Cine and Tagged Cardiovascular Magnetic Resonance Imaging in Normal Rat at 1.5 T: a Rest and Stress Study

Overview

Journal J Cardiovasc Magn Reson

Publisher Elsevier

Specialties Cardiology & Vascular Diseases
Radiology

Date 2008 Nov 5

PMID 18980685

Citations 10

Authors

Jean-Luc Daire

Jean-Pascal Jacob

Jean-Noel Hyacinthe

Pierre Croisille

Karin Montet-Abou

Sophie Richter

Diomidis Botsikas

Matthieu Lepetit-Coiffe

Denis Morel

Jean-Paul Vallee

Affiliations

Soon will be listed here.

Abstract

Background: The purpose of this study was to measure regional contractile function in the normal rat using cardiac cine and tagged cardiovascular magnetic resonance (CMR) during incremental low doses of dobutamine and at rest.

Methods: Five rats were investigated for invasive left ventricle pressure measurements and five additional rats were imaged on a clinical 1.5 T MR system using a cine sequence (11-20 phases per cycle, 0.28/0.28/2 mm) and a C-SPAMM tag sequence (18-25 phases per cycle, 0.63/1.79/3 mm, tag spacing 1.25 mm). For each slice, wall thickening (WT) and circumferential strains (CS) were calculated at rest and at stress (2.5, 5 and 10 microg/min/kg of dobutamine).

Results: Good cine and tagged images were obtained in all the rats even at higher heart rate (300-440 bpm). Ejection fraction and left ventricular (LV) end-systolic volume showed significant changes after each dobutamine perfusion dose (p < 0.001). Tagged CMR had the capacity to resolve the CS transmural gradient and showed a significant increase of both WT and CS at stress compared to rest. Intra and interobserver study showed less variability for the tagged technique. In rats in which a LV catheter was placed, dobutamine produced a significant increase of heart rate, LV dP/dtmax and LV pressure significantly already at the lowest infusion dose.

Conclusion: Robust cardiac cine and tagging CMR measurements can be obtained in the rat under incremental dobutamine stress using a clinical 1.5 T MR scanner.

Citing Articles

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