Browsing by Author "Diaz, O"

Now showing 1 - 6 of 6
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    Breathing pattern and gas exchange at peak exercise in COPD patients with and without tidal flow limitation at rest
    (EUROPEAN RESPIRATORY SOC JOURNALS LTD, 2001) Diaz, O; Villafranca, C; Ghezzo, H; Borzone, G; Leiva, A; Milic Emili, J; Lisboa, C
    Expiratory flow limitation (FL) at rest is frequently present in chronic obstructive pulmonary disease (COPD) patients. It promotes dynamic hyperinflation with a consequent decrease in inspiratory capacity (IC), Since in COPD resting IC is strongly correlated with exercise tolerance, this study hypothesized that this is due to limitation of the maximal tidal volume (VT,(max)) during exercise by the reduced IC, The present study investigated the role of tidal FL at rest on: 1) the relationship of resting IC to VT,(max) and 2) on gas exchange during peak exercise in COPD patients.
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    Effects of noninvasive ventilation on lung hyperinflation in stable hypercapnic COPD
    (EUROPEAN RESPIRATORY SOC JOURNALS LTD, 2002) Diaz, O; Begin, P; Torrealba, B; Jover, E; Lisboa, C
    Two previous uncontrolled studies have suggested that noninvasive mechanical ventilation (NIMV) in patients with hypercapnic chronic obstructive pulmonary disease (COPD) improves arterial blood gas tensions by decreasing lung hyperinflation with the consequent reduction in inspiratory loads and changes in ventilatory pattern. The aim of this randomised placebo-controlled study was to determine whether these mechanisms play a pivotal role in the effects of NIMV on arterial blood gases.
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    Invasive exercise testing in the evaluation of patients at high-risk for lung resection
    (MUNKSGAARD INT PUBL LTD, 1998) Ribas, J; Diaz, O; Barbera, JA; Mateu, M; Canalis, E; Jover, L; Roca, J; Rodriguez Roisin, R
    The aim of this study was to investigate whether invasive exercise testing with gas exchange and pulmonary haemodynamic measurements could contribute to the preoperative assessment of patients with lung cancer at a high-risk for lung resection,
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    Physiological and clinical effects of diurnal noninvasive ventilation in hypercapnic COPD
    (EUROPEAN RESPIRATORY SOC JOURNALS LTD, 2005) Diaz, O; Begin, P; Andresen, M; Prieto, ME; Castillo, C; Jorquera, J; Lisboa, C
    To assess the clinical impact of noninvasive mechanical ventilation (NIMV) on stable hypercapnic chronic obstructive pulmonary disease, changes in exercise capacity, dyspnoea and simple physiological parameters were evaluated. The time course of these effects during treatment and recovery was also assessed.
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    Role of inspiratory capacity on exercise tolerance in COPD patients with and without tidal expiratory flow limitation at rest
    (2000) Diaz, O; Villafranca, C; Ghezzo, H; Borzone, G; Leiva, A; Milic-Emil, J; Lisboa, C
    Expiratory flow limitation promotes dynamic hyperinflation during exercise in chronic obstructive pulmonary disease (COPD) patients with a consequent reduction in inspiratory capacity (IC), limiting their exercise tolerance. Therefore, the exercise capacity of patients with tidal expiratory flow limitation (FL) at rest should depend on the magnitude of IC, The presented study was designed to evaluate the role of FL on the relationship between resting IC, other respiratory function variables and exercise performance in COPD patients,
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    Use of methylene blue in patients with refractory septic shock: Impact on hemodynamics and gas exchange
    (W B SAUNDERS CO, 1998) Andresen, M; Dougnac, A; Diaz, O; Hernandez, G; Castillo, L; Bugedo, G; Alvarez, M; Dagnino, J
    Purpose: The purpose of this study was to assess the acute effects of methylene blue, an inhibitor of nitric oxide synthesis, on hemodynamics and gas exchange in patients with refractory septic shock in a prospective clinical trial at medical and surgical intensive care units in a tertiary university hospital.