Effects of vagal denervation on cerebral blood flow regulation immediately after the onset of ventricular pacing in anesthetized rats
Abstract Cerebral blood flow (CBF) appears to be selectively distributed in vital brain regions during rapid severe hypotension caused by tachyarrhythmia. To examine the effect of cardiopulmonary vagal afferent signals on region-specific CBF regulation, we compared CBF responses 1–4 s from the onset...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Nature Portfolio
2025-07-01
|
| Series: | Scientific Reports |
| Subjects: | |
| Online Access: | https://doi.org/10.1038/s41598-025-05406-1 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849335143469154304 |
|---|---|
| author | Kei Ishii Hidehiko Komine Takeyuki Oba |
| author_facet | Kei Ishii Hidehiko Komine Takeyuki Oba |
| author_sort | Kei Ishii |
| collection | DOAJ |
| description | Abstract Cerebral blood flow (CBF) appears to be selectively distributed in vital brain regions during rapid severe hypotension caused by tachyarrhythmia. To examine the effect of cardiopulmonary vagal afferent signals on region-specific CBF regulation, we compared CBF responses 1–4 s from the onset of ventricular pacing (at 550–850 beats/min) between vagotomized and sham-operated anesthetized male Wistar rats. Laser Doppler flowmetry was used to measure CBF in nine different brain regions from the cortex to the pons. The effects of vagotomy on cerebrovascular responsiveness to 5% CO2 exposure were also examined. Vagotomized rats showed an increased baseline heart rate and a diminished decrease in mean arterial pressure (MAP) during ventricular pacing compared with the sham-operated rats. In all the brain regions, CBF responses to pacing-induced moderate (− 34 mmHg ≤ ΔMAP ≤ − 15 mmHg) and severe hypotension (− 54 mmHg ≤ ΔMAP ≤ − 35 mmHg) were comparable between the groups. Vagotomy had no effect on the cerebrovascular response time or reactivity to hypercapnia. The present findings suggest that cardiopulmonary vagal afferent signals are not essential for cerebrovascular counterregulation immediately after the onset of ventricular tachycardia. |
| format | Article |
| id | doaj-art-4e1845d490b74192a1df9de4abbec9be |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj-art-4e1845d490b74192a1df9de4abbec9be2025-08-20T03:45:23ZengNature PortfolioScientific Reports2045-23222025-07-0115111210.1038/s41598-025-05406-1Effects of vagal denervation on cerebral blood flow regulation immediately after the onset of ventricular pacing in anesthetized ratsKei Ishii0Hidehiko Komine1Takeyuki Oba2Human Informatics and Interaction Research Institute, National Institute of Advanced Industrial Science and TechnologyHuman Informatics and Interaction Research Institute, National Institute of Advanced Industrial Science and TechnologyHuman Informatics and Interaction Research Institute, National Institute of Advanced Industrial Science and TechnologyAbstract Cerebral blood flow (CBF) appears to be selectively distributed in vital brain regions during rapid severe hypotension caused by tachyarrhythmia. To examine the effect of cardiopulmonary vagal afferent signals on region-specific CBF regulation, we compared CBF responses 1–4 s from the onset of ventricular pacing (at 550–850 beats/min) between vagotomized and sham-operated anesthetized male Wistar rats. Laser Doppler flowmetry was used to measure CBF in nine different brain regions from the cortex to the pons. The effects of vagotomy on cerebrovascular responsiveness to 5% CO2 exposure were also examined. Vagotomized rats showed an increased baseline heart rate and a diminished decrease in mean arterial pressure (MAP) during ventricular pacing compared with the sham-operated rats. In all the brain regions, CBF responses to pacing-induced moderate (− 34 mmHg ≤ ΔMAP ≤ − 15 mmHg) and severe hypotension (− 54 mmHg ≤ ΔMAP ≤ − 35 mmHg) were comparable between the groups. Vagotomy had no effect on the cerebrovascular response time or reactivity to hypercapnia. The present findings suggest that cardiopulmonary vagal afferent signals are not essential for cerebrovascular counterregulation immediately after the onset of ventricular tachycardia.https://doi.org/10.1038/s41598-025-05406-1Cerebral blood flowVagotomyCardiopulmonary afferentsVentricular tachycardia |
| spellingShingle | Kei Ishii Hidehiko Komine Takeyuki Oba Effects of vagal denervation on cerebral blood flow regulation immediately after the onset of ventricular pacing in anesthetized rats Scientific Reports Cerebral blood flow Vagotomy Cardiopulmonary afferents Ventricular tachycardia |
| title | Effects of vagal denervation on cerebral blood flow regulation immediately after the onset of ventricular pacing in anesthetized rats |
| title_full | Effects of vagal denervation on cerebral blood flow regulation immediately after the onset of ventricular pacing in anesthetized rats |
| title_fullStr | Effects of vagal denervation on cerebral blood flow regulation immediately after the onset of ventricular pacing in anesthetized rats |
| title_full_unstemmed | Effects of vagal denervation on cerebral blood flow regulation immediately after the onset of ventricular pacing in anesthetized rats |
| title_short | Effects of vagal denervation on cerebral blood flow regulation immediately after the onset of ventricular pacing in anesthetized rats |
| title_sort | effects of vagal denervation on cerebral blood flow regulation immediately after the onset of ventricular pacing in anesthetized rats |
| topic | Cerebral blood flow Vagotomy Cardiopulmonary afferents Ventricular tachycardia |
| url | https://doi.org/10.1038/s41598-025-05406-1 |
| work_keys_str_mv | AT keiishii effectsofvagaldenervationoncerebralbloodflowregulationimmediatelyaftertheonsetofventricularpacinginanesthetizedrats AT hidehikokomine effectsofvagaldenervationoncerebralbloodflowregulationimmediatelyaftertheonsetofventricularpacinginanesthetizedrats AT takeyukioba effectsofvagaldenervationoncerebralbloodflowregulationimmediatelyaftertheonsetofventricularpacinginanesthetizedrats |