The Chinese government claims that its soldiers guarding the borders with India and Tajikistan are longer dying of altitude sickness. Adequate care is being taken of them, it asserts.
Those soldiers work 4,500 meters above sea level at decreased oxygen levels.
For the past four decades, Chinese military doctor Zhang Xizhou has been attending to their needs.
Serving with the No. 18 Hospital of the Xinjiang Military Command, Zhang said he is comforted by the fact that soldiers are no longer dying from altitude sickness.
"We managed to reduce the mortality rate from 1.7 percent to zero percent over the past 30 years," he said.
The 60-year-old doctor is now a renowned researcher at the Mountain Sickness Research Institute within the hospital. It serves dozens of military companies working along China's western most border where the Pamir, Karakoran and Himalayan mountain ranges intersect.
Every 1,000 meters up equals 10 percent less oxygen in the air. In a number of border posts in that region, thousands of soldiers live at least one year on oxygen which is 45 percent less than normal.
To them, high altitude pulmonary edema (HAPE) and high altitude cerebral edema (HACE), extreme forms of altitude sickness, are major threats.
According to military authorities, more than 300 soldiers have died of high altitude sickness since 1949.
"In the past 15 years, no one died of HAPE and HACE," Zhang said.