This video shows the demonstration of the Extended reality (XR) trauma patient care simulation in the hybrid emergency room system (HERS). The HERS is a novel trauma resuscitation room equipped with a computed tomography (CT) scanner, fluoroscopy, and operating room set-up. In the HERS, CT scans can be done during the primary survey without transferring the patient from the resuscitation room to the CT scan suite. Surgeons and interventional radiologists (IRs) can perform damage control surgery and endovascular procedures simultaneously or subsequently in the same room. Simulation involving the multidisciplinary team was needed to learn the new trauma patient care flow in the HERS. The authors developed a HERS trauma patient care simulation model using XR technology. XR is a general term for virtual reality (Virtual Reality: VR), augmented reality (Augmented Reality: AR) and mixed reality (Mixed Reality: MR). The three-dimensional (3D) image of the whole-body CT scan of a blunt polytrauma patient was turned into the hologram by a medical image VR / MR automated application. Participants were able to view the 3D CT images stereoscopically by attaching MR wearable glasses. To assist in spatial recognition of stereopsis, AR and MR techniques was applied by superimposing the hologram on the mannequin during the simulation in the HERS. Further evaluations of this model by trauma care providers are warranted. In future, this technology could be extended to actual trauma patient care if clinicians become accustomed to practicing with the holographic lens attached.