Our study has several limitations. Because the study was retrospective in nature, some inconsistencies in charting may have led to missing data. In addition, we were unable to collect data on weaning from mechanical ventilation from the charts; instead, only data on number of days intubated were included in this review. Since ventilator weaning is a common reason for referral to CPT, future prospective studies could be designed to determine whether CPT facilitates weaning in this patient population.