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In children, the most common cause is a stroke of the ventral pons. [9]Unlike persistent vegetative state, in which the upper portions of the brain are damaged and the lower portions are spared, locked-in syndrome is essentially the opposite, caused by damage to specific portions of the lower brain and brainstem, with no damage to the upper brain.
One of the unique characteristics of AHC is that hemiplegic attacks, as well as other symptoms which may co-occur with hemiplegia, cease immediately upon sleep. During strong attacks, the symptoms may reoccur upon waking. [4] [6] Hemiplegic attacks can occur suddenly or gradually, and the severity of an attack can vary over its duration. [6]
The American Brain Foundation estimates that about 30% of people will still experience some weakness after three years from their initial diagnosis, and 15% have long-term weakness.
Poliomyelitis (/ ˌ p oʊ l i oʊ ˌ m aɪ ə ˈ l aɪ t ɪ s / POH-lee-oh-MY-ə-LY-tiss), commonly shortened to polio, is an infectious disease caused by the poliovirus. [1] Approximately 75% of cases are asymptomatic; [5] mild symptoms which can occur include sore throat and fever; in a proportion of cases more severe symptoms develop such as headache, neck stiffness, and paresthesia.
The preclinical or asymptomatic phase, also called the incubation period, averages 10–13 years, but can be as short as five and has been estimated to last as long as 50 years or more after initial exposure. [13] The clinical stage, which begins at the first onset of symptoms, lasts an average of 12 months.
In 2018, the last year EV-D68 was documented in relatively high levels, the median age of children needing care in emergency rooms or hospitals was about 3. "However, all ages of children and ...
Rates of enterovirus D68 infections are rising, and the virus could lead to a rare polio-like condition in children. Dr. Leana Wen tells parents what they need to know.
Second-impact syndrome (SIS) occurs when the brain swells rapidly, and catastrophically, after a person has a second concussion before symptoms from an earlier one have subsided. This second blow may occur minutes, days, or weeks after an initial concussion, [1] and even the mildest grade of concussion can lead to second impact syndrome. [2]