Cardiac memory‐related QT prolongation during right bundle‐branch block in a patient with pre‐existing left bundle‐branch block

Nakashima, Takashi; Takasugi, Nobuhiro; Sahashi, Yuki; Hatasa, Masanori; Kanamori, Hiromitsu; Okura, Hiroyuki

doi:10.1111/jce.14133

Cited by 2 publications

(2 citation statements)

References 8 publications

(14 reference statements)

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“…In fact, dramatic QT prolongation attributable to cardiac memory on conversion of atrial fibrillation with LBBB to sinus rhythm with different QRS morphology has been described. 34…”

Section: Miscellaneous Causes Of Cardiac Memory and Qt Prolongationmentioning

confidence: 99%

Arrhythmogenic Effects of Cardiac Memory

et al. 2022

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Cardiac memory is the term used to describe an interesting electrocardiographic phenomenon. Whenever a QRS complex is wide and abnormal, such as during ventricular pacing, the T waves will also be abnormal and will point to the opposite direction of the wide QRS. If the QRS then normalizes, such as after cessation of ventricular pacing, the T waves will normalize as well, but at a later stage. The period of cardiac memory is the phase between the sudden normalization of the QRS and the eventual and gradual return of the T waves to their baseline morphology. Cardiac memory is assumed to be an innocent electrocardiographic curiosity. However, during cardiac memory, reduction of repolarizing potassium currents increases left ventricular repolarization gradients. Therefore, when cardiac memory occurs in patients who already have a prolonged QT interval (for whatever reason), it can lead to a frank long QT syndrome with QT-related ventricular arrhythmias (torsades de pointes). These arrhythmogenic effects of cardiac memory are not generally appreciated and are reviewed here for the first time.

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“…In fact, dramatic QT prolongation attributable to cardiac memory on conversion of atrial fibrillation with LBBB to sinus rhythm with different QRS morphology has been described. 34…”

Section: Miscellaneous Causes Of Cardiac Memory and Qt Prolongationmentioning

confidence: 99%

Arrhythmogenic Effects of Cardiac Memory

et al. 2022

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“…In this issue of the journal, Nakashima et al report the case of an elderly woman with atrial fibrillation (AF) and chronic left bundle branch block (LBBB) who underwent direct current cardioversion to sinus rhythm and developed transient bradycardia due to second‐degree atrioventricular (AV) block along with right bundle branch block (RBBB). With RBBB, deep inverted T waves were noted, thought to represent CM accompanied by marked QT prolongation.…”

Section: Introductionmentioning

confidence: 99%