The floppy infant: contribution of genetic and metabolic disorders

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Asuri N Prasad1, Chitra Prasad

  • 1Section of Pediatric Neurosciences, Department of Pediatrics and Child Health, Faculty of Medicine, University of Manitoba, Manitoba, Canada. aprasad@hsc.mb.ca

Brain & Development
|September 18, 2003
PubMed

Insights

Floppy infant syndrome, characterized by infant hypotonia, has complex diagnoses. Advances in genetics enable rapid molecular diagnosis for conditions like spinal muscular atrophy (SMA) and congenital muscular dystrophies (CMD).

Area of Science:

  • Pediatric Neurology
  • Clinical Genetics
  • Developmental Neuroscience

Background:

  • Floppy infant syndrome presents as generalized hypotonia in newborns, often requiring complex, multidisciplinary diagnostic workups.
  • Recent advancements in genetics and neurosciences have identified new congenital myopathies and enabled rapid molecular diagnostics.

Purpose of the Study:

  • To review advances in understanding the genetic and metabolic basis of neurological disorders causing floppy infant syndrome.
  • To outline an updated investigative workup for infants presenting with hypotonia.

Main Methods:

  • Literature review focusing on genetic and neuroscientific advancements in diagnosing hypotonia.
  • Development of a systematic evaluation algorithm for floppy infants.

Main Results:

  • Molecular diagnostics are now available for conditions including spinal muscular atrophy (SMA), congenital muscular dystrophies (CMD), and congenital myotonic dystrophy.
  • The review highlights the increasing role of genetic testing in identifying the etiology of neonatal hypotonia.

Conclusions:

  • Early and accurate diagnosis of floppy infant syndrome is crucial for timely intervention.
  • The proposed algorithm aids pediatricians and neonatologists in systematically evaluating infants with hypotonia, integrating recent diagnostic advances.

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