venous is the type of blood vessels which carry blood from organs to the heart.
venous is the type of blood vessels which carry blood from organs to the heart.
name the type of blood vessels which carry blood from organs to the heart?
venous
in patients who have high icp due to an acute injury, it is particularly important to ensure adequate airway, breathing, and oxygenation. inadequate blood oxygen levels (hypoxia) or excessively high carbon dioxide levels (hypercapnia) cause cerebral blood vessels to dilate, increasing the flow of blood to the brain and causing the icp to rise. inadequate oxygenation also forces brain cells to produce energy using anaerobic metabolism, which produces lactic acid and lowers ph, also dilating blood vessels and exacerbating the problem. conversely, blood vessels constrict when carbon dioxide levels are below normal, so hyperventilating a patient with a ventilator or bag valve mask can temporarily reduce icp. hyperventilation was formerly a part of the standard treatment of traumatic brain injuries, but the induced constriction of blood vessels limits blood flow to the brain at a time when the brain may already be ischemic—hence it is no longer widely used. furthermore, the brain adjusts to the new level of carbon dioxide after 48 to 72 hours of hyperventilation, which could cause the vessels to rapidly dilate if carbon-dioxide levels were returned to normal too quickly. hyperventilation is still used if icp is resistant to other methods of control, or there are signs of brain herniation, because the damage herniation can cause is so severe that it may be worthwhile to constrict blood vessels even if doing so reduces blood flow. icp can also be lowered by raising the head of the bed, improving venous drainage. a side effect of this is that it could lower pressure of blood to the head, resulting in a reduced and possibly inadequate blood supply to the brain. venous drainage may also be impeded by external factors such as hard collars to immobilize the neck in trauma patients, and this may also increase the icp. sandbags may be used to further limit neck movement.
intracranial pressure
vein









































veins are blood vessels that carry blood toward the heart. most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart. in contrast to veins, arteries carry blood away from the heart.









































veins are less muscular than arteries and are often closer to the skin. there are valves in most veins to prevent backflow.









































section::::structure.
vein