PCI vs Cardiac Catheterization
The key difference is purpose: a diagnostic cardiac catheterization finds the problem, while percutaneous coronary intervention (PCI) fixes it — opening a blocked artery with a balloon and usually a stent.
The short answer
Educational information, not medical advice.
Side-by-side comparison
| Diagnostic cath | PCI | |
|---|---|---|
| Purpose | Find blockages | Treat blockages |
| Tools | Catheters, contrast, imaging | Balloon, stent, wires (± FFR/IVUS) |
| Result | A diagnosis / road map | Restored blood flow |
| Aftercare | Standard cath recovery | Dual antiplatelet therapy to prevent stent thrombosis |
Learn more in the PCI & interventions practice bank.
Why they often happen together
If a diagnostic cath reveals a flow-limiting blockage, the team can proceed directly to PCI without a second procedure — sometimes guided by physiologic measurements like FFR. This "ad hoc PCI" saves time and an extra arterial access.
Frequently asked questions
What is the difference between PCI and cardiac catheterization?
Cardiac catheterization (with angiography) is diagnostic — it locates blockages. PCI is therapeutic — it opens a blockage with a balloon and stent.
Is PCI the same as angioplasty?
Angioplasty (ballooning the artery) is the core of PCI; PCI usually also includes placing a stent and may use FFR or IVUS guidance.
Can PCI be done during a diagnostic cath?
Yes. If a significant blockage is found, PCI is frequently performed in the same session (ad hoc PCI).
Do you need medication after PCI?
Yes — dual antiplatelet therapy (aspirin plus a P2Y12 inhibitor) is prescribed to prevent stent thrombosis.
Sources & further reading
- Cardiovascular Credentialing International (CCI)
- American College of Cardiology
- American Heart Association
- MedlinePlus (U.S. National Library of Medicine)
External links are provided for reference; always confirm current details with the official source.