Navegando por Palavras-chave "Hemodynamic processes"

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    Hemodynamics and renal function during administration of low-dose dopamine in severely ill patients
    (Associação Paulista de Medicina - APM, 2004-01-01) Pereira, Cláudia Nathalie [UNIFESP]; Machado, Flávia Ribeiro [UNIFESP]; Guimarães, Hélio Penna [UNIFESP]; Senna, Ana Paula Resque [UNIFESP]; Amaral, José Luiz Gomes do [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    CONTEXT: Although a large number of studies have been performed regarding the renal and hemodynamic effects of the infusion of low-dose dopamine (LDD) in severely ill patients, there is still controversy on this subject. OBJECTIVE: To evaluate the effects of dopamine (2 mug/kg/min) on systemic hemodynamics (lowest mean arterial pressure, MAP, highest heart rate, HR, central venous pressure, CVP), creatinine clearance (CLcr), diuresis and fractional sodium excretion (FENa+). TYPE OF STUDY: A non-randomized, open, prospective clinical trial. SETTING: An intensive care unit in a tertiary university hospital. PARTICIPANTS: 22 patients with hemodynamic stability admitted to the intensive care unit. PROCEDURES: Patients were submitted to three two-hour periods: without dopamine (P1), with dopamine (P2) and without dopamine (P3). MAIN MEASUREMENTS: The abovementioned variables were measured during each period. CLcr was assessed based upon the formula U x V/P, where U is urinary creatinine (mg/dl), V is diuresis in ml/min and P is serum creatinine (mg/dl). FENa+ was calculated based upon the formula: urinary sodium (mEq/l) x P/plasma sodium (mEq/l) x U) x 100. Results were presented as mean and standard deviation. The Student t test was used and results were considered significant if p was less than 0.05. RESULTS: Twelve patients (seven males and five females) were included, with a mean age of 55.45 years. There was no significant variation in MAP, HR, CVP, CLcr or FENa+ with a dopamine dose of 2 mug/kg/min. On the other hand, diuresis significantly increased during P2, from 225.4 to 333.9 ml. CONCLUSION: Infusion of 2 mug/kg/min of dopamine for 2 hours increases diuresis. At the doses studied, dopamine does not induce significant alterations in MAP, HR, CVP, CLcr and FENa+.
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    Posição prona
    (Sociedade Brasileira de Pneumologia e Tisiologia, 2005-08-01) Paiva, Kelly Cristina De Albuquerque [UNIFESP]; Beppu, Osvaldo Shigueomi [UNIFESP]; Universidade Federal de São Paulo (UNIFESP)
    The prone position is a maneuver used to combat hypoxemia in patients with acute respiratory distress syndrome. Despite the fact that this is currently considered an efficient way to improve oxygenation, the physiological mechanisms that bring about improvements in respiratory function are not yet fully understood. The aim of this review is to discuss the physiological and clinical aspects of the prone position in patients with acute respiratory distress syndrome.