Intravascular Imaging with IVUS and OCT
How IVUS and OCT show coronary plaque and stent detail that angiography alone may not reveal.
IVUS and OCT are catheter-based imaging methods used inside coronary arteries. IVUS uses ultrasound and penetrates deeply into the vessel wall. OCT uses near-infrared light and provides very high-resolution images of the lumen and stent surface, but requires temporary blood clearance with contrast.
Clinical Uses
Intravascular imaging can clarify ambiguous lesions, assess left-main or complex anatomy, measure vessel size, identify calcification and guide stent length and diameter. After stenting it can detect under-expansion, malapposition, edge problems or tissue prolapse that may not be obvious on angiography.
Choosing the Method
IVUS is often advantageous for large vessels, deep wall assessment and situations where contrast should be limited. OCT provides finer surface detail and can help characterise plaque mechanisms. The choice depends on the clinical question, anatomy, kidney function, haemodynamic stability and operator experience.
Imaging supports, but does not by itself determine, whether a lesion requires treatment.
Patient Selection and Procedural Planning
The procedure is considered only when the expected diagnostic or therapeutic benefit is meaningful for the individual patient. Anatomy, prior imaging, symptoms, rhythm or haemodynamic findings, kidney function, bleeding and vascular risk, medicines and reasonable alternatives are reviewed before consent.
Technical Goals and Limitations
Procedural success requires a defined endpoint, but an immediate technical result does not guarantee permanent symptom relief or eliminate the underlying cardiovascular disease. Complex anatomy, previous procedures and associated disease can change technique, success probability and complication risk.
Risks and Safety
Potential risks vary by procedure and may include bleeding or vascular injury, cardiac perforation, rhythm or conduction disturbance, contrast or kidney effects, stroke, infection and the need for urgent additional treatment. The treating team explains the risks that are specifically relevant to the planned approach.
Recovery and Follow-up
Written instructions should cover access-site or wound care, medicines, driving, work, physical activity and warning signs. Follow-up confirms the procedural endpoint, symptom response and any required imaging or rhythm monitoring. Never stop antithrombotic or rhythm medicine without a procedure-specific plan.
Questions to Ask Before the Procedure
- What precise problem is the procedure intended to solve?
- What alternatives are reasonable in my situation?
- What is the expected success rate and the most relevant personal risk?
- What follow-up and medicines will be needed afterwards?
Medical Information Note
This information supports, but does not replace, the individual consent discussion with the treating cardiovascular team.