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With information you have given it seems that his Internal Juglar of right side is 90% blocked.
He has suffered a Stroke
due to brain Hemorrhage
,it depends on location and size of bleed inside of brain,which must have been detected by CT SCAN/MRI Angio.
This also depend on is he hypertensive and/or Diabetic.
This would be appropriate to consult a Neuro Surgeon if any kind of intervention is possible or not if possible with what success.
For instance a Sub dural hematoma
is treatable by surgery with good success but Brainstem
hemorrhage may not be?
Take good care