Search results
Results From The WOW.Com Content Network
A greyout is a transient loss of vision characterized by a perceived dimming of light and color, sometimes accompanied by a loss of peripheral vision. [1] It is a precursor to fainting or a blackout and is caused by hypoxia (low brain oxygen level), often due to a loss of blood pressure. Greyouts have a variety of possible causes:
Greyout – a loss of color vision; Blackout – a complete loss of vision but retaining consciousness; and; G-LOC – where consciousness is lost. Under negative g, blood pressure will increase in the head, running the risk of the dangerous condition known as redout, with too much blood pressure in the head and eyes.
Butter Bar – A second lieutenant, due to the gold color of his rank insignia. "By your leave sir/ma'am." – Used with a salute prior to passing senior officers who might be advancing in the same direction; protocol states the senior must acknowledge by returning salute with phrase "Carry on" before the junior passes on the left. [29]
Low blood pressure and a fast heart rate after the event may indicate blood loss or dehydration, while low blood oxygen levels may be seen following the event in those with pulmonary embolism. [1] Routine broad panel laboratory testing detects abnormalities in <2–3% of results and is therefore not recommended.
The National Air and Space Museum (NASM) of the Smithsonian Institution is a museum in Washington, D.C., in the United States, dedicated to human flight and space exploration. Established in 1946 as the National Air Museum , its main building opened on the National Mall near L'Enfant Plaza in 1976.
Episodes of vasovagal syncope are typically recurrent and usually occur when the predisposed person is exposed to a specific trigger. Before losing consciousness, the individual frequently experiences early signs or symptoms such as lightheadedness, nausea, the feeling of being extremely hot or cold (accompanied by sweating), ringing in the ears, an uncomfortable feeling in the heart, fuzzy ...
The classic symptoms include a slow heart rate due to loss of cardiac sympathetic tone and warm skin due to dilation of the peripheral blood vessels. [20] (This term can be confused with spinal shock which is a recoverable loss of function of the spinal cord after injury and does not refer to the hemodynamic instability.)
"With flying colours" ("with flying colors" in American English) is a popular idiom of the English language that is used to describe how well someone has completed a task. For example, a common use of the phrase is to refer to someone having passed a test or other examination " with flying colours ," i.e. passed the test easily or with an ...