This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Miscellaneous, Subject name: Surgery
All of the following Clinical Features are seen in isolated head injury except 
Select and explain. 
A. Vomiting, B. Hypertension, C. Airway compromise, D. Seizures
B: Hypertension
Answer: B: Hypertension 
Explanation: (B) Hypertension # History of Head Injury reveals: Mechanism of injury Loss of consciousness or amnesia Level of consciousness at scene and on transfer Evidence of seizures Probable hypoxia or hypotension Pre-existing medical conditions Medications (especially anticoagulants) Illicit drugs and alcohol> Causes of Brain Injury Hypoxia: P02 < 8 kPa Hypotension: Systolic blood pressure (SBP) <90 mmHg Raised intracranial pressure (ICP): ICP > 20 mmHg Low cerebral perfusion pressure (CPP): CPP <65 mmHg Pyrexia Seizures Metabolic disturbance.