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Identifying two distinct subphenotypes of patent ductus arteriosus in preterm infants using machine learning

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Abstract

To use unsupervised machine learning to identify potential subphenotypes of preterm infants with patent ductus arteriosus (PDA). The study was conducted retrospectively at a neonatal intensive care unit in Brazil. Patients with a gestational age < 28 weeks who had undergone at least one echocardiogram within the first two weeks of life and had PDA size > 1.5 or LA/AO ratio > 1.5 were included. Agglomerative hierarchical clustering on principal components was used to divide the data into different clusters based on common characteristics. Two distinct subphenotypes of preterm infants with hemodynamically significant PDA were identified: “inflamed,” characterized by high leukocyte, neutrophil, and neutrophil-to-lymphocyte ratio, and “respiratory acidosis,” characterized by low pH and high pCO2 levels.

    Conclusions: This study suggests that there may be two distinct subphenotypes of preterm infants with hemodynamically significant PDA: “inflamed” and “respiratory acidosis.” By dividing the population into different subgroups based on common characteristics, it is possible to get a more nuanced understanding of the effectiveness of PDA interventions.

What is Known:

• Treatment of PDA in preterm infants has been controversial.

• Stratification of preterm infants with PDA into subgroups is important in order to determine the best treatment.

What is New:

• Unsupervised machine learning was used to identify two subphenotypes of preterm infants with hemodynamically significant PDA.

• The ‘inflamed’ cluster was characterized by higher values of leukocyte, neutrophil, and neutrophil-to-lymphocyte ratio. The ‘respiratory acidosis’ cluster was characterized by lower pH values and higher pCO2 values.

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Availability of data and materials

Data code is available at: https://github.com/fymatsushita/PDA.

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Authors and Affiliations

Authors

Contributions

Dr. Matsushita conceptualized and designed the study, drafted the initial manuscript, conducted all analyses, and reviewed the manuscript. Dr. Krebs conceptualized and designed the study and reviewed the manuscript. Dr. de Carvalho conceptualized and designed the study and reviewed the manuscript. All authors approved the final manuscript as submitted.

Corresponding author

Correspondence to Felipe Yu Matsushita.

Ethics declarations

Ethics approval

The study protocol was reviewed and approved by the institutional ethics committee (Comite de Ética do Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, CAAE 15762719.6.0000.0068) and informed consent was waived.

Competing interests

The authors declare no competing interests.

Additional information

Communicated by Daniele De Luca

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Matsushita, F.Y., Krebs, V.L.J. & de Carvalho, W.B. Identifying two distinct subphenotypes of patent ductus arteriosus in preterm infants using machine learning. Eur J Pediatr 182, 2173–2179 (2023). https://doi.org/10.1007/s00431-023-04882-9

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