Extrasystole
期前收缩eks-trah-SIS-to-le 
 
        
        释义:
Premature heart contraction that occurs separately from the normal beat and originates from a part of the heart other than the SA node
Extrasystole
期前收缩释义:
Premature heart contraction that occurs separately from the normal beat and originates from a part of the heart other than the SA node