Wyniki wyszukiwania - BazTech

Ograniczanie wyników

2 Biocybernetics and Biomedical Engineering

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: barotrauma

Sortuj według:

Ogranicz wyniki do:

Choice of proper lung ventilation method

Darowski M., Gólczewski T., Michnikowski M.

Biocybernetics and Biomedical Engineering

2006

Vol. 26, no. 1

21-37

In the article three different methods of lung ventilation have been analyzed: Continuous Positive Airways Pressure (CPAP), Proportional Assist Ventilation (PAV) and Pressure Support Ventilation (PSV). The aim of these analyses was to predict clinical situations when the considered modes of ventilation would play their role in the best, optimal way. The study on effective ventilatory support by CPAP, PAV and PSY was conducted using virtual respiratory system - a new, but yet verified model of the system, recently developed by our group. Computer simulation, done on a healthy lung model and on a pathologically changed lung model, has clearly shown the conditions under which CPAP, PAV or PSY could be really effective. CPAP is worth using in patients with a high airways resistance, in which case this mode of ventilatory support ensures breathing with normal frequency and less energy-consuming inspiration. PAV usually results in a smaller peak and the mean alveolar pressure than PSY which decreases a potentially harmful effect of the positive pressure ventilation on the cardiovascular system. On the other hand, PAV may be used safely when estimation of the parameters such as the lung/thorax compliance and the airway resistance is reliable, since the setting of the supporting pressure is based on this estimation.

Haemodynamic variations during independent lung ventilation in paediatrics

Marraro G. A., Luchetti M., Galassini E. M.

Biocybernetics and Biomedical Engineering

2003

Vol. 23, no. 2

67-76

Independent lung ventilation (ILV) has been suggested in order to reduce volutrauma and barotrauma in the treatment of lung pathology with unilateral prevalence. The application of different PEEP levels to each lung can allow an increase in gas exange and reduce haemodynamic variations connected with high transpulmonary pressure. Application of synchronized ILV with ZEEP or 5 cm H2O PEEP did not in itself cause haemodynamic changes any different from those that occur with intermittent positive pressure ventilation (IPPV) and continuous positive pressure ventilation (CPPV) with 5 cm H2O of positive end-espiratory pressure (PEEP). Maintaining 5 cm H2O of PEEP in the less affected lung and increasing progressively PEEP from 5 to 15 cm H2O in the more pathologic lung, central venous pressure (CVP), cardiac rate and mean arterial pressure (MAP) remained stable. The application of progressive PEEP levels in the less damaged lung while maintaining a stable value in the more damaged lung showed an increase in CVP and cardiac rate and reduction in MAP: Applying synchronised ILV (sILV) an improvement in PaO2 was noted compared to volume controlled ventilation with 10 cm H2O of PEEP. The improvement in PaO2 appears more evident when the "best" PEEP for each lung has been applied.