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Progressive Increase in Renal Sympathetic Nerve Activity Induced by Cold Exposure.
Hypertension
January 2025
Department of Environmental Health, Life Science and Human Technology, Nara Women's University, Japan.
Background: Exposure to cold environments is linked to cold-induced hypertension due to activated sympathetic nerve activity (SNA) and arterial baroreceptor reflex dysfunction. However, direct measurement of SNA during cold-induced hypertension and changes in baroreflex control of SNA remain unexplored.
Methods: Chronically instrumented rats were exposed to cold temperatures (10 °C) over 4 days after a control period (24 °C), and renal and lumbar sympathetic nerve activities were simultaneously measured during cold-induced hypertension.
Emergency medicine updates: Sympathetic crashing acute pulmonary edema.
Am J Emerg Med
January 2025
Department of Emergency Medicine, Rush University Medical Center, Chicago, IL, USA.
Introduction: Patients with heart failure exacerbation can present in a variety of ways, including sympathetic crashing acute pulmonary edema (SCAPE). Emergency physicians play a key role in the diagnosis and management of this condition.
Objective: This narrative review evaluates key evidence-based updates concerning the diagnosis and management of SCAPE for the emergency clinician.
The Paradise Renal Denervation System: An FDA-approved catheter-based treatment option for resistant hypertension.
Cardiol Rev
October 2024
From the Department of Medicine, New York Medical College, Valhalla, NY.
Resistant hypertension is defined as office blood pressure >140/90 mm Hg with a mean 24-hour ambulatory blood pressure of >130/80 mm Hg in patients who are compliant with 3 or more antihypertensive medications. Those who persistently fail pharmaceutical therapy may benefit from interventional treatment, such as renal denervation. Sympathetic nervous activity in the kidney is a known contributor to increased blood pressure because it results in efferent and afferent arteriole vasoconstriction, reduced renal blood flow, increased sodium and water reabsorption, and the release of renin.
View Article and Find Full Text PDFMethod for measuring cervical vagal nerve activity in conscious rats.
Am J Physiol Endocrinol Metab
January 2025
Autonomic Physiology Laboratory, Faculty of Life Science and Human Technology, Nara Women's University, Kita-Uoya Nishimachi, Nara, 630-8506, Japan.
The current study aimed to propose a method to directly measure right cervical vagal nerve activity (cVNA) alongside renal sympathetic nerve activity (RSNA) in conscious rats. The right cervical vagus nerve was surgically exposed and fitted with a bipolar electrode to record cVNA. A microcatheter was used to administer levobupivacaine to selectively block afferent cVNA.
View Article and Find Full Text PDFThe role of the dorsomedial hypothalamus in the cardiogenic sympathetic reflex in the Sprague Dawley rat.
Front Physiol
December 2024
Biomedical Science Department, Quillen College of Medicine, East Tennessee State University, Johnson City, TN, United States.
Myocardial ischemia causes the production and release of metabolites such as bradykinin, which stimulates cardiac spinal sensory afferents, causing chest pain and an increase in sympathetic activity referred to as the cardiogenic sympathetic afferent reflex. While the brain stem nuclei, such as the nucleus tractus solitarius and rostral ventrolateral medulla, are essential in the cardiogenic sympathetic afferent reflex, the role of other supramedullary nuclei in the cardiogenic sympathetic afferent reflex are not clear. The dorsomedial hypothalamic nucleus (DMH) is involved in cardiovascular sympathetic regulation and plays an important role in the sympathetic response to stressful stimuli.
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