[Erica respirator (Engström). Presentation and evaluation].
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Biomedical subjects
Publications and source records attributed to J Labrousse.
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Acute epiglottitis is much less frequent in adults than in children. Three personal cases are reported and clinical findings associated with epiglottitis in adults are reviewed; sudden onset of acute respiratory failure is outlined. Mechanical desobstruction of airway may be required promptly, tracheostomy being often preferred to tracheal intubation. Overall prognosis has been evaluated from 130 cases reported in the literature in the last twenty years: the mortality rate, reaching 24,6 per cent in 73 cases published between 1958 and 1973, has been reduced to 5 per cent in 60 most recent cases. This improvement reflects a better understanding of the disease and as more properly defined therapy.
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In a group of 14 patients (7 males and 7 females) ventilated artificially for acute respiratory distress syndrome, the authors defined a level of optimal expiratory positive pressure giving an FiO2 = 1, an arterial pO2 greater than or equal to 400 mmhg and/or an intrapulmonary shunt less than or equal to 15%. Improvement in arterial pO2 under such conditions would appear to be related to maximum alveolar recrutment. This optimal level of expiratory positive pressure would appear to be independent of values of total static pulmonary compliance. The long term use of this technique would seem to be encouraging.
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To determine the influence of intermittent positive pressure breathing (IPPB), the level of pulmonary capillary wedge pressure (PCWP) was compared during IPPB and after a short period off the respirator in 68 occasions on 42 patients with an acute respiratory failure (ARF) of various etiologies. During IPPB, the average PCWP was in the normal range in patients with toxic or neurologic comas and in cases of increased pulmonary capillary permeability edema (IPCPE), PCWP slightly increased within chronic obstructive pulmonary disease (COPD) complicated with ARF and in hemodynamic acute pulmonary edema (HAPE). During the weaning stage, PCWP decreased in the groups of coma, COPD, and IPCPE, but increased in HAPE. The weaning test demonstrates that IPPB influenced PCWP in all patients. Therefore, PCWP cannot be assumed to represent the left ventricle filling pressure. The weaning test allows differentiation of IPCPE from HAPE. In the event of over-infusion or hypovolemia, PCWP measured under IPPB can lead to misinterpretation if not followed up by a second measurement off the respirator.