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Updated: Aug 12, 2026
Assessment and Evaluation of the High Risk Neonate: The NICU Network Neurobehavioral Scale
Published on: August 25, 2014
Insights
This study differentiates cerebral hypotonia from paralytic hypotonia by examining muscle tone and strength. Key diagnostic criteria are provided to distinguish various hypotonia causes in infants.
Area of Science:
- Neurology
- Pediatrics
- Genetics
Background:
- Hypotonia, a condition of decreased muscle tone, presents diagnostic challenges in neonates.
- Differentiating central (cerebral) from peripheral (paralytic) hypotonia is crucial for appropriate management.
- Several conditions can mimic paralytic hypotonia, complicating diagnosis.
Purpose of the Study:
- To discuss cerebral, non-paralytic, and peripheral paralytic hypotonia.
- To emphasize criteria for differential diagnosis of hypotonia.
- To provide practical diagnostic criteria for distinguishing various causes of hypotonia.
Main Methods:
- Review of clinical criteria for differentiating hypotonia types.
- Discussion of specific syndromes associated with severe cerebral hypotonia.
- Outline of diagnostic approaches for peripheral hypotonia.
Main Results:
- Cerebral hypotonia typically preserves muscle strength with decreased tone.
- Severe cerebral hypotonia can resemble paralytic hypotonia in conditions like Prader-Willi syndrome, Zellweger syndrome, and congenital myotonic dystrophy.
- Peripheral hypotonia involves concurrent muscle weakness and hypotonia, with distinct criteria for anterior horn cell disease, polyneuropathy, neonatal myasthenia, and myopathy.
Conclusions:
- Distinguishing between cerebral and peripheral hypotonia relies on assessing muscle strength alongside tone.
- Specific diagnostic criteria aid in identifying the underlying cause of hypotonia.
- Essential or benign hypotonia is a diagnosis of exclusion.
Abstract:
Cerebral, non paralytic and peripheral paralytic hypotonia are briefly discussed. Criteria which help in the differential diagnosis are emphasized. In the usual cerebral hypotonia, muscle strength is preserved but muscle tone is decreased. However, there are a few conditions in which cerebral hypotonia is severe enough to resemble paralytic hypotonia. These conditions include the Prader-Willi syndrome (first phase), the Zellweger syndrome and some cases of congenital myotonic dystrophy. In peripheral or paralytic hypotonia muscle weakness and hypotonia go hand-in-hand. A few practical diagnostic criteria are given which allow the differentiation between anterior horn cell disease, polyneuropathy, neonatal myasthenia and myopathy. Finally, essential or benign hypotonia is briefly alluded to.
