Cerebral microembolism in acute myocardial infarction

Area of Science:

• Cardiology
• Neurology
• Medical Imaging

Background:

• Cerebral microemboli, detected as high-intensity transient signals (HITS) via transcranial Doppler (TCD), are a concern in acute myocardial infarction (AMI).
• Understanding the frequency and predictors of HITS in AMI patients is crucial for assessing embolic risk.

Purpose of the Study:

• To determine the incidence of HITS using TCD in patients with AMI.
• To identify risk factors associated with HITS in this population.
• To explore the relationship between HITS and clinical embolic events, including stroke.

Main Methods:

• 112 consecutive patients admitted to an acute coronary care unit within 72 hours were monitored for HITS using TCD.
• 2-dimensional echocardiograms were performed on all patients during the study period.
• Patients with inadequate ultrasound insonation were excluded from the analysis.

Main Results:

• HITS were detected in 17% of the studied AMI patients.
• A significantly higher frequency of HITS was observed in patients with reduced left ventricular (LV) ejection fraction (<65%), akinetic LV segments, and LV thrombus.
• Stroke was significantly more common in patients who exhibited cerebral microemboli.

Conclusions:

• Despite antithrombotic therapy, HITS were present in 17% of AMI patients.
• Reduced LV function, akinetic myocardial segments, and LV thrombus are associated with an increased occurrence of HITS.
• HITS may serve as a predictor of clinical embolic events, including stroke, in AMI patients.