Introduction
Intravascular ultrasound (IVUS) uses a tiny ultrasound probe inside a blood vessel to image the vessel wall, plaque, and stent position. It is often performed with coronary angiography.
Angiography shows blood flow as a shadow image. IVUS shows detailed cross-section of the vessel wall. In selected cases it helps improve stent sizing and placement.
Why this test is done
Intravascular Ultrasound is commonly considered in situations such as:
- Understanding severity and nature of coronary artery narrowing
- Confirming stent size and full expansion
- Clarifying ambiguous angiography findings
- Evaluating bypass grafts or peripheral arteries when indicated
- Supporting precise intervention in complex lesions
How the test is done
- In a catheter lab, a sheath is placed in the wrist or groin under local anesthesia
- IVUS catheter images are acquired during or after contrast angiography
- Vessel diameter, plaque, and stent details are reviewed on a monitor
- Angioplasty or stenting may be done in the same session if needed
Preparation and precautions
- Follow fasting and medicine instructions, especially for blood thinners and diabetes drugs
- Report contrast allergy, kidney disease, and pregnancy
- Do not stop aspirin or antiplatelet drugs unless your cardiologist advises
- Arrange a ride home; driving the same day may be discouraged
Understanding results
Your clinician interprets lab or imaging ranges together with your symptoms. Online “normal values” do not always apply to your case.
- Images guide stent decisions by the interventional cardiologist
- Minimum lumen diameter, plaque burden, and malapposition can be assessed
- IVUS alone does not measure all heart attack risk
- Findings are interpreted with angiography and clinical status
Risks or limitations
- Catheter procedure risks include bleeding, infection, allergy, and vessel injury
- Rare serious events include heart attack, stroke, arrhythmia, or emergency bypass
- Contrast can stress the kidneys
- Radiation exposure comes from angiography; ultrasound itself does not use radiation
After the test
- Keep pressure on the puncture site as instructed
- Seek urgent care for bleeding, severe chest pain, or breathlessness
- Take antiplatelet and other medicines on schedule
- Attend follow-up visits
Frequently asked questions
Is IVUS the same as angiography?
No. Angiography shows the vessel lumen with contrast. IVUS shows wall and plaque detail from inside the artery.
Is IVUS needed for every angioplasty?
No. It is used when detailed wall imaging will change management.
Will I get a separate report?
Your cardiology team documents findings; formal reports vary by center.
Important caution
IVUS adds detailed vessel imaging during selected catheter procedures.
This information is general education, not personal cardiology advice.