Q: Can you please help me locate information regarding etiologies of transient ischemic attack (TIA)? I would like to use this information to help my CDI team encourage physicians to consider “precerebral stenosis” as a possible cause of TIA where there is any narrowing.
A: The most important thing to keep in mind is that anti-platelet therapy is recommended for every patient with any degree of carotid stenosis because it can cause stroke or cerebral vascular accident (CVA).
If a patient has had a TIA and any degree of stenosis is present the risk is higher. If stenosis is less than 50% only medical therapy (including anti-platelet drugs) is recommended, never surgery. If the physician notes greater than 70% stenosis (“critical stenosis”), medical therapy is inadequate and surgery is almost always necessary.
Many physicians become confused by the meaning of “non-critical” stenosis thinking it means “insignificant,” but they always treat the patient with anti-platelet drugs to prevent TIA or stroke. However, “non-critical” means simply that surgery is not yet indicated.
Do try to approach the physicians/neurologists at your facility to help you develop appropriate queries and to identify the supporting information they most typically turn to identify TIA etiologies. They could end up being among your CDI team’s most valuable assets.