Platelet abnormalities associated with cerebral perfusion defects in cocaine dependence

Area of Science:

• Neuroscience
• Hematology
• Addiction Medicine

Background:

• Cocaine dependence is associated with reduced regional cerebral blood flow (rCBF), a condition known as hypoperfusion.
• The relationship between hypoperfusion in cocaine-dependent (CD) individuals and platelet abnormalities remains unclear.
• Investigating platelet abnormalities could reveal predictive markers for hypoperfusion recovery in CD patients.

Purpose of the Study:

• To assess the association between platelet abnormalities and reduced rCBF in CD patients.
• To determine if platelet abnormalities predict improvement in hypoperfusion after one month of abstinence.
• To evaluate the impact of aspirin treatment on platelet aggregation and rCBF.

Main Methods:

• Fifty-four CD patients underwent SPECT imaging with Tc-HMPAO to measure rCBF.
• Platelet number and aggregation responses to adenosine diphosphate were measured at baseline and after one month of abstinence.
• Patients received either 325 mg aspirin or placebo during the abstinence period.

Main Results:

• Baseline hypoperfusion positively correlated with higher platelet aggregation.
• Five brain regions exhibited significantly more hypoperfusion in individuals with high platelet aggregation.
• Greater baseline platelet aggregation predicted greater rCBF improvement after abstinence, irrespective of treatment.

Conclusions:

• Platelet function is linked to hypoperfusion, particularly in brain regions supplied by the middle cerebral artery.
• These findings suggest that enhanced antiplatelet therapies beyond aspirin may benefit CD patients.
• Platelet aggregation could serve as a biomarker for predicting recovery of cerebral blood flow in cocaine dependence.