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 left with a permanent tracheostomy. Voice rehabilitation in such patients can be achieved through 3 important ways - esophageal speech, tracheoesophageal puncture or electrolarynx. One would likely require the help of intensive teaching and speech therapy and/or an electronic device. Cancer of the trachea is a rare cancer which can be similar to head and neck cancer, and is sometimes classified as such. Most tumors of the salivary glands differ from the common carcinomas of the head and neck in cause, histopathology, clinical presentation, and therapy. Other uncommon tumors arising in the head and neck include teratomas, adenocarcinomas, adenoid cystic