COMMUNICATIONSTO THE EDITOR 551 arteriovenous oxygen content difference (C[a-v]02) equals 3; and the fractional concentration of oxygen in the inspired gas (F1o2) equals 0.40. From the oxyhemoglobin dissociation curve, the arterial oxygen saturation equals 0.90. Since C(a-v)O, equals 3, the venous oxygen saturation (Sv02) equals 0.75 approximately. Using these figures, the QS/QT equals 0.502. T...

OBJECTIVES To investigate the severity and duration of hypoxaemia in 703 children with severe or very severe pneumonia presenting to Goroka Hospital in the Papua New Guinea highlands; to study the predictive value of clinical signs for the severity of hypoxaemia, the predictive value of transcutaneous oxygen saturation (SpO2) and other variables for mortality. DESIGN Prospective evaluation of...

We introduce a new multi aperture system capable of capturing six identical images of the human fundus at six different spectral bands. The system is based on a lenslet array architecture and is well suited for spectroscopy application. The multi-aperture system was interfaced with a fundus camera to acquire spectroscopic sensitive images of the retina vessel and ultimately to calculate oxygen ...

OBJECTIVE To evaluate quality of sleep and pulmonary function in clinically stable adolescents with sickle cell anemia (SCA). METHODS A cross-sectional descriptive study involving 50 patients with SCA submitted to nocturnal polysomnography and spirometry at the Brasília University Hospital. Anthropometric, polysomnographic and pulmonary function data were analyzed. Patients were divided into ...

BACKGROUND Transition from a parallel circulation in utero to an in-series circulation immediately after birth is partly an oxygen-dependent process. Relative hypoxemia with increasing altitude above sea level exerts a certain degree of stress on oxygen-dependent metabolic processes throughout the body. OBJECTIVE The present study aimed to determine the reference values for oxygen saturation ...

OBJECTIVE To evaluate the behavior of oxygen saturation curves throughout the six-minute walk test (6MWT) in patients with COPD. METHODS We included 85 patients, all of whom underwent spirometry and were classified as having moderate COPD (modCOPD, n = 30) or severe COPD (sevCOPD, n = 55). All of the patients performed a 6MWT, in a 27-m corridor with continuous SpO2 and HR monitoring by telem...

Introduction: Patients with pulmonary fibrosis experience early oxyhemoglobin desaturation under effort, which limits their ability to exercise and quality of life. Recent studies have shown that in resting normoxaemic patients who become hypoxemic exertion, administration outpatient oxygen significantly improves stress dyspnoea It is unclear how this happens, since does not act directly on dys...