Medically reviewed by Nachiket J. Patel, MD, FACC, FSCAI. Last reviewed July 2026.
Coronary angiography, often called cardiac catheterization or a cardiac cath, is a catheter procedure that shows the arteries supplying the heart. It provides more detailed anatomy than a stress test and can allow treatment during the same session when appropriate.
Angiography and stenting are related but not identical. An angiogram diagnoses the anatomy. Percutaneous coronary intervention, or PCI, uses balloons, stents, and sometimes specialized tools to treat a selected blockage.
This is a diagnostic and treatment tool, not a screening test. The decision to proceed should be tied to symptoms, test results, anatomy, and expected benefit. A visible narrowing alone does not automatically justify a stent.
When is coronary angiography considered?
An emergency angiogram and an elective outpatient angiogram are different situations. New severe chest pressure or other heart-attack symptoms require 911, not scheduling through this page.
- A heart attack or unstable coronary syndrome
- Ongoing angina despite appropriate medical treatment
- A high-risk or strongly abnormal noninvasive test
- Symptoms with anatomy that remains uncertain
- Evaluation before selected valve or heart procedures
- Reassessment of a prior stent or bypass when clinically indicated
How is the procedure performed?
After local anesthetic and medication for comfort, a small tube is placed in an artery, commonly at the wrist or groin. A catheter is guided to the coronary arteries, and contrast is injected while X-ray images are recorded.
Pressure measurements, intravascular ultrasound, optical coherence tomography, or physiologic assessment may be used to clarify a borderline or complex lesion.
If PCI is appropriate, a balloon opens the narrowed segment and a stent supports the artery. Calcified disease may require additional plaque-modification technology.
How should I prepare?
The team provides exact fasting and medication instructions. Report kidney disease, contrast reaction, bleeding problems, current anticoagulants, diabetes medication, and any possibility of pregnancy.
Do not stop aspirin, clopidogrel, or another antiplatelet drug unless the procedural team specifically instructs you to. Bring a medication list and arrange transportation as directed.
Recent laboratory work commonly checks blood count and kidney function. The procedural setting is selected based on urgency, complexity, health status, and insurance requirements.
What are the potential benefits and risks?
A successful PCI can improve blood flow and relieve angina. In an acute heart attack, prompt intervention can limit heart damage and save life.
Potential complications include bleeding, artery injury, contrast reaction, kidney injury, abnormal rhythm, heart attack, stroke, emergency surgery, and death. Serious complications are uncommon in elective cases but cannot be reduced to zero.
Dr. Patel discusses the likely benefit, alternatives, and case-specific risk before an elective procedure.
What happens after a stent?
The access site and circulation are monitored during recovery. Activity restrictions depend on wrist versus groin access and the complexity of the procedure.
Antiplatelet medication is essential after most coronary stents. Do not stop it for dental work, surgery, bruising, or another reason without coordinating with the cardiology team.
A stent treats one segment; it does not cure the tendency to form plaque. Cholesterol treatment, blood-pressure and diabetes control, tobacco cessation, cardiac rehabilitation, and follow-up remain part of care.
Frequently asked questions
Will I be awake?
Most coronary angiograms use local anesthesia and moderate sedation, so patients are drowsy but breathing on their own. The exact plan varies.
Can I go home the same day?
Many elective cases allow same-day discharge, but observation or hospitalization may be needed based on complexity, symptoms, access site, and recovery.
Does every blockage found during angiography get treated?
No. Some are best treated with medication, some require additional assessment, and some patterns are better suited to bypass surgery.
Does a coronary stent cure coronary artery disease?
No. A stent treats a selected segment. Medication and long-term control of cholesterol, blood pressure, diabetes, tobacco exposure, activity, and other risks protect the rest of the circulation.
Related heart and vascular information
- Coronary Artery Disease (CAD)
- Chest Pain
- Cardiac Stress Testing
- Cardiac CT & Coronary Calcium Scoring
Schedule an appointment
If you have a stable heart or circulation concern, request an appointment with Flow Heart & Vascular in Mesa, Arizona. Call 911 for emergency symptoms.
This page provides general education and does not replace individualized medical advice.
