Doctor draws diagrams before carrying out surgery

The diagrams were regarded as preoperative preparations for better knowing the patients and also reference materials for doctors to perform heart surgeries.

Heart disease has become one of the biggest diseases in recent years, Cheng said.

He and his team carried out more than 800 surgeries last year, increasing from 21 surgeries in 2000, the first year he returned to Zhengzhou from Australia, he said.

Cheng hoped the schematic diagrams could make a contribution for the prevention and treatment of cardiovascular diseases in the future.

Besides his persistence on drawing the schematic diagrams, he also keeps improving techniques for his surgeries.