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URL：https://i0.wp.com/a-fib.com/wp-content/uploads/2018/02/Normal-heart-labels-four-chambers-Sinus-Node-AV-Node-250-at-96-res.png?resize=250,235&ssl=1 掲載元：https://a-fib.com/treatments-for-atrial-fibrillation/av-node-with-pacemaker/
