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The three main signs of hyperekplexia are generalized stiffness, excessive startle response beginning at birth, and nocturnal myoclonus. [5] Affected individuals are fully conscious during episodes of stiffness, which consist of forced closure of the eyes and an extension of the extremities followed by a period of generalised stiffness and uncontrolled falling at times. [6]
Usually the onset of the startle response is a startle reflex reaction. The startle reflex is a brainstem reflectory reaction (reflex) that serves to protect vulnerable parts, such as the back of the neck (whole-body startle) and the eyes (eyeblink) and facilitates escape from sudden stimuli. It is found across many different species ...
The third symptom cluster, increased arousal, produces anxiety-driven responses, such as trouble sleeping, excessive anger and irritability, hypervigilance, poor concentration, and exaggerated startle response. When these symptoms persist for more than 2 weeks, a diagnosis of acute stress disorder may be appropriate. [5]
Emotional arousal symptoms include sleep disturbances, hypervigilance, difficulties with concentration, more common startle response, and irritability. [4] Symptom presentation must last for at least three consecutive days after trauma exposure to be classified as acute stress disorder.
The muscle jerks consist of symmetric, mostly generalized jerks, localized in the arms and in the shoulders and also simultaneously with a head nod; both the arms may fling out together and simultaneously a head nod may occur. Symptoms have some variability amongst subjects. Sometimes the entire body may jerk, just like a startle response. As ...
Symptoms within this classification include the startle response and reticular reflex myoclonus. Sudden stimuli like noise or touch to areas around the head or chest cause the startle response which will go up the brain stem and down the spinal cord causing jerk-like movements.
It is not fear but exposure that causes moral injury – an experience or set of experiences that can provoke mild or intense grief, shame and guilt. The symptoms are similar to PTSD: depression and anxiety, difficulty paying attention, an unwillingness to trust anyone except fellow combat veterans.
A hypnic jerk, hypnagogic jerk, sleep start, sleep twitch, myoclonic jerk, or night start is a brief and sudden involuntary contraction of the muscles of the body which occurs when a person is beginning to fall asleep, often causing the person to jump and awaken suddenly for a moment.