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Diagnosis of myocardial infarction and ischemia in the setting of bundle branch block and cardiac pacing

Diagnose von Myokardinfarkt und Ischämie bei Vorliegen eines Schenkelblocks und kardialer Stimulation

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Abstract

The diagnosis of myocardial infarction (MI) in the presence of left bundle branch block (LBBB) or during ventricular pacing (VP) is challenging because of inherent changes in the sequence of ventricular depolarization and repolarization associated with both conditions. Although LBBB and right ventricular (RV) pacing may both produce abnormalities in the ECG, it is often possible to diagnose an acute MI (AMI) or an old MI based on selected morphologic changes. Primary ST-segment changes scoring 3 points or greater according to the Sgarbossa criteria are highly predictive of an AMI in patients with LBBB or RV pacing. The modified Sgarbossa criteria are useful for the diagnosis of AMI in patients with LBBB; however, these criteria have not yet been studied in the setting of RV pacing. Although changes of the QRS complex are not particularly sensitive for the diagnosis of an old MI in the setting of LBBB or RV pacing, the qR complex and Cabrera sign are highly specific for the presence of an old infarct. Diagnosing AMI in the setting of biventricular (BiV) pacing is challenging. To date there is minimal evidence suggesting that the traditional electrocardiographic criteria for diagnosis of AMI in bundle branch block may be applicable to patients with BiV pacing and positive QRS complexes on their ECG in lead V1. This report is a careful review of the electrocardiographic criteria facilitating the diagnosis of acute and remote MI in patients with LBBB and/or VP.

Zusammenfassung

Die Diagnose eines Myokardinfarkts (MI) bei Vorliegen eines Linksschenkelblocks („left bundle branch block“, LBBB) oder während ventrikulärer Stimulation (VP) stellt eine Herausforderung dar aufgrund der inhärenten Sequenzveränderungen bei der ventrikulären Depolarisation und Repolarisation, welche mit beiden Erkrankungen assoziiert sind. Obwohl ein LBBB wie auch die rechtsventrikuläre (RV) Stimulation Abnormalitäten im EKG hervorrufen kann, ist es häufig möglich, auf der Basis bestimmter morphologischer Veränderungen einen akuten MI (AMI) oder einen zurückliegenden MI zu diagnostizieren. Primäre Veränderungen des ST-Segments von ≥3 Punkten gemäß den Sgarbossa-Kriterien stellen einen signifikanten Prädiktor eines AMI bei Patienten mit LBBB und RV-Stimulation dar. Die modifizierten Sgarbossa-Kriterien sind bei der Diagnosestellung eines AMI bei Patienten mit LBBB nützlich; diese Kriterien wurden im Rahmen einer RV-Stimulation noch nicht untersucht. Veränderungen des QRS-Komplexes sind bei der Diagnostik eines zurückliegenden MI bei Vorliegen eines LBBB oder RV-Stimulation nicht besonders sensitiv. Jedoch sind der QR-Komplex sowie das Cabrera-Zeichen hochspezifisch für das Vorliegen eines zurückliegenden Infarkts. Die Diagnose eines AMI bei Vorliegen einer biventrikulären (BiV) Stimulation ist schwierig. Bis heute gibt es nur sehr geringe Evidenz, die belegt, dass die traditionellen elektrokardiographischen Kriterien für die Diagnose eines AMI mit Schenkelblock bei Patienten mit BiV-Stimulation und positiven QRS-Komplexen im EKG in der V1-Elektrode anwendbar ist. Dieser Bericht beinhaltet ein sorgfältiges Review der elektrokardiographischen Kriterien, um die Diagnose eines akuten und zurückliegenden MI bei Patienten mit LBBB und/oder VP zu erleichtern.

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Correspondence to B. Herweg MD, FACC, FHRS, M. B. Marcus MD or S. S. Barold MD, FACC.

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B. Herweg, M.B. Marcus, and S. S. Barold state that there are no conflicts of interest.

The accompanying manuscript does not include studies on humans or animals.

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Herweg, B., Marcus, M.B. & Barold, S.S. Diagnosis of myocardial infarction and ischemia in the setting of bundle branch block and cardiac pacing. Herzschr Elektrophys 27, 307–322 (2016). https://doi.org/10.1007/s00399-016-0439-1

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