Air embolism and veins is greater than atmospheric pressure, an air embolus does not often happen when a blood vessel is injured. In the veins above the heart, such as in the head and neck, the venous pressure may be less than atmospheric and an injury may let air in. This is one reason why surgeons must be particularly careful when operating on the brain, and why the head of the bed is tilted down when inserting or removing a central venous catheter from the jugular or subclavian veins. When air enters the veins, it travels to the right side of the
Head and Neck Cancer Alliance day are 20 times more likely to develop head and neck cancer in comparison to non-drinkers. Some symptoms of head and neck cancer are soreness of the throat, difficulty in jaw movement or swallowing, and the presence of a nodule or lump. The stage of the disease is a determining factor in deciding the prognosis of head and neck cancer. There is a correlation between disease stage, survival and quality of life. The median five-year survival drops significantly from about 80% with the presence of regional or distant metastasis. Nearly 8000 people die every year due to head and neck