Articles: extravascular-lung-water.
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At birth, the initiation of pulmonary gas exchange is dependent on air entry into the lungs, and recent evidence indicates that pressures generated by inspiration may be involved. We have used simultaneous plethysmography and phase-contrast X-ray imaging to investigate the contribution of inspiration and expiratory braking maneuvers (EBMs) to lung aeration and the formation of a functional residual capacity (FRC) after birth. Near-term rabbit pups (n = 26) were delivered by cesarean section, placed in a water plethysmograph, and imaged during the initiation of spontaneous breathing. ⋯ The incidence of EBMs was rare early during lung aeration, with most (>80%) occurring after >80% of max FRC was achieved. Although EBMs were associated with an overall increase in FRC, 34.8 +/- 5.3% of EBMs were associated with a decrease in FRC. We conclude that lung aeration is predominantly achieved by inspiratory efforts and that EBMs help to maintain FRC following its formation.
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Following the acute changes of lung resection surgery, does the ratio of intrathoracic blood volume (ITBV) to global end diastolic volume (GEDV) remain constant? If it does this could validate a single thermo dilution (STD) technique in the measurement of extravascular lung water index (EVLWI) in patients undergoing lung resection surgery. EVLWI was derived using both double dye technique (DDT) and single thermo dilution technique (STD) in four patients undergoing thoracotomy selected for major lung resection surgery. Regular measurements were made for up to 12 h after surgery. ⋯ EVLWI measurements measured by STD correlate well with those of DDT. This preliminary study suggests that EVLWI measurements by STD could be used to measure changes in EVLW following major lung resection. An assessment of EVLW could be useful in early diagnosis, management and treatments of the devastating condition of postoperative acute lung injury.
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The purpose of our study was to evaluate the maternal cardiopulmonary function and lung water content during percutaneous fetoscopic interventions under general maternal-fetal anaesthesia and continuous tocolytic medication. ⋯ In mid-gestational women undergoing percutaneous fetoscopic interventions under general maternal-fetal anaesthesia, cardiopulmonary function remained stable. However, a moderate increase in EVLW and pulmonary vascular permeability indicates an increased risk for maternal pulmonary oedema.
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Am. J. Respir. Crit. Care Med. · Jan 2009
Endothelin-1 impairs alveolar epithelial function via endothelial ETB receptor.
Endothelin-1 (ET-1) is increased in patients with high-altitude pulmonary edema and acute respiratory distress syndrome, and these patients have decreased alveolar fluid reabsorption (AFR). ⋯ We provide the first evidence that ET-1, via an endothelial-epithelial interaction, leads to decreased AFR by a mechanism involving activation of endothelial ETB receptors and NO generation leading to alveolar epithelial Na,K-ATPase down-regulation in a cGMP-independent manner.