Cardiac catheterisation also called coronary angiography is the most widely performed invasive cardiac procedure. A thin catheter (flexible tube) is guided through an artery in the wrist (radial approach) or the groin (femoral approach) to the coronary arteries and heart chambers, allowing the cardiologist to image the coronary arteries with contrast dye and measure pressures inside the heart. The procedure is safe in experienced hands but its invasive nature carries specific risks: access site bleeding, allergic reaction to contrast dye, stroke, and acute complications requiring immediate intervention. Patients and families must know which post-procedure symptoms are expected and which are emergencies.

What is Cardiac Catheterisation?

Performed in a specialised catheterisation laboratory (cath lab), a catheter is inserted through a sheath placed inside the artery and threaded to the coronary arteries (the blood vessels supplying the heart muscle) and heart chambers.

Contrast dye (iodine-containing fluid visible on X-ray) injected through the catheter produces real-time coronary angiograms showing artery anatomy, narrowing (stenosis), blockage, and heart chamber function. When a blocked artery is found, percutaneous coronary intervention (PCI) - coronary angioplasty can be performed in the same session: a balloon is inflated at the blockage and a metal stent (a small mesh tube) is placed to keep the artery open.

Why is Cardiac Catheterisation Performed?

Recommended when non-invasive tests are insufficient or when direct intervention is needed:

• Coronary artery disease: To confirm the location and severity of narrowed arteries in patients with angina (chest pain on exertion) or a positive stress test
• Acute coronary syndrome: Unstable angina (chest pain at rest) or myocardial infarction (heart attack) requires urgent catheterisation to identify and open the blocked artery.
• Pre-surgical assessment: It maps coronary artery anatomy before bypass surgery to guide grafting
• Heart failure evaluation: It measures chamber pressure to determine the cause and severity
• Valvular heart disease: It measures pressure gradients across abnormal valves when echocardiography (heart ultrasound) is insufficient
• Congenital heart disease: It assesses structural abnormalities and sometimes treated through catheter-based techniques.

Signs and Symptoms After Cardiac Catheterisation

Mild symptoms in the first 24 hours are expected and distinguishing these from serious complications is essential.

• Bruising at the access site: Common after radial (wrist) and femoral (groin) approaches and mild bruising without an expanding lump is normal
• Tenderness at the puncture site: Mild soreness for one to two days is normal but a firm, enlarging lump suggests haematoma (blood collecting under the skin)
• Mild fatigue: Normal for 24 to 48 hours after sedation
• Contrast dye reaction: Itching, flushing, or mild nausea after dye injection are common but severe reactions (difficulty breathing, severe rash, blood pressure drop) require immediate treatment
• Chest pain: Mild chest pain immediately after the procedure is common but new or worsening chest pain hours after discharge is a warning sign
• Thirst and mild headache: Contrast dye causes temporary dehydration and drinking water as directed resolves this

First Aid After Catheterisation Complications (Before Reaching Hospital)

Correct action at home before arriving at the hospital limits harm from post procedure complications:

• Bleeding from the access site: Apply firm, continuous pressure over the puncture for at least 15 minutes without releasing. Call emergency services if bleeding does not stop or a large expanding lump appears.
• Chest pain: Stop all activity and sit or lie down. One dose of sublingual nitrate (tablet or spray under the tongue for angina) may be given if the pain resembles prior angina. Call emergency services if pain is severe, radiates to the arm or jaw, comes with sweating or does not respond to nitrate within five minutes.
• Numbness, weakness, or speech difficulty: These suggest stroke from a dislodged clot or air bubble. Note the exact time symptoms started as thrombolysis (clot-dissolving treatment) and mechanical thrombectomy (clot removal) are time-critical within four to six hours. Call emergency services immediately and give nothing by mouth.
• Allergic reaction: Mild reactions like itching and flushing may respond to an antihistamine. Swollen throat, difficulty breathing, or collapse is anaphylaxis (life-threatening allergic response); call emergency services immediately.
• Foot or hand coldness, pallor, or numbness: Loss of circulation beyond the access site indicates the radial or femoral artery may be occluded (blocked). Do not massage. Go to the hospital immediately.

When to Seek Emergency Care After Cardiac Catheterisation

These symptoms after catheterisation require immediate emergency care:

• Uncontrolled bleeding that does not stop with firm pressure
• A rapidly expanding firm lump at the access site 
• New or worsening chest pain particularly if different from pre-procedure angina
• Breathlessness, sweating, or collapse 
• Sudden weakness, facial drooping, speech difficulty, or vision loss 
• Cold, pale, or pulseless hand or foot
• Swollen throat, difficulty breathing, or collapse 
• Fever above 38°C within 72 hours.

Emergency Treatment at the Hospital

Emergency management targets the specific complication:

• Access site haemorrhage: Manual pressure is applied immediately. A closure device (collagen plug or suture device sealing the arterial puncture) may be placed for femoral access. A large haematoma may need surgical exploration to evacuate blood and repair the vessel.
• Pseudoaneurysm: Treated by ultrasound-guided compression or thrombin injection (clotting protein injection) into the sac. Surgical repair for large or failed cases.
• Acute coronary occlusion: Emergency return to the cath lab for repeat angiography and PCI - door-to-balloon time (arrival to artery opening) should be under 90 minutes.
• Stroke management: CT brain excludes haemorrhagic stroke (brain bleed) before thrombolysis. Ischaemic stroke confirmed within the treatment window is treated with a clot dissolving drug. Mechanical thrombectomy (catheter based clot removal) is performed within six hours.
• Contrast-induced nephropathy (kidney injury from dye): Creatinine (a kidney function marker) rises 24 to 72 hours after contrast. Managed with IV fluids and avoidance of nephrotoxic drugs until kidney function recovers.
• Anaphylaxis: Adrenaline 0.5 mg intramuscularly is first line. Antihistamines and corticosteroids follow. High-flow oxygen and IV fluids support blood pressure. Patients with severe reactions require intensive care monitoring and advanced life support measures.

What Not to Do

These actions increase complication risk after catheterisation:

• Do not remove or loosen the pressure bandage or radial compression device before the specified time 
• Do not lift, strain, or exert for at least 24 hours after femoral access 
• Do not drive for at least 24 hours as sedation and contrast dye impair reaction time.
• Do not ignore a cold, pale or numb hand or foot 
• Do not take NSAIDs without checking as they raise bleeding risk and impair kidney function after contrast.

Conclusion

Cardiac catheterisation is safe at experienced centres but certain complications (though uncommon) can be serious. The most dangerous errors are not clinical but they are patients failing to recognise warning signs and act promptly. At CARE Hospitals, every patient receives written post-procedure instructions, emergency contact numbers and clear guidance on which symptoms need immediate attention. The cath lab team is available around the clock and the emergency department escalates catheterisation complications without delay.

FAQs

1. Is cardiac catheterisation a major procedure?

Cardiac catheterisation is a minimally invasive procedure performed under local anaesthesia and light sedation. It is performed through a small blood vessel in the wrist or groin and typically allows a relatively quick recovery.

2. What are the risks of cardiac catheterisation?

Common complications are:

• Access site bleeding
• Pseudoaneurysm
• Contrast-induced kidney injury
• Allergic reaction
• Arterial occlusion
• Stroke
• Heart attack or arrhythmia (rare).

3. What should I do if there is bleeding after the procedure?

Apply firm pressure over the puncture for at least 15 minutes without releasing, add more dressing if soaked through and call emergency services if bleeding does not stop or an expanding lump appears.

4. Is chest pain after cardiac catheterisation normal?

Mild chest discomfort immediately after is common but new pain hours after discharge or severe pain, radiating to the arm or jaw with sweating may indicate stent thrombosis (clot in the stent) or myocardial infarction and requires immediate emergency assessment.

5. When should I seek emergency care after catheterisation?

Uncontrolled bleeding, expanding access site lump, chest pain, breathlessness, neurological symptoms, cold or pulseless hand or foot, severe allergic reaction or fever above 38°C within 72 hours all require immediate emergency care.

CARE Medical Team