AI Article Synopsis
- The administration of serotonin (5-HT) to the pulmonary circulation in cats triggered a sequence of respiratory changes, including temporary cessation of breathing (apnoea) followed by increased breathing rate (tachypnoea).
- Researchers investigated whether injecting 5-HT into the laryngeal artery would produce similar respiratory effects and the role of laryngeal sensory input, particularly the importance of vagal nerve pathways.
- Results indicated that while 5-HT did induce apnoea via laryngeal artery injections, the subsequent respiratory changes were largely unaffected by the laryngeal sensory structure, suggesting that the serotonin chemoreflex originates from within the laryngeal blood supply rather than from sensory feedback.
Article Abstract
Administration of serotonin (5-HT) to pulmonary circulation elicits prompt apnoea, followed by subsequent tachypnoea. The present study was designed to ascertain whether 5-HT challenge into the laryngeal artery will evoke the full constellation of this chemoreflex and to examine the role of laryngeal sensory input and importance of vagal afferents in the respiratory sequelae. The experiments were done on 10 anaesthetized, spontaneously breathing cats. Laryngeal artery injections of 5-HT, similarly to intravenous challenge, caused apnoeas, which were significantly diminished by the section of cervical vagal trunks. Breathing frequency increased in all conditions on intravenous injection but only prior to vagotomy, when administered into laryngeal artery. With resumed breathing, the peak inspiratory airflows were significantly increased in the neurally intact, those treated by bilateral section of the superior laryngeal nerves (SLNs-cut) and vagotomized cats, with no difference between them and independent of the route of injection. The results show that serotonin chemoreflex could evolve from the laryngeal vascular bed and that laryngeal afferents do not contribute to the respiratory arrest.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.55782/ane-1996-1196 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Carotid artery stenosis and ischemic cerebrovascular events after radiotherapy in patients with head and neck cancer.
PLoS One
January 2025
Department of Radiation Oncology, Chulabhorn Hospital, Chulabhorn Royal Academy, Bangkok, Thailand.
Radiotherapy is the main treatment for patients with head and neck cancer (HNC) and is associated with an increased risk of ischemic cerebrovascular events (ICVE). The purpose of this cross-sectional study was to determine the incidence of ICVE and carotid artery stenosis (CAS) in patients with HNC who receive radiotherapy and the risk factors for CAS. We enrolled 907 patients with HNC who underwent radiotherapy between February 2011 and June 2022 and obtained information on their clinical and tumor characteristics and their treatment from the clinical records.
View Article and Find Full Text PDFDelineation of reduced CTV2 on the basis of the characteristics and distribution of cervical lymph node metastasis in nasopharyngeal carcinoma.
BMC Cancer
January 2025
Department of Radiation Oncology, First Affiliated Hospital of Kunming Medical University, 295 Xichang Road, Kunming, 650032, P. R. China.
Introduction: The core objective of this study was to precisely locate metastatic lymph nodes, identify potential areas in nasopharyngeal carcinoma patients that may not require radiotherapy, and propose a hypothesis for reduced target volume radiotherapy on the basis of these findings. Ultimately, we reassessed the differences in dosimetry of organs at risk (OARs) between reduced target volume (reduced CTV2) radiotherapy and standard radiotherapy.
Methods And Materials: A total of 209 patients participated in the study.
Spatio-temporal segregation between sensory relay and swallowing pre-motor population activities by optical imaging in the rat nucleus of the solitary tract.
Pflugers Arch
January 2025
Division of Neurophysiology, Department of Physiology, Hyogo Medical University, Hyogo, 663 8501, Japan.
The nucleus tractus solitarius (NTS) contains neurons that relay sensory swallowing commands information from the oropharyngeal cavity and swallowing premotor neurons of the dorsal swallowing group (DSG). However, the spatio-temporal dynamics of the interplay between the sensory relay and the DSG is not well understood. Here, we employed fluorescence imaging after microinjection of the calcium indicator into the NTS in an arterially perfused brainstem preparation of rat (n = 8) to investigate neuronal population activity in the NTS in response to superior laryngeal nerve (SLN) stimulation.
View Article and Find Full Text PDFEffects of Dexmedetomidine as an Adjuvant in Preoperative Ultrasound-Guided Internal Branch of Superior Laryngeal Nerve Block on Postoperative Sore Throat and Hemodynamics in Patients With Double-Lumen Endotracheal Intubation: A Randomized Controlled Trial.
J Pain Res
January 2025
Department of Anesthesiology, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, 250033, People's Republic of China.
Background: Postoperative sore throat (POST) is a significant adverse effect after endotracheal intubation, especially with double-lumen endotracheal tubes (DLTs). Ultrasound-guided internal branch of the superior laryngeal nerve block (US-guided iSLNB) presents a potential intervention for POST. In this first randomized controlled trial to date, we aimed to investigate the effects of US-guided iSLNB, with or without perineural dexmedetomidine, on the incidence and severity of POST following DLTs.
View Article and Find Full Text PDFMedian effective dose of remimazolam combined with sufentanil for inhibiting laryngeal mask airway insertion responses in children of different ages.
Front Pharmacol
January 2025
Department of Anesthesiology, Shanghai Children's Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China.
Introduction: We determined the median effective dose and 95% confidence interval (CI) of remimazolam required to inhibit laryngeal mask airway (LMA) insertion reactions combined with sufentanil 0.3 μg/kg in pediatric anesthesia.
Methods: Children scheduled to undergo elective laryngeal mask anesthesia were divided into the preschool (age: 3-6 years) and school-age (6-12 years) groups.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!