Platelet activation in diabetic cardiovascular autonomic neuropathy

Aims Platelet activation is known to be associated with arrhythmic effects in myocardial ischaemia. The present study attempts to clarify whether diab etic cardiovascular autonomic neuropathy (CAN) is associated with intravasc ular platelet activation. Methods Platelet activation was assessed by flow cytometry analysis in 30 p atients with Type 1 diabetes mellitus screened for diabetic complications. Fifteen patients showed evidence of CAN as assessed by a battery of standar d cardiovascular autonomic reflex tests. Fifteen patients without CAN were then selected as a matched control group. Platelet activation was assessed by flow cytometric detection of activation-dependent platelet membrane anti gens (P-selectin (CD62), thrombospondin, lysosomal GP53 (CD63) and ligand-i nduced binding site-1 of GPIIb/IIIa (LIBS-1)). Results Significantly more activated platelets were detected in the patient s with CAN showing 20.9% (coefficient of variation (CV) 44%) CD63(+) (vs. 1 7.2% (CV 19%) in controls, P less than or equal to 0.05), 6.4% (CV 87%) CD6 2(+) (vs. 4.1% (CY 37%), P less than or equal to 0.05), and 6.7% (CV 55%) t hrombospondin(+) (vs. 4.6% (CV 39%), P less than or equal to 0.01) platelet s, respectively, LIBS-1 on platelets was nor significantly different betwee n patients with and without CAN. No correlation was found between glucose m etabolism and platelet activation. Conclusions Cardiovascular autonomic neuropathy is associated with platelet activation in Type 1 diabetes mellitus. The high platelet activation may r eflect an increased prothrombotic state in diabetic cardiovascular autonomi c dysfunction.