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Type 3 Phosphodiesterase Inhibitors May Be Protective Against Cerebrovascular Events In Patients With Claudication

William M Stone, Richard J Fowl, Samuel R Money.
Mayo Clinic Arizona, Phoenix, AZ.

OBJECTIVES: The risk of cerebrovascular events in patients with mild to moderate peripheral vascular disease is significant. Cilostazol is a phosphodiesterase type 3 (PDE3) inhibitor that is effective in the treatment of symptoms of peripheral arterial occlusive disease. The method of action includes antithrombotic, vasodilatory, and antiproliferative effects.

METHODS: The CASTLE trial was a prospective randomized double blinded trial to establish the safety of this PDE3 inhibitor use in 1435 patients with mild to moderate peripheral arterial occlusive disease. A post-hoc analysis of the CASTLE trial was undertaken to evaluate Cilostazol usage on cerebrovascular events. Blinded adjudication of all cerebrovascular events (stroke, TIA, and carotid revascularization) in this trial was performed. Kaplan Meier analysis was used for statistical evaluation.

RESULTS: The overall rate of cerebrovascular events was 4.6% (66 of 1435 patients) with a mean followup of 515 days. Ischemic vascular events were more common (2.5%) than hemorrhagic events (0.3%), (p<0.05). The placebo group demonstrated a greater risk for events, 5.8% (42 of 718 patients) vs. the Cilostazol treated group, 2.9% (21 of 717 patients), ( p<0.05). Cerebrovascular risk factors were similar in both groups.

CONCLUSIONS: The risk of cerebrovascular events in patients with mild to moderate peripheral arterial occlusive disease is 4.6% with a mean followup of 515 days. Treatment with PDE3 inhibitors may reduce this risk. Further evaluation of the use of PDE3 inhibitors for prevention of cerebrovascular events should be considered.