Endocardial infarct scar recognition by myocardial electrical impedance is not influenced by changes in cardiac activation sequence
Amorós-Figueras, Gerard (Institut d'Investigació Biomèdica Sant Pau)
Jorge, Esther (Centro de Investigación Biomédica en Red en Enfermedades Cardiovasculares)
Alonso-Martin, Concepción (Institut d'Investigació Biomèdica Sant Pau)
Traver, Daniel (Biosense Webster)
Ballesta, Maria (Universitat Politècnica de Catalunya)
Bragos, Ramon (Universitat Politècnica de Catalunya)
Rosell Ferrer, Javier (Universitat Politècnica de Catalunya)
Cinca, Juan (Institut d'Investigació Biomèdica Sant Pau)
Universitat Autònoma de Barcelona

Date:	2018
Abstract:	Measurement of myocardial electrical impedance can allow recognition of infarct scar and is theoretically not influenced by changes in cardiac activation sequence, but this is not known. The objectives of this study were to evaluate the ability of endocardial electrical impedance measurements to recognize areas of infarct scar and to assess the stability of the impedance data under changes in cardiac activation sequence. One-month-old myocardial infarction confirmed by cardiac magnetic resonance imaging was induced in 5 pigs submitted to coronary artery catheter balloon occlusion. Electroanatomic data and local electrical impedance (magnitude, phase angle, and amplitude of the systolic-diastolic impedance curve) were recorded at multiple endocardial sites in sinus rhythm and during right ventricular pacing. By merging the cardiac magnetic resonance and electroanatomic data, we classified each impedance measurement site either as healthy (bipolar amplitude ≥1. 5 mV and maximum pixel intensity <40%) or scar (bipolar amplitude <1. 5 mV and maximum pixel intensity ≥40%). A total of 137 endocardial sites were studied. Compared to healthy tissue, areas of infarct scar showed 37. 4% reduction in impedance magnitude (P <. 001) and 21. 5% decrease in phase angle (P <. 001). The best predictive ability to detect infarct scar was achieved by the combination of the 4 impedance parameters (area under the receiver operating characteristic curve 0. 96; 95% confidence interval 0. 92-1. 00). In contrast to voltage mapping, right ventricular pacing did not significantly modify the impedance data. Endocardial catheter measurement of electrical impedance can identify infarct scar regions, and in contrast to voltage mapping, the impedance data are not affected by changes in cardiac activation sequence.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Electroanatomic mapping ; Healed myocardial infarction ; Myocardial electrical impedance ; Pig ; Ventricular pacing
Published in:	Heart Rhythm, Vol. 15 Núm. 4 (april 2018) , p. 589-596, ISSN 1556-3871

DOI: 10.1016/j.hrthm.2017.11.031
PMID: 29197656

8 p, 1.3 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Health sciences and biosciences > Institut de Recerca Sant Pau
Articles > Research articles
Articles > Published articles