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Cardio-respiratory parameters in old and young mechanically ventilated rats. Mean arterial pressure (MAP), cardiac output (CO) and arterial oxygen tension (PaO2) in old (white circles) versus young (black circles) rats in minutes after initiation of mechanical ventilation (MV) with tidal volume (VT) of 8, 16 or 24 ml/kg body weight, respectively. * = P <0.05 old vs. young animals; #, § = P <0.05 time point vs. start of MV.
