Relationships between blood pressure and heart rate in the saltwater crocodile Crocodylus porosus

Altimiras, Jordi, Franklin, Craig E. and Axelsson, Michael (1998) Relationships between blood pressure and heart rate in the saltwater crocodile Crocodylus porosus. Journal of Experimental Biology, 201 15: 2235-2242.

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Author Altimiras, Jordi
Franklin, Craig E.
Axelsson, Michael
Title Relationships between blood pressure and heart rate in the saltwater crocodile Crocodylus porosus
Journal name Journal of Experimental Biology   Check publisher's open access policy
ISSN 0022-0949
1477-9145
Publication date 1998-01-01
Sub-type Article (original research)
Open Access Status File (Publisher version)
Volume 201
Issue 15
Start page 2235
End page 2242
Total pages 8
Place of publication Cambridge, United Kingdom
Publisher The Company of Biologists
Language eng
Abstract The cardiac limb of the baroreflex loop was studied in the saltwater crocodile Crocodylus porosus, The classical pharmacological methodology using phenylephrine and sodium nitroprusside was used to trigger blood pressure changes, and the resulting alterations in heart rate were analysed quantitatively using a logistic function. Interindividual differences in resting heart rates and blood pressures were observed, but all seven animals displayed clear baroreflex responses. Atropine and sotalol greatly attenuated the response. A maximal baroreflex gain of 7.2 beats min(-1) kPa(-1) was found at a mean aortic pressure of 6.1 kPa, indicating the active role of the baroreflex in a wide pressure range encompassing hypotensive and hypertensive states. At the lowest mean aortic pressures (5.0 kPa), the synergistic role of the pulmonary-to-systemic shunt in buffering the blood pressure drop also contributes to blood pressure regulation, Pulse pressure showed a better correlation,vith heart rate and also a higher gain than mean aortic, systolic or diastolic pressures, and this is taken as an indicator of the existence of a differential control element working simultaneously with a linear proportional element.
Keyword Biology
Crocodilian
Reptile
Baroreflex
Heart Rate
Blood Pressure
Shunt
Nitroprusside
Phenylephrine
Crocodylus Porosus
Toad Bufo-marinus
Baroreceptor Control
Pulmocutaneous Baroreceptors
Rana-catesbeiana
Alligator Heart
Physiology
Baroreflex
Responses
Reflex
Rabbit
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Biological Sciences Publications
Ecology Centre Publications
 
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Created: Mon, 13 Aug 2007, 20:34:54 EST