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J Cardiovasc Electrophysiol. 2015 Jan;26(1):42-50. doi: 10.1111/jce.12555. Epub 2014 Nov 5.

Postmyocarditis ventricular tachycardia in patients with epicardial-only scar: a specific entity requiring a specific approach.

Author information

1
Hôpital Cardiologique du Haut-L'évêque, Université de Bordeaux, LIRYC Institut:, IHU LIRYC ANR-10-IAHU-04 et Equipex MUSIC ANR-11-EQPX-0030, Bordeaux, France.

Abstract

BACKGROUND:

Nonischemic cardiomyopathy is a heterogeneous condition providing a favorable substrate for ventricular tachycardia (VT).

OBJECTIVE:

The purpose of this study is to further characterize the substrate in a subset of postmyocarditis patients with epicardial-only scar.

METHODS:

Twelve postmyocarditis patients (11 male, 49 ± 14 years, left ventricular ejection fraction 49 ± 12%) with VT and epicardial-only scar were included for analysis comparing automatic high-amplitude normal activity (HANA) maps to manually adjusted maps of based on local abnormal ventricular activity (LAVA) electrograms when present. A combined endocardial (endo) and epicardial (epi) approach was used in 11/12 with usual bipolar/unipolar voltage thresholds and analyzed using image integration.

RESULTS:

A delayed enhancement MRI scar area of 52 cm(2) (38, 59) and multidetector CT wall thinning area of 18 cm(2) (14, 35) was found. Bipolar voltage substrate mapping (160 points [101, 239] endo, 553 points [232, 713] epi and LAVA were found only epicardially [443 LAVA points] in all) illustrated a low-voltage area of HANA: 1 cm(2) (0, 10) endo, 25 cm(2) (22, 39) epi and LAVA: 1 cm(2) (0, 10) endo, 39 cm(2) (28, 51) epi. Manual maps performed better than automatic maps for delineating low-voltage area with a higher overlap with scar area on delayed enhancement magnetic resonance imaging (DE-MRI; 76% [66, 94] vs. 45% [35, 62]; P = 0.04). In addition, manual voltage maps also showed a higher overlap with location of LAVA (LAVA in normal voltage area: 3% [0, 9] vs. 35% [32, 41]; P < 0.05).

CONCLUSION:

In postmyocarditis patients with epicardial-only scar, automatic voltage mapping may miss or minimize the electrical VT substrate. DE-MRI and manual LAVA-based voltage mapping are necessary to optimize scar delineation. Epicardial access is critical for mapping and ablation in this condition.

KEYWORDS:

LAVA; VT ablation; cardiac DE-MRI; epicardial scar; myocarditis

Comment in

PMID:
25257774
DOI:
10.1111/jce.12555
[Indexed for MEDLINE]

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