Objective: The objective of the present study is to determine the incidence of delirium and the associated factors in patients undergoing open heart surgery. Methods: This is an Analytic-descriptive study conducted on 404 patients undergoing elective open heart surgery in Fatemeh Zahra Heart Center. Sari. over the period of 6 months from July to December 2011. https://www.roneverhart.com/Fisher-Price-Koala-Apaisant/