Cardiac magnetic resonance, transthoracic and transoesophageal echocardiography: a comparison of in vivo assessment of ventricular function in rats

In vivo assessment of ventricular function in rodents has largely been restricted to transthoracic echocardiography (TTE). However 1.5 T cardiac magnetic resonance (CMR) and transoesophageal echocardiography (TOE) have emerged as possible alternatives. Yet, to date, no study has systematically asses...

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Bibliographic Details
Published in:Laboratory animals (London) 2013-10, Vol.47 (4), p.291-300
Main Authors: Richardson, JD, Bertaso, AG, Frost, L, Psaltis, PJ, Carbone, A, Koschade, B, Wong, DT, Nelson, AJ, Paton, S, Williams, K, Azarisman, S, Worthley, MI, Teo, KS, Gronthos, S, Zannettino, ACW, Worthley, SG
Format: Article
Language:English
Subjects:
Animals
Echocardiography - veterinary
Echocardiography, Transesophageal - veterinary
Heart Ventricles - diagnostic imaging
Heart Ventricles - pathology
Magnetic Resonance Imaging - veterinary
Male
Rats
Rats, Sprague-Dawley
Reproducibility of Results
Ventricular Function
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Summary:In vivo assessment of ventricular function in rodents has largely been restricted to transthoracic echocardiography (TTE). However 1.5 T cardiac magnetic resonance (CMR) and transoesophageal echocardiography (TOE) have emerged as possible alternatives. Yet, to date, no study has systematically assessed these three imaging modalities in determining ejection fraction (EF) in rats. Twenty rats underwent imaging four weeks after surgically-induced myocardial infarction. CMR was performed on a 1.5 T scanner, TTE was conducted using a 9.2 MHz transducer and TOE was performed with a 10 MHz intracardiac echo catheter. Correlation between the three techniques for EF determination and analysis reproducibility was assessed. Moderate-strong correlation was observed between the three modalities; the greatest between CMR and TOE (intraclass correlation coefficient (ICC) = 0.89), followed by TOE and TTE (ICC = 0.70) and CMR and TTE (ICC = 0.63). Intra- and inter-observer variations were excellent with CMR (ICC = 0.99 and 0.98 respectively), very good with TTE (0.90 and 0.89) and TOE (0.87 and 0.84). Each modality is a viable option for evaluating ventricular function in rats, however the high image quality and excellent reproducibility of CMR offers distinct advantages even at 1.5 T with conventional coils and software.
ISSN:0023-6772
1758-1117
DOI:10.1177/0023677213494373