Well, he looked at his EKG and he said, Oh, this is a right side heart attack.

好吧，他看了一下心电图然后说，哦，这是右侧心脏病发作。

When the defect is large, a clinically significant left-to-right blood flow may overload the right side of the heart, resulting in its enlargement and eventually right side heart failure.

当缺损很大时，临床上显著的从左到右的血流可能会使心脏右侧超负荷，导致心脏右侧增大，最终导致右心衰竭。