Coronary Angiogram and PCI

Coronary Angiogram and PCI (Percutaneous Coronary Intervention)

A coronary angiogram +/- PCI is a procedure used to diagnose and treat narrowed or blocked coronary arteries. If your cardiologist identifies a blockage during the angiogram, they may proceed with angioplasty and/or stenting during the same session to restore blood flow. This is discussed prior to your procedure.

What is Angioplasty and Stenting?

If a narrowing or blockage is detected, your cardiologist may perform angioplasty—a procedure where a small balloon is inflated to compress the plaque against the artery wall. A stent (a tiny metal mesh tube) is usually placed to keep the artery open and maintain normal blood flow.


This treatment is less invasive than open-heart surgery and is often performed during the same session as the angiogram.

What to Expect

You will be awake but sedated during the procedure. A local anaesthetic will be used to numb the area—typically the groin or wrist—where a thin catheter is inserted often under ultrasound guidance. A canula or drip will be placed in your arm to administer medications, including a mild sedative to help you relax.


The catheter is guided into your coronary arteries under X-ray guidance. A contrast dye is injected through the catheter, and X-ray images are taken to visualise the arteries. If a blockage is found, your cardiologist may proceed with angioplasty and stenting.

More Involved Cases

In some cases, the procedure may be more complex. This can occur if:

  • The artery is split, damaged, or re-narrows after balloon inflation.
  • The narrowing is heavily calcified or difficult to access.
  • The artery has been completely blocked for some time.
  • The narrowing involves important side branches.

In these situations:

  • One or more stents may be placed using a balloon to ensure the artery remains open. The stent stays in place permanently.
  • Additional tools may be used, including:
    • Pressure wires (FFR, RFR and iFR) to assess blood flow.
    • Intravascular ultrasound (IVUS) or optical coherence tomography (OCT) for detailed intra-coronary imaging
    • Rotablation (small drill) to remove hard plaque.
    • Lithotripsy to break up blockages using sound waves.

To close the artery, a plug or stitch may be used. Your cardiologist will explain this if needed.

After stenting, you will be prescribed medications to prevent clotting. This will be discussed prior to your discharge. It is mandatory to stay on all medication as prescribed. GPs can provide repeat scripts. It is imperative to not run out of blood thinners if have you have had stents inserted.

Angioplasty and Stenting for a Heart Attack

If you are undergoing this procedure as treatment for a heart attack, outcomes depend on several factors:

  • Your age
  • Your heart pump function and how much damage has already been suffered.
  • The number of diseased arteries
  • The location of the heart attack
  • How quickly you arrive at hospital.
  • The amount blood flow in the affected artery
  • Your overall clinical condition

Fewer risk factors generally lead to better outcomes. If multiple arteries are affected, further procedures may be required.

In some cases, clot-busting medication may be considered as an alternative. Your cardiologist will discuss the risks and benefits of each option with you.

The risk of complications may be higher during emergency treatment for a heart attack. Your cardiologist will explain this in detail.

What Kind of Risks Are Associated with This Procedure?

All procedures carry some risk. Your cardiologist has carefully considered the benefits and risks in your case. Understanding these risks helps you make an informed decision.

Common Risks and Complications

  • Minor bruising at the puncture site
  • Major bruising or swelling at the puncture site.
  • Re-narrowing or blockage of the treated artery (restenosis)

Uncommon Risks and Complications

  • Abnormal heart rhythm that may require a Cardioversion
  • Loss of pulse in the wrist after radial access
  • Heart attack during or after the procedure
  • Surgical repair of the puncture site or blood vessel 

Rare Risks and Complications

  • Sudden closure of the stent in the few weeks
  • Emergency heart surgery
  • Reaction to blood-thinning medications
  • Allergic reaction to contrast dye.
  • Loss of kidney function due to contrast dye
  • Stroke
  • Rupture of a blood vessel requiring surgery and transfusion
  • Skin injury from radiation exposure
  • Increased lifetime cancer risk from X-ray exposure
  • Death (extremely rare)