WHAT TO EXPECT
DURING AND AFTER MICROWAVE ABLATION
Knowing exactly what will happen โ from the morning of your procedure through the first weeks at home โ reduces anxiety and helps you plan your recovery. This guide covers the full patient experience in honest, practical detail.
analyticsAt a Glance
- check_circleConscious sedation: comfortable throughout, no general anaesthesia in most cases
- check_circleThe ablation itself takes 5โ15 minutes; total time in suite 2โ3 hours
- check_circleLow-grade fever and fatigue for 2โ5 days after is normal โ it means treatment is working
- check_circleMost patients home same day or after one night; back to normal activities in 3โ7 days
Preparing for Your Procedure
Good preparation makes the day go smoothly. Your interventional radiology team will give specific instructions โ these are the common requirements across most centres.
The Week Before
Review your medications with your team โ blood thinners (warfarin, clopidogrel, aspirin, novel anticoagulants) are usually paused 5โ7 days before the procedure. Your most recent CT or MRI is reviewed for procedural planning. Pre-procedure blood tests confirm normal coagulation, kidney function, and blood counts. An anaesthesia pre-assessment may be required for some patients.
The Day Before and Morning Of
Fast from midnight (or 6 hours before the procedure for food, 2 hours for clear fluids โ confirm with your centre). Bring a list of all current medications. Arrange a driver โ you cannot drive after conscious sedation. Wear comfortable, loose clothing. Remove nail polish from fingers and toes (needed for pulse oximetry monitoring). Shower normally.
Your Procedure Day โ Step by Step
A typical microwave ablation procedure day, from arrival through discharge.
- 1
Arrival and Check-In (60โ90 min before procedure)
Arrive at the interventional radiology suite or day procedure unit. Nursing staff take baseline observations (blood pressure, heart rate, oxygen saturation, temperature). IV cannula inserted in your arm. Consent form signed if not done at pre-assessment. Gown changed.
- 2
Team Briefing and Final Imaging Review
Interventional radiologist reviews your imaging with you, explains the planned approach, and answers any last questions. Anaesthetist or sedation nurse meets you and reviews medical history. Final checks complete.
- 3
Sedation and Positioning
Sedation medication (usually midazolam and fentanyl, or propofol at some centres) administered through your IV. You will feel very relaxed and drowsy. Positioned on the CT or ultrasound table โ prone, supine, or lateral depending on tumour location. Monitoring leads placed.
- 4
Imaging Guidance and Antenna Placement
Local anaesthetic injected at the needle entry site. The MWA antenna is advanced through the skin to the tumour under real-time CT or ultrasound guidance. Positioning is confirmed before energy is delivered. You may feel mild pressure at the entry site.
- 5
The Ablation โ 5โ15 Minutes
Microwave energy delivered. You will feel warmth or mild pressure โ sedation keeps you comfortable. Some patients feel a brief burning sensation at the start; this is normal and short-lived. The team monitors the ablation zone forming in real time.
- 6
Confirmation Imaging and Antenna Removal
Post-ablation CT confirms complete tumour coverage and checks for immediate complications. The antenna is withdrawn while delivering a brief ablation along the tract to prevent bleeding. Pressure applied to entry site; small dressing applied.
- 7
Recovery and Discharge
Transferred to recovery. Vital signs monitored every 15โ30 minutes. IV fluids given. Most patients are well enough to go home 2โ4 hours after the procedure. Before discharge, you receive written discharge instructions, pain medication prescription, and follow-up appointment.
Post-Ablation Syndrome: Normal and Expected
Post-ablation syndrome is the most common thing patients experience after MWA. It is not a complication โ it is a normal, expected response to successful tumour destruction, and most patients experience it to some degree.
โPost-ablation syndrome feels like a mild flu. Fever, tiredness, and achiness around the treated area for a few days after ablation means your immune system is clearing the treated tissue โ exactly what it should be doing.โ
Low-Grade Fever (37.5โ38.5ยฐC)
The most common symptom. Typically begins within 4โ12 hours of the procedure and lasts 2โ5 days. Caused by the release of cell breakdown products (cytokines) from the necrotic ablated tissue triggering a systemic inflammatory response. Managed with paracetamol (acetaminophen). Fever above 38.5ยฐC, fever persisting beyond 7 days, or fever with rigors warrants medical review.
Fatigue
Tiredness is very common for the first week after ablation โ a combination of the systemic inflammatory response, the sedation residue, and the body's energy being directed to tissue clearance. Most patients need extra rest for 3โ5 days. Typically much better by the end of the first week.
Local Discomfort
Mild-to-moderate aching or pressure sensation in the treated area โ in the right upper abdomen for liver ablation, the chest for lung, or flank for kidney. Typically rated 3โ5 out of 10 and well-managed with paracetamol and/or a mild anti-inflammatory. Severe pain (7โ10 out of 10) is uncommon and warrants prompt review.
Nausea
Mild nausea is common, partly from sedation residue and partly from the systemic response. Usually improves substantially by day 2. Anti-nausea medication (ondansetron or metoclopramide) is usually prescribed to take as needed. Severe persistent vomiting is uncommon.
Reduced Appetite
Common for 3โ7 days after liver and abdominal ablation. Eat small, easily digestible meals. Normal appetite usually returns within a week. Weight loss of 1โ2 kg in the first week is common and self-corrects.
Recovery Timeline
Typical recovery milestones after microwave ablation across different organ sites.
| Timepoint | Liver MWA | Lung MWA | Kidney MWA |
|---|---|---|---|
| Day 0 (procedure day) | Discharged 2โ4 hours post-procedure; driving not permitted | Discharged same day or overnight if pneumothorax monitoring needed | Discharged same day; urine may be pink for 12โ24 hours |
| Days 1โ3 | Rest at home; low-grade fever and fatigue expected; soft diet | Rest at home; mild chest discomfort expected; no heavy lifting | Rest at home; flank discomfort expected; stay well hydrated |
| Days 3โ7 | Fever and fatigue improving; gentle walks; return to office work possible | Gradual return to normal activities; avoid strenuous exertion | Fever resolving; normal diet; light activity |
| Week 2 | Most patients back to normal activities; driving resumed | Normal activities for most; strenuous exertion still limited | Normal activities resumed; driving permitted |
| 4โ6 weeks | First follow-up CT or MRI to confirm complete ablation | Follow-up CT at 4โ6 weeks; lung function check if needed | Follow-up CT at 4โ6 weeks; renal function blood test |
| Ongoing | Surveillance imaging every 3โ6 months; AFP monitoring | Surveillance CT every 3โ6 months | Surveillance CT every 6 months; renal function annual |
When to Call Your Medical Team
Most post-ablation symptoms are expected and manageable at home. These warning signs require prompt medical contact.
Call Immediately (Emergency or Urgent)
Severe pain (7โ10/10) not responding to prescribed pain medication. Fever above 38.5ยฐC especially with shaking chills (rigors). Shortness of breath or difficulty breathing (particularly after lung MWA). Coughing up blood. Yellowing of skin or eyes (jaundice). Inability to pass urine for more than 12 hours.
Call Within 24 Hours (Non-Emergency)
Fever persisting beyond 7 days. Pain that is worsening rather than improving after day 3. Signs of infection at the needle entry site (redness, swelling, discharge). Persistent severe nausea preventing fluid intake. Any symptom that feels significantly worse than what was described at discharge.
Normal โ No Action Needed
Low-grade fever (below 38.5ยฐC) for up to 5โ7 days. Mild pain 3โ5 out of 10 at the treatment site, improving day by day. Fatigue for the first week. Mild bruising at the needle entry point. Pink urine for 12โ24 hours after kidney ablation. Mild cough for 2โ3 days after lung ablation.
Related Treatments & Resources
Explore the full microwave ablation knowledge base.
- What Is Microwave Ablation? A Patient Introduction
- Complications of Microwave Ablation: Risk and Management
- Microwave Ablation Response Assessment: CT and MRI Criteria
- Microwave Ablation for Liver Cancer (HCC): Evidence and Outcomes
- Microwave Ablation for Lung Cancer: NSCLC and Pulmonary Metastases
- Microwave Ablation โ Full Treatment Page
Frequently Asked Questions
Common questions about the microwave ablation experience.
During the Procedure
Will I be awake during the procedure?
Most patients receive conscious sedation โ you are awake but deeply relaxed and drowsy, and you will have minimal memory of the procedure. A small number of patients receive general anaesthesia (usually if very anxious, or if the procedure is particularly complex or prolonged). Discuss your preference with the team beforehand; conscious sedation is preferred as it allows communication during the procedure and avoids the risks of general anaesthesia.
Will I feel pain during the ablation?
With adequate sedation and local anaesthetic, most patients feel minimal discomfort โ mild pressure at the antenna site and sometimes a brief warmth or aching sensation when energy is delivered. Sedation medication is titrated to keep you comfortable throughout. If you feel significant discomfort, alert the team immediately โ additional sedation can be given.
How will I know if the ablation worked during the procedure?
Post-ablation CT imaging is reviewed immediately after the procedure to confirm the ablation zone covers the tumour with an adequate margin. Your doctor will discuss this with you before discharge. Complete confirmation requires follow-up imaging at 4โ6 weeks โ the immediate post-ablation scan confirms coverage but the definitive result comes from the 4โ6 week scan showing no residual tumour enhancement.
Recovery and Return to Normal
When can I drive again?
Not on the day of the procedure โ sedation affects reaction time and judgment for the rest of the day. Most patients can resume driving 24โ48 hours after the procedure, once the sedation effects have fully cleared and pain is controlled with medication that doesn't cause drowsiness. Confirm with your team before driving, particularly if the treated area or any mobility is affected.
When can I return to work?
Office or desk work: most patients return within 3โ7 days. Physical or manual labour: typically 2โ3 weeks. Some patients feel well enough to work from home by day 3โ4. Let your energy levels and pain guide you โ there is no fixed rule, and pushing too hard early can prolong recovery.
Can I eat normally after the procedure?
Start with light, easily digestible foods โ soup, toast, crackers โ on the day of discharge. Normal diet can resume as tolerated, usually by day 2โ3. For liver ablation, avoid heavy fatty meals for the first week. Alcohol should be avoided for at least 2 weeks after liver ablation. Stay well hydrated throughout recovery.
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For informational purposes only. Always follow the specific instructions given by your treating interventional radiology team.