Trajectory assessment is useful when day-to-day esophageal acid exposure varies in prolonged wireless pH monitoring

The Optimal Duration of pH Monitoring: Testing the Validity of Lyon 2.0 Recommendations for Wireless pH Measurement

BACKGROUND & AIMS

The Lyon 2.0 consensus recommends 96-hour wireless pH studies for gastroesophageal reflux disease (GERD) diagnosis; however, the optimal length of pH measurement has not been established. Further, it is uncertain if, and under what circumstances, shorter recording times are sufficient for a conclusive diagnosis.

METHODS

Data from 944 patients with 4-day recordings was reviewed. Patients were classified at 24, 48, and 72 hours against the 96-hour reference standard. Acid exposure time (AET) <4% was conclusively negative, and AET >6% was conclusively positive for GERD. Esophagitis was an independent marker of disease. The effect of utilizing average day, worst day, and dominant-pattern analysis (≥2 negative or positive days) was compared. Groups defined by AET thresholds from 1% to 7% at 24 and 48 hours were followed to assess when short recording periods were sufficient for conclusive diagnosis.

RESULTS

Diagnostic accuracy improved with study duration (P < .00001). The proportion of patients with inconclusive results (AET 4%-6%) reduced from 113 of 944 at 24 hours to 40 of 113 at 96 hours (35% of subgroup; P = .02), with similar results for dominant pattern analysis. Diagnostic sensitivity for 24-, 48-, and 72-hour pH-monitoring for AET 6% threshold increased with study duration from 62.5% to 76.6% and 88.2%, respectively, when compared with the 96-hour reference standard.

CONCLUSION

The results of this analysis validate the recommendation that prolonged reflux studies of at least 72 hours duration provide optimal AET measurements for GERD diagnosis. Prolonging studies can also resolve inconclusive results based on 24- and 48-hour studies.

A scientometrics analysis and visualization of refractory gastroesophageal reflux disease

Background

Refractory gastroesophageal reflux disease (refractory GERD) is a heterogeneous disease characterized by unresponsiveness or poor efficacy to proton-pump inhibitors (PPIs). This chronic disorder substantially weakens patients' mental wellbeing and quality of life, increasing the financial burden on society. Multiple articles have been reported in this area. However, literature involving scientometric analysis of refractory GERD is absent. Therefore, it is necessary to understand the evolution of research themes and the main hotspots of refractory GERD through bibliometric methods.

Methods

All documents related to refractory GERD based on the WOS Core Collection from January 2000 to November 2023 were selected for analysis. Citespace V 6.1 R6, VOSviewer V 1.6.20, and Scimago Graphica V 1.0.38 were used to perform bibliometric analysis.

Results

We collected a total of 241 research articles from 36 countries and 322 institutions, contributed by over 1,000 authors. Over the last 20 years, the number of articles in this field has increased year by year, and since 2011, the number of publications has increased dramatically, with 85.89% of the papers. These countries are led by the United States and Japan. GUT had the highest number of citations and DIGESTION had the highest number of publications. Research on standardized diagnosis and management, mechanisms, novel monitoring methods, and innovative drugs and procedures for refractory GERD are the main topics and hotspots in this field. This study also found that neuroimmune interaction is closely related to refractory GERD, which may be a new direction for future mechanism research.

Conclusion

Our study is the first bibliometric analysis of the global literature on refractory GERD. This research provides valuable insights for researchers, enabling them to quickly understand the research frontier and hot topics of this field.

Diagnostic Yield of Ambulatory Reflux Monitoring Systems for Evaluation of Chronic Laryngeal Symptoms

INTRODUCTION

Among patients with chronic laryngeal symptoms, ambulatory reflux monitoring off acid suppression is recommended to evaluate for laryngopharyngeal reflux (LPR). However, reflux monitoring systems are diverse in configuration and monitoring capabilities, which present a challenge in creating a diagnostic reference standard in these patients. This study aimed to compare diagnostic yield and performance between reflux monitoring systems in patients with chronic laryngeal symptoms.

METHODS

This multicenter, international study of adult patients referred for evaluation of LPR over a 5-year period (March 2018-May 2023) assessed and compared diagnostic yield of pathologic gastroesophageal reflux (GER+) on ambulatory reflux monitoring off acid suppression.

RESULTS

Of 813 patients, 296 (36%) underwent prolonged wireless pH, 532 (65%) underwent 24-hour pH-impedance monitoring, and 15 (2%) underwent both tests. Overall diagnostic yield for GER+ was 36% and greater for prolonged wireless pH compared with that for 24-hour pH-impedance monitoring (50% vs 27%; P < 0.01). Among 15 patients who underwent both prolonged wireless pH and 24-h pH-impedance monitoring, concordance between systems for GER+ was 40%. The most common source of discordance was strong evidence of GER+ across multiple days on prolonged wireless pH compared with no evidence of GER+ on pH-impedance.

DISCUSSION

In this multicenter international study of patients with chronic laryngeal symptoms referred for LPR evaluation, diagnostic yield of ambulatory reflux monitoring off acid suppression was 36% and rose to 50% when using wireless pH monitoring. In patients referred for chronic laryngeal symptoms, 24-hour pH-impedance monitoring may risk a low negative predictive value in patients with unproven GER+ disease.

Review article: Diagnosis and management of laryngopharyngeal reflux

BACKGROUND

Laryngopharyngeal reflux has classically referred to gastroesophageal reflux leading to chronic laryngeal symptoms such as throat clearing, dysphonia, cough, globus sensation, sore throat or mucus in the throat. Current lack of clear diagnostic criteria significantly impairs practitioners' ability to identify and manage laryngopharyngeal reflux.

AIMS

To discuss current evidence-based diagnostic and management strategies in patients with laryngopharyngeal reflux.

METHODS

We selected studies primarily based on current guidelines for gastroesophageal reflux disease and laryngopharyngeal reflux, and through PubMed searches.

RESULTS

We assess the current diagnostic modalities that can be used to determine if laryngopharyngeal reflux is the cause of a patient's laryngeal symptoms, as well as review some of the common treatments that have been used for these patients. In addition, we note that the lack of a clear diagnostic gold-standard, as well as specific diagnostic criteria, significantly limit clinicians' ability to determine adequate therapies for these patients. Finally, we identify areas of future research that are needed to better manage these patients.

CONCLUSIONS

Patients with chronic laryngeal symptoms are complex due to the heterogenous nature of symptom pathology, inconsistent definitions and variable response to therapies. Further outcomes data are critically needed to help elucidate ideal diagnostic workup and therapeutic management for these challenging patients.

Updates to the modern diagnosis of GERD: Lyon consensus 2.0

The Lyon Consensus provides conclusive criteria for and against the diagnosis of gastro-oesophageal reflux disease (GERD), and adjunctive metrics that consolidate or refute GERD diagnosis when primary criteria are borderline or inconclusive. An international core and working group was assembled to evaluate research since publication of the original Lyon Consensus, and to vote on statements collaboratively developed to update criteria. The Lyon Consensus 2.0 provides a modern definition of actionable GERD, where evidence from oesophageal testing supports revising, escalating or personalising GERD management for the symptomatic patient. Symptoms that have a high versus low likelihood of relationship to reflux episodes are described. Unproven versus proven GERD define diagnostic strategies and testing options. Patients with no prior GERD evidence (unproven GERD) are studied using prolonged wireless pH monitoring or catheter-based pH or pH-monitoring off antisecretory medication, while patients with conclusive GERD evidence (proven GERD) and persisting symptoms are evaluated using pH-impedance monitoring while on optimised antisecretory therapy. The major changes from the original Lyon Consensus criteria include establishment of Los Angeles grade B oesophagitis as conclusive GERD evidence, description of metrics and thresholds to be used with prolonged wireless pH monitoring, and inclusion of parameters useful in diagnosis of refractory GERD when testing is performed on antisecretory therapy in proven GERD. Criteria that have not performed well in the diagnosis of actionable GERD have been retired. Personalisation of investigation and management to each patient's unique presentation will optimise GERD diagnosis and management.

Functional lumen imaging probe topography identifies patients with normal acid exposure and esophageal hypervigilance amongst proton-pump inhibitor non-responders

BACKGROUND

Multiple factors contribute to symptom generation and treatment response in proton-pump inhibitor non-responders (PPI-NRs). We aimed to test whether PPI-NRs with normal acid exposure have a higher degree of esophageal hypersensitivity and hypervigilance and can be identified using functional lumen imaging probe (FLIP) topography at the time of endoscopy.

METHODS

Data from PPI-NRs whom underwent endoscopy, FLIP and wireless 96-h pH-metry were retrospectively analyzed. Patients were grouped according to acid exposure time (AET) as (a) 0 days abnormal (AET > 6%), (b) 1-2 days abnormal, or (c) 3-4 days abnormal. The esophageal hypervigilance and anxiety scale (EHAS) score and other symptom scores were compared between groups. The discriminatory ability of the esophagogastric junction (EGJ) distensibility index (DI) and max EGJ diameter in identifying patients with 0 days abnormal AET was tested via receiver-operating-characteristic (ROC) curve analysis.

RESULTS

EHAS score was 38.6 in the 0 days abnormal AET group, 30.4 in the 1-2 days abnormal AET group (p = 0.073 when compared to 0 days abnormal) and 28.2 in the 3-4 days abnormal AET group (p = 0.031 when compared to 0 days abnormal). Area-under-the-curve (AUC) for the DI in association with 0 days AET > 6% was 0.629. A DI of < 2.8 mm2/mmHg had a sensitivity of 83.3%, and negative predictive value of 88% in classifying patients with 0 days abnormal acid exposure (p = 0.004).

CONCLUSIONS

FLIP complements prolonged wireless pH-metry in distinguishing the subset of PPI-NRs with completely normal acid exposure and a higher burden of esophageal hypervigilance. Proper identification of patients along the functional heartburn spectrum can improve overall surgical outcomes.

Diagnostic thresholds and optimal collection protocol of salivary pepsin for gastroesophageal reflux disease

Gastroesophageal reflux disease (GERD) is primarily diagnosed based on symptoms and response to a proton-pump inhibitor (PPI) trial. Gold standard testing requires an invasive endoscopic procedure, often with ambulatory pH monitoring. Salivary pepsin is a potential noninvasive modality for GERD diagnosis. This study aimed to assess diagnostic performance of salivary pepsin thresholds for GERD and determine optimal collection protocol of saliva in an external validation cohort. Over 10 months, adults with symptoms of GERD undergoing esophagogastroduodenoscopy with wireless pH-monitoring off PPI were enrolled. Saliva was self-collected by participants over 4 days across three different time points: fasting ante meridiem (AM), post-prandial, and bedtime (PM). Pepsin levels were calculated via Peptest. Pepsin variability and agreement were determined using linear mixed effects models and intraclass correlation. Validation of diagnostic threshold and performance characteristics were evaluated by receiver-operator curve analysis. Twenty participants enrolled in the study; 50% with physiologic acid exposure (acid exposure time < 4% no GERD) and 50% with elevated acid exposure (GERD). Mean pepsin concentrations were significantly lower in the AM (22.6 ± 25.2 ng/mL) compared to post-prandial (44.5 ± 36.7 ng/mL) and PM (55.4 ± 47.0 ng/mL). Agreement between pepsin concentrations across 3 days was substantial for AM samples (kappa 0.61), with lower agreement for post-prandial and PM samples. A single AM pepsin concentration of 25 ng/mL was 67% accurate for GERD with 56% sensitivity and 78% specificity. This validation study highlights fair accuracy and performance characteristics of a single fasting AM salivary pepsin concentration for the diagnosis of GERD.

Editorial: wireless pH-monitoring - is it time to put away the pH-impredance catheters: Authors' response

LINKED CONTENT

This article is linked to Yadlapati et al papers. To view these articles, visit https://doi.org/10.1111/apt.17180 and https://doi.org/10.1111/apt.17204

Optimal Wireless Reflux Monitoring Metrics to Predict Discontinuation of Proton Pump Inhibitor Therapy

INTRODUCTION

Ambulatory reflux monitoring performed off proton pump inhibitor (PPI) is the gold standard diagnostic test for nonerosive gastroesophageal reflux disease (GERD). However, the diagnostic metrics and optimal duration of monitoring are not well defined. This study evaluated the performance of multiple metrics across distinct durations of wireless reflux monitoring off PPI against the ability to discontinue PPI therapy in patients with suboptimal PPI response.

METHODS

This single-arm clinical trial performed over 4 years at 2 centers enrolled adults with troublesome GERD symptoms and inadequate response to > 8 weeks of PPI. Participants underwent 96-hour wireless pH monitoring off PPI. Primary outcome was whether the subject successfully discontinued PPI or resumed PPI within 3 weeks.

RESULTS

Of 132 participants, 30% discontinued PPI. Among multiple metrics assessed, total acid exposure time (AET) of 4.0% performed best in predicting PPI discontinuation (odds ratio 2.9 [95% confidence interval 1.4, 6.4]; P = 0.006), with other thresholds of AET and DeMeester score performing comparably. AET was significantly higher on day 1 of monitoring compared with other days, and prognostic performance significantly declined when only assessing the first 48 hours of monitoring (area under the curve for 96 hours 0.63 vs area under the curve for 48 hours 0.57; P = 0.01).

DISCUSSION

This clinical trial highlights the AET threshold of 4.0% as a high-performing prognostic marker of PPI discontinuation. 96 hours of monitoring performed better than 48 hours, in predicting ability to discontinue PPI. These data can inform current diagnostic approaches for patients with GERD symptoms who are unresponsive to PPI therapy.

Clinical role of ambulatory reflux monitoring in PPI non-responders: recommendation statements

BACKGROUND

Optimal ambulatory reflux monitoring methodology in symptomatic reflux patients continues to be debated.

AIMS

To utilise published literature and expert opinion to develop recommendation statements addressing use of ambulatory reflux monitoring in clinical practice METHODS: The RAND Appropriateness Method (RAM) was utilised among 17 experts with discussion, revision and two rounds of ranking of recommendation statements. Ambulatory reflux monitoring protocol, methodology and thresholds ranked as appropriate by ≥80% of panellists met the criteria for appropriateness.

RESULTS

Prolonged (96-h recommended) wireless pH monitoring off proton pump inhibitor (PPI) was identified as the appropriate diagnostic tool to assess the need for acid suppression in patients with unproven gastro-oesophageal reflux disease (GERD) and persisting typical reflux symptoms despite once-daily PPI. Acid exposure time (AET) <4.0% on all days of monitoring with negative reflux-symptom association excludes GERD and does not support ongoing PPI treatment. Conversely, AET >6.0% across ≥2 days is conclusive evidence for GERD and supports treatment for GERD, while AET >10% across ≥2 days identifies severe acid burden that supports escalation of anti-reflux treatment. In previously proven GERD, impedance-pH monitoring on PPI is helpful in defining refractory GERD and mechanisms of continued symptoms; the presence of <40 reflux events, AET <2.0% and a negative reflux-symptom association does not support escalation of anti-reflux treatment. In contrast, AET > 4.0% and positive reflux-symptom association support escalation of anti-reflux treatment, including use of invasive therapeutics.

CONCLUSIONS

Statements meeting appropriateness for average clinical care have been identified when utilising reflux monitoring in patients with typical reflux symptoms and PPI non-response.

Factors that Impact Day-to-Day Esophageal Acid Reflux Variability and Its Diagnostic Significance for Gastroesophageal Reflux Disease

Gastroesophageal reflux disease (GERD) is a common disease affecting a significant number of adults both globally and in the USA. GERD is clinically diagnosed based on patient-reported symptoms, and the gold standard for diagnosis is ambulatory reflux monitoring, a tool particularly utilized in the common scenario of non-response to therapy or atypical features. Over the past 20 years, there has been a shift toward extending the duration of reflux monitoring, initially from 24 to 48 h and more recently to 96 h, primarily based on a demonstrated increase in diagnostic yield. Further, multiple studies demonstrate clinically relevant variability in day-to-day acid exposure levels in nearly 30% of ambulatory reflux monitoring studies. For these reasons, an ongoing clinical dilemma relates to the optimal activities patients should engage in during prolonged reflux monitoring. Thus, the aims of this review are to detail what is known about variability in daily acid exposure, discuss factors that are known to influence this day-to-day variability (i.e., sleep patterns, dietary/eating habits, stress, exercise, and medications), and finally provide suggestions for patient education and general GERD management to reduce variation in esophageal acid exposure levels.

Esophageal hypervigilance is prevalent across gastroesophageal reflux disease presentations

BACKGROUND

There is a need to identify factors outside of abnormal reflux that contribute to gastroesophageal reflux disease (GERD). Esophageal hypervigilance is a psychological process impacting symptom experience in esophageal disease. However, little is known about the presence of hypervigilance in GERD phenotypes, especially in those with abnormal acid exposure or symptom index scores. The primary aim was to assess differences in self-reported esophageal hypervigilance across different GERD presentations. The secondary aim was to evaluate esophageal hypervigilance as a predictor of symptom severity.

METHODS

We conducted retrospective data analyses on a cohort of adult patients with reflux symptoms that underwent 96-hour wireless pH monitoring from 9/2015 to 9/2017. Patients were stratified into groups based on the number of days they exhibited positive acid exposure time (AET; 0 days, 1-2 days, 3+ days), and symptom index scores (SI; 0 days, 1-day, 2+ days). Esophageal hypervigilance and anxiety, and symptom frequency and severity were assessed between groups.

KEY RESULTS

A total of 123 AET cases and 116 SI cases were included for analysis. Esophageal hypervigilance and anxiety scores did not significantly differ based on the number of days of positive AET (p = 0.311) or SI (p = 0.118). Symptom severity and perceived symptom frequency differed between groups. Hypervigilance significantly predicted symptom severity, when controlling for symptom-specific anxiety.

CONCLUSIONS

Esophageal hypervigilance is persistent across patients with reflux, irrespective of acid burden and symptom index, and significantly predicts symptom severity. Hypervigilance should be considered as an independent factor contributing to esophageal symptom perception.

Prolonged Wireless pH Monitoring in Patients With Persistent Reflux Symptoms Despite Proton Pump Inhibitor Therapy

BACKGROUND & AIMS

Wireless pH monitoring measures esophageal acid exposure time (AET) for up to 96 hours. We evaluated competing methods of analysis of wireless pH data.

METHODS

Adult patients with persisting reflux symptoms despite acid suppression (n = 322, 48.5 ± 0.9 years, 61.7% women) from 2 tertiary centers were evaluated using symptom questionnaires and wireless pH monitoring off therapy, from November 2013 through September 2017; 30 healthy adults (control subjects; 26.9 ± 1.5 years; 60.0% women) were similarly evaluated. Concordance of daily AET (physiologic <4%, borderline 4%-6%, pathologic>6%) for 2 or more days constituted the predominant AET pattern. Each predominant pattern (physiologic, borderline, or pathologic) in relation to data from the first day, and total averaged AET, were compared with other interpretation paradigms (first 2 days, best day, or worst day) and with symptoms.

RESULTS

At least 2 days of AET data were available from 96.9% of patients, 3 days from 90.7%, and 4 days from 72.7%. A higher proportion of patients had a predominant pathologic pattern (31.4%) than control subjects (11.1%; P = .03). When 3 or more days of data were available, 90.4% of patients had a predominant AET pattern; when 2 days of data were available, 64.1% had a predominant AET pattern (P < .001). Day 1 AET was discordant with the predominant pattern in 22.4% of patients and was less strongly associated with the predominant pattern compared with 48 hour AET (P = .059) or total averaged AET (P = .02). Baseline symptom burden was higher in patients with a predominant pathologic pattern compared with a predominant physiologic pattern (P = .02).

CONCLUSIONS

The predominant AET pattern on prolonged wireless pH monitoring can identify patients at risk for reflux symptoms and provides gains over 24 hours and 48 hours recording, especially when results from the first 2 days are discordant or borderline.

ESNM/ANMS Review. Diagnosis and management of globus sensation: A clinical challenge

Globus is a non-painful sensation of a tightness or a lump/foreign body in the throat that is not associated with dysphagia and may actually improve during meals. While several otorhinolaryngologic, thyroid, and esophageal disorders have been linked to globus, cause-and-effect relationships are difficult to establish. Consequently, though part of the evaluation, objective otorhinolaryngologic and esophageal testing is often negative. The presence of alarm symptoms, particularly pain, weight loss, dysphagia, or odynophagia is indications for objective testing. A diagnosis of idiopathic globus requires exclusion of pharyngeal, laryngeal, and esophageal disorders with laryngoscopy, endoscopy, high-resolution manometry, barium radiography, and/or ambulatory reflux monitoring. A trial of acid-suppressive therapy may be reasonable in the absence of alarm symptoms, especially if concurrent reflux symptoms are identified. Ablation of heterotopic gastric mucosa in the proximal esophagus has been reported to improve globus symptoms. Beyond these specific approaches, further management of idiopathic globus consists of reassurance, neuromodulators, and complementary approaches. Globus has a benign course with no long-term consequences, and the overall prognosis is good as the magnitude of symptoms may decline over time.