Table 1 Eligibility criteria

1. Must be at least 20 years old. Capable of giving written informed consent.

1. Known coronary artery disease or unstable angina within the past 3 months.

2. Agrees to comply with the study protocol.

2. Acute myocardial infarction within the past 6 months.

3. Known low extremity artery disease (documented by previous angiography or sonography) admitted for elective percutaneous transluminal angioplasty.

3. Known coronary artery disease having received percutaneous coronary intervention or bypass surgery within the past 6 months.

4. Plans to do bypass surgery for known low extremity artery disease.

5. Has been pregnant.

6. Has documented active malignancy.

7. Needs emergency percutaneous transluminal angioplasty.