This association between an identical ECG morphology during entrainment and tachycardia and a long stimulus to QRS- or P-wave onset has been called "concealed entrainment" or, more appropriately ...

Regular and long-term participation in intensive exercise (minimum ... until there is a non-conducted P wave with no QRS complex (figure 7). The first PR interval after the dropped beat is shorter ...

Normal ECGs include common, training-related findings in athletes such as high QRS amplitude ... pathological Q-waves, left axis deviation and conduction delays and findings suggestive or diagnostic ...

preceding a blocked P and wide QRS 2:1 AV block Conducted impulse has long PR and narrow QRS; PR varies inversely with RP Conducted impulse has normal PR and wide QRS; PR is constant despite ...