The Effects of Stimulation of the Left Atrial Receptors in the Cat

Scott, Evelyn M.; Roberts, Adrienne; Tierney, Nancy

doi:10.1113/expphysiol.1982.sp002672

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…Vatner & Zimpfer (1981) found in conscious baboons, weighing from 20 to 25 kg, that rapid volume expansion always resulted in an increase in heart rate; whereas in small conscious baboons no effect on heart rate was observed following a similar intervention. Scott et al (1982) found that the responses of an increase in afferent atrial receptor discharge and an increase in heart rate to distension of small balloons at the pulmonary vein-atrial junctions in the cat were smaller than those previously obtained in the dog (Linden & Kappagoda, 1982).…”

Section: Discussioncontrasting

confidence: 41%

“…For instance, in some reports the reflex increases in heart rate and urine flow were not consistently obtained in response to stimulation of the atrial receptors by interventions such as volume expansion, distension of balloons in the left atrium or the pulmonary vein-atrial junctions, and head-out immersion in small animals such as monkeys and cats (Zucker & Gilmore, 1975;Gilmore & Zucker, 1978 a, b;Vatner & Zimpfer, 1981;Cornish & Gilmore, 1982;Scott, Roberts & Tierney, 1982). The complexity of the diffuse stimulus and the small responses related to the small size of the atrium may have resulted in an inconsistency of response.…”

Section: Discussionmentioning

confidence: 99%

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The relationship between left atrial pressure and atrial receptor discharge in dogs and cats with different body weights

Hicks¹,

Rj²,

Mary³

1990

Experimental Physiology

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SUMMARYThe diuretic response to distension of a large balloon in the left atrium and the increase in discharge of atrial receptors for a given increment in left atrial pressure have been found to be greater in dogs with a high blood volume than in dogs with a low blood volume. To determine whether atrial size may influence atrial receptor discharge, a group of cats and two groups of dogs with different body weights were examined under anaesthesia with a-chloralose. The relationship between atrial receptor discharge and left atrial pressure was determined in twentysix fibres from seven cats, thirty-seven fibres from eight small dogs weighing less than 15 kg and twenty-five fibres from five large dogs weighing more than 25 kg. The slope of the relationship between the increase in atrial receptor activity and increments in left atrial pressure was shown to be significantly greater in the large dogs than in the small dogs, and the slopes in dogs were greater than in cats. The size of the atria was greater in larger dogs than small, and both those groups had atria larger than those of the cats. These findings indicate that the response of an increase in atrial receptor discharge to the same increment in left atrial pressure was greater in large animals than small and that this difference is possibly due to the different atrial size.

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Section: Discussioncontrasting

confidence: 41%

Section: Discussionmentioning

confidence: 99%

The relationship between left atrial pressure and atrial receptor discharge in dogs and cats with different body weights

Hicks¹,

Rj²,

Mary³

1990

Experimental Physiology

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Afferent vagal control of fluid absorption in the feline jejunum

Sjövall

1985

Acta Physiologica Scandinavica

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The aim of the study was to test experimentally whether vagal afferent pathways are involved in the reflex regulation of jejunal fluid absorption. Acute bilateral cervical vagotomy led to an increase in net jejunal fluid absorption rate, an effect which was abolished by previous division of the splanchnic nerves. Selective division of the right cardiac branch of the vagal nerve induced an increase in fluid absorption similar to that elicited by truncal cervical vagotomy. Afferent stimulation of the right cardiac nerve at frequencies within the physiological firing range for unmyelinated C-fibre afferents induced an inhibition of net fluid absorption. Based on these findings, we propose a reflex pathway containing a non-myelinated vagal afferent branch originating from cardiopulmonary receptor endings, and an efferent sympathetic branch reaching the jejunum via the splanchnic nerves. Such a pathway might be of physiological importance in extracellular volume control by regulating the rate of fluid transport across the intestinal mucosa.

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The Effects of Stimulation of the Left Atrial Receptors in the Cat

Cited by 2 publications

References 17 publications

The relationship between left atrial pressure and atrial receptor discharge in dogs and cats with different body weights

The relationship between left atrial pressure and atrial receptor discharge in dogs and cats with different body weights

Afferent vagal control of fluid absorption in the feline jejunum

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