Early Motor Repertoire of Very Preterm Infants and Relationships with 2-Year Neurodevelopment

Amanda K-L Kwong1,2,3, Roslyn N Boyd1,4, Mark D Chatfield1,4

  • 1Queensland Cerebral Palsy and Rehabilitation Research Centre, Child Health Research Centre, Faculty of Medicine, The University of Queensland, Brisbane, QLD 4101, Australia.

Insights

The revised Motor Optimality Score (MOS-R) effectively predicts neurodevelopmental outcomes in very preterm infants. This assessment tool shows strong relationships with cerebral palsy and motor/cognitive delays at two years corrected age.

Area of Science:

  • Neonatal Neurology
  • Developmental Pediatrics
  • Neurodevelopmental Assessment

Background:

  • Preterm infants (<31 weeks’ gestational age) face significant neurodevelopmental risks.
  • Early identification of neurodevelopmental impairments is crucial for timely intervention.
  • The Motor Optimality Score, revised (MOS-R) is an extension of the Prechtl General Movements Assessment, offering potential for early prediction.

Purpose of the Study:

  • To determine the relationship between the MOS-R and 2-year neurodevelopmental outcomes in very preterm infants.
  • To examine the predictive validity of the MOS-R at 3–4 months’ corrected age (CA) for neurodevelopmental outcomes.
  • To assess MOS-R's predictive power beyond established perinatal risk factors, including Prechtl fidgety movements.

Main Methods:

  • A cohort of 169 infants born very preterm (<31 weeks’ gestational age) was studied.
  • The MOS-R was administered at 3–4 months’ corrected age (CA).
  • Neurodevelopmental outcomes at 2 years’ CA were assessed using the Bayley Scales of Infant and Toddler Development, Third edition (Bayley-III) and the Neurological, Sensory, Motor, Developmental Assessment (NSMDA). Cerebral palsy (CP) was classified at 2 years.

Main Results:

  • The MOS-R demonstrated significant relationships with 2-year neurodevelopmental outcomes, including Bayley-III motor and cognitive scores, and NSMDA scores.
  • Each 1-point increase in MOS-R was associated with reduced odds of definite and clinical cerebral palsy.
  • A MOS-R score ≤ 23 effectively predicted motor impairment (sensitivity 78%) and neurosensory motor impairment (sensitivity 86%) at 2 years.

Conclusions:

  • The MOS-R is strongly associated with cerebral palsy and motor/cognitive delays at 2 years in very preterm infants.
  • The MOS-R serves as a valuable predictor of motor and neurosensory motor impairment in this high-risk population.
  • The MOS-R provides a reliable tool for early neurodevelopmental assessment in very preterm infants.

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