The purpose of this study is to determine an optimum lung hyperinflation volume that will produce minimal changes in mean arterial pressure (MAP) and prevent post-suctioning hypoxemia. The sample will consist of 50 male post-coronary artery bypass graft patients who are at least four hours post surgery and determined to be hemodynamically stable according to set criteria. The subjects will receive three consecutive lung hyperinflations at one of the four randomly ordered volumes (12cc/Kg, 14cc/Kg, 16cc/Kg, and 18cc/Kg of lean body weight) in 15 seconds via the Ma1 ventilator """"""""sigh"""""""" control at FI02 100% MAP will be monitored continuously. The lung hyperinflation will be immediately followed by suctioning with a 14FR catheter. Suction (200mmHg flow rate 16L/min) will be applied to the catheter continuously while rotating and withdrawing for 10 seconds. The three lung hyperinflations (at the set volume, followed by suctioning will be repeated x 3. Following the last suction pass, arterial blood gases will be withdrawn at time 0, 30, 60, 120, 180, and 300 seconds post-suctioning. The protocal will be repeated one hour later until all four folumes have tested. The results of this study will provide nurses with parameters for administering lung hyperinflation to critically ill patients.
| Stone, K S; Bell, S D; Preusser, B A (1991) The effect of repeated endotracheal suctioning on arterial blood pressure. Appl Nurs Res 4:152-8 |
| Stone, K S; Preusser, B A; Groch, K F et al. (1991) The effect of lung hyperinflation and endotracheal suctioning on cardiopulmonary hemodynamics. Nurs Res 40:76-80 |
| Stone, K S; Talaganis, S A; Preusser, B et al. (1991) Effect of lung hyperinflation and endotracheal suctioning on heart rate and rhythm in patients after coronary artery bypass graft surgery. Heart Lung 20:443-50 |
| Stone, K S; Vorst, E C; Lanham, B et al. (1989) Effects of lung hyperinflation on mean arterial pressure and postsuctioning hypoxemia. Heart Lung 18:377-85 |
