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  • Clinical Research Article
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Novel metrics to characterize temporal lobe of very preterm infants on term-equivalent brain MRI

Abstract

Background

Preterm birth adversely impacts brain development and contributes to neurodevelopmental impairment; the temporal lobe may be particularly vulnerable to the impact of very preterm (VP) birth. Yet, no prior magnetic resonance imaging (MRI) scoring system incorporated a method to quantify temporal lobe size in VP infants.

Methods

We developed and applied three metrics (temporal lobe length, extra-axial space, and temporal horn width) to quantify temporal lobe structure on term-equivalent brain MRIs obtained from 74 VP and 16 term infants. We compared metrics between VP and term infants and explored associations of each metric with perinatal risk factors.

Results

All metrics had excellent reliability (intra-class correlation coefficient 0.62–0.98). VP infants had lower mean temporal lobe length (76.8 mm versus 79.2 mm, p = 0.02); however, the difference attenuated after correction for postmenstrual age. VP infants had larger temporal horn widths compared with term infants (2.6 mm versus 1.8 mm, p < 0.001). Temporal lobe length was positively associated with gestational age, birth weight, and male sex, and negatively associated with the duration of parenteral nutrition.

Conclusions

The proposed metrics are reliable and sensitive in distinguishing differences in temporal lobe development between VP and full-term infants.

Impact

  • We developed a novel method for quantifying temporal lobe size among very preterm infants at term equivalent using simple metrics performed on brain MRI.

  • Temporal lobe metrics were reliable, correlated with brain volume from volumetric analysis, and were sensitive in identifying differences in temporal lobe development among preterm compared with term infants, specifically larger temporal horn size in preterm infants.

  • This temporal lobe metric system will enable future work to delineate the perinatal and postnatal factors that impact temporal lobe growth, and better understand the relationship between temporal lobe disturbance and neurodevelopment in very preterm infants.

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Fig. 1: Temporal lobe metrics on term-equivalent MRI scan of a VP infant.
Fig. 2: Population pyramid histograms for metrics of very preterm (gray bars, on left) and term (black bars, on right) infants.

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Data availability

The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We thank the infants and their families who participated in this study.

Funding

Portions of this study were supported by a Marshall Klaus Perinatal Research Award from the American Academy of Pediatrics (KAB); Brigham and Women’s Hospital Department of Pediatric Newborn Medicine and Stork Fund, and the Brigham Research Institute Fund to Sustain Research Excellence (MBB); and the Harvard Clinical and Translational Science Center (National Center for Advancing Translational Science, grants 1UL1TR001102 and 1UL1TR002541-01). The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Center for Research Resources or the National Institutes of Health.

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Authors

Contributions

C.E. and T.E.I. conceptualized the study; T.E. and M.B.B. contributed to data acquisition; C.E., K.A.B., A.G., and C.B. analyzed the data; all authors contributed to data interpretation; C.E., K.A.B., A.A.G., and C.B. wrote the initial manuscript draft; all authors provided critical review and editing of the manuscript and approved the final draft.

Corresponding author

Correspondence to Carmina Erdei.

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The authors declare no competing interests.

Ethics approval and consent to participate

The parents of all infants participating in this study provided written informed consent to undergo brain magnetic resonance imaging for research purposes, under protocols approved by the Mass General Brigham Institutional Review Board.

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Erdei, C., Bell, K.A., Garvey, A.A. et al. Novel metrics to characterize temporal lobe of very preterm infants on term-equivalent brain MRI. Pediatr Res 94, 979–986 (2023). https://doi.org/10.1038/s41390-023-02567-5

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