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 Head and Neck Cancer Alliance The Head and Neck Cancer Alliance (HNCA) is a non-profit organization that works with health professionals and organizations, celebrities and survivors to enhance the overall effort in prevention, treatment, and detection of cancers of the head and neck region. The Head and Neck Cancer Alliance was established in 2008. Formerly the Yul Brynner Head and Neck Cancer Foundation, HNCA activities include: • Providing support to head and neck cancer patients throughout the year • Supporting ongoing research in head and neck oncology • Educating children and adults in the disease process, treatment and prevention of