Recent study demonstrated that heart rate and blood pressure were changed after VHI in ICU patients but the condition of patients in their study were mixed, not only traumatic patients. Previous study showed that basal heart and blood pressure were increased in patients underwent traumatic conditions. The hemodynamic responses to VHI were required for safety and increasing physiotherapist's confidences to use this technique in ICU. Therefore, the purpose of this study is to explore acute hemodynamic responses to VHI technique in critical traumatic patients with pulmonary complications in the intensive care unit.