Two will continue playing but will have chronic problems with acute episodes along the way

五分之二会继续弹奏乐器但是会有周期性的问题，伴随着急性发作的病症。

Children with TOF may develop acute episodes of hypoxia, known as Tet spells, during activities that demand more oxygen.

法四的儿童在活动时，需氧增多，可出现急性缺氧发作，又称Tet spells。