Posterior Nasal Neurectomy for Intractable Postnasal Drip: A Surgeon's Guide
- 17 hours ago
- 8 min read
Written by Mr Tim Biggs | Consultant ENT Surgeon | Rhinology & Facial Plastics
When a Runny Nose Becomes a Medical Problem
Most people will experience a runny nose from time to time — during a cold, in cold air, or with seasonal hayfever. But for a significant number of patients, excessive nasal secretion and postnasal drip (PND) is a daily, often relentless problem that disrupts sleep, affects concentration, causes chronic throat-clearing, and significantly impairs quality of life.
When symptoms persist despite thorough medical treatment — including allergen avoidance, antihistamines, nasal steroid sprays, ipratropium bromide, and in appropriate cases, immunotherapy — the condition is classified as intractable or refractory rhinorrhoea. At this stage, surgery becomes a meaningful option.
In my practice as a rhinology and facial plastics specialist in Hampshire, I see many patients who have reached this point. For carefully selected individuals, posterior nasal neurectomy (PNN) is, in my view, the most effective and durable surgical treatment available.
Understanding the Anatomy: Why Does the Nose Overrun?
The nasal mucosa produces mucus continuously — this is normal and essential for warming, humidifying, and filtering inspired air. Mucus production is largely regulated by the parasympathetic nervous system, specifically branches of the vidian nerve that travel through the sphenopalatine ganglion (SPG) and reach the nasal mucosa via the posterior nasal nerves.
In patients with intractable rhinorrhoea, this parasympathetic drive is pathologically overactive. The result is excessive, watery mucus that either drips from the nose or accumulates at the back of the throat as postnasal drip. No amount of topical treatment can fully counteract this neurogenic overactivity — which is precisely why surgery targeting the nerve supply can offer relief that medications cannot.
What is Posterior Nasal Neurectomy?
Posterior nasal neurectomy (PNN) — also referred to as posterior nasal nerve division or selective vidian neurectomy — is a surgical procedure that interrupts the parasympathetic nerve supply to the nasal mucosa at the level of the posterior nasal nerves.
The procedure is performed entirely endoscopically, under general anaesthetic, with no external cuts or visible scarring. Through the nostril, I identify and divide the posterior nasal nerve branches as they emerge from the sphenopalatine foramen and fan out across the posterior nasal wall. This selectively reduces parasympathetic drive to the mucous glands of the nose, substantially decreasing secretion volume.
Critically, the procedure is targeted. Unlike vidian neurectomy — which risks drying of the eye through disruption of lacrimal fibres — posterior nasal neurectomy is performed distal to the sphenopalatine ganglion, preserving ocular parasympathetic function.
The Role of the Biodesign Graft in Preventing Recurrence
One of the key challenges with posterior nasal neurectomy has historically been the potential for nerve regeneration. Like all peripheral nerves, the posterior nasal nerves can regrow over time. When this occurs, symptoms of rhinorrhoea can return — sometimes within months to a few years of surgery.
To address this, I routinely use a biodesign graft (a biologic acellular collagen matrix) to cap the sphenopalatine foramen following nerve division. This small piece of regenerated tissue scaffold acts as a physical barrier at the foramen, obstructing the anatomical pathway through which regenerating nerve fibres would otherwise regrow and reinnervate the mucosa.
Clinical experience and evolving evidence suggest that interposing a biologic barrier at the foramen significantly reduces the rate of symptom recurrence compared with nerve division alone. The graft is biocompatible, gradually integrates with surrounding tissue, and does not require removal. It adds minimal time to the procedure but meaningfully improves its durability.
For patients who have suffered for years and wish to maximise their chances of long-term relief, this additional step makes a material difference to the outcome.
Who is a Candidate for Posterior Nasal Neurectomy?
Not every patient with a persistent runny nose requires or is suited to surgery. Appropriate selection is essential. I consider PNN in patients who:
• Have chronic, predominantly watery rhinorrhoea or postnasal drip lasting more than 12 weeks
• Have failed adequate medical therapy — including nasal steroid sprays, antihistamines (if allergic), and ipratropium bromide nasal spray
• Have had a thorough rhinological assessment including nasal endoscopy to exclude sinonasal pathology such as polyps, CSF leak, or anatomical obstruction
• Have predominantly non-allergic or mixed rhinitis (though allergic rhinitis patients unresponsive to immunotherapy may also benefit)
• Are medically fit for a short general anaesthetic
I do not recommend PNN as a first-line treatment. It is a well-considered surgical option for patients whose symptoms genuinely fail to respond to conservative measures and whose quality of life remains significantly impaired.
How Does PNN Compare to ClariFix for nasal drip?
ClariFix is a cryotherapy device that delivers cryogenic cooling to the posterior nasal wall and sphenopalatine ganglion region, aiming to disrupt the parasympathetic nerve signal through cold-induced nerve injury rather than surgical division. It can be performed in clinic under local anaesthetic, which is an advantage in patients who wish to avoid general anaesthesia.
However, in my clinical experience, ClariFix produces less consistent and less durable results than posterior nasal neurectomy. The mechanism relies on cryoneuromodulation — temporary disruption of nerve conduction — rather than anatomical nerve division. Many patients experience meaningful symptom improvement initially, but recurrence rates are higher and the long-term effect less predictable.
My view is as follows:
• ClariFix is a reasonable first-step surgical option for patients who wish to avoid general anaesthetic, or as an intermediate step before considering PNN
• Posterior nasal neurectomy with biodesign graft interposition remains my preferred definitive treatment for intractable rhinorrhoea, offering more durable relief
• The two procedures are not mutually exclusive — ClariFix does not preclude subsequent PNN if results are insufficient
I discuss both options transparently with every patient so they can make an informed decision that reflects their priorities and circumstances.
What Happens During and After Surgery?
The Operation
PNN is performed under general anaesthetic and takes approximately 1 hour. It is typically performed as a day-case procedure. Using an endoscope passed through the nostril, I identify the sphenopalatine foramen and the posterior nasal nerve branches, divide them under direct vision, and place the biodesign graft to cap the foramen. No nasal packing is used — patients find recovery significantly more comfortable as a result. I also combine this with a reduction of the inferior turbinates, which improves breathing and helps control symptoms better longterm.
Recovery
Most patients go home the same day. There is usually some mild nasal congestion and blood-stained discharge for the first week or two. I advise saline douching from the first post-operative day to keep the nasal cavity clean and promote healing. Most patients return to normal activity within one to two weeks, though strenuous exercise should be avoided for the first two weeks.
Results
Published evidence and my own clinical experience suggest that the majority of patients undergoing posterior nasal neurectomy experience a significant and sustained reduction in rhinorrhoea. Many describe the improvement as transformative after years of debilitating symptoms. The addition of the biodesign graft aims to preserve these gains over the longer term.
As with all surgery, outcomes are not guaranteed, and a minority of patients experience incomplete or gradually recurrent symptoms. I discuss this candidly at consultation.
Risks and Considerations
Posterior nasal neurectomy is a safe procedure in experienced hands, but no surgery is entirely without risk. Potential risks I discuss with patients include:
• Temporary nasal dryness or crusting as the mucosal glands adapt (usually settles within weeks to months)
• Bleeding — risk is low and managed intraoperatively; significant post-operative haemorrhage is uncommon
• Incomplete symptom resolution or symptom recurrence over time
• Numbness of the hard palate — can occur due to proximity of the greater palatine nerve; usually temporary
• General anaesthetic risks — low in otherwise healthy individuals
Serious complications such as orbital or intracranial injury are extremely rare in endoscopic surgery performed by an experienced rhinologist and are not specific to this procedure.
How to Arrange a Consultation
If you are suffering from persistent rhinorrhoea or postnasal drip and feel that you have exhausted conservative options, I would be happy to assess you in clinic. A comprehensive rhinological assessment — including nasal endoscopy — will determine whether posterior nasal neurectomy or another intervention is appropriate for you.
I see patients privately at Adnova Clinic in Fareham and at Medicana Hospital in Winchester.
To arrange a private consultation, please contact my secretary Michele Hewlett. Current consultation and surgical fees are listed on the Hampshire ENT Clinics website at www.hampshireentclinics.co.uk. Please also contact your insurance company for further assessment or treatment.
Michele Hewlett — Secretary to Mr Tim Biggs
Website: www.timbiggs.co.uk | www.hampshireentclinics.co.uk
Frequently Asked Questions
What is posterior nasal neurectomy?
Posterior nasal neurectomy is a minimally invasive endoscopic operation that reduces the parasympathetic nerve supply to the nasal mucosa by dividing the posterior nasal nerve branches. This significantly decreases mucus overproduction and provides long-term relief from intractable rhinorrhoea (runny nose) and postnasal drip.
How is posterior nasal neurectomy different from vidian neurectomy?
Vidian neurectomy divides the vidian nerve more proximally, within or near the sphenopalatine ganglion, and carries a risk of disrupting lacrimal (tear) secretion, potentially causing a dry eye. Posterior nasal neurectomy is performed distal to the ganglion, targeting only the branches that supply the nasal mucosa. This makes it a safer and more targeted procedure with a lower risk of ocular side effects.
What is a biodesign graft and why is it used?
A biodesign graft is an acellular biologic collagen matrix used to physically cap the sphenopalatine foramen after nerve division. Its purpose is to act as a barrier to nerve regrowth, reducing the chance of symptom recurrence that can occur when divided posterior nasal nerves regenerate over time. Using this graft is an important step in maximising the durability of the procedure.
Is the operation performed under general anaesthetic?
Yes. Posterior nasal neurectomy is performed under general anaesthetic. It is usually a day-case procedure, meaning most patients go home the same day. The operation itself typically takes around 1 hour.
How long does recovery take?
Most patients return to light activity within a few days and to normal daily life within one to two weeks. Strenuous exercise is avoided for two weeks. There may be mild nasal congestion and blood-stained discharge in the first week, which is normal. Nasal saline douching is advised from day one to support healing.
The majority of patients experience a significant and sustained reduction in rhinorrhoea following the procedure. Many describe the improvement as life-changing after years of refractory symptoms. No procedure can guarantee a complete cure, and a minority of patients experience partial improvement or gradual recurrence, but results are generally better and more durable than with ClariFix cryotherapy.
What is ClariFix and how does it compare?
ClariFix is a cryotherapy device used to cool and disrupt the posterior nasal nerve signal, reducing runny nose symptoms. It can be performed in a clinic setting under local anaesthetic, which suits patients wishing to avoid general anaesthesia. However, it produces less durable results than posterior nasal neurectomy in most cases. It is a reasonable first-step option and does not prevent subsequent neurectomy if results are insufficient.
Do I need a referral from my GP?
For private consultations, a GP referral is not required, though it is helpful to have relevant medical history and any prior investigations available.
Where does Mr Tim Biggs perform this surgery?
Mr Biggs performs posterior nasal neurectomy privately at Medicana Hospital in Winchester, Hampshire.
How do I find out the cost?
Consultation and surgical fees are available on the Hampshire ENT Clinics website at www.hampshireentclinics.co.uk. To book a consultation or ask about pricing, please contact Michele Hewlett, Mr Biggs's secretary.
