Although weaning success rates was higher in ASV group, it was statistically insignificant between both group. This could
be explained by the demographic variables of the patients as well as the parameters that affect weaning process were com- parable in both studied group. In addition the evaluation of the weaning indices aids in identifying the causative factor of MV weaning failure, which can then be treated. Death during hospitalization, in fact, was low in our study as this could be explained by the selection of patients and exclusion criteria especially those with high category APACHE-II score. This was probably one of the reasons why there was no significant difference between groups in mortality. The cause of death could not be considered in our analysis, since information ob- tained by telephone was not always sufficiently precise in addi- tion to lack of collaboration (after ICU discharge).