Show notes
GERD 5: Antireflux Surgery, Magnetic Sphincter Augmentation, and Endoscopic TherapiesEpisode keywords: Nissen fundoplication GERD, Toupet partial fundoplication, laparoscopic antireflux surgery, LINX magnetic sphincter augmentation, Roux-en-Y gastric bypass GERD, sleeve gastrectomy GERD worsening, transoral incisionless fundoplication TIF, antireflux surgery outcomes, GERD surgery recurrenceEpisode SummaryFundoplication is not just a sphincter tightening. Each surgical step corrects a specific pathophysiologic defect in the antireflux barrier. This episode walks through the four steps of fundoplication and what each one does mechanically, the distinction between full and partial wraps and when each is appropriate, the critical interaction between morbid obesity and surgical choice, the LINX device's specific niche, and the evidence base for endoscopic antireflux therapies including TIF.Key TopicsFundoplication -- four steps and their mechanisms: (1) Creating an intra-abdominal esophageal segment returns the distal esophagus to the positive-pressure abdominal environment, where elevated abdominal pressure squeezes the esophagus shut rather than promoting reflux. (2) Hiatal hernia reduction eliminates the intrathoracic reservoir that re-refluxes its contents. (3) Crural approximation re-establishes skeletal muscle buttressing of the LES. (4) Fundic wrap narrows the angle of His (restoring the flap valve), acts as a one-way mechanical valve, and prevents fundal distention that would otherwise trigger TLESRs. Boards test each of these mechanisms individually.Wrap types: Nissen is 360 degrees with the strongest antireflux effect and the most side effects (dysphagia, gas-bloat syndrome, inability to belch or vomit). Toupet is posterior 270 degrees. Dor is anterior 180 degrees. Partial wraps have less antireflux efficacy but fewer obstructive side effects and are preferred when esophageal peristalsis is impaired.IEM and wrap selection: If manometry shows ineffective esophageal motility, a Nissen wrap creates a high-pressure zone that weak peristalsis cannot overcome, resulting in post-operative dysphagia. Manometry before fundoplication is standard of care precisely to identify this. Many surgeons choose Toupet in patients with documented IEM.Long-term outcomes: Swedish Patient Registry data from 2,655 fundoplication patients showed 17.7% reflux recurrence at mean 5.1 years follow-up. Fundoplication is effective but not permanent. Risk factors for recurrence include female sex, older age, and comorbidity. Patients should understand that long-term PPI use may still be necessary.Morbid obesity and surgical choice: In patients with BMI greater than 35, fundoplication has a higher failure rate due to persistent mechanical stress from elevated intra-abdominal pressure and ongoing visceral adiposity effects. Roux-en-Y gastric bypass is the preferred operation for GERD in morbidly obese patients. It addresses both reflux (small gastric pouch, Roux limb diverting bile and pancreatic secretions) and obesity simultaneously. Sleeve gastrectomy converts the stomach to a high-pressure tube, removes the fundus, disrupts the angle of His, and causes or worsens GERD. De novo GERD after sleeve gastrectomy is a recognized complication. If the board presents a morbidly obese patient with significant GERD considering bariatric surgery, the answer is Roux-en-Y, not sleeve.LINX magnetic sphincter augmentation: A ring of titanium beads with magnetic cores placed laparoscopically around the distal esophagus. Magnetic attraction maintains closure; swallowing force temporarily separates beads. Preserves ability to belch and vomit in most patients. No randomized comparison to fundoplication exists; uncontrolled studies show comparable results. One randomized trial compared LINX to optimized medical therapy and showed MSA superiority for regurgitation control. ACG recommends MSA as an alternative to fundoplication specifically for regurgitation-predominant patients failing medical therapy. Contraindications include large hiatal hernias and certain MRI requirements (though newer designs are MRI-conditional).Endoscopic antireflux therapies: Stretta delivers radiofrequency energy to the LES area; results are mixed and guidelines offer limited endorsement. Transoral incisionless fundoplication (TIF) with the EsophyX device creates a partial fundoplication endoscopically with no abdominal incisions. Randomized trials show TIF efficacy for regurgitation. ACG recommends considering TIF for troublesome regurgitation or heartburn without severe esophagitis (LA-C or D) and without hiatal hernia larger than 2 cm. Anti-reflux mucosectomy (ARMS) uses EMR at the cardia to create submucosal fibrosis that tightens the EGJ; data predominantly from Asian centers; promising but not yet established in US practice.Board PearlsHigh-yield: Fundoplication corrects four separate pathophysiologic defects, not just LES pressure. Know what each surgical step does: intra-abdominal segment, hernia reduction, crural repair, and fundic wrap each target a distinct mechanism.Board trap: A morbidly obese patient with significant GERD is being evaluated for bariatric surgery. Sleeve gastrectomy can worsen or cause de novo GERD. Roux-en-Y gastric bypass is the correct answer.High-yield: MSA (LINX) is specifically indicated for regurgitation-predominant GERD not responding to medical therapy, not as a blanket alternative to fundoplication for all GERD.