Patients were excluded if they had any of the following: | |
Significant CAD (≥ 50% diameter stenosis) in coronary angiography | |
Acute coronary syndromes | |
History of coronary artery revascularization (CABG or PCI) | |
Dilated cardiomyopathy | |
Permanent pacemakers | |
Persistent arrhythmias | |
Significant valvular disease | |
Uncontrolled hypertension | |
Chronic kidney disease | |
Severe chronic lung disease | |
Severe anemia |