GlossaryImmunomodulators: weaken or modulate the activity of the immune system.Hypoxia: Decreased concentration of oxygen in the blood. Tracheostomy: Surgery to create an opening (stoma) into the windpipe. The opening itself may also be called a tracheostomy.Iatrogenic: Unintended and unwanted result of treatment. Published on Mar 08, 2017Last Updated on Mar 09, 2017