Invasive Coronary Angiography (ICA)  is used to determine the presence and severity of a luminal obstruction of an epicardial coronary artery,  including its location, length, and diameter, as well as coronary blood flow. ICA provides the characterization of high-grade obstructive stenosis and possibility for percutaneous or surgical revascularization. (IFR  and  FFR) provide  physiologic characteristic of stenosis. Radiation  exposure to  the patient  during an  interventional  procedure varied 4 to 10 mSv and is dependent on procedural duration and complexity. The spatial resolution of ICA is 0.3 mm, so, visualization of  arterioles (diameter  of  0.1  mm)  that  regulate myocardial  blood  flow is impossible. Coronary  vascular  functional  studies  can  be  performed  during  coronary  angiography. In  normal coronary angiography there may be evident  abnormal  coronary  vascular  function. Assessment of coronary  microcirculation and  coronary vasomotion by coronary function testing are reasonable.
Chest pain other diagnostic studies
Chest pain echocardiography and ultrasound
Chest pain other imaging findings
Palpitation other diagnostic studies
Cardiomegaly echocardiography or ultrasound
Cough echocardiography or ultrasound
Right heart failure chest x ray
Farmer's lung other diagnostic studies