THE RFA PROCEDURE
WHAT TO EXPECT BEFORE, DURING, AND AFTER
Understanding what will happen at each stage of your RFA procedure โ preparation, the procedure itself, and the recovery โ helps reduce anxiety and allows you to plan your recovery effectively.
analyticsAt a Glance
- check_circleFasting from midnight; arrive morning; conscious sedation โ not general anaesthesia for most
- check_circleProcedure: 1โ3 hours total including setup, ablation, and immediate imaging
- check_circleSame-day discharge in most cases โ overnight stay for complex cases or complications
- check_circlePost-ablation syndrome (flu-like symptoms) expected for 3โ7 days โ normal and manageable
Before Your RFA: Preparation
Good preparation starts several days before your procedure date. Following these steps carefully ensures the procedure can proceed safely.
- 1
Medications: What to Stop and When
Blood thinners (anticoagulants): warfarin typically stopped 5 days before; direct oral anticoagulants (apixaban, rivaroxaban, dabigatran) stopped 24โ48 hours before. Aspirin: usually stopped 5โ7 days before; discuss with your team whether bridging anticoagulation is needed. NSAIDs: stopped 3โ5 days before. Metformin: often held 24 hours before and 48 hours after contrast CT. Do NOT stop medications without explicit instruction from your treating team.
- 2
Fasting: Food and Drink
No solid food for 6 hours before the procedure. Clear fluids (water, black tea, black coffee โ no milk) allowed until 2 hours before. Nothing by mouth in the 2 hours immediately before. These rules prevent aspiration of stomach contents during sedation. If you take morning medications with water, ask your team whether they can be taken with a sip of water on the procedure morning.
- 3
Logistics: Transport and Companion
Arrange for someone to drive you home โ you will not be able to drive after conscious sedation. Most centres recommend an adult companion who can stay with you for the first 24 hours at home. Bring a list of all your medications and allergies to the procedure. Wear comfortable, loose clothing that allows access to the abdomen, back, or flank as appropriate for your tumour location.
- 4
Pre-Procedure Blood Tests
Typically required within 2 weeks of your procedure: full blood count, INR/coagulation screen, renal function (creatinine/eGFR), liver function tests. These confirm that your blood is safe to clot (platelets, INR), that contrast dye can be used (eGFR), and that liver function is adequate (for liver procedures). Results are reviewed by the proceduralist before scheduling.
During Your RFA: What Happens
A typical CT-guided liver, kidney, or lung RFA procedure โ the most common types CancerFax patients access.
- 1
Arrival and Setup (30โ45 Minutes)
Check in at interventional radiology. IV cannula inserted in your arm. Pre-medication given (often IV antibiotics and a mild anxiolytic). You are positioned on the CT table โ typically prone (face down) for liver or kidney tumours, or a position depending on your tumour location. Grounding pads placed on your legs or back. Skin cleaned and draped. Monitoring attached: ECG, pulse oximeter, blood pressure cuff.
- 2
Conscious Sedation
Most RFA procedures are performed under conscious sedation โ not full general anaesthesia. Typically midazolam (relaxant) + fentanyl or alfentanil (pain relief) given through your IV cannula. You remain comfortable and drowsy but able to follow instructions (breathe in, breathe out, hold your breath). An anaesthesiologist or nurse anaesthetist monitors you throughout. You will have little or no memory of the procedure.
- 3
Needle Placement Under CT (20โ40 Minutes)
The interventional radiologist advances the electrode needle through your skin toward the tumour. You will hear the CT scanner table moving in and out as they take repeated scans to check the needle position. You may be asked to hold your breath briefly at certain moments. The needle passes through your skin โ you should feel only pressure, not pain.
- 4
The Ablation (10โ25 Minutes)
Once the electrode is in position, energy is delivered. You will feel nothing โ the tissue inside your body has no sensation under sedation. The generator hums quietly. The procedure team monitor temperature and impedance readings on the RFA console. For tumours requiring multiple electrode positions, the needle is repositioned 2โ4 times.
- 5
Post-Procedure CT (10โ15 Minutes)
After the electrode is removed, a final CT confirms the ablation zone size and checks for immediate complications (haemorrhage, pneumothorax for lung cases). You remain on the table while this is reviewed. The team discusses the result: "The ablation zone covers the tumour with a good margin" is what you hope to hear.
After Your RFA: Recovery and Post-Ablation Syndrome
Most patients feel surprisingly well within hours of RFA โ but the post-ablation syndrome that develops in the following days is expected and should not cause alarm.
Immediate Recovery (2โ6 Hours)
Recovery in the post-procedure observation area. Monitoring continues until sedation has fully worn off (typically 1โ3 hours). Pain at the needle entry site โ manageable with paracetamol. Nausea in some patients from the sedation medication. Vital signs checked every 30 minutes. Oral fluids and light food once fully awake. Most patients discharged home the same afternoon.
Post-Ablation Syndrome (Days 1โ7): Expected
Post-ablation syndrome โ a predictable response to tumour necrosis โ affects 50โ80% of patients: low-grade fever (37.5โ38.5ยฐC), fatigue, flu-like malaise, and mild localised discomfort at the ablation site. This is a sign the ablation worked โ your immune system is responding to the necrotic tissue. Managed with paracetamol every 6 hours as needed. Usually resolves by day 5โ7.
Diet and Activity
Diet: normal food tolerated immediately for most patients. For liver procedures, avoid alcohol for 2โ4 weeks to minimise liver stress. Activity: light activity the day after procedure; avoid strenuous exercise for 1 week (liver procedures) or 2 weeks (kidney/lung). Driving: no driving for 24 hours after conscious sedation; resume when fully alert and comfortable.
When to Seek Urgent Help
Seek emergency care immediately for: temperature above 38.5ยฐC persisting beyond day 7 or rising after initial improvement (may indicate infection); significant increasing pain, especially pleuritic chest pain or severe right upper quadrant pain; shortness of breath developing after lung procedure (possible pneumothorax); visible bleeding at needle entry site; yellowing of skin or eyes (jaundice, relevant for liver procedures).
Recovery Timeline by Tumour Location
Recovery expectations differ somewhat by which organ is treated.
| Organ Treated | Hospital Stay | Return to Work | Driving | Key Restriction |
|---|---|---|---|---|
| Liver | Same day or 1 night | 3โ7 days (desk work); 1โ2 weeks (physical) | 24 hours after sedation | No alcohol 4 weeks; avoid contact sports 2 weeks |
| Kidney | Same day or 1 night | 3โ5 days (desk); 1โ2 weeks (physical) | 24 hours after sedation | No strenuous lifting for 2 weeks |
| Lung | Same day or 1 night (longer if chest tube placed) | 5โ7 days (desk); 2 weeks (physical) | 24 hours (or until chest tube removed) | Return urgently if breathlessness develops |
| Bone (with cementoplasty) | 1 night typically | 3โ7 days (desk); variable for physical | 24โ48 hours | Follow physiotherapy guidance for weight-bearing |
| Osteoid Osteoma | Same day | 3โ5 days (desk); 1โ2 weeks (physical) | 24 hours | Avoid impact on treated bone for 2 weeks |
Follow-Up: How Your Response Is Assessed
Knowing what your follow-up will involve โ and what "complete ablation" means โ helps you interpret the results you receive.
The 4โ6 Week Follow-Up Scan
A contrast-enhanced CT or MRI at 4โ6 weeks after your procedure assesses whether the ablation was complete. "Complete ablation" means: the ablation zone encompasses the entire original tumour with a margin, and there is no enhancement (no blood flow) within the treated area on contrast imaging. Enhancement = viable tumour = incomplete ablation, requiring a plan for repeat treatment.
Long-Term Surveillance
After confirmed complete ablation: CT or MRI every 3 months for 2 years, then every 6 months thereafter (for most cancer indications). Each surveillance scan looks for local recurrence (regrowth at the ablation site) and new lesions (new tumours in the same organ or elsewhere). New lesions are a separate problem from local recurrence and may be treatable with additional ablation.
Explore the RFA Knowledge Base
Related RFA topics and resources.
Frequently Asked Questions
Common patient questions about the RFA experience.
Practical Preparation
Can I have my usual breakfast if my procedure is in the afternoon?
Fasting rules apply regardless of procedure time: no solid food for 6 hours before the procedure. If your procedure is at 2 PM, your last meal should be by 8 AM. Clear fluids (water only, no milk or juice) are allowed until 2 hours before the procedure start time. Follow your specific centre's instructions exactly โ they may have slightly different protocols. When in doubt, call the interventional radiology team the day before.
Will I need to stay in hospital?
Most patients go home the same day, 4โ6 hours after the procedure. A small number of patients stay overnight โ particularly those with complex cases, those requiring chest tube for pneumothorax after lung RFA, those with very poor performance status, or those whose procedure took place late in the afternoon. Your treating team will advise you before the procedure whether overnight stay is likely.
Post-Procedure
My temperature is 38.2ยฐC on day 3 after liver RFA. Should I be worried?
Low-grade fever (37.5โ38.5ยฐC) for the first 3โ7 days after RFA is expected post-ablation syndrome โ it reflects your immune system responding to the necrotic tumour tissue. Manage with paracetamol (1g every 6 hours as needed). Seek urgent assessment if: temperature rises above 38.5ยฐC, fever persists beyond day 7, fever is accompanied by shaking chills (rigors), or you develop right upper quadrant pain or jaundice โ these may indicate abscess formation or bile duct injury requiring urgent investigation.
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Preparing for Your First RFA Procedure?
Our clinical team can answer any questions about what to expect from your specific RFA procedure โ before, during, and after. Upload your medical reports for a personalised assessment and preparation guide.
For informational purposes only. Always follow the specific preparation and post-procedure instructions provided by your treating interventional radiology team โ these take precedence over general guidance.