Interpolation in Alternate Cycles
Report:
Sinus rhythm 51/min
VEBs, interpolated in alternate cycles
Trigeminy
Non-specific ST/T changes
Comment:
The VEBs are typical, with nonsense axis and qR morphology in V1; their concealed retrograde conduction114, prolonging the PR intervals of the post-VEB sinus beats, also attests to their ventricular ectopic provenance.
This pattern is relatively common, being, as it were, a variant of bigeminy. If alternate P waves were completely blocked (rather than just having their PR intervals increased) this would become obvious bigeminy.
A more orthodox trigeminy, from the same source, was present in the patient’s preoperative ECG (Fig 128a).
Retrograde concealed conduction and block in the same trace (but from a different patient) are shown in 128b.
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