The patient's heart stopped beating for a few seconds.

病人的心跳停顿了几秒钟。

《牛津词典》

His heart stopped beating.

他的心脏停止了跳动。

《新英汉大辞典》

The second attack was so serious that his airway swelled, preventing him from breathing, his blood pressure dropped suddenly, and his heart stopped for a moment.

第二次发作很严重，他的气道肿胀，无法呼吸，血压突然下降，心脏停了一会儿。

youdao

Every heart stopped beating.

VOA: special.2009.04.18

If they're having a coronary artery bypass or they're having a heart transplant, then there's some period at which their normal heart - their heart is stopped and this machine assumes the functions of their heart.

病人在做冠状动脉搭桥手术,或者心脏移植手术时,病人自己的心脏,会停跳一段时间,而这台设备就能代替心脏工作

耶鲁公开课 - 生物医学工程探索课程节选

Austin Sergeev was even younger- only 11 when his heart stopped beating.

VOA: standard.2009.12.12

His heart stopped for 43 minutes before he was resuscitated, after which he underwent exploratory surgery.

BBC: Luke Jenkins death partly due to 'low staffing' levels

His heart stopped for 78 minutes but he was resuscitated after repeated shocks from a defibrillator.

BBC: Fabrice Muamba to appear in Strictly Come Dancing

He recovered even though his heart stopped for 78 minutes and had to be restarted several times.

BBC: Fabrice Muamba to start Great Manchester Run