الفهرس 
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Abstract
A quasi-experimental study design was used in this study to determine the effect of position on respiratory mechanics, gas exchange and hemodynamic parameters in patients suffering of acute respiratory failure under mechanical ventilation. The sample was 30 patients with respiratory failure under mechanical ventilation admitted to the intensive care unite in Ismailia University Hospital. The result of this study showed that, regard ventilator parameters, respiratory rate significantly increased in prone position (P.P) and reduced in the supine position (S.P). Regarding the respiratory mechanics, peak inspiratory pressure (PIP) showed increase in all (Left lateral (L.L.P), P.P, Right lateral (R.L.P), and S.P, thereby; there was significant reduction in the dynamic compliance in the same positions. Mean airway pressure showed significant increase in lateral positions (L.L.P and R.L.P). Air way resistance showed significant increase in L.L.P and P.P. Regarding the gas exchange parameters, P.P significantly improves the partial pressure of arterial oxygen and oxygen index. L.L.P significantly improves partial pressure of arterial oxygen. R.L.P significantly improves the CO2 washing more than other positions. Regarding hemodynamic parameters, L.L.P significantly increases the systolic and diastolic blood compared to the other positions, while R.L.P significantly decreases the diastolic blood pressure. Finally, P.P significantly increases the systolic blood pressure and cardiac output.