The Hypertonic Infant is a definite clinical entity. It is characterized by hypertonicity of all the skeletal muscles, as shown by the ability to raise the head and grasp objects even in the early days of life, and by general spasticity. The hollow viscera show increased activity of their smooth muscle fibers. This expresses itself in the form of spasm involving practically every part of the digestive tube, and, depending on the region, presents the symptom of colic, visible peristalsis, vomiting, constipation, or any combination of these. Accompanying these symptoms is marked psychic irritability, expressed by insomnia, general restlessness and crying. The hypertonic infant belongs to the spasmophilic group and presents the symptoms of Vagotonia.1
Its recognition is of importance in this, that while presenting symptoms in the main of disturbances of nutrition, food regulation alone does not correct the fault, whereas treatment by the drug atropin is followed
HAAS SV. THE HYPERTONIC INFANT, THE CURATIVE ACTION OF ATROPIN ON CERTAIN OF ITS MANIFESTATIONS. Am J Dis Child. 1918;XV(5):323–335. doi:10.1001/archpedi.1918.04110230012002
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