The fusion of narrow-QRS sinus-generated beats with end-diastolic ventricular extrasystoles occurring in bigeminy can produce an electrocardiographic pattern difficult to differentiate from parasystole. Such an ECG should not be interpreted as 2:1 RBBB because of the variability of the PR intervals.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10692837 | PMC |
| http://dx.doi.org/10.1002/joa3.12940 | DOI Listing |
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