Journal ArticleDOI
Circulatory effects of interruption and stimulation of cardiac vagal afferents.
B. ÖBerg,Saxon William White +1 more
TLDR
The influence of the rhythmic activity in cardiac vagal afferents on the circulation was analyzed in chloralose-anesthetized cats by observing the cardiovascular responses to sudden interruption of this activity and to afferent stimulation of the cardiac nerves.Abstract:
The influence of the rhythmic activity in cardiac vagal afferents on the circulation was analyzed in chloralose-anesthetized cats by observing the cardiovascular responses to sudden interruption of this activity and to afferent stimulation of the cardiac nerves. The evoked responses were compared with those produced by “unloading” and stimulation of arterial baroreceptors. — Elimination of the impulse traffic in vagal afferents produced a blood pressure rise, a tachycardia and vasoconstrictions in skeletal muscle, intestine and kidney, indicating a tonic restraint of these afferents on the medullary vasomotor centre. The responses were generally moderate in the presence of normally functioning arterial baroreceptors but were pronounced after elimination of “buffering” influences from these receptors. — Comparisons of the inhibitory influences from vagal cardiac afferents and baroreceptor afferents, respectively, on the vasomotor centre indicated that the former were preferentially directed to neurons controlling the efferent discharge to the heart and the renal vessels. There was no evidence for a particularly strong engagement of the capacitance vessels in reflex patterns mediated through cardiac afferents. — Low frequency afferent stimulation of the cardiac nerves generally induced a profound brady-cardia, which was probably due to stimulation of fibres not normally tonically active.read more
Citations
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Journal ArticleDOI
Evaluation of vagal afferent modulation of the digastric reflex in cats
TL;DR: Cardiopulmonary vagal afferents represent an important source of vagalAfferents which modulate the digastric reflex in the cat, and are suggested to be related to cardiovascular responses to vagalafferent stimulation.
Journal ArticleDOI
Standard and Higher Doses of Atropine in a Canine Model of Pulse less Electrical Activity
TL;DR: In this canine model of asphyxial PEA cardiac arrest, standard-dose atropine did not improve ROSC rates, compared with placebo.
Journal ArticleDOI
Avian cardiac receptors: activity changes by blood pressure, carbon dioxide, and pH.
J Estavillo,RE Burger +1 more
TL;DR: Spontaneous activity of most cardiac receptors is negatively correlated with Paco2 in the physiological range, whereas a highly variable and small relationship is seen with PH.
Journal ArticleDOI
Impairment of inhibitory cardiopulmonary vagal reflexes in spontaneously hypertensive rats
TL;DR: It is suggested that cardiopulmonary reflexes are impaired in the SHR rat although some amelioration of this phenomenon may occur as hypertension develops.
OtherDOI
Neurohormonal control of gastrointestinal blood flow
Mats Jodal,Ove Lundgren +1 more
TL;DR: The sections in this article are: Neurotransmitters and/or Hormones, Hormone Candidates, Integrated Responses, and Neurotransmitter Candidates.
References
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Journal Article
Comparative studies on the adrenergic neuro-hormonal control of resistance and capacitance blood vessels in the cat.
Journal ArticleDOI
Vagal Afferent Fibres
TL;DR: The cervical vagus consists of about 30 thousand fibres of which about 24 000 are sensory in function and about 3 thousand are myelinated and have been the centre of attraction in electrophysiological studies chiefly owing to the relative ease with which impulses can be recorded in them.
Journal ArticleDOI
A study of right and left atrial receptors.
TL;DR: It will be shown that all such receptors encountered so far arose in the right and left atria of the heart; these will be referred to as type B atrial receptors.
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