Cerebral Microembolization in Left Ventricular Assist Device Associated Ischemic Events.

Area of Science:

• Neurology
• Cardiology
• Medical Ultrasound

Background:

• The clinical significance of microembolic signals (MES) detected by transcranial Doppler ultrasound emboli monitoring (TCD-e) in patients with left ventricular assist devices (LVAD) is not well understood.
• Investigating MES in LVAD patients with acute ischemic events is crucial for understanding cerebral microembolization risks.

Purpose of the Study:

• To determine the prevalence and significance of cerebral microembolization, detected by TCD-e, in patients with LVADs who have experienced acute ischemic events.
• To explore the association between MES and clinical factors in LVAD patients.

Main Methods:

• A retrospective review of consecutive LVAD patients who suffered acute ischemic stroke or transient ischemic attack (TIA).
• Transcranial Doppler ultrasound emboli monitoring (TCD-e) was performed to detect microembolic signals (MES) in the middle cerebral arteries over 30 minutes.
• Analysis of clinical data, including bloodstream infections and coagulation parameters, in relation to MES presence.

Main Results:

• Of 35 LVAD patients with acute ischemic stroke or TIA, 44% showed MES on TCD-e within a median of 1 day post-event.
• Patients with MES had a higher incidence of bloodstream infections (38% vs. 8%).
• Trends suggested lower anticoagulation levels and higher lactate dehydrogenase in patients with MES, alongside a higher frequency of pump thrombosis.

Conclusions:

• Acute ischemic stroke or TIA patients with LVADs exhibit a high prevalence of MES detected by TCD-e.
• MES in LVAD patients may serve as a biomarker for a prothrombotic state.
• Further research into MES in LVAD patients is essential to elucidate its role and implications.