FIGURE 1
A, Baseline 12 lead Electrocardiogram (ECG) with lead II magnified in
the lower panel showing wide complex rhythm at a rate of 70 bpm (lower
rate of pacemaker) with intermittent narrower QRS complexes (140 ms) of
a different morphology. B, Long rhythm strip recorded while application
of magnet showing transition from wide to narrower complex rhythm (85
bpm). The magnet response starts after the arrow. C, Upper left hand
panel depicts a previous ECG without pacing (intrinsic rhythm). The
upper right hand panel shows the 12 leas long rhythm strip ECG recorded
during magnet response. The lower panel shows a magnified view of leads
aVF, V1, and V2. Atrial pacing spikes (black arrows), onset of magnet
response (blue arrow), and atrial/ventricular rates are also illustrated
(please also refer to discussion).