The effect of pretreatment with a loading dose of intracoronary adenosine on periprocedural myonecrosis in patients undergoing percutaneous coronary intervention in the setting of non ST segment elevation acute coronary syndrome

This study is looking at whether giving a dose of a drug called adenosine directly into the heart artery before a procedure to open a blocked artery (coronary angioplasty) can reduce damage to the heart muscle. The study is specifically for patients who are having the procedure due to a type of heart attack called non-ST elevation acute coronary syndrome. Adenosine has shown benefits in other heart procedures, and this study wants to see if it works here too. You may be eligible if: - You are 18 years or older - You have been diagnosed with non-ST elevation acute coronary syndrome (a type of heart attack) - You are being treated with coronary angioplasty You may NOT be eligible if: - You have had a STEMI (a more severe type of heart attack with ST elevation on ECG) - You are in cardiogenic shock - You have a very slow heart rate or heart block - You have severe asthma - You are allergic to adenosine - You are pregnant or unconscious - You have uncontrolled dangerous heart rhythms Talk to your doctor about whether this trial might be right for you.