Schrittmacher- und ICD-Elektrokardiogramme

Alternating QRS morphologies: what is the diagnosis?

Case presentation

A 73-year-old female with a history of complete heart block, coronary artery disease, and preserved left ventricular systolic function (ejection fraction 48 %) had had a dual-chamber permanent pacemaker (Sensia SEDR01, Medtronic, MN, USA) implanted 4 years previously. The patient presented to the cardiac rhythm and device clinic for regular follow-up.


What is the diagnosis of the electrocardiogram (ECG) (Fig.  1)?

The final publication is available at

Gul, E.E., Baranchuk, A., Brüggemann, B. et al. Herzschr Elektrophys (2019) 30: 11.

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