Opening a blocked artery with balloons and stents can be lifesaving in the early hours after a heart attack, but a new study concludes that it often does no good if the heart attack occurred more than 25 hours ago.

• 在心脏病发作的前几个小时内，通过充气囊和使用心脏支架以打开动脉可以拯救生命；但一项新研究表明；如果心脏病发作时间超过25小时后；这样做是没有任合益处的.