The principal objective of this research is to determine whether symptoms, induced by confirmed experimental ischaemia, can help us predict which patients will respond to PCI.

Inclusion Criteria:

1. Angina or angina-equivalent symptoms
2. Anatomical evidence of a significant single vessel coronary stenosis on diagnostic coronary angiography indicating ≥ 70% stenosis
3. Referred for percutaneous coronary intervention for treatment of stable angina

Exclusion Criteria:

1. Age younger than 18
2. Age older than 85
3. Recent acute coronary syndrome
4. Multivessel coronary artery disease
5. Previous coronary artery bypass graft surgery
6. Significant left main stem coronary disease
7. Chronic total occlusion in the target vessel
8. Contraindication to percutaneous coronary intervention or drug-eluting stent implantation
9. Contraindication to antiplatelet therapy
10. Contraindication to adenosine infusion
11. Severe valvular disease
12. Severe LV systolic impairment
13. Severe respiratory disease
14. Life expectancy less than 2 years, pregnancy, unable to consent

Patients diagnosed with single-vessel coronary artery disease with symptoms of stable angina