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URL：https://3.bp.blogspot.com/-2oPN261nBN4/TqG9fX-N0eI/AAAAAAAAALY/pTAtiv-qp_A/s1600/1st degree av block.jpg 掲載元：https://www.medicinehack.com/2011/10/first-degree-atrioventricular-block-ecg.html
