Turtle roll To master the waves of ECG
AP contains Na channels which may show multiple properties. Intermittent Pre-excitation indicate intact AVN and low risk of development of arrythmias Concealed conduction occurs when sinus ECG shows no Pre- excitation but AVRT during arrythmia Antidromic AVRT occurs when impulse during arrythmia preferentially travels across AP(= Wide QRS) mimcking VT, hence Na+ blockers like Flecainide preferred SVT refractory to Adenosine reverted with IV CCB/Beta-blockers / electrical cardioversion
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