic agent concentration measurement, pulse oximetry, all of them incorporated in a new type of monitor, as well as the informations obtained by using them, concerning lung mechanics and gas exchange. The graphic and digital data, provided by the monitor are visualizing the correlations among the components of lung mechanics and are helping in setting up optimal ventilatory parameters, both during anaesthesia and during ventilation in an intensive care unit. The monitor approaches gas exchange from several aspects, which enhances the judgement of the efficacy of ventilation.
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