Management of Gastroesophageal Reflux Disease

10
Management of Gastroesophageal Reflux Disease RADU TUTUIAN, MD; DONALD O. CASTELL, MD ABSTRACT: Gastroesophageal reflux disease (GERD) is a chronic condition requiring long-term treatment. Sim- ple lifestyle modifications are the first methods em- ployed by patients and, because of their low cost and simplicity, should be continued even when more potent therapies are initiated. Potent acid-suppressive therapy is currently the most important and successful medical therapy. Whereas healing of the esophageal mucosa is achieved with a single dose of any proton pump inhib- itor (PPI) in more than 80% of cases, symptoms are more difficult to control. Patients with persistent symptoms on therapy should be tested (preferably with combined multichannel intraluminal impedance and pH) for asso- ciation of symptoms with acid, nonacid, or no GER. Long-term follow-up studies indicate that PPIs are effi- cacious, tolerable, and safe medication. So far, promo- tility agents have shown limited efficacy, and their side- effect profile outweighs their benefits. Antireflux surgery in carefully selected patients (ie, young, typical GERD symptoms, abnormal pH study, and good response to PPI) is as effective as PPI therapy and should be offered to these patients as an alternative to medication. Still, patients should be informed about the risks of antireflux surgery (ie, risk of postoperative dysphagia; decreased ability to belch, possibly leading to bloating; increased flatulence). Endoscopic antireflux procedures are rec- ommended only in selected patients and given the rel- ative short experience with these techniques, patients treated with endoscopic procedures should be enrolled in a rigorous follow-up program. KEY INDEXING TERMS: Gastroesophageal reflux disease (GERD); Proton pump inhibitors; Antireflux surgery. [Am J Med Sci 2003;326(5):309–318.] A pproximately 40% of the US population has symptoms of gastroesophageal reflux disease (GERD), 1 making it the fourth most prevalent gas- trointestinal disease in the United States. 2 GERD is a chronic disease requiring long-term therapy. As a general rule, the management of GERD should fol- low a step-wise approach, starting with simple ther- apeutic modalities and gradually advancing to more potent and more aggressive modalities based on 2 goals: healing of lesions and alleviation of symptoms. The pattern of presentation and therapy is well- expressed by the “heartburn iceberg” shown in Fig- ure 1. The vast majority of patients have only occa- sional symptoms and will empirically treat heartburn with over-the-counter (OTC) medications and not seek medical attention. 3 Patients with fre- quent symptoms will seek medical attention and are often evaluated by primary care physicians and given prescriptions for acid-suppressive therapy. Because acid-suppressive therapy is very effective and has few side effects, specialists (gastroenterolo- gists and gastrointestinal surgeons) are likely to see only the “tip of the iceberg” represented by patients with severe or persistent symptoms not responsive to standard treatment. 4 When evaluated by gastro- enterologists, treatment targets reduction of esoph- ageal acid exposure. Supported by a good correlation between control of intragastric pH and healing of erosive esophagitis, 5 medical strategies employ pharmacological suppression of gastric acid produc- tion, whereas surgical and endoscopic strategies em- ploy augmentation of the gastroesophageal junction. The above concepts have primarily been studied in patients with so-called “typical” symptoms of GERD (heartburn, regurgitation) but apply equally to those with atypical (chest pain, asthma/cough, hoarse- ness, sore throat) symptoms or complications (ulcer- ation, strictures, metaplasia) of the disease. Simple Therapeutic Modalities (Lifestyle Modifications) In the current days of very potent acid-suppres- sive therapy, simple, alternative, patient-driven, and less expensive GERD treatments tend to be forgotten. Most of these methods were the main therapeutic modalities before the late 1970s and include elevation of head of the bed, wearing loose- From the Division of Gastroenterology/Hepatology, Medical University of South Carolina, Charleston, South Carolina. Correspondence: Radu Tutuian, M.D., Division of Gastroenter- ology/Hepatology, Medical University of South Carolina, 96 Jonathan Lucas Street, 210 CSB, Charleston, SC 29425 (E-mail: [email protected]). 309 THE AMERICAN JOURNAL OF THE MEDICAL SCIENCES

Transcript of Management of Gastroesophageal Reflux Disease

Page 1: Management of Gastroesophageal Reflux Disease

Management of Gastroesophageal RefluxDisease

RADU TUTUIAN, MD; DONALD O. CASTELL, MD

ABSTRACT: Gastroesophageal reflux disease (GERD) isa chronic condition requiring long-term treatment. Sim-ple lifestyle modifications are the first methods em-ployed by patients and, because of their low cost andsimplicity, should be continued even when more potenttherapies are initiated. Potent acid-suppressive therapyis currently the most important and successful medicaltherapy. Whereas healing of the esophageal mucosa isachieved with a single dose of any proton pump inhib-itor (PPI) in more than 80% of cases, symptoms are moredifficult to control. Patients with persistent symptoms ontherapy should be tested (preferably with combinedmultichannel intraluminal impedance and pH) for asso-ciation of symptoms with acid, nonacid, or no GER.Long-term follow-up studies indicate that PPIs are effi-cacious, tolerable, and safe medication. So far, promo-tility agents have shown limited efficacy, and their side-

effect profile outweighs their benefits. Antireflux surgeryin carefully selected patients (ie, young, typical GERDsymptoms, abnormal pH study, and good response toPPI) is as effective as PPI therapy and should be offeredto these patients as an alternative to medication. Still,patients should be informed about the risks of antirefluxsurgery (ie, risk of postoperative dysphagia; decreasedability to belch, possibly leading to bloating; increasedflatulence). Endoscopic antireflux procedures are rec-ommended only in selected patients and given the rel-ative short experience with these techniques, patientstreated with endoscopic procedures should be enrolledin a rigorous follow-up program. KEY INDEXINGTERMS: Gastroesophageal reflux disease (GERD); Protonpump inhibitors; Antireflux surgery. [Am J Med Sci2003;326(5):309–318.]

Approximately 40% of the US population hassymptoms of gastroesophageal reflux disease

(GERD),1 making it the fourth most prevalent gas-trointestinal disease in the United States.2 GERD isa chronic disease requiring long-term therapy. As ageneral rule, the management of GERD should fol-low a step-wise approach, starting with simple ther-apeutic modalities and gradually advancing to morepotent and more aggressive modalities based on 2goals: healing of lesions and alleviation ofsymptoms.

The pattern of presentation and therapy is well-expressed by the “heartburn iceberg” shown in Fig-ure 1. The vast majority of patients have only occa-sional symptoms and will empirically treatheartburn with over-the-counter (OTC) medicationsand not seek medical attention.3 Patients with fre-quent symptoms will seek medical attention and areoften evaluated by primary care physicians andgiven prescriptions for acid-suppressive therapy.Because acid-suppressive therapy is very effective

and has few side effects, specialists (gastroenterolo-gists and gastrointestinal surgeons) are likely to seeonly the “tip of the iceberg” represented by patientswith severe or persistent symptoms not responsiveto standard treatment.4 When evaluated by gastro-enterologists, treatment targets reduction of esoph-ageal acid exposure. Supported by a good correlationbetween control of intragastric pH and healing oferosive esophagitis,5 medical strategies employpharmacological suppression of gastric acid produc-tion, whereas surgical and endoscopic strategies em-ploy augmentation of the gastroesophageal junction.

The above concepts have primarily been studied inpatients with so-called “typical” symptoms of GERD(heartburn, regurgitation) but apply equally to thosewith atypical (chest pain, asthma/cough, hoarse-ness, sore throat) symptoms or complications (ulcer-ation, strictures, metaplasia) of the disease.

Simple Therapeutic Modalities (LifestyleModifications)

In the current days of very potent acid-suppres-sive therapy, simple, alternative, patient-driven,and less expensive GERD treatments tend to beforgotten. Most of these methods were the maintherapeutic modalities before the late 1970s andinclude elevation of head of the bed, wearing loose-

From the Division of Gastroenterology/Hepatology, MedicalUniversity of South Carolina, Charleston, South Carolina.

Correspondence: Radu Tutuian, M.D., Division of Gastroenter-ology/Hepatology, Medical University of South Carolina, 96Jonathan Lucas Street, 210 CSB, Charleston, SC 29425 (E-mail:[email protected]).

309THE AMERICAN JOURNAL OF THE MEDICAL SCIENCES

Page 2: Management of Gastroesophageal Reflux Disease

fitting clothing, avoidance of meals before bedtime,weight loss, and restriction of smoking, alcohol, cof-fee, and fat.6 Today, these lifestyle modificationsoften also include use of antacids, alginate, andover-the-counter (OTC) doses of histamine-2 recep-tor antagonists (H2RA).

Elevation of the head of the bed helps improve-ment of esophageal acid clearance and decreases thetotal recumbent acid exposure.7 These hypothesesare supported by studies indicating significant re-duction in nocturnal acid clearance time and totalnocturnal acid exposure using 6-inch blocks to ele-vate the head of the bed.8 A more patient-friendlyalternative is to sleep predominantly on the leftside.9 Avoidance of meals for 3 hours before bedtimeis based on studies indicating that postprandial re-cumbency leads to a significant increase in the num-ber and duration of reflux events10

Wearing loose-fitting clothing as a measure toreduce gastroesophageal reflux is based on the hy-pothesis that tight clothing increases intragastricpressure and therefore the gastroesophageal pres-sure gradient across the lower esophageal sphincter(LES),11 the so-called “tight pants syndrome.” Eventhough there are no good studies supporting thishypothesis, this relatively simple and intuitive mea-sure should not be ignored.

Based on studies showing a correlation of morbidobesity with reflux and lower LES pressures,12

weight reduction in the attempt to improve GERD isa rational approach. Even though not formally stud-ied, it is commonly believed that typical GERDsymptoms improve in patients during weightreduction.

Recommendations to avoid certain foods and limit

smoking and alcohol are based on studies indicatingdecreases in LES pressures and/or increased num-ber of gastroesophageal reflux episodes. Ingestion ofhigh-fat meals decreases LES pressure,13 increasesfrequency of transient lower esophageal relax-ations,14 and increases esophageal acid exposure forup to 3 hours after meals.15 Increased esophagealacid exposure has been documented after ingestionof chocolate16 and alcohol17 and after smoking.18,19

The use of antacids in treatment of GERD relieson the neutralizing capabilities of these compoundson acid gastric secretions. The superiority of antac-ids over placebo was proven in double-blind studiesin patients with reflux esophagitis.20,21 Other place-bo-controlled studies have shown the superiority ofan alginic acid-antacid combination in controllingreflux symptoms.22 The observation of the floatingnature of alginic acid within the stomach suggestedthat it might work well in patients with symptomsduring the upright position,23 a hypothesis sup-ported in subsequent studies.24

After several years of proven efficacy and safety ofstandard-dose H2RAs, the class of medication be-came available as low-dose over-the-counter (OTC)preparations for “conservative” treatment of GERD.There is only limited information available showingsymptomatic improvement with OTC doses ofH2Ras,25 although several studies have documentedthe ability of these preparations to decrease intra-gastric acidity.26,27 In 2002, the American Gastroen-terology Association (AGA) issued a consensus state-ment declaring OTC H2RA and antacid the first lineof treatment for patients with mild GERD symp-toms. The combination H2RA/antacid was consid-ered better at symptom relief than its constituentcomponents alone.

Table 1 summarizes the life-style modification ap-proach to GERD. Even though recently developedacid-suppressive agents are highly effective in treat-ment of GERD, these simple measures should bediscussed with patients. Their simplicity and lowcost justify them as phase 1 therapy to be continuedin all patients suffering from this disorder. OTCantacids or even H2RAs should be recommended foroccasional “breakthrough” symptoms while patientsare receiving more potent therapies.

Figure 1. Pattern of presentation and therapy of GERD patientsexpressed by the “heartburn iceberg.” Endo, endoscopic antirefluxprocedure.

Table 1. Lifestyle Modifications That Can Help Improve GERDSymptoms

Sleep with the head of the bed elevatedSleep on the left sideAvoid late meals/avoid recumbent position 3 hours after mealsAvoid high-fat mealsUse smaller mealsUse saliva-stimulating agents (ie, hard candies, chewing gum)Wear loose-fitting clothingRestrict smoking, alcohol, coffee, chocolateLose weight

Management of Gastroesophageal Reflux Disease

310 November 2003 Volume 326 Number 5

Page 3: Management of Gastroesophageal Reflux Disease

Pharmacologic Management of GERD

The objectives of pharmacological treatment ofGERD are relief of symptoms, avoidance of compli-cations, and healing of esophageal mucosa. Theprincipal classes of pharmacological agents are: acidsuppressive drugs [H2RAs, proton pump inhibitors(PPIs)], promotility agents (bethanechol, metoclo-pramide, cisapride, domperidone, erythromycin, te-gaserod), mucosal protective agents (sucralfate), andagents to reduce transient lower esophageal sphinc-ter relaxation (TLESR) (baclofen).

Acid-Suppressive DrugsHistamine-2 Receptor Antagonists. H2RAs

were the antisecretory therapy of choice from themid-1970s until the introduction of PPIs into clinicalpractice in the late 1980s.28 Currently in the UnitedStates, 4 H2RAs are available for clinical use: rani-tidine (Zantac), famotidine (Pepcid), cimetidine(Tagamet), and nizatidine (Axid). Even though themore recently developed PPIs have been shown tobe superior, the H2RAs still remain useful intreatment of milder forms of the disease and foron-demand therapy, particularly for nocturnalGERD symptoms.

Prescription dosages of H2RAs can be groupedinto standard dose (150 mg of ranitidine, 20 mg offamotidine, 400 mg of cimetidine, and 150 mg ofnizatidine, each twice daily) and high dose (obtainedby doubling the standard doses). The healing rateswith H2RAs range between 50 and 70% at 8 weeksand 60 to 80% at 12 weeks.29 Most studies haveshown superiority of H2RAs to placebo but no sig-nificant differences among high and standard doses(possible type II error, because most studies werepowered to show differences from placebo). It wassoon recognized that esophageal healing rates cor-related with decrease of esophageal acid exposure,duration of acid suppressive therapy, and degree ofesophagitis.30 Studies have shown that esophagealhealing rates at 12 weeks were higher than healingrates at 8 weeks,31 but 24 weeks of H2RA could not

heal erosive esophagitis not healed at 12 weeks.32

H2RAs relieve GERD symptoms in about half ofpatients after 6 to 12 weeks.33

Even in this era of potent acid-suppressive PPIs,H2RAs provide the advantage of prompt relief ofheartburn,34 and when administered at bedtime,they improve nocturnal gastric acid control in GERDpatients taking PPIs.35

Proton Pump Inhibitors. PPIs are superior toH2RAs in treating erosive esophagitis36 and its com-plications,37 relieving symptoms from erosive andnonerosive GERD,38,39 and preventing recurrence ofGERD-associated symptoms.40 Studies by Zeitoun,41

Lundell et al,42 Vantrappen et al,43 and Klinken-berg-Knol et al36 indicate superiority of the PPIversus H2RA. Thus, they have surpassed H2RAs asthe antisecretory agents of choice (Figure 2). PPIsare substituted benzimidazoles that irreversiblybind the H�,K�-ATPase, the final common step inacid secretion.44

Currently, 5 PPIs are commercially available inthe United States: omeprazole, lansoprazole, rabe-prazole, pantoprazole, and esomeprazole. FDA-ap-proved doses (20- and 40-mg omeprazole, 15- and30-mg lansoprazole, 20-mg rabeprazole, 40-mg pan-toprazole, and 40-mg esomeprazole) are for use oncedaily, which provides sufficient acid suppression toeffectively treat most patients. Symptom relief canbe expected in about 78% of cases (range, 62–94%)and esophagitis healing in 83% (range, 71–96%).45

Whether one PPI is superior to the others is con-troversial. For every study showing that one PPI issuperior to another, there is another study showingthe opposite. Overall, based on similar esophagealhealing rates of over 80% at 8 weeks46 and similarintragastric pH profiles after 7 days of dosing,47 allfirst-generation PPIs (omeprazole, lansoprazole, ra-beprazole, pantoprazole) can be considered to haveequivalent effectiveness (Figure 3). Minor differ-ences in pharmacodynamics and price exist.48 How-ever, individual variability in patient response toPPI can vary widely. Therefore, we recommend

Figure 2. Comparison of omeprazole versus raniti-dine in healing reflux esophagitis after 8 weeks oftreatment. Studies by Zeitoun,41 Lundell et al,42

Vantrappen et al,43 and Klinkenberg-Knol et al36

indicate superiority of the PPI versus H2RA. Num-bers indicate dose of omeprazole used in the study.

Tutuian and Castell

311THE AMERICAN JOURNAL OF THE MEDICAL SCIENCES

Page 4: Management of Gastroesophageal Reflux Disease

switching to another PPI as the first step in patientsnot responding to one PPI.

The most recent “second-generation” PPI, esome-prazole, the active S-isomer in the racemic mixtureof omeprazole,49 has been reported to have slightlybetter effect on GERD.50 Results from a large, dou-ble-blind study suggest that the advantages of es-omeprazole become more important in patients withmore severe disease (Figure 4).51

The timing of administering the PPI in relationwith meals is important. The ideal window to takethe PPI is 15 to 30 minutes before meals. This allowsthe medication to be absorbed to be available to theproton pumps when they are activated by the meal.PPIs taken before meals provide better intragastricpH control compared with being taken after themeal.52 Inadequate timing is frequently seen clini-cally, especially when patients are prescribed PPItwice daily without further instructions; patientsfrequently take the medication in the morning andbefore bedtime (without a meal).

Despite the efficacy of single-dose proton pumpinhibitor in controlling intragastric acidity, improv-ing symptoms, and healing of erosive esophagitis,some patients do not heal as well and may requireincreased dosing. In addition, patients with extrae-sophageal presentations (asthma, cough, or laryngi-tis) may require higher doses for effective symptomcontrol.53–55 Rather than doubling the single doseamount, it is preferable to give the PPI twice daily.This recommendation is based on studies in healthysubjects indicating that 20 mg of omeprazole beforebreakfast and before dinner was superior in control-ling intragastric pH compared with 40 mg of ome-prazole before breakfast or before dinner.56

A more recent discovery has been that PPIs maynot achieve adequate control of intragastric pH57;even with twice-daily dosing, they are not alwaysable to control nocturnal acid breakthrough.58 Asingle dose of H2RAs added at bedtime to the PPIcan reduce nocturnal acid breakthrough (Figure5).59 Concerns that combination of PPI and H2RAs

Figure 3. Comparison of first-generation PPIs for short-termtreatment healing rates. Bars indicate percentage healing after 8weeks of treatment. Numbers indicate patients in respectivestudies.

Figure 4. Comparison of esomeprazole versus lan-soprazole in 8-week healing rates of erosive esoph-agitis by baseline grade of esophagitis. The benefitsof esomeprazole are higher in more severe cases ofesophagitis.

Figure 5 . Proportion of patients with nocturnal acid break-through (defined as intragastric pH � 4 for at least 60 continuousminutes) on PPI bid � H2RA at bedtime versus PPI twice per dayalone.35

Management of Gastroesophageal Reflux Disease

312 November 2003 Volume 326 Number 5

Page 5: Management of Gastroesophageal Reflux Disease

might decrease the efficacy of PPIs were cleared bystudies indicating similar intragastric acid controlon daily PPI after placebo or H2RAs the night be-fore.60 Therefore H2RAs are still potentially effec-tive drugs for on-demand therapy of both daytimeand nocturnal GERD symptoms.

Based on existing data we propose the step-uptherapeutic approach to acid suppression guided asillustrated in Table 2. Symptom response to a trial ofPPI therapy is currently a popular recommendeddiagnostic approach to GERD (“PPI-trial”).61 Pa-tients failing PPI trials or not responding to PPItherapy should undergo reflux testing to evaluatethe amount of reflux and its relation to symptoms.For more than 20 years, esophageal pH testing hasbeen the accepted standard for diagnosingGERD.62,63 For optimal study interpretation pa-tients should be off PPI therapy for at least 7 daysbefore undergoing esophageal pH testing. Patientswith GERD who failed to respond to standard PPItreatment because of insufficient dosing might ex-perience symptom exacerbation during this periodthat may help clarify the diagnosis.

An important alternative diagnosis in patientswith persistent symptoms on therapy is the possi-bility of symptomatic nonacid reflux, which will bemissed by conventional pH testing because of thelimitations of this technique in identifying nonacidreflux.64,65 Currently, combined multichannel in-traluminal impedance and pH (MII-pH) is evolvingas dual modality reflux testing. Because MII-pHdetects reflux by changes in intraluminal electricconductivity, both acid and nonacid reflux eventscan be identified.66,67 Preliminary data from a mul-ticenter collaborative study suggest that only 20% ofpatients with persistent symptoms on acid-suppres-sive therapy have their symptoms related to acidreflux. The other 80% usually present a diagnosticdilemma as to whether their symptoms are associ-ated with nonacid reflux or not associated with anytype of GER. Combined MII-pH will further clarify-ing this possible association, including recognitionthat 40% of patients with persistent symptoms ontherapy have no temporal correlation betweensymptoms and any type of reflux. Therefore, webelieve that combined MII-pH should be consideredthe next step in diagnostic management of patientsnot responding to PPI therapy (Figure 6).

As mentioned before, GERD is a chronic diseaserequiring long-standing therapy. Although dailymaintenance therapy on standard-dose PPI sustainsrelapse rates well under 20% for 12 months,68,69

change to H2RAs or placebo will increase the relapseto more than 50 to 70% and 70 to 90%, respective-ly.70,71 Long-term safety and efficacy of standardPPI doses are supported by European studies withpatient follow-up over a decade.72

Promotility Agents (PMAs)The rationale for using PMAs in treatment of

GERD is based on the hypothesis that normalizingunderlying dysmotility or augmenting existing mo-tility would decrease esophageal acid contact time.An overall comment regarding PMAs in GERD isthat as a group, they have limited effectiveness orundesirable side effects.

Bethanechol is a cholinergic agonist that will in-crease esophageal peristalsis and LES pressure butalso stimulate gastric secretion. Compared with pla-cebo, it will improve GERD symptoms but has noadvantages in healing esophagitis.73,74 At the recom-mended dose for treatment of GERD (25 mg 4 timesper day), it may have cholinergic side effects, includ-ing diarrhea, abdominal cramping, fatigue, andblurred vision.

Metoclopramide is a smooth-muscle stimulantthat inhibits dopamine receptors. It enhances gas-tric emptying and LES pressure but has no effect onesophageal peristalsis. Even though it may improveGERD symptoms, it does not show healing rates tojustify its side-effect profile: galactorrhea, men-strual dysfunction, lethargy, and extrapyramidalmotor defects. The most concerning side effect istardive dyskinesia, which can occur in up to 20% ofpatients and can be permanent.75

Cisapride stimulates acetylcholine release, in-creasing LES pressure, aiding esophageal peristal-sis, and accelerating gastric emptying. Placebo-con-trolled trials have shown significant improvements

Table 2. Suggested Approach to Acid Suppressive Therapy

Step Medical regimen

1 Single-dose PPI (AM before meals)2 Switch to another PPI3 PPI AM plus evening (or bedtime) H2RA4 PPI twice daily before meals5 PPI twice daily before meals plus H2RA at bedtime

Figure 6. Suggested diagnostic GERD algorithm.

Tutuian and Castell

313THE AMERICAN JOURNAL OF THE MEDICAL SCIENCES

Page 6: Management of Gastroesophageal Reflux Disease

in GERD symptoms76; because of its cardiovascularside effects, however, it is no longer available.

Tegaserod, a selective 5-HT4 receptor partial ago-nist, is a potent promotility agent throughout thegastrointestinal tract that is also considered to de-crease visceral sensitivity77 and promote gastricemptying.78 In 1 study in GERD patients, it wasshown to decrease postprandial esophageal acid ex-posure79 suggesting a potential role in treatment ofGERD.

Domperidone and erythromycin are the other pro-motility agents currently being investigated fortreatment of GERD. Both agents enhance gastricemptying but do not have significant effects onesophageal peristalsis. Their side effect profiles mayalso limit their clinical utility.

Mucosal Protective AgentsThe role of sucralfate in treatment of GERD has

not been studied as extensively as H2RAs and PPIs.Sucralfate is believed to physically adhere to injuredmucosa and thereby create a protective barrieragainst acid gastric secretions. Randomized compar-isons showed superiority to placebo and healingcomparable with standard dose H2RAs.80

Agents to Reduce TLESRsRecently, transient lower esophageal sphincter re-

laxations (TLESRs) have been recognized to be themajor mechanism of gastroesophageal reflux.81–83

Baclofen, an agonist of �-aminobutyric acid type B,was shown to reduce the rate of postprandialTLESRs and acid reflux episodes in healthy volun-teers84 and patients with reflux esophagitis.85 In amechanistic study using combined MII-pH inhealthy volunteers and patients with GERD, a sin-gle dose of 40 mg of baclofen significantly reduced alltypes (acid and nonacid) of postprandial reflux.86

The side-effect profile of dizziness or nausea mayrestrict its clinical utility.

Surgical Management of GERD

Surgical antireflux procedures are highly effectivetreatment modalities in appropriately selected pa-tients. Before potent acid suppressive therapy be-came available, surgery was considered superior tomedical therapies.87 The rationales for antirefluxsurgery have evolved parallel to clarifications inpathophysiologic mechanisms of reflux disease. Al-though hiatal hernia was considered to be of majorimportance in production of GERD, antireflux sur-gery was performed to reduce the hiatal hernia andkeep the LES within the abdominal cavity.88 Re-ports showing that only 9% of patients with hiatalhernia had typical reflux symptoms89 suggested thatother factors might play a more important role.When low LES pressures were considered the majorfactor in gastroesophageal junction incompetence,

antireflux procedures were done to increase LESpressure.90 At present, given that TLESR is consid-ered the main mechanism by which GERD occurs,surgery is done to lengthen the intraabdominal por-tion of the LES, to reduce the volume of the gastricfundus and prevent effacing of the LES during gas-tric distention in the postprandial period.91

Preoperative evaluation of patients undergoingantireflux surgery includes: esophageal manometry,upper gastrointestinal endoscopy, 24-hour esopha-geal pH monitoring, barium esophagogram, and gas-tric emptying studies.92 This is necessary to selectthe ideal candidates for the procedure, who shouldbe young (because they will require long-term GERDtherapy), should have typical GERD symptoms(heartburn, regurgitation), should have an abnor-mal ambulatory pH test, and should have respondedto PPI therapy. Antireflux procedures should beused with caution in patients with atypical manifes-tations (ie, chest pain, acid taste), in patients notresponding to PPI therapy, and patients with inef-fective esophageal motility. Contraindications toperform surgical interventions are major esophagealmotility abnormalities (ie, achalasia, scleroderma).

Recently, a randomized clinical trial in 310 pa-tients comparing surgery and omeprazole showedsimilar success/failure rates over a 5-year period.93

Results from community hospitals report rates ofcomplications/defective fundoplication (ie, dyspha-gia, 31%; bloating, 46%; flatulence, 67%; and recur-rent esophagitis, 26%) during a 78-month follow-up,94 which underlined the importance of having anexperienced surgeon in a hospital that has a highprocedure volume.

Endoscopic Management of GERD

Recent development in endoscopic techniques pro-posed a series of procedures to treat GERD. Radio-frequency ablation of the lower esophageal sphincter(Stretta procedure) uses a balloon-tipped 4-needlecatheter that delivers radiofrequency (RF) energy tothe smooth muscle of the gastroesophageal junction.The initial proposed mechanism of action was con-sidered to be generation of a scarring tissue thatwould decrease the amount of reflux.95 Subse-quently, it was proposed that RF ablation of the LESmight in fact decrease the number of transient loweresophageal sphincter relaxations.96 This procedureis recommended in patients suffering from chronicheartburn requiring maintenance antisecretorytherapy but without a hiatal hernia �2 cm, severeesophagitis, or complications of gastroesophageal re-flux disease. After the initial success, more recentstudies indicate that the procedure improves symp-toms (ie, severity of GERD, scores on GERD-relatedquestionnaires), but results regarding improvementof esophageal acid exposure are conflicting.97,98

Around the same time, the FDA approved a sec-

Management of Gastroesophageal Reflux Disease

314 November 2003 Volume 326 Number 5

Page 7: Management of Gastroesophageal Reflux Disease

ond endoscopic antireflux technique (EndoCinch)that is based on endoscopic placement of suturesbelow the gastroesophageal junction. This procedureis not indicated in the presence of dysphagia, grade3 or 4 esophagitis, obesity, or hiatal hernia �2 cm inlength. Initial results and recently published fol-low-up studies indicate symptomatic improvementas well as improvement in esophageal acid exposureparameters.99,100 Other endoscopic antireflux proce-dures are currently in advanced stages of evaluationusing injected materials, endoscopic fundoplication,etc.

Summary

Gastroesophageal reflux disease (GERD) is achronic condition requiring long-term treatment.Simple, life-style modifications are the first methodsemployed by patients; because of their low cost andsimplicity, they should be continued even whenmore potent therapies are initiated.

Potent acid-suppressive therapy is currently themost important and successful medical therapy. Al-though healing of esophageal mucosa is achievedwith a single dose of any PPI in more than 80% ofcases, symptoms are more difficult to control. Forsymptom control, additional dosing or combinationtherapy with H2RA might be required. Patientswith persistent symptoms on therapy should betested (preferable with combined MII-pH) for asso-ciation of symptoms with acid, nonacid, or no GER.Long-term follow-up studies indicate that PPIs areeffective, tolerable, and safe medications. So far,PMAs have shown limited efficacy and their side-effect profiles outweigh benefits.

Antireflux surgery, in carefully selected patients(ie, young, typical GERD symptoms, abnormal pHstudy, and good response to PPI) is as effective asPPI therapy and should be offered to these patientsas an alternative to medication. Still, patientsshould be informed about the risks of antirefluxsurgery (ie, risk of postoperative dysphagia; de-creased ability to belch, possibly leading to bloatingand increased flatulence).

Endoscopic antireflux procedures are recom-mended only in selected patients; given the rela-tively short experience with these techniques, pa-tients treated with endoscopic procedures should beenrolled in a rigorous follow-up program.

References

1. Locke GR, Talley NJ, Fett SL, et al. Prevalence andclinical spectrum of gastroesophageal reflux: a populationbased study in Olmsted County, Minnesota. Gastroenterol-ogy 1997;112:1448–56.

2. Sandler RS, Everhart JE, Donowitz M, et al. The bur-den of selected digestive diseases in the United States.Gastroenterology 2002;122:1500–11.

3. Graham DY, Smith JL, Patterson DJ. Why do appar-ently healthy people use antacid tablets? Am J Gastroen-terol 1983;78:257–60.

4. Bennet JR, Castell DO. Overview and symptom assess-ment. In: Castell DO, Richter JE, editors. The esophagus,3rd ed. Philadelphia: Lippincott Williams & Wilkins; 1999.p. 33–43.

5. Goldberg HI, Dodds WJ, Gee S, et al. Role of acid andpepsin in acute experimental esophagitis. Gastroenterology1969;56:223–30.

6. Bennett JR. Symposium on gastrooesophageal reflux andits complications. 5. The physician’s problem. Gut 1973;14:246–9.

7. Stanciu C, Bennett JR. Effects of posture on gastro-oe-sophageal reflux. Digestion 1977;15:104–9.

8. Johnson LF, DeMeester TR. Evaluation of the head of thebed, bethanechol and antacid foam tablets on gastroesoph-ageal reflux. Dig Dis Sci 1981;26:673–80.

9. Khoury RM, Camacho-Lobato L, Katz PO, et al. Influ-ence of spontaneous sleep positions on nighttime recumbentreflux in patients with gastroesophageal reflux disease.Am J Gastroenterol 1999;94:2069–73.

10. Katz LC, Just R, Castell DO. Body position affects recum-bent postprandial reflux. J Clin Gastroenterol 1994;18:280–3.

11. Dent J. Recent views on the pathogenesis of gastro-oesoph-ageal reflux disease. Baillieres Clin Gastroenterol 1987;1:727–45/

12. O’Brien TF. Lower esophageal sphincter pressure (LESP)and esophageal function in obsess humans. J Clin Gastro-enterol 1980;2:145–8.

13. Nebel OT, Castell DO. Lower esophageal sphincter pres-sure changes after ingestion of meals. Gastroenterology1972;63:778–83.

14. Holloway RH, Lyrenas E, Ireland A, et al. Effect ofintraduodenal fat on lower oesophageal sphincter functionand gastro-oesophageal reflux. Gut 1997;40:449–53.

15. Becker DJ, Sinclair J, Castell DO, et al. A comparisonbetween high and low fat meals on postprandial esophagealacid exposure. Am J Gastroenterol 1989;84:782–6.

16. Murphy DW, Castell DO. Chocolate and heartburn: evi-dence of increased acid exposure after chocolate ingestion.Am J Gastroenterol 1988;83:633–6.

17. Vitale GC, Cheadle WG, Patel B, et al. The effect of alcoholon nocturnal gastroesophageal reflux. JAMA 1987;258:2077–9.

18. Stanciu C, Bennett JR. Smoking and gastro-oesophagealreflux. Br Med J 1972;3:793–5.

19. Dennish GW, Castell DO. Inhibitory effect of smoking onthe lower esophageal sphincter. N Engl J Med 1971;284:1136–7.

20. Weberg R, Berstad A. Symptomatic effect of a low doseantacid regimen in reflux oesophagitis. Scand J Gastroen-terol 1989;24:401–6.

21. Graham DY, Patterson DJ. Double-blind comparison ofliquid antacid and placebo in the treatment of symptomaticreflux esophagitis. Dig Dis Sci 1983;28:559–63.

22. Graham DY, Lanza F, Dorsch ER. Symptomatic refluxesophagitis: a double-blind controlled comparison of antac-ids and alginate. Curr Ther Res 1977;22:653–8.

23. Mandel KG, Daggy BP, Brodie DA, et al. Review article:alginate-raft formulations in the treatment of heartburnand acid reflux. Aliment Pharmacol Ther 2000;14:669–90.

24. Castell DO, Dalton CB, Becker D, et al. Alginic aciddecreases postprandial upright gastroesophageal reflux.Comparison with equal strength antacid. Dig Dis Sci 1992;37:589–93.

25. Gottlieb S, Decktor DL, Eckert JM, et al. Efficacy andtolerability of famotidine in preventing heartburn and re-

Tutuian and Castell

315THE AMERICAN JOURNAL OF THE MEDICAL SCIENCES

Page 8: Management of Gastroesophageal Reflux Disease

lated symptoms of upper gastrointestinal discomfort. Am JTher 1995;2:314–9.

26. Kovacs TOC. The action of low-dose famotidine vs. pre-scription doses of cimetidine and ranitidine on human gas-tric acid secretion as titrated by sodium hydroxide: a place-bo-controlled study. Pract Gastroenterol 1996;20:S5.

27. Reilly TG, Singh S, Cottrell J, et al. Low dose famotidineand ranitidine as single post-prandial doses: a three-periodplacebo-controlled comparative trial. Aliment PharmacolTher 1996;10:749–55.

28. Blum AL. Treatment of acid-related disorders with gastricacid inhibitors; the state of the art. Digestion 1990;47 Suppl1:3–10.

29. Robinson M. Medical management of gastroesophagealreflux disease. In: Castell DO, Richter JE, editors. Theesophagus, 3rd ed. Philadelphia: Lippincott Williams &Wilkins; 1999. p. 447–462.

30. Bell NJ, Hunt RH. Role of gastric acid suppression in thetreatment of gastro-oesophageal reflux disease. Gut 1992;33:118–24.

31. Roufail W, Belisto A, Robinson M, et al. Ranitidine forerosive esophagitis: a double-blind, placebo-controlledstudy. Glaxo Erosive Esophagitis Study Group. AlimentPharmacol Ther 1992;6:597–607.

32. Wesdorp IC, Dekker W, Festen HP. Efficacy of famoti-dine 20mg twice a day versus 40mg twice a day in thetreatment of erosive or ulcerative reflux esophagitis. Dig DisSci 1993;38:2287–93.

33. Sontag SJ. Rolling review: gastro-oesophageal reflux dis-ease. Aliment Pharmacol Ther 1993;7:293–312.

34. Pappa KA, Gooch WM, Buaron K, et al. Low dose rani-tidine for the relief of heartburn. Aliment Pharmacol Ther1999;13:459–65.

35. Xue S, Katz PO, Banerjee P, et al. Bedtime H2 blockersimprove nocturnal gastric acid control in GERD patients onproton pump inhibitors. Aliment Pharmacol Ther 2001;15:1351–6.

36. Klinkenberg-Knoll EC, Jansen JM, Festen HP, et al.Double-blind multicentre comparison of omeprazole and ra-nitidine in the treatment of reflux oesophagitis. Lancet1987;14:349–51.

37. Marks RD, Richter JE, Rizzo J, et al. Omeprazole versusH2-receptor antagonists in treating patients with pepticstricture and esophagitis. Gastroenterology 1994;106:907–15.

38. Bate CM, Green JR, Axon AT, et al. Omeprazole is moreeffective than cimetidine for the relief of all grades of gastro-esophageal reflux disease-associated heartburn, irrespectiveof the presence or absence of endoscopic esophagitis. Ali-ment Pharmacol Ther 1997;11:755–63.

39. Richter JE, Campbell DR, Kahrilas PJ, et al. Lansopra-zole compared with ranitidine for the treatment of non-erosive gastroesophageal reflux disease. Arch Intern Med2000;160:1803–9.

40. Bate CM, Green JR, Axon AT, et al. Omeprazole is moreeffective than cimetidine in the prevention of recurrence ofGERD-associated heartburn and the occurrence of underly-ing oesophagitis. Aliment Pharmacol Ther 1998;12:41–7.

41. Zeitoun P. Comparison of omeprazole with ranitidine inthe treatment of reflux oesophagitis. Scand J GastroenterolSuppl 1989;166:83–7.

42. Sandmark S, Carlsson R, Fausa O, et al. Omeprazole orranitidine in the treatment of reflux esophagitis. Results ofa double-blind, randomized, Scandinavian multicenterstudy. Scand J Gastroenterol 1988;23:625–32.

43. Vantrappen G, Rutgeerts L, Schurmans P, et al. Ome-prazole (40 mg) is superior to ranitidine in short-term treat-ment of ulcerative reflux esophagitis. Dig Dis Sci 1988;33:523–9.

44. Richardson P, Hawkey CJ, Stack WA. Proton pumpinhibitors. Pharmacology and rationale for use in gastroin-testinal disorders. Drugs 1998;56:307–35.

45. DeVault KR. Overview of medical therapy for gastroesoph-ageal reflux disease. Gastroenterol Clin North Am 1999;28:831–46.

46. Caro JJ, Salas M, Ward A. Healing and relapse rates ingastroesophageal reflux disease treated with the newer pro-ton-pump inhibitors lansoprazole, rabeprazole, and panto-prazole compared with omeprazole, ranitidine, and placebo:evidence from randomized clinical trials. Clin Ther 2001;23:998–1017.

47. Tutuian R, Katz PO, Castell DO. A PPI is a PPI is a PPI:lessons from prolonged ambulatory pH monitoring [ab-stract]. Gastroenterology 2000;118 Suppl 2:A17.

48. Horn J. The proton-pump inhibitors: similarities and dif-ferences. Clin Ther 2000;22:266–80.

49. Scott LJ, Dunn CJ, Mallarkey G, et al. Esomeprazole: areview of its use in the management of acid-related disor-ders. Drugs 2002;62:1503–38.

50. Edwards SJ, Lind T, Lundell L. Systematic review ofproton pump inhibitors for the acute treatment of refluxoesophagitis. Aliment Pharmacol Ther 2001;15:1729–36.

51. Castell DO, Kahrilas PJ, Richter JE, et al. Esomepra-zole (40 mg) compared with lansoprazole (30 mg) in thetreatment of erosive esophagitis. Am J Gastroenterol 2002;97:575–83.

52. Khoury RM, Katz PO, Castell DO. Post-prandial raniti-dine is superior to post-prandial omeprazole in control ofgastric acidity in healthy volunteers. Aliment PharmacolTher 1999;13:1211–4.

53. Achem SR, Kolts BE, MacMath T, et al. Effects of ome-prazole versus placebo in treatment of noncardiac chest painand gastroesophageal reflux. Dig Dis Sci 1997;42:2138–45.

54. Katz PO, Castell DO. Medical therapy of supraesophagealreflux disease. Am J Med 2000;108:170S–7S.

55. Harding SM, Richter JE, Bradley LA, et al. Asthma andgastroesophageal reflux: acid suppression therapy improvesasthma outcome. Am J Med 1996;100:395–405.

56. Kuo B, Castell DO. Optimal dosing of omeprazole 40mgdaily: effects on gastric and esophageal pH and serum gas-trin in healthy controls. Am J Gastroenterol1996;91:1532–8.

57. Hartmann M, Theiss U Huber R, et al. Twenty-four-hourpH profiles and pharmacokinetics following single and re-peated oral administration od the proton pump inhibitorpantoprazole in comparison to omeprazole. Aliment Phar-macol Ther 1996;10:359–66.

58. Katz PO, Hatlebakk JG, Castell DO. Gastric acidity andacid breakthrough with twice daily omeprazole or lansopra-zole. Aliment Pharmacol Ther 2000;14:709–14.

59. Peghini PL, Katz PO, Castell DO. Ranitidine controlsnocturnal gastric acid breakthrough on omeprazole: a con-trolled study in normal subjects. Gastroenterology 1998;115:1335–9.

60. Tutuian R, Katz PO, Ahmed F, et al. Over-the-counterH2-receptor antagonists do not compromise intragastric pHcontrol with proton pump inhibitors. Aliment PharmacolTher 2002;16:473–7.

61. Fass R. Empirical trials in treatment of gastroesophagealreflux disease. Dig Dis 2000;18:20–6.

Management of Gastroesophageal Reflux Disease

316 November 2003 Volume 326 Number 5

Page 9: Management of Gastroesophageal Reflux Disease

62. Johnson LF, DeMeester TR. Twenty-four-hour pH mon-itoring of the distal esophagus. A quantitative measure ofgastroesophageal reflux. Am J Gastroenterol 1974;62:325–32.

63. DeVault KR, Castell DO. Updated guidelines for the diag-nosis and treatment of gastroesophageal reflux disease.Am J Gastroenterol 1999;94:1434–42.

64. Washington N, Steele RJC, Jackson SJ, et al. Patternsof food and acid reflux with low-grade esophagitis –the roleof an anti-reflux agent. Aliment Pharmacol Ther 1998;12:53–8.

65. Shay SS, Egli D, Johnson LF. Simultaneous esophagealpH monitoring and scintigraphy during the postprandialperiod in patients with severe reflux esophagitis. Dig Dis Sci1991;36:558–64.

66. Sifrim D, Holloway R, Silny J, et al. Acid, nonacid, andgas reflux in patients with gastroesophageal reflux diseaseduring ambulatory 24-hour pH-impedance recordings. Gas-troenterology 2001;120:1588–98.

67. Vela MF, Camacho-Lobato L, Srinivasan R, et al. Si-multaneous intraesophageal impedance and pH measure-ment of acid and nonacid gastroesophageal reflux: effect ofomeprazole. Gastroenterology 2001;120:1599–606.

68. Dent J, Yeomans ND, Mackinnon M, et al. Omeprazolevs ranitidine for prevention of relapse in reflux esophagitis:a controlled double blind trial of their efficacy and safety.Gut 1994;35:590–8.

69. Hallerback B, Unge P, Carling L, et al. The Scandina-vian Clinics for United Research Group. Omeprazole orranitidine in long-term treatment of reflux esophagitis. Gas-troenterology 1994;107:1305–11.

70. Robinson M, Lanza F, Avner D, et al. Effective mainte-nance treatment of reflux esophagitis with low-dose lanso-prazole: a randomized, double-blind, placebo-controlledtrial. Ann Intern Med 1996;124:859–67.

71. Gough AL, Long RG, Cooper BT, et al. Lansoprazoleversus ranitidine in the maintenance treatment of refluxesophagitis. Aliment Pharmacol Ther 1996;10:529–39.

72. Klinkenberg-Knol EC, Nelis F, Dent J, et al. Long-termomeprazole treatment in resistant gastroesophageal refluxdisease: efficacy, safety, and influence on gastric mucosa.Gastroenterology 2000;118:661–9.

73. Farrell RL, Roling GT, Castell DO. Cholinergic therapyof chronic heartburn. A controlled trial. Ann Intern Med1974;80:573–6.

74. Ramirez B, Richter JE. Promotility drugs in treatment ofgastro-oesophageal reflux disease. Aliment Pharmacol Ther1993;7:5–20.

75. Albibi R, McCallum RW. Metoclopramide: pharmacologyand clinical application. Ann Intern Med 1983;98:86–95.

76. Castell DO, Sigmund C Jr., Patterson D, et al. Cisapride20 mg b. i. d. provides symptomatic relief of heartburn andrelated symptoms of chronic mild to moderate gastroesoph-ageal reflux disease. CIS-USA-52 Investigator Group. Am JGastroenterol 1998;93:547–52.

77. Muller-Lissner SA, Fumagalli I, Bardhan KD, et al.Tegaserod, a 5-HT4 receptor partial agonist, relieves symp-toms in irritable bowel syndrome patients with abdominalpain, bloating and constipation. Aliment Pharmacol Ther2001;15:1655–66.

78. Degen L, Matzinger D, Merz M, et al. Tegaserod, a 5-HT4receptor partial agonist, accelerates gastric emptying andgastrointestinal transit in healthy male subjects. AlimentPharmacol Ther 2001;15:1745–51.

79. Kahrilas PJ, Quigley EM, Castell DO, et al. The effectsof tegaserod (HTF 919) on oesophageal acid exposure in

gastro-oesophageal reflux disease. Aliment Pharmacol Ther2000;14:1503–9.

80. Hameeteman W. Clinical studies of sucralfate in refluxesophagitis: the European experience. J Clin Gastroenterol1991;13 Suppl 2:S16–20.

81. Dent J, Dodds WJ, Friedman RH, et al. Mechanism ofgastroesophageal reflux in recumbent asymptomatic humansubjects. J Clin Invest 1980;65:256–67.

82. Dodds WJ, Dent J, Hogan WJ, et al. Mechanisms ofgastroesophageal reflux in patients with reflux esophagitis.N Engl J Med 1982;307:1547–52.

83. Mittal RK, Holloway RH, Penagini R, et al. Transientlower esophageal relaxation. Gastroenterology 1995;109:601–10.

84. Lidums I, Lehmann A, Checklin H, et al. Control oftransient lower esophageal sphincter relaxations and refluxby the GABAB agonist baclofen in normal subjects. Gastro-enterology 2000;118:7–13.

85. Zhang Q, Lehmann A, Rigda R, et al. Control of transientlower oesophageal sphincter relaxations and reflux by theGABAB agonist baclofen in patients with gastrooesophagealreflux disease. Gut 2002;50:19–24.

86. Vela MF, Tutuian R, Katz PO, et al. Baclofen decreasesacid and non-acid post-prandial gastro-oesophageal refluxmeasured by combined multichannel intraluminal imped-ance and pH. Aliment Pharmacol Ther 2003;17:243–51.

87. Behar J, Sheahan DG, Biancani P, et al. Medical andsurgical management of reflux esophagitis. A 38-month re-port of a prospective clinical trial. N Engl J Med 1975;293:263–8.

88. DeMeester TR, Lafontaine E, Joelsson BE, et al. Rela-tionship of a hiatal hernia to the function of the body of theesophagus and the gastroesophageal junction. J Thorac Car-diovasc Surg 1981;82:547–58.

89. Palmer ED. The hiatus hernia-esophagitis-esophagealstricture complex. Twenty-year prospective study. Am JMed 1968;44:566–79.

90. Hinder RA, Filipi CJ, Wetscher G, et al. LaparoscopicNissen fundoplication is an effective treatment for gastro-esophageal reflux disease. Ann Surg 1994;220:472–81.

91. Korn O, Csendes A, Burdiles P, et al. Anatomic dilata-tion of the cardia and competence of the lower esophagealsphincter: a clinical and experimental study. J GastrointestSurg 2000;4:398–406.

92. Branton SA, Hinder RA, Floch NR, et al. Surgical treat-ment of gastroesophageal reflux disease. In: Castell DO,Richter JE, editors. The esophagus, 3rd ed. Philadelphia:Lippincott Williams & Wilkins; 1999. p. 511–25.

93. Lundell L, Miettinen P, Myrvold HE, et al. Continued(5-year) follow-up of a randomized clinical study comparingantireflux surgery and omeprazole in gastroesophageal re-flux disease. J Am Coll Surg 2001;192:172–9.

94. Rantanen TK, Halme TV, Luostarinen ME, et al. The longterm results of open antireflux surgery in a community-basedhealth care center. Am J Gastroenterol 1999;94:1777–81.

95. Triadafilopoulos G, Dibaise JK, Nostrant TT, et al.Radiofrequency energy delivery to the gastroesophagealjunction for the treatment of GERD. Gastrointest Endosc2001;53:407–15.

96. Kim MS, Holloway RH, Dent J, et al. Radiofrequencyenergy delivery to the gastric cardia inhibits triggering oftransient lower esophageal sphincter relaxation and gastro-esophageal reflux in dogs. Gastrointest Endosc 2003;57:17–22.

97. Triadafilopoulos G, DiBaise JK, Nostrant TT, et al.The Stretta procedure for the treatment of GERD: 6 and 12

Tutuian and Castell

317THE AMERICAN JOURNAL OF THE MEDICAL SCIENCES

Page 10: Management of Gastroesophageal Reflux Disease

month follow-up of the U. S. open label trial GastrointestEndosc 2002;55:149–56.

98. DiBaise JK, Brand RE, Quigley EM. Endoluminal deliv-ery of radiofrequency energy to the gastroesophageal junc-tion in uncomplicated GERD: efficacy and potential mecha-nism of action. Am J Gastroenterol 2002;97:833–42.

99. Filipi CJ, Lehman GA, Rothstein RI, et al. Transoral,flexible endoscopic suturing for treatment of GERD: a mul-ticenter trial. Gastrointest Endosc 2001;53:416–22.

100. Mahmood Z, McMahon BP, Arfin Q, et al. Endocinchtherapy for gastro-oesophageal reflux disease: a one yearprospective follow up. Gut 2003;52:34–9.

Management of Gastroesophageal Reflux Disease

318 November 2003 Volume 326 Number 5