Gastroesophageal reflux disease(GERD)poses a substantial global health challenge,with prevalence rates exhibiting geographical variation.Despite its widespread recognition,the exact prevalence and associated risk fact...Gastroesophageal reflux disease(GERD)poses a substantial global health challenge,with prevalence rates exhibiting geographical variation.Despite its widespread recognition,the exact prevalence and associated risk factors remain elusive.This article comprehensively analyzed the global burden of GERD,shedding light on its risk factors,underlying pathophysiological mechanisms,current diagnostic modalities,evolving management strategies tailored to diverse patient profiles,and complex determinants contributing to treatment failures.A deeper comprehension of GERD is achieved by dissecting these intricate facets,paving the way for enhanced clinical management and improved patient outcomes.展开更多
AIM:To evaluate the association of Helicobacter pylori(H.pylori)-related chronic gastritis stage with upper gastro-intestinal symptoms and gastro-eso-phageal reflux disease(GERD).METHODS:Subjects underwent upper gastr...AIM:To evaluate the association of Helicobacter pylori(H.pylori)-related chronic gastritis stage with upper gastro-intestinal symptoms and gastro-eso-phageal reflux disease(GERD).METHODS:Subjects underwent upper gastrointestinal endoscopy,a questionnaire using a frequency scale for symptoms of GERD(FSSG),and measurements of serum H.pylori-antibody and pepsinogen(PG)levels.They were classified into the following 4 groups in terms of H.pylori-related chronic gastritis stage:Group A(n = 219),H.pylori(-)PG(-);Group B(n = 310),H.pylori(+)PG(-);Group C(n = 279),H.pylori(+)PG(+);and Group D(n = 17),H.pylori(-)PG(+).RESULTS:Reflux esophagitis occurred in 30.6% of Group A,14.5% of Group B,6.8% of Group C,and 0% of Group D(P < 0.001).Scores for acid reflux sympto-ms decreased significantly with chro-nic gastritis stage(from Group A to D)(P < 0.05),while scores for dysmotility symptoms did no-t differ significantly.The prevalence of nonerosive reflux disease(NERD)did not differ amo-ng groups.However,in subjects with GERD,the prevalence of NERD tended to increase with chronic gastritis stage(P = 0.081).CONCLUSION:Acid reflux sympto-ms and the prevalen-ce of reflux esophagitis can be assessed by measuring both serum H.pylori-antibody and PG levels.展开更多
Gastroesophageal reflux disease is one of most common causes of chronic cough. Medical history offers few clues as to the cause of cough induced by this disease. 24-h esophageal ph monitoring is considered as the most...Gastroesophageal reflux disease is one of most common causes of chronic cough. Medical history offers few clues as to the cause of cough induced by this disease. 24-h esophageal ph monitoring is considered as the most sensitive and specific test for the diagnosis. When it is unavailable or unsuitable, upper gastrointestinal endoscopy and barium esophagography can be used as an alternative examination. Combined multichannel intraluminal impedance and pH testing is promising because of its ability to detect non-acid reflux as well as acid reflux. Empiric therapy trial is a simple and cheap way to identify suspected patients. Drug therapy is effective in most of the patients, in which proton pump inhibitors is the most powerful. Antireflux surgery is the last choice,used only when intensive drug therapy fails. The definitive diagnosis of cough due to gastroesophageal reflux disease can be established only after cough improves or cc.npletely disappears with antireflux therapy.展开更多
Heartburn is a common symptom shared by both gastroesophageal reflux disease(GERD)and functional heartburn(FHB),which can make it challenging to differentiate between the two conditions.However,examining oral manifest...Heartburn is a common symptom shared by both gastroesophageal reflux disease(GERD)and functional heartburn(FHB),which can make it challenging to differentiate between the two conditions.However,examining oral manifestations of GERD can be a cost-effective and readily available method to aid in this differentiation process.It may serve as a valuable tool in distinguishing GERD from FHB.展开更多
AIMS To establish optimal thresholds of pH variation(pH fluc- tuations and reflux episodes)in separating physiological and pathological gastroesophageal reflux(GER),and to evaluate their significance in the diagnosis ...AIMS To establish optimal thresholds of pH variation(pH fluc- tuations and reflux episodes)in separating physiological and pathological gastroesophageal reflux(GER),and to evaluate their significance in the diagnosis of GER disease. METHODS Twenty-four-hour intraesophageal pH monitoring and endoscopy were performed in 400 patients with GER symptoms and in 100 healthy controls. RESULTS The results showed that the percentages of the time with pH fluctuations in patients with and without esophagitis,and in healthy controls were,on average,12.65%,9.5% and 2. 76% in 24h,respectively,and the respective percentages of the time with reflux episodes in the same groups in 24h were,on average,3.12%,2.04% and 0.18%,respectively.Using a receiver-operating-characteristic curve analysis,<6.7% of the time with pH fluctuations and<0.1% of the time with reflux episodes were defined as the combined thresholds for physiologi- cal versus pathological reflux.The sensitivity of the combuned thresholds for the detection of GER patients with and without esophagitis was 96.7% and 90.0%,respectively,and their specificity for the diagnosis of patients with abnormal GER disease was 100%. CONCLUSIONS pH flucuations and reflux episodes,when e- valuated together,are more useful for classifying patients with GER and their combined thresholds yield higher diagnostic accura- cy in assessing patients with GER disease.展开更多
Globus is a persistent or intermittent non-painful sensation of a lump or foreign body in the throat.It is a commonly encountered clinical condition that is usually long-lasting,difficult to treat,and has a tendency t...Globus is a persistent or intermittent non-painful sensation of a lump or foreign body in the throat.It is a commonly encountered clinical condition that is usually long-lasting,difficult to treat,and has a tendency to recur.Furthermore,due to the uncertain etiology of globus,it remains difficult to establish standard investigation and treatment strategies for affected patients. As a first step for managing globus,careful history taking and nasolaryngoscopy are essential.Given the benign nature of the condition and the recent notion that gastroesophageal reflux disease is a major cause of globus,empirical therapy with a high dose of proton pump inhibitors is reasonable for patients with typical globus.If patients are nonresponsive to this therapy, definitive assessments such as endoscopy,multichannel intraluminal impedance/pH monitoring,and ma-nometry should be considered.Speech and language therapy,anti-depressants,and cognitive-behavioral therapy can be helpful in patients whose symptoms persist despite negative investigations.展开更多
BACKGROUND Heartburn is identically the key symptom of both,gastroesophageal reflux disease(GERD)and functional heartburn(FHB),making the differential diagnosis resource-intensive.Oral manifestations of GERD can be ea...BACKGROUND Heartburn is identically the key symptom of both,gastroesophageal reflux disease(GERD)and functional heartburn(FHB),making the differential diagnosis resource-intensive.Oral manifestations of GERD can be easily examined;therefore,their exploration might be a cheap,widely available,and useful tool in the differentiation of GERD and FHB.AIM To evaluate the prevalence of dental erosions(DE)and periodontal diseases(PD)in patients with heartburn and their association with GERD and FHB.METHODS A total of 116[M/F:51/65,mean age:54(17-80)years]consecutive patients with heartburn were enrolled for detailed esophageal function and orodental examinations.RESULTS Dental disorders were detected in 89%(103/116).Patients with PD+DE had significantly more often pathologic reflux(90.0%vs 27.8%;P<0.05),higher esophagitis scores(1.8 vs 0.9;P<0.05),and a significantly different mean impedance curve(P=0.04)than those without any dental diseases.The opposite approach established that patients with GERD had significantly higher prevalence of DE and PD,especially if both were present(28.9%vs 2.0%;P<0.01),more severe PD(1.5 vs 1.0;P<0.01),and longer history of heartburn(15 years vs 9 years;P<0.01)than those with FHB.CONCLUSION The dental evaluation of patients with heartburn seems to be useful in the differential diagnosis of GERD and FHB.Among the studied parameters,the co-appearance of DE and PD seems to be the best predictor of GERD,whereas the absence of dental disorders was mostly observed in FHB.展开更多
BACKGROUND Metastatic tumors of the hand are very rare.They are usually late manifestations of massive advanced malignancies.However,a small portion of acrometastases are indications of occult primary cancer.Here,we r...BACKGROUND Metastatic tumors of the hand are very rare.They are usually late manifestations of massive advanced malignancies.However,a small portion of acrometastases are indications of occult primary cancer.Here,we report an extremely rare case in which a scaphoid bone lesion was the initial manifestation and was found to be a metastasis from gastroesophageal junction(GEJ)cancer.CASE SUMMARY A 57-year-old male patient presented with ongoing left wrist pain and swelling after trauma.He was initially misdiagnosed with infection of the scaphoid bone and treated with antibiotics and anti-inflammatory drugs.Further radiographic investigations showed a scaphoid pathological fracture,indicating a metastatic tumor derived from the GEJ and/or right lung malignancies.Gastroscopy failed to identify the pathology of the mass at the GEJ,which grew in an exophytic pattern.A lung puncture biopsy was not performed because the patient refused the procedure.To relieve his wrist pain and obtain a definite pathology,we resected the scaphoid lesion.Based on the clinical and pathological results,the patient was finally diagnosed with multiple metastases of advanced GEJ adenocarcinoma.He underwent chemotherapy and died 6 mo after his initial presentation.CONCLUSION Despite the rareness of the disease,orthopedic surgeons should consider the possibility of metastasis to the bones of the hand when patients complain of persistent and progressive pain in the hand.展开更多
Introduction:Noninvasive diagnoses of clinically significant portal hypertension(CSPH)and high-risk gastroesophageal varices are clinically relevant but challenging.Four-dimensional(4D)flow magnetic resonance imaging(...Introduction:Noninvasive diagnoses of clinically significant portal hypertension(CSPH)and high-risk gastroesophageal varices are clinically relevant but challenging.Four-dimensional(4D)flow magnetic resonance imaging(MRI)provides comprehensive flow information and is a promising alternative.This study evaluated the efficacy of 4D flow MRI as a noninvasive method for diagnosing CSPH and high-risk varices in patients with liver cirrhosis.Methods:This prospective study enrolled consecutive patients diagnosed with liver cirrhosis at a tertiary referral center between October 2020 and March 2021.Each participant underwent abdominal 4D flow MRI.Hemodynamic parameters within the portal vein,including the average and peak flow velocities,normalized flow volume(Q_(normal)),and regurgitant fraction(R%),were extracted and compared between healthy individuals and patients with CSPH and between participants with high-and low-risk varices.Subsequently,these parameters were incorporated into a logistic regression(LR)model refined using L1 regularization and validated using five-fold cross-validation.The diagnostic efficacy was evaluated using receiver operating characteristic(ROC)curves.Results:Eighty-two participants were enrolled(71 patients diagnosed with liver cirrhosis and 11 healthy individuals serving as controls).Among hemodynamic parameters,patients with CSPH exhibited a notable increase in Q_(normal)of 0.66±0.19 ml*m^(2)/[cycle*kg](P=0.001)and an R%of 1.98(2.05)(P=0.002).Similarly,patients with high-risk varices showed a higher Q_(normal)of 0.61±0.15 ml*m^(2)/[cycle*kg](P<0.001)and R%of 1.88(2.81)(P=0.006).ROC analysis revealed an area under the curve(AUC)for Q_(normal)of 0.93 and 0.91 for R%for diagnosing CSPH,while the LR model showcased a superior AUC of 0.95.For high-risk varices,Q_(normal)and R%showed AUC values of 0.75 and 0.70,respectively,whereas the LR model showed a higher AUC of 0.84.Conclusion:As a noninvasive imaging modality,4D flow MRI exhibits considerable potential for the diagnosis of CSPH and high-risk gastroesophageal varices;thus,it may minimize the reliance on invasive procedures in patients with cirrhosis.展开更多
Background:Gastroesophageal reflux disease(GERD)is heterogeneous with a varied symptom spectrum and reflux profiles.Its definite diagnosis often requires invasive tools including endoscopy or reflux monitoring.The aim...Background:Gastroesophageal reflux disease(GERD)is heterogeneous with a varied symptom spectrum and reflux profiles.Its definite diagnosis often requires invasive tools including endoscopy or reflux monitoring.The aim of this study was to investigate the clinical relevance of salivary pepsin detection as a non-invasive screening tool to diagnose GERD of different subtypes.Methods:A total of 77 patients with suspected GERD symptoms and 12 asymptomatic controls were analysed.All participants performed symptom evaluation,upper endoscopy,esophageal manometry,and 24-hour multichannel intraluminal impedance-dual pH probe monitoring.Saliva was self-collected across three different time points:at early fasting,postprandially,and at symptom occurrence.Salivary pepsin levels were measured via Peptest.The optimal threshold of salivary pepsin for diagnosing distal or proximal reflux was determined according to a receiver-operating characteristic curve.Results:The average salivary pepsin concentration of suspected GERD patients was significantly higher than that of controls(100.63[68.46,141.38]vs 67.90[31.60,115.06]ng/mL,P=0.044),although no difference was found among patients with different symptom spectrums.The distal reflux group had a higher average pepsin concentration than non-reflux patients(170.54[106.31,262.76]vs 91.13[63.35,127.63]ng/mL,P=0.043),while no difference was observed between the distal reflux group and the proximal reflux group.The optimal cut-off value of salivary pepsin concentration for diagnosing pathological distal reflux was 157.10 ng/mL,which was higher than that for diagnosing pathological proximal reflux(122.65 ng/mL).The salivary pepsin concentration was significantly correlated with distal and proximal reflux parameters.Conclusions:Salivary pepsin measurement can help in identifying true GERD with pathological distal reflux or proximal reflux,regardless of different symptom spectrums.A higher threshold should be applied for diagnosing distal reflux than for proximal reflux.展开更多
文摘Gastroesophageal reflux disease(GERD)poses a substantial global health challenge,with prevalence rates exhibiting geographical variation.Despite its widespread recognition,the exact prevalence and associated risk factors remain elusive.This article comprehensively analyzed the global burden of GERD,shedding light on its risk factors,underlying pathophysiological mechanisms,current diagnostic modalities,evolving management strategies tailored to diverse patient profiles,and complex determinants contributing to treatment failures.A deeper comprehension of GERD is achieved by dissecting these intricate facets,paving the way for enhanced clinical management and improved patient outcomes.
文摘AIM:To evaluate the association of Helicobacter pylori(H.pylori)-related chronic gastritis stage with upper gastro-intestinal symptoms and gastro-eso-phageal reflux disease(GERD).METHODS:Subjects underwent upper gastrointestinal endoscopy,a questionnaire using a frequency scale for symptoms of GERD(FSSG),and measurements of serum H.pylori-antibody and pepsinogen(PG)levels.They were classified into the following 4 groups in terms of H.pylori-related chronic gastritis stage:Group A(n = 219),H.pylori(-)PG(-);Group B(n = 310),H.pylori(+)PG(-);Group C(n = 279),H.pylori(+)PG(+);and Group D(n = 17),H.pylori(-)PG(+).RESULTS:Reflux esophagitis occurred in 30.6% of Group A,14.5% of Group B,6.8% of Group C,and 0% of Group D(P < 0.001).Scores for acid reflux sympto-ms decreased significantly with chro-nic gastritis stage(from Group A to D)(P < 0.05),while scores for dysmotility symptoms did no-t differ significantly.The prevalence of nonerosive reflux disease(NERD)did not differ amo-ng groups.However,in subjects with GERD,the prevalence of NERD tended to increase with chronic gastritis stage(P = 0.081).CONCLUSION:Acid reflux sympto-ms and the prevalen-ce of reflux esophagitis can be assessed by measuring both serum H.pylori-antibody and PG levels.
文摘Gastroesophageal reflux disease is one of most common causes of chronic cough. Medical history offers few clues as to the cause of cough induced by this disease. 24-h esophageal ph monitoring is considered as the most sensitive and specific test for the diagnosis. When it is unavailable or unsuitable, upper gastrointestinal endoscopy and barium esophagography can be used as an alternative examination. Combined multichannel intraluminal impedance and pH testing is promising because of its ability to detect non-acid reflux as well as acid reflux. Empiric therapy trial is a simple and cheap way to identify suspected patients. Drug therapy is effective in most of the patients, in which proton pump inhibitors is the most powerful. Antireflux surgery is the last choice,used only when intensive drug therapy fails. The definitive diagnosis of cough due to gastroesophageal reflux disease can be established only after cough improves or cc.npletely disappears with antireflux therapy.
文摘Heartburn is a common symptom shared by both gastroesophageal reflux disease(GERD)and functional heartburn(FHB),which can make it challenging to differentiate between the two conditions.However,examining oral manifestations of GERD can be a cost-effective and readily available method to aid in this differentiation process.It may serve as a valuable tool in distinguishing GERD from FHB.
文摘AIMS To establish optimal thresholds of pH variation(pH fluc- tuations and reflux episodes)in separating physiological and pathological gastroesophageal reflux(GER),and to evaluate their significance in the diagnosis of GER disease. METHODS Twenty-four-hour intraesophageal pH monitoring and endoscopy were performed in 400 patients with GER symptoms and in 100 healthy controls. RESULTS The results showed that the percentages of the time with pH fluctuations in patients with and without esophagitis,and in healthy controls were,on average,12.65%,9.5% and 2. 76% in 24h,respectively,and the respective percentages of the time with reflux episodes in the same groups in 24h were,on average,3.12%,2.04% and 0.18%,respectively.Using a receiver-operating-characteristic curve analysis,<6.7% of the time with pH fluctuations and<0.1% of the time with reflux episodes were defined as the combined thresholds for physiologi- cal versus pathological reflux.The sensitivity of the combuned thresholds for the detection of GER patients with and without esophagitis was 96.7% and 90.0%,respectively,and their specificity for the diagnosis of patients with abnormal GER disease was 100%. CONCLUSIONS pH flucuations and reflux episodes,when e- valuated together,are more useful for classifying patients with GER and their combined thresholds yield higher diagnostic accura- cy in assessing patients with GER disease.
基金Supported by A Pusan National University Hospital Clinical Research Grant(2011)a grant from the National R and D Program for Cancer Control,Ministry for Health,Welfare and Family Affairs,Republic of Korea,No.0920050
文摘Globus is a persistent or intermittent non-painful sensation of a lump or foreign body in the throat.It is a commonly encountered clinical condition that is usually long-lasting,difficult to treat,and has a tendency to recur.Furthermore,due to the uncertain etiology of globus,it remains difficult to establish standard investigation and treatment strategies for affected patients. As a first step for managing globus,careful history taking and nasolaryngoscopy are essential.Given the benign nature of the condition and the recent notion that gastroesophageal reflux disease is a major cause of globus,empirical therapy with a high dose of proton pump inhibitors is reasonable for patients with typical globus.If patients are nonresponsive to this therapy, definitive assessments such as endoscopy,multichannel intraluminal impedance/pH monitoring,and ma-nometry should be considered.Speech and language therapy,anti-depressants,and cognitive-behavioral therapy can be helpful in patients whose symptoms persist despite negative investigations.
基金the University of Szeged Open Access Fund,No.6373.
文摘BACKGROUND Heartburn is identically the key symptom of both,gastroesophageal reflux disease(GERD)and functional heartburn(FHB),making the differential diagnosis resource-intensive.Oral manifestations of GERD can be easily examined;therefore,their exploration might be a cheap,widely available,and useful tool in the differentiation of GERD and FHB.AIM To evaluate the prevalence of dental erosions(DE)and periodontal diseases(PD)in patients with heartburn and their association with GERD and FHB.METHODS A total of 116[M/F:51/65,mean age:54(17-80)years]consecutive patients with heartburn were enrolled for detailed esophageal function and orodental examinations.RESULTS Dental disorders were detected in 89%(103/116).Patients with PD+DE had significantly more often pathologic reflux(90.0%vs 27.8%;P<0.05),higher esophagitis scores(1.8 vs 0.9;P<0.05),and a significantly different mean impedance curve(P=0.04)than those without any dental diseases.The opposite approach established that patients with GERD had significantly higher prevalence of DE and PD,especially if both were present(28.9%vs 2.0%;P<0.01),more severe PD(1.5 vs 1.0;P<0.01),and longer history of heartburn(15 years vs 9 years;P<0.01)than those with FHB.CONCLUSION The dental evaluation of patients with heartburn seems to be useful in the differential diagnosis of GERD and FHB.Among the studied parameters,the co-appearance of DE and PD seems to be the best predictor of GERD,whereas the absence of dental disorders was mostly observed in FHB.
基金Natural Science Foundation of Zhejiang Province,No.LQ19H060002 and No.LQ19H160041Medical and Health Science and Technology Project of Zhejiang Province,No.2018KY089.
文摘BACKGROUND Metastatic tumors of the hand are very rare.They are usually late manifestations of massive advanced malignancies.However,a small portion of acrometastases are indications of occult primary cancer.Here,we report an extremely rare case in which a scaphoid bone lesion was the initial manifestation and was found to be a metastasis from gastroesophageal junction(GEJ)cancer.CASE SUMMARY A 57-year-old male patient presented with ongoing left wrist pain and swelling after trauma.He was initially misdiagnosed with infection of the scaphoid bone and treated with antibiotics and anti-inflammatory drugs.Further radiographic investigations showed a scaphoid pathological fracture,indicating a metastatic tumor derived from the GEJ and/or right lung malignancies.Gastroscopy failed to identify the pathology of the mass at the GEJ,which grew in an exophytic pattern.A lung puncture biopsy was not performed because the patient refused the procedure.To relieve his wrist pain and obtain a definite pathology,we resected the scaphoid lesion.Based on the clinical and pathological results,the patient was finally diagnosed with multiple metastases of advanced GEJ adenocarcinoma.He underwent chemotherapy and died 6 mo after his initial presentation.CONCLUSION Despite the rareness of the disease,orthopedic surgeons should consider the possibility of metastasis to the bones of the hand when patients complain of persistent and progressive pain in the hand.
基金supported by the Key Research and Development Program of Jiangsu Province(BE2023767)Research Personnel Cultivation Programme of Zhongda Hospital,Southeast University(CZXMGSP-RC125)+2 种基金the Fundamental Research Fund of Southeast University(3290002303A2)Changjiang Scholars Talent Cultivation Project of Zhongda Hospital of Southeast University(2023YJXYYRCPY03)the Basic Research Fund,First Affiliated Hospital of Gannan Medical University(QD095).
文摘Introduction:Noninvasive diagnoses of clinically significant portal hypertension(CSPH)and high-risk gastroesophageal varices are clinically relevant but challenging.Four-dimensional(4D)flow magnetic resonance imaging(MRI)provides comprehensive flow information and is a promising alternative.This study evaluated the efficacy of 4D flow MRI as a noninvasive method for diagnosing CSPH and high-risk varices in patients with liver cirrhosis.Methods:This prospective study enrolled consecutive patients diagnosed with liver cirrhosis at a tertiary referral center between October 2020 and March 2021.Each participant underwent abdominal 4D flow MRI.Hemodynamic parameters within the portal vein,including the average and peak flow velocities,normalized flow volume(Q_(normal)),and regurgitant fraction(R%),were extracted and compared between healthy individuals and patients with CSPH and between participants with high-and low-risk varices.Subsequently,these parameters were incorporated into a logistic regression(LR)model refined using L1 regularization and validated using five-fold cross-validation.The diagnostic efficacy was evaluated using receiver operating characteristic(ROC)curves.Results:Eighty-two participants were enrolled(71 patients diagnosed with liver cirrhosis and 11 healthy individuals serving as controls).Among hemodynamic parameters,patients with CSPH exhibited a notable increase in Q_(normal)of 0.66±0.19 ml*m^(2)/[cycle*kg](P=0.001)and an R%of 1.98(2.05)(P=0.002).Similarly,patients with high-risk varices showed a higher Q_(normal)of 0.61±0.15 ml*m^(2)/[cycle*kg](P<0.001)and R%of 1.88(2.81)(P=0.006).ROC analysis revealed an area under the curve(AUC)for Q_(normal)of 0.93 and 0.91 for R%for diagnosing CSPH,while the LR model showcased a superior AUC of 0.95.For high-risk varices,Q_(normal)and R%showed AUC values of 0.75 and 0.70,respectively,whereas the LR model showed a higher AUC of 0.84.Conclusion:As a noninvasive imaging modality,4D flow MRI exhibits considerable potential for the diagnosis of CSPH and high-risk gastroesophageal varices;thus,it may minimize the reliance on invasive procedures in patients with cirrhosis.
基金supported by the Guangdong Natural Science Foundation[grant number 2023A1515010187]the Guangdong provincial and municipal Joint Fund[grant number 2022A1515111159]the China National Natural Science Foundation[grant numbers 82170577 and 81970479].
文摘Background:Gastroesophageal reflux disease(GERD)is heterogeneous with a varied symptom spectrum and reflux profiles.Its definite diagnosis often requires invasive tools including endoscopy or reflux monitoring.The aim of this study was to investigate the clinical relevance of salivary pepsin detection as a non-invasive screening tool to diagnose GERD of different subtypes.Methods:A total of 77 patients with suspected GERD symptoms and 12 asymptomatic controls were analysed.All participants performed symptom evaluation,upper endoscopy,esophageal manometry,and 24-hour multichannel intraluminal impedance-dual pH probe monitoring.Saliva was self-collected across three different time points:at early fasting,postprandially,and at symptom occurrence.Salivary pepsin levels were measured via Peptest.The optimal threshold of salivary pepsin for diagnosing distal or proximal reflux was determined according to a receiver-operating characteristic curve.Results:The average salivary pepsin concentration of suspected GERD patients was significantly higher than that of controls(100.63[68.46,141.38]vs 67.90[31.60,115.06]ng/mL,P=0.044),although no difference was found among patients with different symptom spectrums.The distal reflux group had a higher average pepsin concentration than non-reflux patients(170.54[106.31,262.76]vs 91.13[63.35,127.63]ng/mL,P=0.043),while no difference was observed between the distal reflux group and the proximal reflux group.The optimal cut-off value of salivary pepsin concentration for diagnosing pathological distal reflux was 157.10 ng/mL,which was higher than that for diagnosing pathological proximal reflux(122.65 ng/mL).The salivary pepsin concentration was significantly correlated with distal and proximal reflux parameters.Conclusions:Salivary pepsin measurement can help in identifying true GERD with pathological distal reflux or proximal reflux,regardless of different symptom spectrums.A higher threshold should be applied for diagnosing distal reflux than for proximal reflux.