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Reflexes that impact spontaneous breathing of preterm infants at birth: a narrative review
  1. Kristel Kuypers1,
  2. Tessa Martherus1,
  3. Tereza Lamberska2,
  4. Janneke Dekker3,4,
  5. Stuart B Hooper3,4,
  6. Arjan B te Pas1
  1. 1Neonatology, Leiden University Medical Center, Leiden, The Netherlands
  2. 2Neonatology, General University Hospital in Prague, Prague, Czech Republic
  3. 3The Ritchie Centre, Hudson Institute of Medical Research, Clayton, Victoria, Australia
  4. 4Obstetrics and Gynaecology, Monash University, Clayton, Victoria, Australia
  1. Correspondence to Kristel Kuypers, Neonatology, Leiden University Medical Center, Leiden 2333 ZA, The Netherlands; k.l.a.m.kuypers{at}lumc.nl

Abstract

Some neural circuits within infants are not fully developed at birth, especially in preterm infants. Therefore, it is unclear whether reflexes that affect breathing may or may not be activated during the neonatal stabilisation at birth. Both sensory reflexes (eg, tactile stimulation) and non-invasive ventilation (NIV) can promote spontaneous breathing at birth, but the application of NIV can also compromise breathing by inducing facial reflexes that inhibit spontaneous breathing. Applying an interface could provoke the trigeminocardiac reflex (TCR) by stimulating the trigeminal nerve resulting in apnoea and a reduction in heart rate. Similarly, airflow within the nasopharynx can elicit the TCR and/or laryngeal chemoreflex (LCR), resulting in glottal closure and ineffective ventilation, whereas providing pressure via inflations could stimulate multiple receptors that affect breathing. Stimulating the fast adapting pulmonary receptors may activate Head’s paradoxical reflex to stimulate spontaneous breathing. In contrast, stimulating the slow adapting pulmonary receptors or laryngeal receptors could induce the Hering-Breuer inflation reflex or LCR, respectively, and thereby inhibit spontaneous breathing. As clinicians are most often unaware that starting primary care might affect the breathing they intend to support, this narrative review summarises the currently available evidence on (vagally mediated) reflexes that might promote or inhibit spontaneous breathing at birth.

  • neonatology
  • neurology
  • resuscitation
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Footnotes

  • Contributors KK performed the literature search, data collection and interpretation, writing and submitting of the manuscript. TM, TL, JD and SH were involved in data interpretation and critically reviewing the manuscript. ABtP designed the structure of the review and helped with data interpretation, writing and editing of the manuscript. No honorarium, grant or other form of payment was given to anyone to produce the manuscript.

  • Funding This study was funded by Nederlandse Organisatie voor Wetenschappelijk Onderzoek.

  • Competing interests None declared.

  • Patient consent for publication Not required.

  • Provenance and peer review Not commissioned; externally peer reviewed.

  • Data availability statement Data sharing not applicable as no datasets generated and/or analysed for this study.

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