Magnetic resonance imaging (MRI) reveals high cardiac ejection fractions in red-footed tortoises (Chelonoidis carbonarius).
J Exp Biol
; 222(Pt 18)2019 09 16.
Article
em En
| MEDLINE
| ID: mdl-31439654
ABSTRACT
The ejection fraction of the trabeculated cardiac ventricle of reptiles has not previously been measured. Here, we used the gold standard clinical methodology - electrocardiogram-gated flow magnetic resonance imaging (MRI) - to validate stroke volume measurements and end diastolic ventricular blood volume. This produced an estimate of ejection fraction in our study species, the red footed tortoise Chelonoidis carbonarius (n=5), under isoflurane anaesthesia of 88±11%. After reduction of the prevailing right-to-left intraventricular shunt through the action of atropine, the ejection fraction was 96±6%. This methodology opens new avenues for studying the complex hearts of ectotherms, and validating hypotheses on the function of a more highly trabeculated heart than that of endotherms, which have lower ejection fractions.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Volume Sistólico
/
Tartarugas
Limite:
Animals
Idioma:
En
Revista:
J Exp Biol
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Dinamarca