Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/81222
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Type: Journal article
Title: Cardiovascular magnetic resonance of total and atrial pericardial adipose tissue: A validation study and development of a 3 dimensional pericardial adipose tissue model
Author: Mahajan, R.
Kuklik, P.
Grover, S.
Brooks, A.
Wong, C.
Sanders, P.
Selvanayagam, J.
Citation: Journal of Cardiovascular Magnetic Resonance, 2013; 15(1):1-7
Publisher: Marcel Dekker Inc
Issue Date: 2013
ISSN: 1097-6647
1532-429X
Statement of
Responsibility: 
Rajiv Mahajan, Pawel Kuklik, Suchi Grover, Anthony G Brooks, Christopher X Wong, Prashanthan Sanders and Joseph B Selvanayagam
Abstract: BACKGROUND Recently pericardial adipose tissue (PAT) has been shown to be an independent predictor of atrial fibrillation (AF). Atrial PAT may influence underlying atrial musculature creating a substrate for AF. This study sought to validate the assessment of total and atrial PAT by standard cardiovascular magnetic resonance (CMR) measures and describe and validate a three dimensional atrial PAT model. METHODS 10 merino cross sheep underwent CMR using a 1.5 Tesla system (Siemens, Sonata, Erlangen, Germany). Atrial and ventricular short axis (SA) images were acquired, using ECG -gated steady state free precession sequences. In order to quantify total volume of adipose tissue, a three dimensional model was constructed from consecutive end-diastolic images using semi-automated software. Regions of adipose tissue were marked in each slice followed by linear interpolation of pixel intensities in spaces between consecutive image slices. Total volume of adipose tissue was calculated as a total volume of the three dimensional model and the mass estimated from volume measurements. The sheep were euthanized and pericardial adipose tissue was removed and weighed for comparison to the corresponding CMR measurements. RESULTS All CMR adipose tissue estimates significantly correlated with autopsy measurements (ICC > 0.80; p < 0.03). Intra- observer reliability in CMR measures was high, with 95% levels of agreement within 5.5% (ICC = 0.995) for total fat mass and its individual atrial (95% CI ± 8.3%, ICC = 0.993) and ventricular components (95% CI ± 6.6%, ICC = 0.989). Inter- observer 95% limits of agreement were within ± 10.7% (ICC = 0.979), 7.4% (ICC = 0.991) and 7.2% (ICC = 0.991) for atrial, ventricular and total pericardial adipose tissue, respectively. CONCLUSION This study validates the use of a semi-automated three dimensional atrial PAT model utilizing standard (clinical) CMR sequences for accurate and reproducible assessment of atrial PAT. The measurement of local cardiac fat stores via this methodology could provide a sensitive tool to examine the regional effect of fat deposition on atrial substrate which potentially may influence AF ablation strategies in obese patients.
Keywords: Atrial; Pericardial adipose tissue; Validation; CMR
Rights: © 2013 Mahajan et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
RMID: 0020131333
DOI: 10.1186/1532-429X-15-73
Appears in Collections:Medicine publications

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