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Shock front: The boundary over which the physical conditions undergo an abrupt change because of a shock wave. Contact front: In a shock wave caused by a driver gas (for example the "impact" of a high explosive on the surrounding air), the boundary between the driver (explosive products) and the driven (air) gases.
A concussion, also known as a mild traumatic brain injury (mTBI), is a head injury that temporarily affects brain functioning. [8] Symptoms may include headache, dizziness, difficulty with thinking and concentration, sleep disturbances, mood changes, a brief period of memory loss, brief loss of consciousness; problems with balance; nausea; blurred vision; and mood changes.
Blast waves cause damage by a combination of the significant compression of the air in front of the wave (forming a shock front) and the subsequent wind that follows. [15] A blast wave travels faster than the speed of sound, and the passage of the shock wave usually lasts only a few milliseconds. Like other types of explosions, a blast wave can ...
The word “concussion” may bring to mind football players and other athletes. Or maybe someone who’s been in a bad car wreck. But the truth is that a concussion isn’t always the result of a ...
Primary injuries are caused by blast overpressure waves, or shock waves. Total body disruption is the most severe and invariably fatal primary injury. [2] Primary injuries are especially likely when a person is close to an exploding munition, such as a land mine. [3]
British authorities banned the term shell shock during World War II to avoid an epidemic of cases, and the term posttrauma concussion state was coined in 1939 to describe "disturbance of consciousness with no immediate or obvious pathologic change in the brain". [73] The term postconcussion syndrome was in use by 1941. [73]
The treatment of chronic shell shock varied widely according to the details of the symptoms, the views of the doctors involved, and other factors including the rank and class of the patient. There were so many officers and men with shell shock that 19 British military hospitals were wholly devoted to the treatment of cases.
It may be more reliable for determining severity of concussion than GCS because the latter may not be sensitive enough; individuals with s concussion often quickly regain a GCS score of 15. [3] Longer periods of amnesia or loss of consciousness immediately after the injury may indicate longer recovery times from residual symptoms from ...