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URL：https://ecgwaves.com/wp-content/uploads/2021/07/cardiac-conduction-system-His-Purkinje-bundle-branches-AV-node-sinoatrial-node-impulse-ECG-1536x841.png 掲載元：https://ecgwaves.com/topic/atrioventricular-av-block-ecg-blocks/
