As he looked back at the van, his heart started to beat rapidly.

"I hope this will work," he thought with rapidly beating heart.

In combination, they can increase blood pressure and cause the heart to beat rapidly.

Her rapidly beating heart returned to normal after a few minutes.

Her heart beat a little more rapidly, but she was not afraid.

His heart, for no reason he could understand, was beating rapidly.

He beat on it rapidly for a short time, then stopped suddenly.

I felt my heart beating rapidly and took a breath.

His heart was beating rapidly now, though not with fear any more.

I could hear a heart now and it began beating rapidly.