Hypotonia


Also found in: Dictionary, Thesaurus, Medical, Wikipedia.

hypotonia

[‚hī·pə′tō·nē·ə]
(medicine)
Decrease of normal tonicity or tension, especially diminution of intraocular pressure or of muscle tone.

Hypotonia

 

(hypotension), the lowering of tone (tension) of a tissue, organ, or system. The term “hypotonia” is most often used to denote a lowering of blood pressure below 105/65 mm Hg (14/8.7 kilonewtons per sq m) for men and 96/60 mm Hg (13.2/8 kilonewtons per sq m) for women, as a result of the lowering of the tone of the cardiovascular system. There are several forms of vascular hypotonia.

The physiological or adaptive form of hypotonia is found in many people, including those in physical training, athletes, and inhabitants of southern regions. The drop in arterial pressure is not accompanied by any symptoms of disease and is completely compensated for by the hemodynamic processes. Special treatment is not needed. Symptomatic hypotonia is one of the symptoms of a number of diseases, including many infectious diseases, tuberculosis, tumors, and some heart ailments. Treatment is directed at the removal of the basic disease. Primary or neurocirculatory hypotonia develops as an independent pathological process resulting from harmful effects on the neurohumoral system, which regulates vascular tone. (Among the factors that may adversely affect the neurohumoral system are negative emotions, strain on the nervous system as a result of mental overexertion, harmful habits, such as smoking and drinking, and certain occupational hazards.) Primary hypotonia may arise suddenly and is manifested by collapse, syncope, and shock. Chronic primary hypotonia is characterized by headaches, dizziness, decreased ability to adapt to changes in body position, poor sleep, and palpitations. When the process progresses, hypotonic disease develops. Treatment involves possible removal of the cause of the hypotonia, a strict regimen of work, rest, and diet, gymnastic and physiotherapeutic treatments, drug therapy, and treatment in a sanatorium or health resort.

REFERENCES

Molchanov, N. S. Gipotonicheskie sostoianiia. Leningrad, 1962.(Bibliography.)

N. S. MOLCHANOV

References in periodicals archive ?
XGS is a newly described disorder characterised by developmental delay, hypotonia, speech delay, sleep apnoea, and seizures.
History of Sibling with###Twins, one had hypotonia and###One sibling died with###Death of a sibling on D7OL###One sibling
Among the minor anomalies, low set ears, epicanthic folds, simian crease and hypotonia were found to have a statistically significant association with the occurrence of chromosomal anomalies.
Feeding difficulties and hypotonia at birth were present in all these patients, with NGFs given to nine.
The central nervous system symptoms of this syndrome are hypotonia, sensorineural hearing loss and corpus callosum dysgenesis or agenesis (1,4,7).
Hypotonia and mental retardation are more common in SGS, but they are rare in LDS and MFS.
In the present case, some findings, especially disorders of sex development, hypertelorism, small nose and mouth, long philtrum, micrognathia, widely spaced nipples and severe hypotonia, were compatible with 9p deletion syndrome.
Although hypotonia, hypothermia, feeding difficulties, seizures, dysmorphic facial features, and cognitive and motor retardation are major clinical findings of MD, they are not specific.
She had severe hypotonia, head lag, and hypertonicity in the extremities and would not interact socially.
We leaned towards ontological pluralism, with the realisation that multiple perspectives about complex phenomena can be true, which in this case was the approach to the clinical assessment of hypotonia in children.