Elevated refractory intracranial pressure is a common problem encountered in the management of severe traumatic brain injury. The staircase approach, which incorporates tier zero to three therapies, has been reported to reduce elevated intracranial pressure and produce favorable outcomes. However, the synergistic effects of these therapies on intracranial pressure (refractory intracranial hypertension) and cerebral perfusion pressure during the overall treatment period have not been well elucidated. Herein, we report the case of a 32-year-old man who sustained severe traumatic brain injury with refractory intracranial hypertension. After several treatment modalities were employed, including 3% hypertonic saline, target temperature management, and decompressive craniectomy, the patient achieved satisfactory recovery. We analyzed changes in intracranial pressure and cerebral perfusion pressure to evaluate the synergistic effect of these treatments on increased refractory intracranial pressure.