Feb 9, 2007 - 4:17:00 PM - Print. The fan clutch is an automatic device that is often used in a vehicleâs cooling system. So, when the engine is cool or even when it is at a normal operating temperature, the fan clutch will partially disengage the engineâs radiator cooling fan (which is mechanically driven).
Cerebral hypoxia occurs when there is not enough oxygen getting to the brain. The brain needs a constant supply of oxygen and nutrients to function. Cerebral hypoxia refers to the largest parts of the brain, called the cerebral hemispheres. However, the term is often used to refer to a lack of oxygen supply to the entire brain. In cerebral hypoxia, sometimes only the oxygen supply is interrupted. This can be caused by: Breathing in smoke (smoke inhalation), such as during a fire.
It results from arrhythmias, mechanical abnormalities, or structural abnormalities, and is generally seen in older adults. Cardiac causes of syncope often are unprovoked and are more likely to present in the emergency department. Sudden death in young adults with syncope is often the result of arrhythmias. Orthostatic hypotension can be caused by autonomic dysfunction, medications, or volume depletion resulting in syncope. It is rare in patients younger than 40 years, and is commonly seen in older patients with comorbid conditions.1,6.