What risks are linked with angioplasty? 

Angioplasty is a widely performed and generally safe procedure for treating Peripheral Vascular Disease (PVD) in the UK, but it does carry specific clinical risks. The most common complications occur at the site where the catheter enters the skin, typically involving bruising or a small lump called a haematoma. More serious but rare risks include damage to the artery wall, allergic reactions to the contrast dye, and the potential for blood clots or plaque to travel further down the leg. In 2026, UK clinicians use advanced imaging and precise techniques to minimize these dangers, ensuring that the benefits of restored blood flow outweigh the procedural risks. 

While angioplasty is a minimally invasive keyhole treatment, any intervention involving the arterial system requires a careful assessment of potential harms. For patients in the UK, these risks are discussed in detail during the consent process. The likelihood of a complication is often influenced by the overall health of the patient, the complexity of the arterial blockage, and the presence of other conditions such as kidney disease or diabetes. This article provides a comprehensive overview of the risks linked with angioplasty and how the vascular team manages them to ensure a safe outcome. 

What We will cover in this Article 

• Common access site complications like haematomas and bruising. 

• Risks associated with contrast dye and kidney function. 

• Mechanical risks to the artery such as dissection and rupture. 

• Systemic complications including blood clots and embolisation. 

• Long term risks like restenosis or re-narrowing of the vessel. 

• Factors that increase individual risk levels. 

• Safety monitoring and emergency protocols in UK hospitals. 

Access site complications 

The most frequent risks associated with angioplasty occur at the point where the catheter is inserted, which is usually the common femoral artery in the groin. Because this is a high-pressure vessel, bleeding is a primary concern. Most patients will experience some degree of bruising, but in about 4% of cases, a more significant collection of blood called a haematoma may form. 

Groin haematoma 

A haematoma is a firm, sometimes painful lump under the skin caused by blood leaking from the puncture site. While most resolve on their own, large ones may require a longer hospital stay or, in very rare cases, a small surgical procedure to drain the blood. 

Pseudoaneurysm 

This occurs when blood continues to leak out of the artery into the surrounding tissue but is contained in a small pocket. It can often be treated in the clinic using ultrasound guided compression or a small injection to seal the leak. 

Contrast dye and allergic reactions 

To see the arteries clearly on live X ray, a special contrast dye is injected into the bloodstream. This dye carries its own set of risks, particularly for the kidneys and the immune system. Before the procedure, UK clinicians always check your kidney function via a blood test to ensure it is safe to proceed. 

Contrast induced nephropathy 

The dye used during angioplasty can cause temporary strain on the kidneys. This risk is higher in patients who already have kidney disease or are dehydrated. Drinking plenty of fluids after the procedure is a standard clinical recommendation to help flush the dye out of your system. 

Allergic reactions 

Some patients may have a reaction to the iodine in the contrast dye. These are usually mild, such as a localized rash or itching, but the clinical team is fully equipped with emergency medications like antihistamines and steroids to treat any reaction instantly. 

Mechanical risks to the artery 

As the catheter and balloon are navigated through the narrowed vessel, there is a small chance of physical damage to the artery wall. These mechanical risks are rare but are the reason why angioplasty is performed in a sterile surgical environment. 

Arterial dissection 

A dissection is a small tear in the inner lining of the artery. While this can sometimes happen as the balloon expands the plaque, it is usually managed immediately by placing a stent to ‘tack’ the tear back against the vessel wall. 

Arterial rupture 

In extremely rare cases, the pressure of the balloon can cause the artery to burst. This is a surgical emergency that requires the immediate inflation of a special covered stent or a transition to open surgery to repair the vessel. 

Systemic and distal complications 

When a balloon or stent is used to open a blockage, there is a risk that pieces of fatty plaque or small blood clots could be dislodged. These particles can travel further down the leg (distal embolisation) and block smaller vessels in the calf or foot. 

Distal embolisation 

If plaque travels downstream, it can cause a sudden loss of blood flow to the toes. Vascular surgeons use special ‘aspiration’ catheters to suck the debris out, or they may use powerful blood thinning medications to dissolve any new clots that have formed. 

Stent misplacement 

If a stent is required, there is a very small risk that it could be deployed in the wrong position or move before it is fully expanded. UK specialists use high resolution fluoroscopy to ensure the stent is perfectly placed and securely anchored against the artery wall. 

Differentiation: Minor vs Major risks 

It is important to differentiate between the common, minor side effects and the very rare, major complications of the procedure. 

Risk Category	Examples	Frequency
Common/Minor	Bruising, mild soreness, small haematoma	5 to 10%
Uncommon	Pseudoaneurysm, mild dye reaction	1 to 2%
Rare/Serious	Arterial rupture, kidney failure, major bleeding	Less than 1%
Very Rare	Heart attack, stroke, loss of limb	Less than 0.5%

To Summarise 

While angioplasty is a safe and effective treatment for PVD, it carries risks ranging from minor bruising and haematomas to rare but serious arterial damage. Allergic reactions to contrast dye and potential kidney strain are managed through careful preoperative screening and post operative hydration. Most complications can be treated immediately during the procedure, ensuring that the risk remains low for the vast majority of patients. If you experience severe, sudden, or worsening symptoms, especially a cold, pale, or numb limb, call 999 immediately. 

Authority Snapshot 

This article was written by Dr. Rebecca Fernandez, a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. Dr. Rebecca Fernandez has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Rebecca Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being. This content followed clinical standards for the management of peripheral arterial disease and was reviewed by Doctor Stefan to ensure it meets the MyPatientAdvice 2026 framework.