Mucosal impedance as a diagnostic tool for gastroesophageal reflux disease: an update for clinicians.

Mucosal impedance is a marker of esophageal mucosal integrity and a novel technique for assessing esophageal function and pathology. This article highlights its development and clinical application for gastroesophageal reflux disease (GERD), Barrett's esophagus, and eosinophilic esophagitis. A narrative review of key publications describing the development and use of mucosal impedance in clinical practice was conducted. A low mean nocturnal baseline impedance (MNBI) has been shown to be an independent predictor of response to anti-reflux therapy. MNBI predicts medication-responsive heartburn better than distal esophageal acid exposure time. Patients with equivocal evidence of GERD using conventional methods, with a low MNBI, had an improvement in symptoms following the initiation of PPI therapy compared to those with a normal MNBI. A similar trend was seen in a post fundoplication cohort. Strong clinical utility for the use of mucosal impedance in assessing eosinophilic esophagitis has been repeatedly demonstrated; however, there is minimal direction for application in Barrett's esophagus. The authors conclude that mucosal impedance has potential clinical utility for the assessment and diagnosis of GERD, particularly when conventional investigations have yielded equivocal results.

Once in a Bile - the Incidence of Bile Reflux Post-Bariatric Surgery.

PURPOSE: Excellent metabolic improvement following one anastomosis gastric bypass (OAGB) remains compromised by the risk of esophageal bile reflux and theoretical carcinogenic potential. No 'gold standard' investigation exists for esophageal bile reflux, with diverse methods employed in the few studies evaluating it post-obesity surgery. As such, data on the incidence and severity of esophageal bile reflux is limited, with comparative studies lacking. This study aims to use specifically tailored biliary scintigraphy and upper gastrointestinal endoscopy protocols to evaluate esophageal bile reflux after OAGB, sleeve gastrectomy (SG) and Roux-en-Y gastric bypass (RYGB). METHODS: Fifty-eight participants underwent OAGB (20), SG (15) or RYGB (23) between November 2018 and July 2020. Pre-operative reflux symptom assessment and gastroscopy were performed and repeated post-operatively at 6 months along with biliary scintigraphy. RESULTS: Gastric reflux of bile was identified by biliary scintigraphy in 14 OAGB (70%), one RYGB (5%) and four SG participants (31%), with a mean of 2.9% (SD 1.5) reflux (% of total radioactivity). One participant (OAGB) demonstrated esophageal bile reflux. De novo macro- or microscopic gastroesophagitis occurred in 11 OAGB (58%), 8 SG (57%) and 7 RYGB (30%) participants. Thirteen participants had worsened reflux symptoms post-operatively (OAGB, 4; SG, 7; RYGB, 2). Scintigraphic esophageal bile reflux bore no statistical association with de novo gastroesophagitis or reflux symptoms. CONCLUSION: Despite high incidence of gastric bile reflux post-OAGB, esophageal bile reflux is rare. With scarce literature of tumour development post-OAGB, frequent low-volume gastric bile reflux likely bears little clinical consequence; however, longer-term studies are needed. CLINICAL TRIAL REGISTRY: Australian New Zealand Clinical Trials Registry number ACTRN12618000806268.

Quantification of fluoroscopic fundoplication anatomy: inter- and intraobserver reliability.

The etiology of postfundoplication dysphagia remains incompletely understood. Subtle changes of gastroesophageal junction (GEJ) anatomy may be contributory. Barium swallows have potential for standardization to evaluate postsurgical anatomical features. Using structured barium swallows, we aim to identify reproducible, objectively measured postfundoplication anatomical features that will permit future comparison between patients with/without dysphagia. At 6-12 months of postfundoplication, 31 patients underwent structured barium swallow with video-fluoroscopy recording: standing anteroposterior; standing oblique (×2); prone oblique (×2); and prone oblique with continuous free drinking. A primary observer recorded 11 variables of GEJ anatomy for each view, repeated 3 months later, forming two datasets to assess intraobserver consistency. Interobserver reliability was determined using a dataset each from the primary observer and two medical students (after training). Intraclass correlation coefficients (ICC) were based on two-way mixed-effects model (ICC agreement: 0.40-0.59 'fair'; 0.60-0.74 'good'; 0.75-1.00 'excellent'). Interobserver reliability was good-excellent for 47 of 66 measurements. Measures of maximal esophageal diameter cf. wrap opening diameter and posterior esophageal angle showed high interobserver reproducibility on all views (ICC range 0.84-0.91; 0.68-0.80, respectively). Interobserver agreement was good-excellent for 5/6 views when measuring anterior GEJ displacement and axis deviation (ICC range 0.56-0.79; 0.41-0.77, respectively). Measures of wrap length showed lower reproducibility. Prone oblique measurements showed highest reproducibility (good-excellent agreement in 19/22 measurements). Intraobserver consistency was excellent for 98% of measurements (ICC range 0.74-0.99). Objective measurements of postfundoplication GEJ anatomy using structured barium swallow are reproducible and may allow further interrogation of anatomical features contributing to postfundoplication dysphagia.

Laparoscopic Fundoplication Is Effective Treatment for Patients with Gastroesophageal Reflux and Absent Esophageal Contractility.

BACKGROUND: Anti-reflux surgery in the setting of preoperative esophageal dysmotility is contentious due to fear of persistent long-term dysphagia, particularly in individuals with an aperistaltic esophagus (absent esophageal contractility). This study determined the long-term postoperative outcomes following fundoplication in patients with absent esophageal contractility versus normal motility. METHODS: A prospective database was used to identify all (40) patients with absent esophageal contractility who subsequently underwent fundoplication (36 anterior partial, 4 Nissen). Cases were propensity matched based on age, gender, and fundoplication type with another 708 patients who all had normal motility. Groups were assessed using prospective symptom assessment questionnaires to assess heartburn, dysphagia for solids and liquids, regurgitation, and satisfaction with surgery, and outcomes were compared. RESULTS: Across follow-up to 10 years, no significant differences were found between the two groups for any of the assessed postoperative symptoms. Multivariate analysis found that patients with absent contractility had worse preoperative dysphagia (adjusted mean difference 1.09, p = 0.048), but postoperatively there were no significant differences in dysphagia scores at 5- and 10-year follow-up. No differences in overall patient satisfaction were identified across the follow-up period. CONCLUSION: Laparoscopic partial fundoplication in patients with absent esophageal contractility achieves acceptable symptom control without significantly worse dysphagia compared with patients with normal contractility. Patients with absent contractility should still be considered for surgery.

HIDA and Seek: Challenges of Scintigraphy to Diagnose Bile Reflux Post-Bariatric Surgery.

INTRODUCTION: Oesophageal bile reflux after bariatric surgery may trigger development of Barrett's oesophagus. Gastro-oesophageal reflux of bile is captured by hepatobiliary iminodiacetic acid (HIDA) scintigraphy; however, anatomical and physiological changes after bariatric surgery warrant protocol modifications to optimise bile reflux detection. METHODS: HIDA scintigraphy occurred 6 months after either sleeve gastrectomy, Roux-en-Y gastric bypass or one-anastomosis gastric bypass. Standard HIDA scanning involves (i) 6-h fast and 24-h abstinence from opioids; (ii) IV administration of 99mTc di-isopropyl iminodiacetic acid; and (iii) dual anterior/posterior 60-min dynamic scanning of the duodenum, stomach and oesophagus. Three challenges were identified, and modifications were implemented, namely, (1) anatomical localisation of refluxed bile on planar scintigraphy was improved by adding a SPECT/CT for 3D imaging; (2) impaired cholecystokinin-controlled gallbladder emptying, following bypassed duodenum, was addressed by ingestion of a 'fatty meal'; and (3) intestinal hypomotility after gastric bypass was counteracted by longer scan duration (75-90 min) to allow bile to pass beyond the gastro-jejunal anastomosis. RESULTS: HIDA scan was undertaken in 18 patients, 13 of whom underwent the modified protocol. The tailored protocol ameliorated issues identified with the standard HIDA scan protocol; thus, accurate anatomical localisation was achieved in all patients, no delayed gallbladder emptying was observed, and bile was observed beyond the gastro-jejunal anastomosis in all gastric bypass patients. The modified technique was well tolerated by patients. CONCLUSION: A tailored HIDA scan protocol with addition of a SPECT-CT scan, ingestion of a fatty meal and prolonged scanning duration results in enhanced bile reflux detection in post-bariatric surgical patients.

Detecting Bile Reflux-the Enigma of Bariatric Surgery.

Duodeno-gastro-esophageal reflux, or bile reflux, is a condition for which there is no diagnostic gold standard, and it remains controversial in terms of carcinoma risk. This is pertinent in the context of an increasingly overweight population who are undergoing weight-loss operations that theoretically further increase the risk of bile reflux. This article reviews investigations for bile reflux based on efficacy, patient tolerability, cost, and infrastructure requirements. At this time, whilst no gold standard exists, hepatobiliary scintigraphy is the least invasive investigation with good-patient tolerability, sensitivity, and reproducibility to be considered first-line for diagnosis of bile reflux. This review will guide clinicians investigating bile reflux.

Incidence of Achalasia in South Australia Based on Esophageal Manometry Findings.

BACKGROUND & AIMS: Achalasia is a disorder of esophageal motility with a reported incidence of 0.5 to 1.6 per 100,000 persons per year in Europe, Asia, Canada, and America. However, estimates of incidence values have been derived predominantly from retrospective searches of databases of hospital discharge codes and personal communications with gastroenterologists, and are likely to be incorrect. We performed a cohort study based on esophageal manometry findings to determine the incidence of achalasia in South Australia. METHODS: We collected data from the Australian Bureau of Statistics on the South Australian population. Cases of achalasia diagnosed by esophageal manometry were identified from the 3 adult manometry laboratory databases in South Australia. Endoscopy reports and case notes were reviewed for correlations with diagnoses. The annual incidence of achalasia in the South Australian population was calculated for the decade 2004 to 2013. Findings were standardized to those of the European Standard Population based on age. RESULTS: The annual incidence of achalasia in South Australia ranged from 2.3 to 2.8 per 100,000 persons. The mean age at diagnosis was 62.1 ± 18.1 years. The incidence of achalasia increased with age (Spearman rho, 0.95; P < .01). The age-standardized incidence ranged from 2.1 (95% CI, 1.8-2.3) to 2.5 (95% CI, 2.2-2.7). CONCLUSIONS: Based on a cohort study of esophageal manometry, we determined the incidence of achalasia in South Australia to be 2.3 to 2.8 per 100,000 persons and to increase with age. South Australia's relative geographic isolation and the population's access to manometry allowed for more accurate identification of cases than hospital code analyses, with a low probability of missed cases.

Surveillance endoscopy at five or more years after cardiomyotomy for achalasia.

OBJECTIVE: To perform long-term histopathological and clinical assessment of patients who have previously undergone cardiomyotomy for achalasia. BACKGROUND: There are few studies on long-term outcome for patients treated by cardiomyotomy for achalasia. Recent publications suggest that these patients may be at high risk of both squamous cell carcinoma and adenocarcinoma of the esophagus. METHODS: All patients, in whom at least 5 years had elapsed since laparoscopic cardiomyotomy for achalasia, were identified from a prospective database. Patients were invited to attend for endoscopy and clinical outcome was assessed by questionnaire. RESULTS: Out of 171 patients identified, 2 had died from esophageal carcinoma. Of the remainder, 68 were recruited [mean age 52 years (range 26-72)]. Fifty-six percent reported minimal symptoms and 6% experienced frequent reflux symptoms. Almost all patients (93%) reported some dysphagia, but dysphagia scores remained significantly lower than preoperatively (P < 0.0001). Quality of life was comparable to normal subjects, and 97% of patients indicated they had made the correct decision to undergo surgery. At endoscopy 83% had evidence of chronic inflammation in the distal esophagus on histopathology, including 22% with moderate to severe esophagitis and 7% with Barrett's esophagus. Five patients showed esophageal candidiasis, and 2 had eosinophilic esophagitis. No dysplasia or malignancy was identified. CONCLUSIONS: The clinical outcome remains excellent in most patients at long-term follow-up after cardiomyotomy for achalasia. Surveillance endoscopy might identify high-risk patients but routine endoscopy in all patients is probably not necessary, particularly early after surgery.

Laparoscopic stapled cardioplasty for end-stage achalasia.

INTRODUCTION: The standard of care for achalasia is laparoscopic Heller's cardiomyotomy. This procedure achieves satisfactory and long-standing results in over 85 % of patients. However, in 10-15 % of patients, esophageal function will progressively deteriorate, and up to 5 % will develop end-stage achalasia. Options in these difficult patients are limited, and include redo cardiomyotomy, repeat dilatation, and in severe cases, esophagectomy. METHODS: In this report, we describe an alternate approach, a cardioplasty, which was originally described by Heyrovsky in 1913. RESULTS: The development of an angulated stapling device now makes this operation feasible by a laparoscopic approach. CONCLUSION: This report highlights our technique for laparoscopic cardioplasty in patients with end-stage achalasia.

Dysphagia and gastroesophageal junction resistance to flow following partial and total fundoplication.

BACKGROUND: Esophageal peristalsis and basal gastroesophageal junction (GEJ) pressure correlate poorly with dysphagia. AIM: To determine intraluminal pressures that reflect GEJ function and to determine manometric correlates for dysphagia before and after fundoplication. METHODS: The relationships between maximal intrabolus pressure, residual GEJ relaxation pressure and peak peristaltic pressure for water swallows were determined in normal volunteers and patients with reflux disease before and after fundoplication. GEJ anatomy was assessed by radiological, endoscopic and surgical criteria, whilst dysphagia was measured with a validated composite dysphagia score. RESULTS: Dysphagia was significantly associated with lower peak peristaltic pressure in the distal esophagus and the presence of a hiatus hernia preoperatively, as well as higher residual pressure on GEJ relaxation postoperatively. Peak distal peristaltic pressure and residual GEJ relaxation pressure were predictors of intrabolus pressure after total fundoplication (p<0.002). Residual GEJ relaxation pressure was four times higher after 360° fundoplication (N=19) compared to 90° fundoplication (N=14, p<0.0001). Similarly, intrabolus pressure was elevated 2.5 times after 360° fundoplication and nearly doubled after 90° fundoplication and both were significantly different from controls (N=22) and reflux disease patients (N=53, p<0.0001). CONCLUSIONS: Gastroesophageal junction impedance to flow imposed by fundoplication is associated with dysphagia when there is suboptimal distal esophageal contraction strength and relatively high residual GEJ relaxation pressure.

Gastroesophageal reflux disease and chronic sinusitis: in search of an esophageal-nasal reflex.

BACKGROUND: This study was performed to explore whether or not a neural reflex linking the esophagus and the nasal airway exists, as a pathogenic mechanism accounting for the association between gastroesophageal reflux (GER) disease and chronic rhinosinusitis (CRS). A prospective trial of healthy human volunteers was performed. METHODS: Ten healthy volunteers without GER or sinonasal disease were investigated using an acid infusion challenge test. Normal saline and hydrochloric acid were infused into the lower esophagus through an esophageal manometry catheter. Nasal responses in symptom score, nasal inspiratory peak flow, and mucus production were analyzed after the esophageal challenge. RESULTS: A tendency for an increase in nasal mucus production was observed after esophageal stimulation with both normal saline and HCl. This returned to baseline level 45 minutes after the acid infusion. A similar trend was also observed with the measurements of nasal symptom scores and, to a lesser extent, nasal inspiratory peak flow. CONCLUSION: These results support the possibility that a neural reflex exists between the esophagus and the paranasal sinuses via the vagus nerve. If indeed present, the reflex-mediated rhinitis derived from this neuropathic inflammation may contribute to the development of CRS in patients with GER. Further study is required to define the relationship between GER and CRS.

Recurrent symptoms after fundoplication with a negative pH study--recurrent reflux or functional heartburn?

INTRODUCTION: A small cohort of patients present after antireflux surgery complaining of recurrent heartburn. Over two thirds of these patients will have a negative 24-h pH study. The aim of our study is to determine whether these patients have an associated functional disorder or abnormal cytokine activity and to examine the reproducibility of pH testing. METHODS: A prospective analysis was carried out on a cohort of patients who had undergone a fundoplication and postoperative pH testing for recurrent heartburn: group A--patients with recurrent heartburn and a negative 24-h pH study and group B (control group)--patients with recurrent heartburn and a positive pH study. Questionnaires, a blood sample, and repeat pH testing were completed. RESULTS: Sixty-nine patients were identified. Group A's depression score (8.6 +/- 4.1) was significantly higher than group B's (5.9 +/- 4.2; P = 0.03). Cytokine levels were similar in both groups. Forty-seven of 49 (96%) patients who underwent repeat pH testing had a negative study. Symptom-reflux correlation was highly significant (P < 0.001). CONCLUSION: Some patients with recurrent heartburn and a negative pH study have associated functional or psychiatric comorbidities such as depression. Reproducibility of 24-h pH testing in these patients is excellent.

Laparoscopic fundoplication in patients with a hypertensive lower esophageal sphincter.

BACKGROUND: A small proportion of patients evaluated with manometry prior to a fundoplication have a high-pressure lower esophageal sphincter (LES). This paper examines the outcome of laparoscopic fundoplication for these patients. MATERIAL AND METHODS: Between October 1991 and December 2006, 1,886 patients underwent primary laparoscopic fundoplication. Those with a high-pressure LES on preoperative manometry (LESP > or = 30 mm Hg at end expiration) were identified from a prospective database. Long-term outcomes were determined using analogue symptom scores (0-10) for heartburn, dysphagia, and patient satisfaction and compared to those of a matched control group. RESULTS: Thirty patients (1.6%), nine men and 21 women, median age 51 years, had a hypertensive LES (mean, 36 mmHg; range, 30-55). Median follow-up after fundoplication was 99 (12-182) months. These patients had similar mean symptom scores to 30 matched controls for heartburn (2.3 vs. 2.2, P = 0.541), dysphagia (2.7 vs. 3.1, P = 0.539), and satisfaction (7.4 vs. 7.6, P = 0.546). Five patients required revision for dysphagia compared to no control patients (P = 0.005). These patients had a higher preoperative dysphagia score (6.6 vs. 3.1, P = 0.036). CONCLUSION: Laparoscopic fundoplication can be performed with good long-term results for patients with reflux and a hypertensive LES. However, those with preoperative dysphagia have a higher failure rate.

Esophageal pH profile following laparoscopic total fundoplication compared to anterior fundoplication.

In Barrett's esophagus, total abolition of reflux may give maximum protection against the development of malignancy. To determine whether laparoscopic anterior fundoplication gives the same degree of antireflux control as a total fundoplication, we analyzed a prospectively followed cohort of patients from randomized controlled trials of laparoscopic antireflux surgery. There were 167 patients who returned for routine esophageal pH studies within 6 months of surgery (123 laparoscopic total fundoplications and 44 anterior fundoplications). There was no difference in percentage time pH <4 between fundoplication groups, but the total number of reflux episodes was significantly different (total fundoplication, four reflux events vs. partial fundoplication, six reflux events; p = 0.03). It is difficult to believe that this difference is either biologically or clinically important. In patients with a second esophageal pH study more than 5 years later, both the percentage time pH <4 (0.1% total fundoplication vs. 2.7% partial fundoplication; p = 0.004) and total number of reflux episodes (three total fundoplication vs. 24 partial fundoplication; p = 0.002) were significantly different. However, the postoperative esophageal acid exposure was within the normal range for both total and partial fundoplication, so whether the statistical difference is clinically important, remains a moot point.

Use of antireflux medication after antireflux surgery.

INTRODUCTION: It is claimed that a substantial number of patients who undergo antireflux surgery use antireflux medication postoperatively. This study was aimed to determine the prevalence and underlying reasons for antireflux medication usage in patients after surgery. MATERIALS AND METHODS: A questionnaire on the usage of antireflux medication was sent to 1,008 patients identified from a prospective database of patients who had undergone a laparoscopic antireflux procedure. RESULTS: A total of 844 patients (84%) returned the questionnaire. Mean follow-up was 5.9 years after surgery. A single or combination of medications was being taken by 312 patients (37%): 82% proton pump inhibitors, 9% H2-blockers and 34% antacids. Fifty-two patients (17%) had never stopped taking medication, whereas 260 patients (83%) restarted medication at a mean of 2.5 years after surgery. Return of the same (31%) or different (49%) symptoms were the commonest reasons for taking medication, whereas 20% were asymptomatic or had other reasons for medication use. Postoperative 24-hour pH studies were abnormal in 16/61 patients (26%) on medication and in 5/78 patients (6%) not taking medication. CONCLUSIONS: Antireflux medication is frequently taken by many patients for various symptoms after antireflux surgery. Symptomatic patients should be properly investigated before antireflux medications are prescribed.

Reoperation for dysphagia after cardiomyotomy for achalasia.

BACKGROUND: Although laparoscopic cardiomyotomy is considered to be the treatment of choice for achalasia, there is no consensus about how persistent or recurrent dysphagia after myotomy should be treated. In the current study we evaluated our experience with reoperation following previous cardiomyotomy. METHODS: Between 1992 and 2006, 19 patients underwent re-myotomy: 7 for persistent dysphagia, 12 for recurrent dysphagia. Different operative approaches were used, depending on surgeon's preference and the technique used for the first operation. RESULTS: The mean interval between the cardiomyotomies was 81 months. In 12 patients, the alternative body cavity to that used for the first operation was used for access in the revision operation. This was associated with a shorter operation time. Mean follow-up after the revision operation was 3.6 years. Mean satisfaction score was 7 (out of 10), and 89% of patients had an improvement in symptoms. CONCLUSION: Reoperation for persistent or recurrent achalasia achieves a satisfactory outcome in most patients. Using the alternative body cavity to that used in the original procedure facilitates minimal access techniques, and gives easier access to the operative field.

Esophageal manometry and clinical outcome after laparoscopic Nissen fundoplication.

INTRODUCTION: The outcome after laparoscopic Nissen fundoplication can be assessed by either clinical symptoms or objective tests. Outcomes from objective tests are often held in higher regard than clinical data when determining the merits, or otherwise, of various antireflux surgery procedures. In this study, we sought to determine whether there is a relationship between postoperative symptoms and parameters measured by esophageal manometry to determine whether early postoperative esophageal manometry is a useful investigation for the routine assessment of post fundoplication outcome. METHODS: One hundred and forty-three patients who had undergone a laparoscopic Nissen fundoplication, clinical follow-up at 3 months and 5 years after surgery, and esophageal manometry at 3 months after fundoplication as part of routine follow-up in 1 of 5 clinical trials were studied. Nineteen of these patients also underwent manometry 5 years after fundoplication. Postoperative symptoms were prospectively determined by applying a standardized questionnaire, which assessed dysphagia, heartburn, bloat symptoms, and overall satisfaction using analog scales. Patients were classified into different groups according to the analog scores for clinical symptoms. Correlations between clinical and postoperative manometry outcomes were sought. RESULTS: No significant associations were found between parameters measured by esophageal manometry (lower esophageal sphincter resting and residual relaxation pressures, peristaltic amplitude and normal peristaltic propagation) and clinical parameters (dysphagia, heartburn, bloating, and overall satisfaction) for all time points -- 3 months postoperative manometry vs symptoms at 3 months and 5 years, 5 years postoperative manometry vs symptoms at 5 years, except for a weak (r = -0.17, p = 0.042) correlation between the percentage of successfully propagated swallows at 3 months and dysphagia for solids at 5 years. CONCLUSION: Postoperative esophageal manometry parameters at 3 months and 5 years after surgery were not associated with any clinically important differences in the postoperative symptoms of heartburn, dysphagia, bloat or with overall satisfaction with the surgical outcome. The routine use of esophageal manometry to assess the outcome after Nissen fundoplication does not predict clinical outcome.

Recurrent heartburn after laparoscopic fundoplication is not always recurrent reflux.

INTRODUCTION: A small cohort of patients present after antireflux surgery complaining of recurrent heartburn. Many of these patients have been empirically recommenced on proton pump inhibitors. OBJECTIVE: The aim of this study was to determine whether patients with symptoms that suggest recurrent reflux had objective evidence of reflux, and to determine predictors of recurrent reflux. METHODS: We identified all patients from an existing database who had undergone pH monitoring for "recurrent heartburn" after fundoplication. These patients were then cross-referenced to another database, which recorded the outcomes for patients who had undergone a laparoscopic fundoplication. Patients complaining of dysphagia or other problems without heartburn were excluded from analysis. RESULTS: Seventy-six patients were identified who met the inclusion criteria. Fifty-six (74%) of these had a normal 24-h pH study. Thirty-five patients (63%) with a normal pH study were on medication for heartburn at the time of referral. Three factors were found to be associated with an abnormal 24-h pH study: a partial fundoplication (P = 0.039), onset of symptoms 6 months or more after surgery (P < 0.001), and a good symptom response when antireflux medication was recommenced (P = 0.015). CONCLUSIONS: Not all patients complaining of recurrent heartburn after fundoplication have evidence of abnormal reflux. Objective evidence of abnormal esophageal acid exposure should be confirmed before recommencing antireflux medication.