Relationship between invasive physiological assessment with FFR and IMR and biological markers as micro-RNA's according to coronary vascular compartiment affected (Group 1: Macrovasculature + / Microvasculature +; Group 2: Macrovasculature + / Microvasculature -; Group 3: Macrovasculature - / Microvasculature +; Group 4: Macrovasculature - / Microvasculature -). Also, biological markers will be related with presence of microvascular spasm or macrovascular spasm (Group 5).

Patients with chest pain suggestive of angina after ruling out other cardiac and non-cardiac causes, referred for invasive coronary angiography, will be evaluated by coronary angiography and invasive coronary physiological assessment by determining FFR and IMR and by performing a vasoreactivity test with acetylcholine.

A relationship will be established between the invasive physiological assessment with FFR and IMR and biological markers such as micro-RNA's according to the affected coronary vascular compartment (Group 1: Macrovasculature + / Microvasculature +; Group 2: Macrovasculature + / Microvasculature -; Group 3 : Macrovasculature - / Microvasculature +; Group 4: Macrovasculature - / Microvasculature -). In addition, the biological markers will be related to the presence of microvascular spasm or macrovascular spasm (Group 5).

Finally, among other biological markers, the following miRNAs will be compared. These miRNA's present consistent data in the literature about their over or underexpression.

Inclusion Criteria:

1. Age ≥ 18 years.
2. Patients with chest pain suggestive of angina evaluated by a cardiologist referred for diagnostic coronary angiography and possible coronary intervention.
3. Echocardiogram ruling out noncoronary cardiac causes of chest pain.
4. Informed consent.

Exclusion Criteria:

1. Contrast allergy not susceptible to premedication.
2. Severe bronchial asthma or adenosine intolerance.
3. Atrio-ventricular block (≥ 2nd degree) or acetylcholine intolerance.
4. Acute myocardial infarction with ST-segment elevation.
5. Acute myocardial infarction without ST-segment elevation.
6. Cardiogenic shock.
7. Total occlusion of any coronary artery that precludes measurements with pressure-temperature guidewires.
8. Previous coronary artery bypass grafting.
9. Women with the possibility of being pregnant.
10. Renal dysfunction with an estimated glomerular filtration rate <30 mL/min/1.73m2.
11. Inability to understand the nature of the study and / or sign informed consent.
12. Any other medical condition that, in the opinion of the researcher, may lead to safety issues for patients or may alter the results of the study.

Patients with angor pectoris referred for coronary angiography after excluding other cardiaca and non-cardiac causes of chest pain

No specific time frame

Each center will fill an anonymized and predefined case report form (CRF) developed by the investigators. The selected variables are oriented to the cardiovascular risk factors, comorbidities, clinical findings, ischemia detection tests, medications, analytical parameters, echocardiographic and angiographic findings, and invasive physiological indexes. All data collected during the study, after deidentification, will be shared. Data obtained through this study may be provided to qualified researchers with academic interest in cardiovascular diseases. Approval of the request and execution of all applicable agreements are prerequisites for the sharing of data with the requesting party.