The objectives of this analytical-descriptive study were determinig the incidence of nosocomial pneumonia as a result of aspiration among the hospitalized patients in the intensive care units of Tehran university of medical sciences in 1999.For collecting data, the applied instruments consisted of: Glucose oxidase tape, thermometers, blood tests, chest radiography, culture from endotracheal secretions and checklists.The samples, consisting 80 patients, were assigned into 2 groups according to the day starting gavage: the first group included 50 patients from the first day connecting to ventilator and second group included 30 patients from the second day connecting to ventilator.Following nearly 5 months of sampling incidence of nosocomial pneumonia resulting from aspiration estimated to 31.2%with an interval estimation of 21%<<41 %. Moreover, incidence of nosocomial pneumonia lacking aspiration estimated to 18.7% with an interval estimation of 1 l%<<27%.The results indicated that remaining the nosogastric tube and early gavaging of the patients under ventilation can be effective risk factors in the incidence of nosocomial pneumonia. Furthermore, the most pulmonary infiltration was happened in the upper lobe of the right pulmonary. Therefore, it could be supposed that the patients during aspiration had been mainly slept on their back.

Keywords: incidence of pneumonia, nosocomial pneumona

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