IRCT20190120042436N1 IRCT 2019-03-06 Yasouj University of Medical Sciences Effect of endotracheal suctioning on hemodynamic and respiratory parameters of patients undergoing mechanical ventilation The comparison effect of combinational changes of catheter size and its related suction negative pressure on hemodynamic and respiratory parameters of patients undergoing mechanical ventilation 2019-03-09 anticipated 35 Complete https://irct.ir/trial/37672 interventional Randomization: N/A, Blinding: Not blinded, Placebo: Not used, Assignment: Single, Purpose: Treatment, Other design features: 35 patients with single-group mechanical ventilation each will be suctioned in 4 times with different catheter sizes and negative pressure. N/A Coma, unspecified. Intervention group: Intervention on 35 patients by single-group method Which will have a tracheal tube under mechanical ventilation Each patient is subjected to suction for 4 times, initially with a catheter of 10 and a negative pressure of 100 For the second time, a catheter of 10 and a negative pressure of 150 For the third time, a catheter of 12 and a negative pressure of 100 and for the fourth time the catheter size 12 and the negative pressure 150 are used and the interval between two suction tracheal suction doses for each patient is at least 2 hours.. Undecided - It is not yet known if there will be a plan to make this available Justification or reason for indecision in sharing IPD is No more information