There was a statistically significant among the studied patients regarding the association between duration of mechanical ventilation and the prevalence of PPCs, in which PPCS more occurred in patients whose spends more time on mechanical ventilation. This result is constant with Mathis et al., (2019), which about “Intraoperative mechanical ventilation and postoperative pulmonary complications after cardiac surgery” who revealed that, there was a statistically significant among the studied patients regarding the association between duration of mechanical ventilation and the prevalence of PPCs, in which patients with PPCs were connected with mechanical ventilator for long period than patients without PPCs, also he reported that, early weaning from mechanical ventilation provide pulmonary function and reduce incidence of postoperative pulmonary complications.