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Cardiovascular events associated with spontaneous apnea in the Australian short-finned eel,Anguilla australis

โœ Scribed by Hipkins, Scott F. ;Smith, David G.

Book ID
102890370
Publisher
John Wiley and Sons
Year
1983
Tongue
English
Weight
747 KB
Volume
227
Category
Article
ISSN
0022-104X

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โœฆ Synopsis

Heart output, arterial pressures, and buccal pressure were measured in conscious, unrestrained eels (Anguilla australis). The branchial ventilatory pattern comprised alternating periods of eupnea and apnea. The transition from eupnea to apnea was always associated with significant decreases in ventral aortic blood pressure (-20961, dorsal aortic blood pressure (-16%), ventral aortic blood flow (-39%) and heart rate (-27%), and a significant increase in systemic vascular resistance (+39%). Although there were significant decreases in cardiac stroke volume in some animals, heart output was primarily determined by heart rate. The rapidity of the transition to apnea and the occasional occurrence of Mayer waves in the circulation of A. australis is considered as evidence in favour of the neural regulation of systemic vascular resistance.

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โœ Smith, D. G. ;Duiker, W. ;Cooke, I. R. C. ๐Ÿ“‚ Article ๐Ÿ“… 1983 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 540 KB

Branchial and cutaneous 0 2 uptake as well as branchial ventilatory stroke volume and frequency were measured by twin-chamber respirometry in conscious unoperated eels (Anguilla australis) at 20ยฐC. The branchial ventilatory pattern comprised alternating periods of apnea and eupnea, together constitu