For androids it says to just pick the the injury that is one step down... which can easily lead to a system shutdown given that there is only 6 options.
But for humans it doesn't say this, and even being a rare situation due to the large amount of injuries listed in the table, I would like to know what is the right approach because shifting down or not towards the end of the table is the difference between living or dying. I personally think shifting down makes sense... but alternatively you could reapply the same injury and reset or accumulate the healing time... the first 5 injuries (11 to 15) don't have healing time though, so it will mean nothing to suffer that injury again.