Electrocardiographic Data
Each participant underwent 12 lead ECG after 10 minutes of resting in
the supine position at 25 mm/s speed, with a 0.16–100 Hz filter range
and 10 mm/mV height. Electrocardiographic examinations were analyzed by
two independent cardiologists. ERP was defined according to the
definition of Haissaguerre et al. It was evaluated as a J point
elevation which has to be at least 0.1 mV above the isoelectric segment
in at least 2 contiguous leads, as well as has the presence of QRS
slurring or notching at the QRS terminal 1.
Participants were divided into two groups according to the presence of
ERP on the surface ECG: Group 1 was defined as individuals with ERP
whereas Group 2 was defined as individuals without ERP. The
inter-observer and intra-observer concordance rate for the presence of
ERP were 98.5% and 98.9%, respectively.