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Published in: Journal of Cardiovascular Magnetic Resonance 1/2015

Open Access 01-12-2015 | Research

Feasibility and safety of adenosine cardiovascular magnetic resonance in patients with MR conditional pacemaker systems at 1.5 Tesla

Authors: Oliver Klein-Wiele, Marietta Garmer, Rhyan Urbien, Martin Busch, Kaffer Kara, Serban Mateiescu, Dietrich Grönemeyer, Michael Schulte-Hermes, Marc Garbrecht, Birgit Hailer

Published in: Journal of Cardiovascular Magnetic Resonance | Issue 1/2015

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Abstract

Background

Cardiovascular Magnetic Resonance (CMR) with adenosine stress is a valuable diagnostic tool in coronary artery disease (CAD). However, despite the development of MR conditional pacemakers CMR is not yet established in clinical routine for pacemaker patients with known or suspected CAD. A possible reason is that adenosine stress perfusion for ischemia detection in CMR has not been studied in patients with cardiac conduction disease requiring pacemaker therapy. Other than under resting conditions it is unclear whether MR safe pacing modes (paused pacing or asynchronous mode) can be applied safely because the effect of adenosine on heart rate is not precisely known in this entity of patients. We investigate for the first time feasibility and safety of adenosine stress CMR in pacemaker patients in clinical routine and evaluate a pacing protocol that considers heart rate changes under adenosine.

Methods

We retrospectively analyzed CMR scans of 24 consecutive patients with MR conditional pacemakers (mean age 72.1 ± 11.0 years) who underwent CMR in clinical routine for the evaluation of known or suspected CAD. MR protocol included cine imaging, adenosine stress perfusion and late gadolinium enhancement.

Results

Pacemaker indications were sinus node dysfunction (n = 18) and second or third degree AV block (n = 6). Under a pacing protocol intended to avoid competitive pacing on the one hand and bradycardia due to AV block on the other no arrhythmia occurred. Pacemaker stimulation was paused to prevent competitive pacing in sinus node dysfunction with resting heart rate >45 bpm. Sympatho-excitatory effect of adenosine led to a significant acceleration of heart rate by 12.3 ± 8.3 bpm (p < 0.001), no bradycardia occurred. On the contrary in AV block heart rate remained constant; asynchronous pacing above resting heart rate did not interfere with intrinsic rhythm.

Conclusion

Adenosine stress CMR appears to be feasible and safe in patients with MR conditional pacemakers. Heart rate response to adenosine has to be considered for the choice of pacing modes during CMR.
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Metadata
Title
Feasibility and safety of adenosine cardiovascular magnetic resonance in patients with MR conditional pacemaker systems at 1.5 Tesla
Authors
Oliver Klein-Wiele
Marietta Garmer
Rhyan Urbien
Martin Busch
Kaffer Kara
Serban Mateiescu
Dietrich Grönemeyer
Michael Schulte-Hermes
Marc Garbrecht
Birgit Hailer
Publication date
01-12-2015
Publisher
BioMed Central
Published in
Journal of Cardiovascular Magnetic Resonance / Issue 1/2015
Electronic ISSN: 1532-429X
DOI
https://doi.org/10.1186/s12968-015-0218-x

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