Final answer:
The patient presents with a GCS score of at least 8, with a 2 in eye response and a 2 in verbal response; motor response cannot be fully assessed from the information provided but would be at least a 4.
Step-by-step explanation:
To determine the patient's Glasgow Coma Scale (GCS) score, we need to assess three categories: eye response, verbal response, and motor response. In the scenario provided, the patient does not open his eyes in response to voice, which gives an eye score of 2 (no eye opening). He mumbles something when attempting to move his head, suggesting some form of verbal response, which gives a verbal score of 2 (incomprehensible sounds).
There was no motor response described in the scenario, but typically if a patient moves in response to pain or attempts to move spontaneously, this would be at least a 4 on the motor scale (withdraws from pain). Without specific details on the motor response, we cannot accurately assign a full GCS score. However, based on the provided information, the GCS score would be at least 8 (E2+V2+M4), indicating severe brain injury.