The best ECG quality (greatest QRS amplitude, visible P-wave and pacemaker spike, measurable QT period and bundle-branch block) and the best agreement with standard lead II was found in 67% left parasternal, significant less often (p<0.001) right parasternal (14.3%), left subclavicular (7.1%), apical (5.7%), and subxiphoidal (4.3%).
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