['microvascular angina']
['ranolazine', 'placebo']

        Inclusion Criteria:

          -  History of typical angina or effort-induced anginal symptoms and are currently
             experiencing angina at least once per week

          -  Abnormal stress ECG, exercise stress imaging, or pharmacological stress imaging

          -  Non-obstructive coronary artery disease as defined by lesion stenosis ≤ 50% in any
             artery as visualized by diagnostic angiography

        Exclusion Criteria:

          -  Inability to provide informed consent

          -  Active Myocardial Infarction

          -  History of coronary artery bypass grafting

          -  Diagnosis of other specific cardiac disease such as severe valvular heart disease,
             cardiomyopathy, or variant angina

          -  Left Ventricular Ejection Fraction (LVEF) < 30%

          -  Known renal insufficiency (CrCl < 30 mL/min) or on dialysis

          -  Contraindications to the use of Ranolazine
      