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Is Aberrant Reno-Renal Reflex Control of Blood Pressure a Contributor to Chronic Intermittent Hypoxia-Induced Hypertension?
This study demonstrated unaltered vascular conductance in response to lumbar sympathetic stimulation in CIH-exposed rats. Aortic compliance was increased and estimated blood volume was unchanged in CIH-exposed rats. Increased blood pressure was related to an increase in cardiac output, which was confirmed by echocardiography (Lucking et al., 2014). It is suggested therefore that hypertension in the CIH model can be evoked by over-excitation of the cardiac arm of sympathetic nervous system (SNS), even before mechanisms of enhanced peripheral vasoconstriction and endothelial dysfunction are initiated (Naghshin et al., 2009)....
Source: Frontiers in Physiology - April 23, 2019 Category: Physiology Source Type: research

ALM Fluid Therapy Shifts Sympathetic Hyperactivity to Parasympathetic Dominance in the Rat Model of Non-Compressible Hemorrhagic Shock
Excessive sympathetic outflow following trauma can lead to cardiac dysfunction, inflammation, coagulopathy, and poor outcomes. We previously reported that buprenorphine analgesia decreased survival after hemorrhagic trauma. Our aim is to examine the underlying mechanisms of mortality in a non-compressible hemorrhage rat model resuscitated with saline or adenosine, lidocaine, magnesium (ALM). Anesthetized adult male Sprague-Dawley rats were randomly assigned to Saline control group or ALM therapy group (both n = 10). Hemorrhage was induced by 50% liver resection. After 15 min, 0.7 mL/kg 3% NaCl ± ALM intravenou...
Source: Shock - January 21, 2022 Category: Emergency Medicine Tags: Basic Science Aspects Source Type: research

Sympathetic nervous system hyperactivity results in potent cerebral hypoperfusion in swine
CONCLUSION: In swine, SCG stimulation resulted in significant cerebral perfusion deficit, and this was inhibited by prior local anesthetic injection into the SCG. Inhibiting sympathetic activation by targeting the SCG may be an effective treatment for sympathetic mediated cerebral hypoperfusion.PMID:35567916 | DOI:10.1016/j.autneu.2022.102987
Source: Autonomic Neuroscience - May 14, 2022 Category: Neuroscience Authors: Wi Jin Kim Michael Dacey Hashitha Milan Samarage David Zarrin Keshav Goel Christopher Chan Xin Qi Anthony C Wang Kalyanam Shivkumar Jeffrey Ardell Geoffrey P Colby Source Type: research

O-038 Sympathetic nervous system activation causes cerebral perfusion deficit and cerebral vasoconstriction in Swine
ConclusionIn swine, electrical stimulation of SCG results in reproducible cerebral vasoconstriction and perfusion deficit comparable to cerebral vasospasm. This can be inhibited by prior local anesthetic injection into the SCG, a possible therapeutic target for cerebral vasospasm.Abstract O-038 Figure 1CT perfusion scan (top row) coronel view of approximate fronto-temporal area of swine brain (outlined in white box) at baseline, with right SCG stimulation, with lidocainc + right SCG stimulation. Cerebral angiogram (bottom row) AP view of swine cranial artcrics at baseline, with right SCG stimulation, with lidocaine + right...
Source: Journal of NeuroInterventional Surgery - July 23, 2022 Category: Neurosurgery Authors: Kim, W., Samarage, M., Zarrin, D., Goel, K., Johnson, J., Wang, A., Colby, G. Tags: SNIS 19th annual meeting oral abstracts Source Type: research