In the case of this SARS, when a patient is in ICU aka a Ventilator, a high amount of MV's are released within the lungs which then "transmit" signals and inflammation to other organs via the bloodstream, causing organs to fail.

This is the problem on this "sub" people think they know everything and this virus is like all other viruses, it acts differently from person to person, it affects people differently and is still very unknown.