Mintch_Landan_MSBME_Final.pdf (5.54 MB)

Sustained Stimulus Paradigms and Sexual Dimophism of the Aotic Baroreflex in Rat

Download (5.54 MB)
thesis
posted on 10.06.2019, 19:13 by Landan Michael Mintch
The neurophysiological pathways associated with beat-to-beat regulation of mean arterial pressure are well known. Less known are the control dynamics associated with short term maintained of arterial blood pressure about a homeostatic set point.The baroreflex (BRx), the most rapid and robust of neural reflexes within the autonomic nervous system, is a negative feedback controller that monitors and regulates heart rate and blood pressure. By leveraging the parasympathetic and sympathetic divisions of the autonomic nervous system, the BRx can change blood pressure within a single heart beat. To better understand these controller dynamics, a classic BRx reflexogenic experimental preparation was carried out. This thesis reconfirmed previous observations of an electrically-evoked sexually-dimorphic peak depressor response in the BRx of Sprague-Dawley rats and verified that these functional reflexogenic differences carry over to sustained electrical paradigms. Further, it uncovered interesting recovery dynamics in both blood pressure and heart rate. The rat aortic depressor nerve was used as an experimental target for electrical activation of the parasympathetic-mediated reduction in mean arterial pressure. The duration, frequency, and patterning of stimulation were explored, with emphasis on differences between sexes. By measuring the normalized percent decrease in mean arterial pressure as well as the differences in beats per minute during rest and during stimulation,the null hypothesis was rejected.

History

Degree Type

Master of Science in Biomedical Engineering

Department

Biomedical Engineering

Campus location

Indianapolis

Advisor/Supervisor/Committee Chair

John Schild

Advisor/Supervisor/Committee co-chair

Ken Yoshida

Additional Committee Member 2

Michael Mirro

Licence

Exports

Logo branding

Licence

Exports