Catatonic agitation, according to the observations of the outstanding Soviet psychiatrists A.V. Snezhnevsky, O.V. Kerbikov and many other authors, is developing in stages. One type turns into another, more complex one.
The first signs appear as confused pathetic excitement. During this period, the patient performs many very expressive actions, which can be characterized as reactions to external stimuli, and they do not make sense, but the objects are used for their intended purpose. For example, patients open and close doors and windows, but situationally this action is unreasonable; postage stamps are glued, but not on envelopes, but on the wall or on your forehead. At this stage, the patient practically does not close his mouth, his statements are meaningless, torn, enthusiastic and pathetic. Patients often sing or recite poems soulfully, the actions resemble "one-actor theater", which greatly overestimates. At the same time, the patient himself is noticeably confused, as if he cannot remember and understand something. He can inspect and feel objects that fall into his field of vision, throw them or pull them out of the hands of others.
Further, the excitement grows and the symptoms of hebephrenia join it - antics, unmotivated fun, childishness, silly, ridiculous actions, wanton laughter, dancing. Impulsive actions, exaltation are possible. At this stage, the patient is still conscious, but he can already show sudden and intense rage. 
With an increase in symptoms, a period of impulsive actions begins, which are very aggressive in nature, dangerous for the patient himself, since his aggression is often directed at himself. He can grab objects that are nearby, throw them into windows, at standing people, pull objects out of the hands of others, try to run somewhere, hit someone. The patient's speech consists of shouts, he often repeats phrases or individual words after others, their actions, gestures and postures. At this point, the patient is also a serious danger to others. He can start breaking mirrors, glass in windows or doors, grabbing and throwing improvised objects at the surrounding, jump from a high floor, etc. 
Then comes the most difficult phase - mute arousal (the highest degree of impulsivity), when the patient silently and violently performs destructive meaningless actions, fiercely resists verbal and physical attempts to stop him. The rhythmicity of the patient's movements is characteristic, reminiscent of choreic hyperkinesis or the dance of St. Vitus.
Not all psychiatrists agree with this syndrome. Some believe that an impulsive and even dumb stage can come without a prior confused-pathetic phase. Although, perhaps she just passed unnoticed. Catatonic agitation can also end at the first or second stage, especially if the patient is provided with timely medication. It can proceed quite moderately or be very intense, but in any case, the patient does not remain at rest for a second. Periods of arousal at any stage can be replaced by periods of stupor (sub-stupor), when the patient freezes and becomes silent. 
Catatonic agitation is an increase in psychomotor activity with clinical manifestations characteristic of catatonia: echo effects - repetition of words and phrases behind the surrounding (echolalia), facial expressions (echomimia), movements and actions (echopraxia); negativism - providing active or passive resistance to external influences; passive obedience; waxy flexibility (cataleptic manifestations); various stereotypes - motor, speech, etc.
Catatonic excitement can proceed with dimness of consciousness (oneiroid form) or without it (lucid). Hebephrenic, ecstatic excitement can occur in two forms, impulsive and mute - in oneiric.
In the prodrome and the initial stage of catatonic excitement, there are clear symptoms of autonomic disorders - changes in the size of the pupil (alternation of miosis and mydriasis) and skeletal muscle tone, arrhythmia and tachycardia. The pallor of the patient's face is replaced by his sharp redness, sweating - by dry skin. Laboratory tests can show the presence of hyper / hypoglycemia, minor leukocytosis, azotemia, and during wakefulness. There are also jumps in blood pressure. This complex of somatic symptoms is called compensation syndrome.
In the clinical picture of lethal catatonia, the stage of excitement first begins. By itself, catatonic excitement is not classified as malignant catatonia, but it can go into the final stage - stupor. An alarming symptom is hyperthermia and the following manifestations: characterized by a constant and continuous increase in symptoms with an impressive increase in physical capabilities, which leads to destructive consequences, rhythm of movements, logoria. The patient's hands and feet are cold and damp, and the skin on them is cyanotic. Rapidly yellowing bruises appear on the body in places of impacts and pressure. At the moment of excitement, the patient's blood pressure and body temperature increase (up to hyperpyretic values with cold extremities). When the patient becomes weak, and the pressure and temperature begin to decrease, the excitement turns into a stupor. Without treatment, death occurs.  Postmortem examinations do not reveal physiological changes indicating the patient's cause of death. 
Catatonic excitement in children
Psychotic conditions in childhood are most often manifested by speech and motor disorders, similar to catatonic agitation. Children of three to four years old find it difficult to confidently diagnose schizophrenia by identifying delusional ideas or hallucinations in them. Therefore, in most studies it is noted that at an early age, catatonic excitement develops with organic brain damage and exogenous psychosis, as well as with severe oligophrenia. Characterized by such manifestations as stereotypes, rhythmic repetitive movements and shouts, foolishness, echo effects, waxy flexibility, mutism.
Catatonic syndrome in children, especially young children, is most often manifested by agitation. Although there are descriptions of sub-stupor states and stupor, especially in autistic people, when parents note that their children are becoming slower and slower.
At an older age (after 10 years), catatonic excitement in children often precedes rapid degradation and a state of emotional dullness in the development of juvenile malignant schizophrenia. Catatonic disorders are more common in hebephrenia. In their development, they pass in stages a phase of melancholic mood, manic, catatonic excitement, darkened consciousness and the outcome in the final defective phase.
Catatonic excitement in children is most often manifested by impulsive running, aimless movement from one object to another, stereotypical movements, impulsive drives, flight, throwing away or damaging objects. Over time, speech regresses in children and a deep mental defect forms.
In children, catatonic syndrome is rarely observed, so a small number of pediatric patients are usually involved in the samples. The authors note that impulse disorders are observed in the premorbid period, and after 4 years - impoverishment of emotions, monotonous games and catatonic excitement. Akinetic disorders (stupor) are not typical for children. Although the general symptoms in children and adults are practically the same. Small children generally make monotonous repetitive movements: they run in circles, bang their heads on the floor or wall, fiddle with clothes, and bite their nails. In an older age, symptoms of choreic hyperkinesis appear, mannerisms, grimacing, negativism and mutism. 
In general, there is currently not enough information about the catatonic syndrome in children, there are no clear descriptions of the characteristics of speech and motor disorders in the age aspect, that is, they are very ambiguous.