Organization of thoracic sympathetic afferent influences on renal nerve activity

Weaver, Lynne C.; Macklem, L. J.; Reimann, Katja; Meckler, R. L.; Oehl, R. S.

doi:10.1152/ajpheart.1979.237.1.h44

Cited by 3 publications

(2 citation statements)

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“…The natriuresis during blood volume expansion has been found to be equal in vagotomized and normal animals (Veress & Pearce 1972). A pulmonary sympathetic afferent pathway responsible for the inhibition of renal nerve activity has been proposed by Weaver et al (1979). In our experiments with moderate volume expansion the renal nerve activity decreased both with intact and with cut vagal nerves, which is in conformance with the results of Veress & Pearce (1972).…”

Section: Discussionsupporting

confidence: 87%

Efferent renal nerve activity during intracarotid and intracerebroventricular infusions of hypertonic sodium chloride solutions and isotonic volume expansion in the rat

A.‐C

Sjöquist

1982

Acta Physiologica Scandinavica

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The change in renal nerve activity under conditions known to increase renal sodium excretion was studied. In adult Sprague Dawley rats, anaesthetized with Inactin, normotonic and hypertonic NaCl solutions were infused into 1) a vein, 2) a carotid artery and 3) the third ventricle. The left kidney was freed and placed in a plastic cup. A renal nerve was dissected free and placed on a stainless bipolar electrode. The nerve was cut distal to the electrode. The nerve signals were amplified and recorded on a tape recorder. Simultaneously integrated nerve signals and also atrial and venous pressures were recorded. Intracarotid infusion of a 1 M NaCl solution increased sodium output and temporarily decreased renal nerve activity by some 35%. Corresponding intravenous (i.v.) infusion gave an increase in renal nerve activity and also in sodium output. The latter increase was delayed compared with that caused by the intracarotid infusion. No variations in blood pressure were noted. In control experiments with a slow i.v. infusion of physiological saline, renal nerve activity increased throughout the experiment, while sodium excretion remained constant. During infusion of a 1 M NaCl solution into the third ventricle, renal nerve activity decreased in about half of the cases. This reduction was often accompanied by an increased arterial blood pressure and an increased sodium output. Arterial blood pressure increases were especially pronounced at the highest infusion rats, i.e. 800 ml-min-1. Isotonic volume expansion of 2% of the body weight resulted in a transient decrease in renal nerve activity by about 30%. Venous blood pressure rose and sodium output increased six-fold. The decrease in nerve activity was observed both when the vagal nerves were intact and when they were cut.

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Section: Discussionsupporting

confidence: 87%

Efferent renal nerve activity during intracarotid and intracerebroventricular infusions of hypertonic sodium chloride solutions and isotonic volume expansion in the rat

A.‐C

Sjöquist

1982

Acta Physiologica Scandinavica

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“…Sympathetic and parasympathetic (vagus) nerves support the complex neural control of the heart: heart rate, dromotropy and inotropy (rapidity and force of ventricular contractility) are governed by innervation of pacemakers (sinoatrial, SA and atrioventricular, AV, nodes) and additional direct autonomic innervation of the ventricular myocardium. Heart rate and contractility are also modified by humoral agents in addition to local, spinal and bulbospinal chemo, baro and nociceptive reflexes ( Weaver et al, 1979; Malliani, 1982; Spyer, 1990; Dampney et al, 2003 ). Medullary parasympathetic (vagus nerve) nuclei couple cardiac function to blood pressure and respiration: the nucleus of the solitary tract (NTS) regulates blood pressure through baroreceptor reflexes while respiratory medullary neurons mediate respiratory sinus arrhythmia ( Jänig, 2006 ).…”

Section: Introductionmentioning

confidence: 99%

Physiological recordings: Basic concepts and implementation during functional magnetic resonance imaging

et al. 2009

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Combining human functional neuroimaging with other forms of psychophysiological measurement, including autonomic monitoring, provides an empirical basis for understanding brain–body interactions. This approach can be applied to characterize unwanted physiological noise, examine the neural control and representation of bodily processes relevant to health and morbidity, and index covert expression of affective and cognitive processes to enhance the interpretation of task-evoked regional brain activity. In recent years, human neuroimaging has been dominated by functional magnetic resonance imaging (fMRI) studies. The spatiotemporal information of fMRI regarding central neural activity is valuably complemented by parallel physiological monitoring, yet such studies still remain in the minority. This review article highlights fMRI studies that employed cardiac, vascular, respiratory, electrodermal, gastrointestinal and pupillary psychophysiological indices to address specific questions regarding interaction between brain and bodily state in the context of experience, cognition, emotion and behaviour. Physiological monitoring within the fMRI environment presents specific technical issues, most importantly related to safety. Mechanical and electrical hazards may present dangers to scanned subjects, operator and/or equipment. Furthermore, physiological monitoring may interfere with the quality of neuroimaging data, or itself be compromised by artefacts induced by the operation of the scanner. We review the sources of these potential problems and the current approaches and advice to enable the combination of fMRI and physiological monitoring in a safe and effective manner.

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Cardiac sympathetic afferent influences on renal nerve activity

Weaver

1981

Journal of the Autonomic Nervous System

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Organization of thoracic sympathetic afferent influences on renal nerve activity

Cited by 3 publications

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Efferent renal nerve activity during intracarotid and intracerebroventricular infusions of hypertonic sodium chloride solutions and isotonic volume expansion in the rat

Efferent renal nerve activity during intracarotid and intracerebroventricular infusions of hypertonic sodium chloride solutions and isotonic volume expansion in the rat

Physiological recordings: Basic concepts and implementation during functional magnetic resonance imaging

Cardiac sympathetic afferent influences on renal nerve activity

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