Coronary angiography uses contrast dye and X-ray imaging to check for blockages in the heart arteries. Let us see why the test is done, how to prepare for it, what happens step by step, what the results mean, and what your treatment options are based on the findings.
If your doctor has recommended an angiography, it is natural to feel nervous. But this is one of the most common and safest cardiac tests performed in India, with a complication rate of under 2 percent at centres with experienced personnel.
We explain everything about coronary angiography, from the reason it is recommended to what the results mean for your treatment.
What Is Coronary Angiography?
Coronary angiography, also called a coronary angiogram, is a diagnostic test that creates detailed X-ray images of the arteries supplying the heart. A thin, flexible tube called a catheter is guided to the opening of the coronary arteries. Contrast dye is then injected through the catheter, and a special X-ray camera captures real-time images of the blood flowing through those arteries. Any narrowing or blockage is clearly visible.
Angiography vs. Angioplasty: The Key Difference
Angiography is a diagnostic test. It tells the doctor where blockages are and how severe they are. Angioplasty is a treatment. If a significant blockage is found during an angiography, the cardiologist may proceed to open the blocked artery using a balloon and stent during the same session. For a detailed comparison, see the guide on angiogram vs. angioplasty.
Radial vs. Femoral Access
• Radial (wrist) access: it is the most common approach in India today. Safer, more comfortable, and allows same-day discharge in most cases.
• Femoral (groin) access: used when radial access is not suitable. Requires a longer period of rest after the procedure and may involve an overnight stay.
Why Is Angiography Done?
A cardiologist recommends a coronary angiogram in the following situations:
• Chest pain or angina that does not respond to medicines and requires investigation to identify the cause
• An abnormal result on a stress test, ECG, or echocardiogram that suggests reduced blood flow to the heart
After a heart attack, to assess which artery was blocked and whether other arteries are also affected
• Before a cardiac surgery, to map the coronary arteries and plan the surgical approach
• Suspected coronary artery disease in patients with multiple risk factors such as diabetes, high blood pressure, and a strong family history
An angiography is also part of the workup for interventional cardiology procedures such as angioplasty and stenting, as it provides the roadmap the cardiologist needs before any intervention.
How to Prepare for Angiography
Preparation is straightforward. Following these steps carefully ensures the procedure goes smoothly and reduces the risk of complications.
• Fast for 6 hours to 8 hours before the procedure. Water is permitted up to 2 hours before the procedure in most cases, but confirm with your doctor.
• Stop blood thinners such as warfarin if your doctor instructs you to. Aspirin and clopidogrel are usually continued unless specifically told otherwise.
• Inform your doctor about any allergies, particularly to iodine or contrast dye, kidney problems, or diabetes. These conditions require specific precautions.
• Arrange for someone to accompany you and take you home. You will not be able to drive for at least 24 hours after the procedure.
• Wear comfortable, loose clothing and leave jewellery at home. You will be asked to change into a hospital gown before the procedure.
Step by Step: What Happens During the Procedure
The procedure typically takes 30 minutes to 60 minutes. Here is exactly what to expect:
• You are taken to the catheterisation laboratory, or cath lab, and positioned on an X-ray table. A monitoring team is present throughout the procedure.
• Local anaesthesia is injected at the access site, either the wrist or groin, to numb the area. You will be awake throughout but will not feel any pain.
• A small sheath is inserted into the artery at the access site. The catheter is then threaded through the sheath and guided to the opening of the coronary arteries using X-ray imaging.
• Contrast dye is injected through the catheter. You may feel a brief warm or flushing sensation when the dye is injected. This lasts only a few seconds and is completely normal.
• The X-ray camera captures real-time images, called fluoroscopy, from multiple angles. The cardiologist reviews the images immediately to assess the arteries.
• Once imaging is complete, the catheter and sheath are removed. Pressure is applied to the access site to stop bleeding. A closure device is used for femoral access.
The procedure is generally well tolerated. Most patients describe it as much less uncomfortable than they expected.
What Happens After Angiography?
Recovery in the Hospital
• After the procedure, you rest in a recovery area for 4 hours to 6 hours. Your heart rate, blood pressure, and the access site are monitored throughout.
• With the radial (wrist) approach, most patients are discharged the same day, usually within 4 hours to 6 hours after the procedure.
• With the femoral (groin) approach, the access site requires a longer compression period. An overnight stay is sometimes recommended.
Instructions for the First 24 Hours
• Drink 2 litres to 3 litres of water or clear fluids during the day of and the day after the procedure to help flush the contrast dye out through the kidneys.
• Do not drive for at least 24 hours after the procedure.
• Keep the access site clean and dry. Watch for any swelling, bleeding, or bruising at the wrist or groin.
• Avoid heavy lifting or strenuous activity for 48 hours.
• Your cardiologist will discuss the results with you on the same day or the following morning, depending on the time of the procedure.
What Do the Results Mean?
The angiography results determine the next step in your care. The table below explains the four most common findings and what each one means for treatment.
| Finding | What It Means | Recommended Next Step |
| Normal coronary arteries | No significant blockages are present | Reassurance, risk factor management, and monitoring |
| Mild blockage (less than 50%) | Narrowing is present but not severe enough to restrict blood flow significantly | Medicines to stabilise the plaque and lifestyle changes |
| Significant blockage (50% to 90%) | Blood flow to the heart muscle is restricted and causing symptoms | Angioplasty and stent placement to open the artery |
| Multiple or complex blockages | Several arteries are significantly blocked, often involving the left main artery | Bypass surgery (CABG) may give a better long-term outcome than angioplasty |
If angioplasty is recommended based on your results, the angioplasty procedure can often be performed in the same session, avoiding the need for a second procedure and a second catheter insertion. If bypass surgery is recommended, your cardiologist will refer you to a cardiac surgery team to plan the next steps.
Is Angiography Safe?
Coronary angiography is one of the most well-established and safest cardiac procedures performed today. At experienced centres, the overall complication rate is under 2 percent and the mortality risk is under 0.08 per cent. These figures are significantly lower than the cardiac risk of leaving significant coronary artery disease undiagnosed and untreated.
The most common minor complications are bruising or swelling at the access site, which resolve on their own within a few days. More serious but rare complications include an allergic reaction to the contrast dye, a small risk of damage to the artery, and temporary strain on the kidneys from the contrast agent in patients with pre-existing kidney disease.
All of these risks are minimised by choosing an experienced centre with a dedicated cath lab, using the radial access approach where possible, and screening for dye allergies and kidney issues before the procedure. Understanding the difference between non-invasive and invasive cardiology helps set the right expectations about what level of preparation and monitoring is involved.
Frequently Asked Questions
Is angiography painful?
No. Local anaesthesia numbs the access site completely before the catheter is inserted. You may feel mild pressure when the catheter is positioned, and a brief warm or flushing sensation when the contrast dye is injected. Most patients find the procedure far less uncomfortable than they expected.
How long does the result take?
The cardiologist reviews the angiography results in real time during the procedure. A verbal summary is typically provided on the same day. A written report is usually available within 24 hours. If further treatment such as angioplasty is required, your cardiologist may discuss the plan before you leave the recovery area.
Can angiography be done for elderly patients?
Yes. Age alone is not a contraindication for cardiac catheterisation. Elderly patients with chest pain or suspected coronary artery disease benefit from angiography just as younger patients do. The procedure is tailored to each patient’s specific health status. The cardiologist will assess kidney function, use of medication, and overall fitness before proceeding.
What is the difference between angiography and angioplasty?
Angiography is a diagnostic test that shows where blockages are. Angioplasty is a treatment that opens those blockages using a balloon and stent. Angiography always comes first and is used to decide whether angioplasty, bypass surgery, or medicines are the right treatment. In some cases, both are performed in the same session. See the full comparison in the angiogram vs. angioplasty guide.
How much does angiography cost in Mumbai?
The cost of angiography in Mumbai typically ranges from Rs 15,000 to Rs 40,000 depending on the hospital, the type of imaging used, and whether the procedure is elective or emergency. Most health insurance policies cover coronary angiography when it is medically indicated. Confirm coverage and pre-authorisation requirements with your insurer before the procedure.
Riverside B&J Hospital’s cath lab offers coronary angiography with advanced imaging guidance. Our expert cardiologists explain your results clearly and recommend the best next steps for your heart health.
