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 cancer, which is attributed to advanced stage disease at the time of diagnosis. Early detection is imperative for increasing chances of survival. Free screening clinics for head and neck cancers during Oral, Head and Neck Cancer Awareness week, sponsored by the Head and Neck Cancer Alliance, provides opportunities for earlier diagnosis of malignant cancer. Screenings for oral, head and neck cancer are generally available via your local physician, dentist and other healthcare facilities. The Head and Neck Cancer Alliance offers free screenings nationwide;free screenings are offered predominantly during Oral, Head and Neck Cancer Awareness Week in April at healthcare events