未下传的房性期前收缩的英文

nonconducted atrial extrasystoles

• 未:    did not; have not
• 下:    below; down; under ...
• 传:    commentaries on cl ...
• 的:    4次方是 The fourth po ...
• 房:    house
• 性:    nature; character; ...
• 期:    designated time
• 前:    front
• 收缩:    contract; shrink