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 and other related functions. The Head and Neck Cancer Alliance has also developed a free app on iTunes to assist people with screening themselves for head and neck cancer; the app is available at https://itunes.apple.com/us/app/head-and-neck-check/id784226942?mt=8. It was found that awareness about oral cancer among patients in Jordan is low. These patients, especially those in high-risk groups for mouth cancer and those of lower socio-economic status, are less well informed about the signs and risk factors of oral cancer. Interventions to improve public knowledge about oral cancer and attitudes towards early diagnosis and treatment are urgently indicated. Head and Neck Cancer