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A Novel Method for Measurement of Cardiovascular Responses to Lower Body Negative Pressure in the Awake Instrumented Rat.
Am J Physiol Heart Circ Physiol
January 2025
Department of Pharmacology, Physiology and Neurobiology, University of Cincinnati College of Medicine, Cincinnati, OH.
Lower body negative pressure (LBNP) has been used for decades in humans to model arterial baroreceptor unloading and represents a powerful tool for evaluating cardiovascular responses to orthostatic challenge. However, LBNP studies in animals have been limited to conditions of anesthesia or sedation, where cardiovascular reflexes are altered. Given the consequent uncertainties, the usefulness of LBNP studies in these preclinical models has been severely hampered.
View Article and Find Full Text PDFSuccessful thoracoscopic-assisted resection of a functional paraganglioma in the mediastinum with extracorporeal circulation: a case report.
J Cardiothorac Surg
January 2025
Department of Thoracic Surgery, The Second Xiangya Hospital of Central South University, Changsha, Hunan, P. R. China.
Background: Paragangliomas are rare neoplasms arising from extra-adrenal chromaffin cells, with mediastinal paragangliomas representing an exceptionally rare subset. This report details the surgical management of a complex mediastinal paraganglioma case, presenting with refractory hypertension and invasion of critical surrounding structures. A comprehensive review of the current literature is included to underscore existing cases, enhance clinical awareness, and share our insights and experience in the diagnosis and treatment of this challenging condition.
View Article and Find Full Text PDFPrenatal dexamethasone programs autonomic dysregulation in female rats.
Am J Physiol Heart Circ Physiol
February 2025
Department of Basic Medical Sciences, University of Arizona College of Medicine, Phoenix, Arizona, United States.
Autonomic dysfunction is associated with cardiovascular and neurological diseases, including hypertension, heart failure, anxiety, and stress-related disorders. Prior studies demonstrated that late gestation exposure to dexamethasone (DEX) resulted in female-biased increases in stress-responsive mean arterial pressure (MAP) and heart rate (HR), suggesting a role for glucocorticoid-mediated programming of autonomic dysfunction. The present study investigated the influence of sympathetic (SYM) or parasympathetic (PS) blockade on cardiovascular function in male and female rat offspring of mothers injected with DEX in utero [ (GD) -].
View Article and Find Full Text PDFSeparate and combined blockades of α- and β-adrenergic receptors in forearm sweating induced by adrenergic agents and exercise in the heat in young adults.
Am J Physiol Regul Integr Comp Physiol
December 2024
Institute of Health and Sport Sciences, University of Tsukuba, Tsukuba City, Japan.
The assessment of adrenergic modulation of sweating as assessed via pharmacologic administration of α- and β-adrenergic receptor blockers during exercise has yielded mixed findings. However, the underlying mechanisms for this disparity remains unresolved. We investigated the effects of separate and combined blockade of α- and β-adrenergic receptors on forearm sweating induced by a 30-min moderate-intensity exercise bout (n=17, protocol 1) and the administration of adrenergic agonists epinephrine and norepinephrine (n=16, protocol 2) in the heat.
View Article and Find Full Text PDFUnexpected pheochromocytoma leading to cardiac arrest during the perioperative period: a case report and literature review.
BMC Anesthesiol
December 2024
Department of Anaesthesiology, The Fourth Affiliated Hospital, School of Medicine, Zhejiang University, Yiwu, Zhejiang, 322000, China.
Background: Pheochromocytomas (PCCs) are rare neuroendocrine catecholamine (CA)-secreting tumours that originate from chromaffin tissue and can produce and store CAs. Unexpected PCCs pose a serious threat to the perioperative safety of patients and a considerable challenge to anaesthesiologists because of the risks of fatal hypertensive crises and other stresses.
Case Presentation: A 37-year-old woman who was scheduled for tonsillectomy and palatopharyngoplasty under general anaesthesia experienced a malignant cardiovascular event after induction, which was characterized mainly by a sharp increase in heart rate and blood pressure, ultimately leading to cardiac arrest and the occurrence of secondary long QT syndrome.
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