ArticleRespiratory physiology & neurobiology2014
Breathing and temperature control disrupted by morphine and stabilized by clonidine in neonatal rats.
Article in Respiratory physiology & neurobiology, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Acute buprenorphine exposure depresses neonatal respiratory chemoreflexes in the presence or absence of naloxone.bioRxiv : the preprint server for biology · 2026Article
- Cardiorespiratory failure and sudden death induced by carfentanil exposure: Involvement of central mu1 opioid receptors.Toxicology and applied pharmacology · 2025Article
- Clonidine for sedation in infants during therapeutic hypothermia with neonatal encephalopathy: pilot study.Journal of perinatology : official journal of the California Perinatal Association · 2022Article
- Article
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7 authors.
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Abstract
backgroundSedative-analgesics are often given to newborn infants and are known to affect many components of the autonomic nervous system. While morphine is most frequently used, α-2 adrenergic receptor agonists are being increasingly used in this population. Alpha-2 adrenergic receptors agonists also have anti-shivering properties which may make it a desirable drug to give to infants undergoing therapeutic hypothermia. The aim of this study was to systematically compare two different classes of sedative-analgesics, morphine, a μ-opioid receptor agonist, and clonidine an α-2 adrenergic receptor agonist on breathing, metabolism and core body temperature (CBT) in neonatal rodents.
methodsBreathing parameters, oxygen consumption (VO2) and carbon dioxide production (VCO2), were measured prior to, 10 and 90 min after intraperitoneal (IP) administration of morphine (2, 10 or 20 mg/kg), clonidine (40, 200 or 400 μg/kg), or saline in Sprague-Dawley rat pups at postnatal day 7 (p7) while continuously monitoring CBT.
resultsMorphine reduced the respiratory rate, VO2 and VCO2 greater than clonidine at all dosages used (p<0.05, morphine vs. clonidine, for all metabolic and respiratory parameters). Furthermore, morphine induced prolonged respiratory pauses, which were not observed in animals treated with clonidine or saline. Morphine caused hypothermia which was dose dependent, while clonidine stabilized CBT in comparison to saline treated animals (p<0.0001).
conclusionIn the newborn rat, morphine causes profound respiratory depression and hypothermia while clonidine causes minimal respiratory depression and stabilizes CBT. All together, we suggest that clonidine promotes autonomic stability and may be a desirable agent to use in infants being treated with therapeutic hypothermia.
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