I had a stent placed in april '12 and have had a cough since. in the last 3 months it has become productive, but clear. i take no cardiac meds.

Stent,no meds,cough: Nonresolving cough needs evaluation. Common causes include sinus drainage or esophageal reflux.. More worrisome causes would include lung pathology including cancer or pulmonary embolism. Most patients who have stents placed should be on an ace inhibitor like Lisinopril - this can cause chronic cough. Aspirin and statins are also good post-stent meds; surprising that you are not on these.

Unclear: First thought would've been ace inhibitor cough but you should be on aspirin& statin & possibly Plavix (clopidogrel) (unrelated but important for stent & cad). Talk to your physician.