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ECGs showing a sinus rhythm with prolonged PR interval of 260 ms approximately 10 h after taking ticagrelor loading dose (a), complete atrioventricular block on the next (second) day (b), mild first degree atrioventricular block at 220 ms after the cessation of ticagrelor on the third day (c), and normal sinus rhythm without evidence of conduction disorder on the fourth day (d).
