Hi,
Your concerns about husband health are more than welcomed.
Coumadine treatment.means that he suffers from cardiac disease but protects him from cerebral vascular accidents or embolic events.
A head CT after trauma is done to exclude intracranial
injury like hemorrhage in the brain or
hematoma, which are treatment emergencies.
Fortunately for him that went well.
Meanwhile
ischemia, leukoencephalopathy have to do with cerebral matter suffering from cardiac disease,
hypertension, different problems that you husband had during his lifetime.
Cerebral atrophy is cerebral shrinkage that ocxurs naturally with age and greatly increases in elderly persons. These are chronic suffering of brain which most part of patients have.
You should pay attention if any other confusion, difficulty in speech, or difficulty in walking i.e changes from his normal general state to contact you doctor.
Of course pay attention from other Trauma...
Hope this helped, have a nice day