Clot composition and recanalization outcomes in mechanical thrombectomy

Area of Science:

• Neuroscience
• Cardiovascular Research
• Medical Imaging

Background:

• Mechanical thrombectomy (MT) is standard for large vessel occlusions, but recanalization rates are suboptimal.
• Previous research suggests radiographic signs correlate with clot composition and treatment response.
• Understanding clot composition may improve MT outcomes.

Purpose of the Study:

• To investigate the relationship between clot composition and mechanical thrombectomy outcomes.
• To evaluate the impact of clot histology on first-pass effect (FPE) and number of passes during MT.

Main Methods:

• Analysis of clinical, imaging, and clot data from the STRIP Registry (Sept 2016-Sept 2020).
• Histological analysis of clot samples (hematoxylin-eosin, Martius Scarlett Blue staining).
• Evaluation of percent composition, richness, gross appearance, FPE rates, and number of passes.

Main Results:

• 1430 patients included; 39.3% achieved FPE.
• No overall association between clot histology and FPE.
• Combined stent-retriever and contact aspiration techniques showed lower FPE for RBC-rich, platelet-rich, and mixed clots.
• Fibrin-rich and platelet-rich clots required more passes.
• Mixed/heterogeneous clots had lower FPE rates than red and white clots.

Conclusions:

• Clot composition appears to influence mechanical thrombectomy outcomes.
• Findings support tailoring recanalization strategies based on clot characteristics.
• Further research is needed to fully elucidate the role of clot histology in stroke treatment.