Recurrent stroke risk is higher than cardiac event risk after initial stroke/transient ischemic attack

Area of Science:

• Neurology
• Cardiology
• Public Health

Background:

• Patients with ischemic stroke and transient ischemic attack (TIA) are susceptible to recurrent cerebrovascular and cardiac events.
• Identifying the more probable recurrent event aids in planning preventive therapies.

Purpose of the Study:

• To compare the incidence of recurrent cardiac events versus recurrent stroke in patients with a history of ischemic stroke or TIA.
• To inform prophylactic therapy selection based on the likelihood of recurrent events.

Main Methods:

• A cohort of 1923 patients with ischemic stroke/TIA was identified from Michigan Medicare claims (2001-2001).
• Outcomes including cardiac events (MI, PTCA, CABG) and ischemic strokes were tracked from 2001 to 2003.
• Cumulative incidence estimates were used to compare the occurrence of cardiac events versus stroke as secondary events.

Main Results:

• Over the follow-up period, 239 patients experienced a stroke as their first recurrent event, while 172 had a cardiac event.
• The cumulative incidence of stroke at 2 years was 11.8%, compared to 7.7% for cardiac events.
• Myocardial infarction (MI) was the most common cardiac event, accounting for 62.8% of all cardiac events.

Conclusions:

• The risk of experiencing a recurrent stroke after an initial stroke or TIA is higher than the risk of a cardiac event.
• This suggests a greater propensity for recurrent ischemic events to manifest in the brain rather than the heart following an initial stroke/TIA.
• These findings have significant implications for the selection of prophylactic therapies in post-stroke/TIA patients.