1.Exploring Mechanism of Anti-atherosclerosis Effect of Huangqi Chifengtang Based on AMPK/PPARα Signaling Pathway and NLRP3 Inflammasome
Yuqin LIANG ; Jie LIU ; Chi ZHANG ; Pingping CHEN ; Fang LU ; Shumin LIU
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(1):131-139
ObjectiveTo explore the improving effect of Huangqi Chifengtang(HCT) on atherosclerosis(AS), and elucidate its mechanism in relation to adenosine monophosphate-activated protein kinase(AMPK)/peroxisome proliferator-activated receptor α(PPARα) signaling pathway and nucleotide-binding oligomerization domain(NOD)-like receptor thermal protein domain associated protein 3(NLRP3) inflammasome. MethodsEight C57BL/6J mice were set as the normal group, and 32 ApoE-/- mice were randomly divided into the model group, the positive drug group(atorvastatin, 5 mg·kg-1·d-1), HCT low- and high-dose groups(1.95, 3.90 g·kg-1·d-1). ApoE-/- mice were fed with high-fat and high-cholesterol feed to establish an AS mouse model. After modeling, they were orally administered corresponding dose of drugs for 28 days, while the normal and model groups received an equal volume of physiological saline via oral gavage. Hematoxylin-eosin(HE) staining was used to observe the pathological status of the aorta and liver in mice, Biochemical testing and enzyme-linked immunosorbent assay(ELISA) were used to detect the levels of total cholesterol(TC), triglycerides(TG), low-density lipoprotein cholesterol(LDL-C), alanine aminotransferase(ALT), aspartate aminotransferase(AST), C-reactive protein(CRP), interleukin(IL)-1β, IL-18 in the serum, as well as superoxide dismutase(SOD), malondialdehyde(MDA), and reduced glutathione(GSH) in the liver. Real-time fluorescence quantitative polymerase chain reaction(Real-time PCR) was used to measure the mRNA expression levels of NLRP3, apoptosis-associated speck-like protein(ASC), cysteinyl aspartate specific proteinase-1(Caspase-1), Toll-like receptor 4(TLR4) in the aorta, and fatty acid synthase(FAS), stearoyl-CoA desaturase 1(SCD1), PPARα, and carnitine palmitoyltransferase 1A(CPT1A) in the liver. Immunohistochemistry was used to determine the protein expressions of NLRP3, Caspase-1, and ASC in the aorta, and Western blot was used to measure the protein expressions of AMPK, p-AMPK, sterol regulatory element binding protein-1c(SREBP-1c), CPT1A, and FAS in the liver. ResultsCompared with the normal group, the model group showed a significant increase in lipid plaque deposition in the aorta and lipid accumulation in the liver, the levels of TC, TG, LDL-C, AST, ALT, IL-1β, IL-18 and CRP in the serum were significantly increased(P<0.01), and the mRNA and protein expressions of aortic TLR4, NLRP3, Caspase-1 and ASC were significantly upregulated(P<0.01). The levels of SOD and GSH in the liver were significantly reduced, while the level of MDA was significantly increased(P<0.01). The mRNA expressions of FAS and SCD1 in the liver were significantly downregulated, while the mRNA expressions of PPARα and CPT1A were significantly upregulated. The protein expressions of p-AMPK/AMPK and CPT1A in the liver were significantly reduced, while the expressions of SREBP-1c and FAS proteins were significantly increased(P<0.01). Compared with the model group, the low- and high-dose HCT groups showed significant improvements in aortic plaques and hepatic lipid deposition. The levels of TC, LDL-C, AST, IL-1β and IL-18 in the serum of the low-dose HCT group, as well as TC, TG, LDL-C, AST, ALT, IL-1β, IL-18 and CRP in the serum of the high-dose HCT group, were significantly reduced(P<0.01). The mRNA expressions of TLR4, NLRP3 and Caspase-1 in the aorta of the low-dose HCT group, as well as TLR4, NLRP3, Caspase-1 and ASC in the aorta of the high-dose HCT group, were significantly downregulated(P<0.01). The protein expressions of Caspase-1 and ASC in the aorta of the low-dose HCT group, as well as NLRP3, Caspase-1 and ASC in the high-dose HCT group, were significantly downregulated(P<0.01). The levels of SOD and GSH in the liver of the low- and high-dose HCT groups were significantly increased, while the level of MDA in the high-dose HCT group was significantly decreased(P<0.05, P<0.01). In the HCT-treated group, the mRNA expressions of FAS and SCD1 in the liver were significantly upregulated, while the mRNA expressions of PPARα and CPT1A were significantly downregulated, the protein expressions of p-AMPK/AMPK and CPT1A in the liver were significantly increased, while the protein expressions of SREBP-1c and FAS were significantly decreased(P<0.05, P<0.01). ConclusionHCT can improve lipid metabolism by activating the AMPK/PPARα pathway and inhibit NLRP3 inflammasome-mediated inflammatory responses, thereby reducing hepatic lipid deposition and AS plaque formation.
2.Effect of Jianpi Qinghua Granules on Blood Glucose Fluctuations and Skeletal Muscle Mass and Function in Newly Diagnosed Overweight/Obese Type 2 Diabetes Patients with Qi-Yin Deficiency Syndrome
Yuan CHEN ; Qiuyue GUO ; Yanyan XIAO ; Hao LU ; Chi CHEN ; Junfei XU
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(11):218-224
ObjectiveTo investigate the effects of Jianpi Qinghua granules on blood glucose fluctuations in patients with newly diagnosed overweight/obese type 2 diabetes mellitus (T2DM) and Qi-Yin deficiency syndrome from the perspective of skeletal muscle mass and function, while providing new insights for the treatment of diabetes. MethodsThis study employed a randomized, double-blind, placebo-controlled design. A total of 110 newly diagnosed overweight/obese T2DM patients meeting the inclusion criteria were randomly assigned to either the traditional Chinese medicine (TCM) group (54 cases) or the control group (56 cases). Patients in the TCM group received Jianpi Qinghua Granules, while those in the control group received a placebo. Both groups underwent dietary and exercise guidance. After 12 weeks of intervention, blood glucose fluctuations were assessed using the following parameters: time in the target blood glucose range (TIR), mean daily blood glucose (MBG), standard deviation of mean daily blood glucose (SDBG), mean amplitude of glycemic excursions (MAGE), coefficient of variation of blood glucose (CV), glycated hemoglobin (HbA1c) achievement rate, fasting plasma glucose (FPG), and 2 hour postprandial glucose (2 hPG). Skeletal muscle mass was measured by dual-energy X-ray absorptiometry (DXA), while skeletal muscle function was evaluated using a handheld dynamometer for distal muscle strength and a 5-time sit-to-stand test for lower limb function. Additionally, pancreatic islet function and TCM syndrome scores were analyzed. ResultsNo significant differences were observed in baseline data between the two groups before intervention, ensuring comparability. After treatment, compared to the control group, the TCM group showed a significant increase in TIR (P<0.01). While the SDBG and CV decreased, and MBG and MAGE increased in the TCM group, these differences were not statistically significant. Notably, the TCM group exhibited significant reductions in 2 hPG (P<0.01) and HbA1c (P<0.05), though the decrease in FPG was not statistically significant. The HbA1c achievement rate in the TCM group was significantly higher than that in the control group (χ2=45.498, P<0.01). In terms of skeletal muscle mass and function, the TCM group demonstrated a significant increase in handgrip strength (P<0.01) and a significant reduction in the 5-time sit-to-stand duration (P<0.05). However, although body fat percentage increased, leading to a decrease in skeletal muscle mass and the ratio of skeletal muscle to fat, these changes were not statistically significant. For pancreatic islet function, the TCM group showed significant reductions in fasting insulin (FINS) and homeostasis model assessment of insulin resistance (HOMA-IR) (P<0.01). Additionally, the TCM syndrome score in the TCM group was significantly reduced (P<0.01). ConclusionJianpi Qinghua granules may reduce blood glucose fluctuations in newly diagnosed overweight/obese T2DM patients with Qi-Yin deficiency syndrome by enhancing skeletal muscle function, improving pancreatic islet function, and ameliorating related TCM syndromes.
3.Molecular Characterization Network of Dampness-heat Syndrome in Patients with Chronic Hepatitis B Complicated by Glucose Metabolism Disorder Based on Shadowless Scleral Imaging and Metabolomics Technology
Caiying HE ; Hang ZHOU ; Yanqi CHI ; Baixue LI ; Liang HUANG ; Zhu CHEN ; Dafeng LIU ; Dong WANG
Chinese Journal of Experimental Traditional Medical Formulae 2026;32(14):271-285
ObjectiveThis paper aims to conduct the feature analysis and correlation analysis on the ocular collateral features and differential metabolites in patients with chronic hepatitis B (CHB) complicated by glucose metabolism disorder (GMD),particularly those with the damp-heat syndrome type,by integrating shadowless scleral imaging and metabolomics technologies. MethodsA total of 313 patients were recruited from the Hepatology and Endocrinology Outpatient Departments of Public Health Clinical Center of Chengdu according to the inclusion/exclusion criteria,and they were divided into a CHB group and a CHB complicated by GMD groups (damp-heat syndrome group and non-damp-heat syndrome group). All patients underwent high-definition ocular image acquisition and feature extraction using an intelligent analysis system for shadowless scleral imaging to analyze the differences in the counting of morphological feature scores of ocular collaterals among groups. By using a digital sampling method,24 patients from each group were randomly selected,along with 20 healthy volunteers,for untargeted metabolomic analysis of peripheral serum. Differential metabolites were identified,statistically analyzed,and subjected to potential biomarker analysis and pathway enrichment. Spearman method was performed to conduct the correlation analysis on the differential ocular collateral features and differential metabolites,followed by correlation network construction. ResultsCompared with those in the CHB group,patients with CHB complicated by GMD showed significant changes in ocular collateral feature scores such as "hillock","blood vessels",and "pale dusky coloration" (P<0.05). In comparison with those in the healthy group,metabolites including N-acetylglucosamine,acetylhomoserine,and myo-inositol (AUC>0.7) were identified as potential biomarkers for the disease. Compared with those in the CHB complicated by GMD group with non-damp-heat syndrome,patients with damp-heat syndrome exhibited significant changes in feature scores of "plaques","yellow coloration","spleen",and "gallbladder" (P<0.05). In comparison with those in the healthy group,metabolites such as O2′-4a-cyclic tetrahydrobiopterin,theobromine,xanthurenic acid,and L-glutamic acid 5-phosphate (AUC>0.7) were identified as potential biomarkers for the damp-heat syndrome type. The Spearman correlation analysis reveals weak to moderate linear correlations between the differential scleral collateral features and metabolites. By constructing a "disease-syndrome" network of ocular diagnosis and metabolites,"xanthurenic acid-gallbladder" and "theobromine-plaque/yellow coloration" were identified as specific molecular-phenotypic correlated biomarker clusters for CHB complicated by GMD with dampness-heat syndrome. ConclusionPatients with CHB complicated by GMD demonstrate differential ocular diagnostic features and serum metabolites corresponding to disease states and dampness-heat syndrome. These objective biomarkers can guide both clinical syndrome differentiation and medication. The macro-micro integration based on ocular feature clusters and potential metabolic biomarkers offers an innovative approach to a combined traditional Chinese and Western medicine diagnosis and treatment model for this disease.
4.Harnessing Machine Learning for Personalized Care of Patients With Idiopathic Sudden Sensorineural Hearing Loss: A Multicenter Cohort Study
Yen-Ting GUO ; Ching-Ting TAN ; Chen-Chi WU ; Chun-Ying WANG ; Chein-Yu HUANG ; Tzu-Hsiang YANG ; Ting-Yi LEE ; Ting-Hua YANG ; Tien-Chen LIU ; Pey-Yu CHEN ; Pei-Hsuan LIN
Clinical and Experimental Otorhinolaryngology 2026;19(2):194-204
Objectives:
. Idiopathic sudden sensorineural hearing loss (ISSNHL) is a significant cause of hearing loss. Intratympanic steroid injection (ITSI) is commonly used as an initial or salvage treatment; however, the lack of a standardized treatment protocol has resulted in variability in clinical practice. In addition, no efficient prediction model currently exists to support personalized management. Therefore, this study aimed to develop tailored management strategies for ISSNHL using a machine-learning model.
Methods:
. This retrospective multicenter cohort study was conducted between January 2015 and December 2020, with data analysis performed between January 2021 and March 2024. Patients were selected based on the International Classification of Diseases, 10th Revision criteria for ISSNHL, along with relevant medication and procedure codes. Patients with pure-tone audiogram results not meeting ISSNHL criteria, better initial hearing in the affected ear, an identifiable etiology, no post-treatment audiogram, or delayed treatment (>6 weeks) were excluded. We included 770 patients diagnosed with ISSNHL who received ITSI. The primary outcome was the area under the receiver operating characteristic curve for prediction performance. Recovery status was determined using the last pure-tone audiogram. Modeling was conducted on the Quanta for Medical Care AI platform using five machine-learning algorithms and a nested cross-validation framework, in which feature selection and hyperparameter tuning were performed in the inner folds and model performance was evaluated in the outer folds.
Results:
. A random forest classifier outperformed the other models in predicting hearing outcomes, achieving an area under the receiver operating characteristic curve of 0.788. Time to ITSI was the most influential treatment-related factor, with ITSI administered within 10 days of hearing loss being associated with better outcomes. This model can be used to provide personalized prognostic estimates under different treatment protocols.
Conclusion
. The machine-learning-based prediction model facilitates personalized treatment strategies and timely treatment adjustments for ISSNHL, thereby optimizing the likelihood of complete recovery.
5.A stepwise cannulation strategy for conservative endoscopists: the clinical impact of transpancreatic precut after pancreatic stenting in a retrospective study from Taiwan
Wei-Chih SU ; Chia-Chi WANG ; Tsung-Hsien HSIAO ; Hung-Da CHEN ; Tzu-Hsiang KUNG ; Chih-Hsiang CHEN ; Jiann-Hwa CHEN
Clinical Endoscopy 2026;59(1):132-141
Background/Aims:
Pancreatic stenting reduces post-endoscopic retrograde cholangiopancreatography pancreatitis (PEP) and aids in cannulation in difficult cases. However, conservative endoscopists may stop at this step, resulting in suboptimal outcomes. This study assessed the efficacy of transpancreatic precut sphincterotomy (TPS) as a rescue procedure following pancreatic stenting.
Methods:
Between March 2013 and November 2018, 82 patients underwent pancreatic stenting at our institution prior to successful biliary cannulation. TPS was introduced in April 2016, and patients were divided into Before TPS and After TPS groups. The outcomes included cannulation success, PEP incidence, and predictors of TPS conversion.
Results:
There were 43 and 39 patients in the Before TPS and After TPS groups, respectively. Twenty-two patients (56.4%) underwent conversion to TPS in the After TPS group. The After TPS group had a higher bile duct cannulation rate (89.7% vs. 72.1%) than the Before TPS group, but this difference was not statistically significant (p=0.054). Multivariate analysis showed that age >50 years (odds ratio [OR], 0.181; p=0.021) and being in the After TPS group (OR, 0.712; p=0.039) were independently associated with reduced PEP risk. Haraldsson Type 2 and Type 4 papillae carried a relatively high TPS conversion rate.
Conclusions
A stepwise cannulation strategy that incorporates TPS after pancreatic stenting minimizes the need for advanced techniques and improves PEP outcomes.
6.Short-term and long-term outcomes of acute severe ulcerative colitis in Taiwan: a multicenter study with pre- and post-biologics comparison
Wei-Chen LIN ; Chun-Chi LIN ; Wen-Hung HSU ; Feng-Fan CHIANG ; Chen-Wang CHANG ; Tzu-Chi HSU ; Deng-Chyang WU ; Horng-Yuan WANG ; Jau-Min WONG ; Shu-Chen WEI
Intestinal Research 2026;24(1):117-128
Background/Aims:
Data from Asia regarding the short-term and long-term outcomes for acute severe ulcerative colitis (ASUC) are limited. We assessed the outcomes of ASUC, identified the risk factors for colectomy, and compared colectomy rates between the pre-biologics and post-biologics eras in Taiwan.
Methods:
The patients with an ASUC diagnosis between January 2013 and March 2022 at 5 tertiary medical centers were retrospectively analyzed.
Results:
In total, 98 patients were enrolled, with 68.4% diagnosed in the post-biologics era. In 78.6% of the ASUC patients initially received intravenous steroid therapy, for which the success rate was 74.1%. As for rescue therapy, 15 patients (93.8%) received biologics and 1 (6.3%) received cyclosporin. Biologics rescue therapy had a 93.3% success rate. One (1%) mortality due to septic shock occurred. The colectomy rate for index ASUC admission was 11.2%. Patients receiving colectomy were predominantly male (P= 0.012) and at older age (P= 0.016). Higher C-reactive protein (P= 0.035), lower albumin (P= 0.017), and hemoglobin (P= 0.023) levels were associated with colectomy risk. During a median follow-up of 24 months, 13 patients (15.1%) had recurrent ASUC and 23.1% of patients received colectomy. The accumulated colectomy rate at 3 years did not differ between the pre- and post-biologics eras (16.1% vs. 13.4%, P= 0.270).
Conclusions
This is the first Asian study on ASUC to compare colectomy rates between the prebiologics and post-biologics eras, revealing no significant difference. The recurrent ASUC had a higher colectomy rate than the index ASUC.
7.Influence of atrial septal defect on mitral valve growth after repair of coarctation of the aorta or an interrupted aortic arch in infants
Yi-Chia WANG ; Heng-Wen CHOU ; Chi-Hsiang HUANG ; Hsing-Hao HUANG ; Yih-Sharng CHEN ; En-Ting WU ; Shyh-Jye CHEN ; Ming-Tai LIN ; Shuenn-Nan CHIU ; Shu-Chien HUANG
Clinical and Experimental Pediatrics 2026;69(4):322-329
Background:
Patients with coarctation of the aorta (CoA) and an interrupted aortic arch (IAA) may present with small mitral valves (MVs) and a reduced left ventricular (LV) volume. Biventricular repair (BVR) in these patients is dependent on adequate size of the left cardiac structures.Purpose: This study evaluated the impact of the hemodynamic characteristics of atrial septal defects (ASDs) on MV growth following surgical repair.
Methods:
We retrospectively reviewed the data of patients diagnosed with CoA or IAA between 2007 and 2024. The z score for MV size measured 6 months postoperatively (Z2) was compared with the preoperative MV size (Z1). The factors associated with MV growth were also studied.
Results:
A total of 161 patients with CoA or IAA were included. Transthoracic echocardiography was used to assess the MV and LV dimensions preoperatively and 6 months postoperatively. Of the cohort, 155 (96.3%) underwent initial BVR and 6 underwent single-ventricle palliation. MV z scores significantly increased following BVR (mean change: +0.45±1.35; P<0.001) but decreased after single-ventricle repair (-0.56±0.49, P=0.04). Multivariate analysis identified the initial MV z score and ASD pressure gradient as independent predictors of MV growth (R2=0.39).
Conclusion
Annular growth of the MV was not observed in patients who underwent single-ventricle palliation. In contrast, among patients who achieved BVR, those with a small preoperative MV annulus and low ASD pressure gradient demonstrated subsequent catch-up MV growth, suggesting that adequate left-sided preload is essential for MV development.
8.Application of 3D-printing patient-specific instruments combined with customized locking plate in opening wedge high tibial osteotomy
Chi MA ; Ning WANG ; Yong CHEN ; Zhihan WEI ; Fengji LIU ; Chengzhe PIAO
Chinese Journal of Tissue Engineering Research 2025;29(9):1863-1869
BACKGROUND:The use of 3D-printed patient-specific instruments in opening wedge high tibial osteotomy has advantages such as shorter operative time,fewer fluoroscopic exposures,and higher correction accuracy.However,previous studies have reported issues such as significant damage to surrounding soft tissues and improper fixation of the plates. OBJECTIVE:To investigate the clinical efficacy of using 3D-printed patient-specific instruments combined with customized locking plate in opening wedge high tibial osteotomy for the treatment of knee osteoarthritis. METHODS:A total of 20 patients diagnosed with knee osteoarthritis were divided into the 3D group(n=10)and the conventional group(n=10)according to surgical methods.The 3D group underwent opening wedge high tibial osteotomy using 3D-printed patient-specific instruments combined with customized locking plate,while the conventional group underwent opening wedge high tibial osteotomy using conventional methods.The operative time,fluoroscopic exposures,incision length,pre-and postoperative hip-knee-ankle angle,medial proximal tibial angle,posterior tibial slope,the difference between the planned and actual correction angle,preoperative and 1,3,6 months postoperative knee range of motion and Lysholm score,and incidence of complications were analyzed and compared between the two groups. RESULTS AND CONCLUSION:(1)The operative time and fluoroscopic exposures were significantly shorter in the 3D group compared to the conventional group,with a statistically significant difference(P<0.001).(2)Both groups showed a significant improvement in postoperative hip-knee-ankle angle and medial proximal tibial angle compared to preoperative values,with a statistically significant difference(P<0.001),while there was no significant change in posterior tibial slope.In the 3D group,the postoperative hip-knee-ankle angle,medial proximal tibial angle,and posterior tibial slope differed from their respective preoperative planned values by(-0.22±0.72)°,(-0.20±0.73)°,and(0.23±0.37)°,but the differences were not statistically significant.The difference between the planned and actual correction angle of 3D group was significantly smaller than that of conventional group(P<0.05).(3)Both groups showed a gradual increase in knee range of motion and Lysholm scores after surgery(P<0.001).Compared to the conventional group,the 3D group had superior knee range of motion at 1 and 3 months postoperatively,as well as a higher Lysholm score at 1 month postoperatively,with statistically significant differences(P<0.05).There were no statistically significant differences in Lysholm score at 3 months and knee range of motion and Lysholm score at 6 months between the two groups(P>0.05).(4)Complications occurred in neither groups.(5)The above results indicate that both 3D-printed patient-specific instruments combined with customized locking plate and conventional methods have good clinical efficacy.However,the former has a shorter operative time,fewer fluoroscopic exposures,and faster postoperative recovery of knee joint function.Additionally,3D-printed patient-specific instruments can achieve preoperative planning accurately.
9.Effect of Anti-reflux Mucosal Ablation on Esophageal Motility in Patients With Gastroesophageal Reflux Disease: A Study Based on High-resolution Impedance Manometry
Chien-Chuan CHEN ; Chu-Kuang CHOU ; Ming-Ching YUAN ; Kun-Feng TSAI ; Jia-Feng WU ; Wei-Chi LIAO ; Han-Mo CHIU ; Hsiu-Po WANG ; Ming-Shiang WU ; Ping-Huei TSENG
Journal of Neurogastroenterology and Motility 2025;31(1):75-85
Background/Aims:
Anti-reflux mucosal ablation (ARMA) is a promising endoscopic intervention for proton pump inhibitor (PPI)-dependent gastroesophageal reflux disease (GERD). However, the effect of ARMA on esophageal motility remains unclear.
Methods:
Twenty patients with PPI-dependent GERD receiving ARMA were prospectively enrolled. Comprehensive self-report symptom questionnaires, endoscopy, 24-hour impedance-pH monitoring, and high-resolution impedance manometry were performed and analyzed before and 3 months after ARMA.
Results:
All ARMA procedures were performed successfully. Symptom scores, including GerdQ (11.16 ± 2.67 to 9.11 ± 2.64, P = 0.026) and reflux symptom index (11.63 ± 5.62 to 6.11 ± 3.86, P = 0.001), improved significantly, while 13 patients (65%) reported discontinuation of PPI. Total acid exposure time (5.84 ± 4.63% to 2.83 ± 3.41%, P = 0.024) and number of reflux episodes (73.05 ± 19.34 to 37.55 ± 22.71, P < 0.001) decreased significantly after ARMA. Improved esophagogastric junction (EGJ) barrier function, including increased lower esophageal sphincter resting pressure (13.89 ± 10.78 mmHg to 21.68 ± 11.5 mmHg, P = 0.034), 4-second integrated relaxation pressure (5.75 ± 6.42 mmHg to 9.99 ± 5.89 mmHg, P = 0.020), and EGJ-contractile integral(16.42 ± 16.93 mmHg · cm to 31.95 ± 21.25 mmHg · cm, P = 0.016), were observed. Esophageal body contractility also increased significantly (distal contractile integral, 966.85 ± 845.84 mmHg · s · cm to 1198.8 ± 811.74 mmHg · s · cm, P = 0.023). Patients with symptom improvement had better pre-AMRA esophageal body contractility.
Conclusions
ARMA effectively improves symptoms and reflux burden, EGJ barrier function, and esophageal body contractility in patients with PPIdependent GERD during short-term evaluation. Longer follow-up to clarify the sustainability of ARMA is needed.
10.Baseline Impedance via Manometry Predicts Pathological Mean Nocturnal Baseline Impedance in Isolated Laryngopharyngeal Reflux Symptoms
Yen-Ching WANG ; Chen-Chi WANG ; Chun-Yi CHUANG ; Yung-An TSOU ; Yen-Chun PENG ; Chi-Sen CHANG ; Han-Chung LIEN
Journal of Neurogastroenterology and Motility 2025;31(1):63-74
Background/Aims:
Distal mean nocturnal baseline impedance (MNBI) measuring via pH-impedance may be valuable in diagnosing patients with suspected laryngopharyngeal reflux (LPR). However, its wide adoption is hindered by cost and invasiveness. This study investigates whether baseline impedance measured during high-resolution impedance manometry (HRIM-BI) can predict pathological MNBI.
Methods:
A cross-sectional study in Taiwan included 74 subjects suspected of LPR, who underwent HRIM (MMS) and pH-impedance testing (Diversatek), after stopping proton pump inhibitors for more than 7 days. Subjects with grade C or D esophagitis or Barrett’s esophagus were excluded. The cohort was divided into 2 groups: those with concomitant typical reflux symptoms (CTRS, n = 28) and those with isolated LPR symptoms (ILPRS, n = 46). HRIM-BI measurements focused on both distal and proximal esophagi. Pathological MNBI was identified as values below 2065 Ω, measured 3 cm above the lower esophageal sphincter.
Results:
In all subjects, distal HRIM-BI values correlated weakly with distal MNBI(r = 0.34-0.39, P < 0.005). However, in patients with ILPRS, distal HRIM-BI corelated moderately with distal MNBI(r = 0.43-0.48, P < 0.005). The areas under the receiver operating characteristic curve was 0.78 (P = 0.001) with a sensitivity of 0.83 and a specificity of 0.68. No correlation exists between distal HRIM-BI and distal MNBI in patients with CTRS, and between proximal HRIM-BI and proximal MNBI in both groups.
Conclusions
Distal HRIM-BI from HRIM may potentially predict pathological MNBI in patients with ILPRS, but not in those with CTRS. Future outcome studies linked to the metric are warranted.

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