Background & Aims: Techniques like APACHE IV (Acute Physiology and Chronic Health Evaluation IV) are used extensively for predicting mortality rate of patients with different diagnosis in the intensive care unit who are admitted. These indexes are also considered as a standard tool for studying of hospitalized duration, quality evaluation of care provided and classification of illness severity. The purpose of this study was to determine the predicted mortality rate and duration of hospital stay in-patient admission in intensive care unit with APACHE IV technique.

Materials &Methods: This cross sectional study was conducted to evaluate patients during six months of 2010 of different sections of ICU wards in two health care centers. The study population had a utility profile and demographic and APACHE IV were used.

Results: From 240 patients admitted in ICU, 159 patients (66.3%) remained alive. The mean APACHE IV patients were 50.62 ± 19.07(minimum 13 and maximum 98). The predicted mortality rate using APACHE IV, 11.18 %  and the observed mortality rate was 33.7%. APACHE IV score in survived patients were 44.94 and died patients were 66.77% (P = 0.000, t: 7.10).

Conclusions: The result of the present research showed that the APACHE IV can predict mortality of hospitalized patients in the intensive care unit precisely. So, by using these indicators and other instruments we can classify severity of diseases and expected course of treatment before patients hospitalization in ICU. Evidently further studies in this field should be done.