LETTERS TO THE EDITOR doi:10.1093/europace/eup354 Detection of T-wave

alternans by exercise stress testing, atrial-pacing, and atrioventricular pacing In a recent work, Kraaier et al.1 explored whether atrial pacing (AP) and atrioventricu-lar (AV) pacing lead to fewer indeterminate microvolt T-wave alternans (MTWA) tests than exercise (E) in a group of 30 patients with ischaemic cardiomyopathy who had been previously implanted with dual-chamber implantable-cardioverter defibrillators. They also concluded that this was actually the case, and that the discordance between characterization of positive and non-negative results of MTWA by pairs of the abov