Follow the CT coronary angiography procedure from arrival to results: ECG stickers, heart rate control, the quick scan and what you may feel.
In CT coronary angiography, you get ECG leads and a small drip, your heart rate is checked, a nitroglycerin spray is given, and you hold your breath for a few seconds while the CT scanner takes pictures of your heart arteries. The scan takes seconds, and the visit takes 30 to 60 minutes.
Step 1: Arrival and Checks
You register, sign a consent form and answer questions about allergies, kidney disease, medicines and heart history. Your blood pressure, pulse and weight are recorded. Your recent creatinine report is reviewed. If you have not prepared well, the team may change the plan. Read CTCA preparation and heart rate before your visit.
StepWhat happensWhat you may feelECG leadsStickers placed on chestCool gel, mild tuggingIV dripSmall cannula in the armA short needle prickHeart rate checkMedicine given if heart rate is highSlower heartbeat, mild tirednessNitroglycerin spraySpray under the tongueMild headache, warm faceContrast and scanDye injected, breath-holdWarm flush, metallic tasteStep 2: ECG Leads and IV Line
You lie on the CT table on your back. Three to four ECG stickers are placed on your chest so the scanner can match pictures with your heartbeat. A thin cannula is placed in a vein of your arm, usually the right elbow, because the contrast is injected quickly. Tell the team about needle fear, so they can help you stay calm.
Step 3: Heart Rate Control
The ideal heart rate is below about 60 to 65 beats per minute. If your rate is higher, you may be given a beta-blocker. This is done only if there is no medical reason against it. Breathing slowly and staying relaxed also helps. Read how CT coronary angiography works.
Step 4: Nitroglycerin and Breath-Hold Practice
A spray of nitroglycerin under the tongue widens the heart arteries so they appear clearly. You may feel a mild headache, warmth or light-headedness for a short time. The technologist then practises breath-hold commands with you: "breathe in, hold, breathe out".
Step 5: The Scan
Contrast is injected through the cannula while the table moves. You feel a warm flush and sometimes a feeling of passing urine, but this is not real. You hold your breath for 5 to 10 seconds. The scanner rotates very fast around your chest. Sometimes a first low-dose scan of calcium is done as well. See coronary calcium score.
Step 6: After the Scan
- The cannula is removed and you rest for a few minutes.
- Drink plenty of water to help clear the contrast.
- You can eat, drive and return to normal activity, unless you had a medicine that makes you sleepy.
- Report rash, itching, swelling, chest pain or breathlessness at once.
See CTCA aftercare and CTCA risks and side effects.
Quick Summary
- Total visit time: 30 to 60 minutes
- Actual scan time: a few seconds
- Needs a vein for contrast
- Heart rate control improves the images
- Report usually ready within 24 to 48 hours
A practical tip: wear a loose top, and keep your hands relaxed on your sides or above your head as instructed. Read CTCA vs conventional angiography for a comparison.
What If the Scan Cannot Be Completed?
Sometimes the scan is postponed. This happens if your heart rate stays too high, if you have a very irregular rhythm, if your kidney report is not available, or if you cannot hold your breath. This is not a failure on your part. The team may adjust your medicine, repeat the scan on another day, or suggest a different test such as a calcium score or a stress test. Ask the team what to change next time, for example avoiding caffeine or taking a prescribed tablet earlier.
Frequently Asked Questions
How long does CT coronary angiography take?
The scan takes a few seconds. The visit takes 30 to 60 minutes.
Is the contrast injection painful?
There is a needle prick, then a warm flush for a minute.
Will I need to hold my breath?
Yes, for 5 to 10 seconds, and you are guided at each step.
Why is a spray used under the tongue?
Nitroglycerin widens the heart arteries so they can be seen clearly.
Can I move during the scan?
No. Stay still and follow breath-hold instructions.
Is it safe for me if I have a stent?
Metal stents can blur images in some cases. Your doctor will decide. See CTCA after stent or bypass.
Will I be admitted to the hospital?
No. It is an outpatient test.
Can I drive home after the test?
Yes, unless you feel dizzy.
When will I get my report?
Usually within 24 to 48 hours.
Book Your Test at Ganesh Diagnostic
Ganesh Diagnostic & Imaging Centre in Rohini, Delhi offers this test with trained radiology staff and clear reports. You can book an appointment online, check our branches across Delhi NCR, contact us for current rates, or explore all our services.
This article is for general information only. It does not replace advice from your doctor. Always follow your doctor's instructions for your test.
