3 sentences

1. 血栓会导致血管梗塞。

   xuè​shuān huì dǎo​zhì xuè​guǎn gěng​sè.

   A blood clot can cause vascular obstruction.

   Source: Dong Chinese Dictionary

2. 由于血栓，这条血管已经闭塞了。

   yóu​yú xuè​shuān, zhè tiáo xuè​guǎn yǐ​jīng bì​sè le.

   Due to a blood clot, this blood vessel is blocked.

   Source: Dong Chinese Dictionary

3. 医生建议他服用药物以防止血栓形成。

   yī​shēng jiàn​yì tā fú​yòng yào​wù yǐ fáng​zhǐ xuè​shuān xíng​chéng.

   The doctor advised him to take medication to prevent thrombosis.

   Source: Dong Chinese Dictionary