Sick sinus syndrome
Overview Sick sinus syndrome is the inability of the heart’s natural pacemaker (sinus node) to create a heart rate that’s appropriate for the body’s needs. It causes irregular heart rhythms…
VOA英语教学网 - VOA LEARNING ENGLISH
一个让你免费在线学习VOA英语的好地方! 无须报名, 不收学费, 全年无休, 保证提高! (^_^)
Overview Sick sinus syndrome is the inability of the heart’s natural pacemaker (sinus node) to create a heart rate that’s appropriate for the body’s needs. It causes irregular heart rhythms…