PMC3235988_01
Surface EKG showing spikes inside the QRS complexes.
ccrep-4-2011-069f1.jpg
PMC3235988_01_ccrep-4-2011-069f1.jpg
f1-ccrep-4-2011-069
When the patient presented for regular PM check, his EKG (Fig. 1) showed intermittent spikes within the QRS complexes.