## 3 Results
### Varied Effects of ETT and SC on PIP in Both Respiratory Systems  
Although VC-CMV enables the patient to receive a specific minute volume of ventilation, PIP varies in line with the change in the pulmonary mechanic of respiratory systems. The study examined the PIP effects on VC-CMV of endotracheal tubes paired with suction catheters in the closed suctioning system on two different pulmonary mechanics. Figure 2 shows an increase in PIP levels with a progressive decline in pulmonary mechanics during VC-CMV, with or without closed suctioning. The results exhibit significantly raised PIP levels along with a decline in pulmonary mechanics and small IDs of the endotracheal tubes.  
\begin{table}
\begin{tabular}{c c c c c c c c c c c c} \hline \hline  & \multicolumn{6}{c}{**(\& \multicolumn{6}{c}{**UG Objective Respiratory System**} & \multicolumn{6}{c}{**PC-CMV**} \\ \cline{3-10}
**Variable** & \begin{tabular}{c} **R\({}_{\text{cr}}\)** \\ **(a H\({}_{\text{c}}\)O-1-a)** \\ \end{tabular} & **Mean** & **SD** & \(p\)**Value** & **Post Hoc Test** & \
\begin{tabular}{c} **Linear Trend Analysis** \\ **\(p\)-Value** \\ \end{tabular} & **Mean** & **SD** & \(p\)**Value** & **Post Hoc Test** &
\begin{tabular}{c} **Linear Trend Analysis** \\ **\(p\)-Value** \\ \end{tabular} \\ \cline{3-10}  & 5 & 13.58 & 8.12 & & 40:30 : 20 : 30 : 5 & 14.80 & 5.47 & 40:30 : 30 : 30 : 30 : 5 & \\ R\({}_{\text{corr}}\) & 10 & 15.58 & 8.51 & & 5.50 & 5.12 & \\ (m H\({}_{\text{corr}}\)-1-a) & 20 & 27.74 & 7.75 & & -0.01 & -0.01 & 19.72 & 5.50 & -0.01 & -0.01 \\ (m H\({}_{\text{corr}}\)-1-a) & 20 & 25.62 & 25.84 & & & 21.23 & 5.30 & & & \\ (m H\({}_{\text{corr}}\)-1-a) & 20 & 25.79 & 2.81 & & & 9.14 & 4.11 & & & \\ (m H\({}_{\text{corr}}\)-1-a) & 20 & 10.56 & 2.86 & & -0.01 & -0.01 & 12.70 & 4.27 & -0.01 & & -0.01 \\ (m H\({}_{\text{corr}}\)-1-a) & 20 & 11.59 & 2.90 & & & 13.44 & & & & \\ (m H\({}_{\text{corr}}\)-1-a) & 20 & 13.87 & 3.12 & & & 13.99 & 5.30 & & & \\ \hline  & \multicolumn{6}{c}{**(\& \multicolumn{6}{c}{**UG-CMV**} & \multicolumn{6}{c}{**IC-CMV**} \\ \cline{3-10}
**Variable** & \begin{tabular}{c} **C\({}_{\text{cr}}\)** \\ **(a-m H\({}_{\text{corr}}\)-1-a)** \\ \end{tabular} & **Mean** & **SD** & \(p\)**Value** & **Post Hoc Test** & \
\begin{tabular}{c} **Linear Trend Analysis** \\ **\(p\)-Value** \\ \end{tabular} & **Mean** & **SD** & \(p\)**Value** & **Post Hoc Test** &
\begin{tabular}{c} **Linear Trend Analysis** \\ **\(p\)-Value** \\ \end{tabular} \\ \hline  & 0.01 & 13.94 & 9.36 & & & & 12.84 & 7.22 & & \\ R\({}_{\text{corr}}\) & 0.02 & 11.35 & 2.85 & & & 14.02 & 6.86 & & -0.01 & \\ (m H\({}_{\  
In the obstructive respiratory system (Figure 2a), the PIP level for the pairing of a 6.5 mm endotracheal tube with 10 Fr SC (6.5 mm\(-\)10 Fr) was higher than for the pairing of an 8.0 mm endotracheal tube with 14 Fr SC (8.0 mm\(-\)14 Fr). The PIP level rose further with progressive R\({}_{\rm aw}\) pulmonary mechanics. While the distance between the two curves (with suction and without a range) for a 6.5 mm endotracheal tube was higher than for an 8.0 mm endotracheal tube, the distance diminished in the case of progressively severe R\({}_{\rm aw}\). In restrictive respiratory systems, the PIP level rose in line with the decrease in the endotracheal tubes' IDs and compliance levels (Figure 2b). The result indicated that the PIP level was affected by the endotracheal tubes' IDs and the pulmonary mechanics; the severe decline in lung compliance curbed this effect.