Diagnosis and management of lymphoceles after renal transplantation

Eight lymphoceles were encountered in 232 renal transplant procedures. The patients presented with either a palpable pelvic mass, ipsilateral leg pain and edema, or deteriorating renal function. Two patients were asymptomatic. The diagnosis is readily established by a combination of intravenous urography, ultrasound, and aspiration although ultrasound is the most useful method for the diagnosis and follow-up of these lesions. A functioning arteriovenous shunt in the leg on the side of the transplant may predispose to lymphocele formation. Most lymphoceles may be managed conservatively initially. However, if surgery is required, open drainage and packing would appear to be the most reliable procedure.

Prospective trial evaluating sonography after thoracic surgery in postoperative care and decision making

OBJECTIVE

Following thoracic surgery, daily chest X-rays (CXRs) are performed to assess patient evolution and to make decisions regarding chest tube removal and patient discharge. Sonography after thoracic surgery (SATS) has the potential to be an effective, convenient, inexpensive and easy to learn tool in the post-operative management of thoracic surgery patients. We hypothesized that SATS could alleviate the need for repetitive CXRs, thus reducing the related risks, costs and inconvenience.

METHODS

This study consisted of a prospective cohort trial. All patients scheduled to undergo thoracic surgery at a single academic medical centre were eligible. Post-operative bedside pleural ultrasound was performed whenever a CXR was ordered by the treating team. Investigators specifically assessed patients with the goals of identifying pleural effusions and pneumothoraces. Study investigators were blinded to CXR results. SATS findings were compared with CXRs, which were considered the gold standard in routine post-operative pleural space evaluation.

RESULTS

One hundred and twenty patients were prospectively enrolled over a 5.5-month period. Three hundred and fifty-two ultrasound examinations were performed (mean = 3.0 ± 2.4 exams per patient). The time interval between the ultrasound and the comparative CXR was 166 ± 149 min. The mean time required to perform SATS was 11 ± 6 min per exam. In the detection of pleural effusion, SATS yielded a sensitivity of 83.1% and a specificity of 59.3%. In the detection of pneumothoraces, a sensitivity of 21.2% and a specificity of 94.7% were obtained.

CONCLUSIONS

Post-operative ultrasound may alleviate the need to perform routine CXR in patients with a previously ruled out pneumothorax. SATS used selectively may be able to reduce the number of routine CXRs performed; however, it does not have high enough accuracy to replace CXRs.

Enhanced recovery after video-assisted thoracoscopic surgery lobectomy: a prospective, historically controlled, propensity-matched clinical study

Background

Enhanced recovery pathways or fast-tracking following surgery can decrease the rate of postoperative complications and hospital length of stay. The objectives of this study were to implement an enhanced recovery after surgery (ERAS) pathway for patients undergoing a video-assisted thoracoscopic surgery (VATS) lobectomy, to assess the safety and efficiency of this protocol by measuring associated postoperative outcomes, and to compare the outcomes for patients in the ERAS group with the outcomes for patients in a propensity-matched control group.

Methods

The study was a prospective clinical trial. Patients who were scheduled to undergo VATS lobectomy at the Centre hospitalier de l'Université de Montréal in Montréal, Quebec, Canada, were enrolled between November 2015 and October 2016. The ERAS pathway was used for all enrolled patients. The primary outcome was the number and severity of complications measured by the Comprehensive Complication Index. Secondary outcomes included length of stay, readmission and recovery. Recovery of patients was measured using EQ-5D-5L preoperatively and at 1 week, 1 month and 4 months after surgery. Prospectively enrolled patients were propensity matched to historical controls.

Results

Ninety-eight patients (36 men and 62 women) in the ERAS group and 98 patients in the control group (29 men and 69 women) were included in the analysis. The mean age was 65.2 ± 9.3 years, the mean body mass index (BMI) was 26.9 ± 5.9 kg/m2 and the median Charlson Comorbidity Index score was 2 (interquartile range [IQR] 2-3) in the ERAS group. In the control group, the mean age was 66.2 ± 9.4 years, the mean BMI was 27.4 ± 5.6 kg/m2 and the median Charlson Comorbidity Index score was 3 (IQR 2-3). A total of 23 patients (23.4%) in the ERAS group and 28 (28.6%) in the control group experienced 1 or more postoperative complications. The mean Comprehensive Complication Index score was 7.4 ± 16.8 in the ERAS group compared with 8.0 ± 14.3 in the control group (p = 0.79). The median postoperative length of stay was 3 days in the ERAS group and 5 days in the control group (p < 0.001). Five patients in the ERAS group and 4 patients in the control group were readmitted. The protocol adherence rate was 64.3%.

Conclusion

It is feasible to implement an enhanced recovery protocol after VATS lobectomy. Although the pathway is still early in its development in Canada, implementation of an ERAS pathway after VATS lobectomy was associated with decreased length of stay, with no observable increase in complication or readmission rates.

Fetal kidney size related to gestational age

Fetal renal anatomy was assessed in 660 apparently normal fetuses. The problems of technique of visualization of the kidneys are outlined. A correlation of fetal kidney length and gestational age is presented. The results are presented to be used as an adjunct in establishing fetal gestational age, as well as the assessment of normal renal morphology in routine obstetric ultrasound assessment.

Prospective, multicenter, international phase 2 trial evaluating ultrasonic energy for pulmonary artery branch sealing in video-assisted thoracoscopic surgery lobectomy

OBJECTIVES

The study objectives were to evaluate the immediate, short-, and medium-term efficacy and safety of pulmonary artery branch sealing using an ultrasonic vessel-sealing device in minimally invasive anatomic lung resection.

METHODS

This study consists of a prospective, phase 2, multicenter, international clinical trial (clinicaltrials.gov: NCT02719717) that enrolled patients planned for video-assisted thoracoscopic surgery/robotic anatomic lung resection in 7 centers (United States, Canada, United Kingdom). Pulmonary artery branches of 7 mm or less were sealed and divided with an ultrasonic energy vessel-sealing device. The remainder of the lobectomy was performed according to surgeon preference. Intraoperative, in-hospital, and 30-day postoperative bleeding and complications were prospectively recorded.

RESULTS

A total of 150 patients with a minimum of 1 pulmonary artery branch sealed with an ultrasonic vessel-sealing device were prospectively enrolled in the trial. Resections included 139 lobectomies and 11 segmentectomies. A total of 424 pulmonary artery branches were divided: 239 with the ultrasonic vessel-sealing device, 181 with endostaplers, and 4 with endoscopic clips. The mean and median pulmonary artery diameters were 4.7 mm/5.0 mm, 10.3 mm/10.0 mm, and 6.5 mm/6.5 mm for each method, respectively. Three of the pulmonary artery branches divided with the ultrasonic vessel-sealing device (1.3%) and 4 pulmonary artery branches divided with endostaplers (2.2%) bled intraoperatively. Among the patients with seal failures, 1 patient required conversion to thoracotomy. There was no postoperative bleeding from divided pulmonary artery branches with either sealing method. There was no mortality at 30 days.

CONCLUSIONS

Pulmonary artery branch sealing with ultrasonic energy during video-assisted thoracoscopic surgery lobectomy is safe for vessels 7 mm or less. The use of an ultrasonic device is a reasonable sealing method for pulmonary artery branches 7 mm or less.

Phase 1 Trial Evaluating Safety of Pulmonary Artery Sealing With Ultrasonic Energy in VATS Lobectomy

BACKGROUND

Energy-sealing devices may be useful to divide small pulmonary arteries (PAs) during video-assisted thoracoscopic surgery (VATS) lobectomy. We evaluated the safety of PA branch sealing with an ultrasonic energy vessel-sealing device during VATS lobectomy.

METHODS

The study consisted of a phase 1 trial. Patients planned to undergo VATS lobectomy were prospectively enrolled. Target sample size was 20 patients. Branches of 7 mm or less were sealed and cut with an ultrasonic energy vessel-sealing device. The remainder of the lobectomy was performed in a standard fashion. Intraoperative, in-hospital, and 30-day postoperative bleeding were prospectively recorded.

RESULTS

Thirty-three patients were prospectively enrolled. Thirteen patients were not amenable to PA sealing with the vessel-sealing device because all PA branch diameters exceeded 7 mm (n = 10), conversion to thoracotomy (n = 2), and lobectomy not performed (n = 1). A minimum of one PA branch was sealed with the device in 20 patients. Fifty-eight PA branches were divided in 20 patients: 31 with ultrasonic device, 24 with endostaplers, 2 with clips, and 1 with sutures. The mean vessel diameter sealed with the device was 4 mm. Two patients were converted to thoracotomy (1 with PA injury during dissection, 1 with PA tumor invasion). No intraoperative or postoperative bleeding was related to ultrasonic PA branch sealing. No postoperative deaths occurred.

CONCLUSIONS

PA branch sealing for vessels 7 mm or less was safely achieved using an ultrasonic energy vessel-sealing device in VATS lobectomy. Large-scale, prospective, multi-institutional studies are necessary before widespread clinical application of energy for PA branch sealing in VATS lobectomy.

Splenic abscess: a review with the value of ultrasound

Five cases of splenic abscess are presented. A positive ultrasound diagnosis was made in each patient, showing a regular or ill-defined anechoic mass with large or small, high-intensity echogenic foci due to contained debris. Computed tomography performed in two cases showed intrasplenic low-density areas essentially unchanged following intravenous contrast administration. Gas was present in one of the abscesses. The clinical implications in a septicaemic patient with intrasplenic gas formation following splenic embolisation are discussed.

Transtracheal thoracic natural orifice transluminal endoscopic surgery (NOTES) in a swine model

BACKGROUND

Natural orifice transluminal endoscopic surgery (NOTES) has the potential to be the final frontier in minimally invasive procedures in thoracic surgery. In order for thoracic pleural NOTES to 1 day be ready for clinical trials, each step of the procedure must be independently evaluated for both safety and efficacy. The aim of this study was to evaluate the trachea as a portal of entry for thoracic NOTES.

METHODS

Eight 40-kg swine underwent right thoracic pleuroscopy in a survival model. In order to avoid inadvertent injury to the superior vena cava, endobronchial ultrasound was employed to select the location of airway incision. A 7-mm linear incision was then performed at the chosen location using an endoscopic electrocautery needle knife through a therapeutic flexible videobronchoscope. The mediastinal fat and parietal pleura were then dissected with electrocautery, and complete right pleuroscopy was performed. The tracheal and mediastinal portal of entry were then sealed with 1-2 cc of fibrin sealant. The pigs were kept alive for 21 days postoperatively. Postmortem diagnostic bronchoscopy was performed to assess tracheal healing. All tracheal specimens underwent histologic examination for healing and signs of mediastinal infection.

RESULTS

Thoracic NOTES procedures on all eight pigs were successful. There were no intraoperative complications except for one minor bleeding episode within the mediastinal dissection site which stopped spontaneously. Two pigs died from severe laryngospasm in the early postoperative period. Six pigs survived for 21 days post-procedure and experienced uneventful postoperative courses. Postmortem examination demonstrated complete tracheal healing with appropriate scarring in all pigs.

CONCLUSIONS

The trachea appears to be a safe port of entry for thoracic NOTES procedures in a swine model. Smaller tracheal incisions followed by balloon dilatation are associated with less postoperative morbidity and mortality. Tracheal incisions sealed with fibrin sealant healed rapidly and without signs of mediastinal infection. This procedure represents a work in progress and is not yet ready for human trials.

A method of visualizing and documenting pancreatic lesions by diagnostic ultrasound

A reliable method of visualizing and documenting pancreatic lesions by ultrasound is described. This method is valuable for the follow-up of varying types of pathology, and it may be applied to a wider range of lesions than pancreatic. It is simple and saves time and money for the ultrasonographer and is more easily interpreted by the clinician.

Subsecond lung cancer detection within a heterogeneous background of normal and benign tissue using single-point Raman spectroscopy

Significance

Lung cancer is the most frequently diagnosed cancer overall and the deadliest cancer in North America. Early diagnosis through current bronchoscopy techniques is limited by poor diagnostic yield and low specificity, especially for lesions located in peripheral pulmonary locations. Even with the emergence of robotic-assisted platforms, bronchoscopy diagnostic yields remain below 80%.

Aim

The aim of this study was to determine whether in situ single-point fingerprint (800 to 1700    cm - 1 ) Raman spectroscopy coupled with machine learning could detect lung cancer within an otherwise heterogenous background composed of normal tissue and tissue associated with benign conditions, including emphysema and bronchiolitis.

Approach

A Raman spectroscopy probe was used to measure the spectral fingerprint of normal, benign, and cancer lung tissue in 10 patients. Each interrogated specimen was characterized by histology to determine cancer type, i.e., small cell carcinoma or non-small cell carcinoma (adenocarcinoma and squamous cell carcinoma). Biomolecular information was extracted from the fingerprint spectra to identify biomolecular features that can be used for cancer detection.

Results

Supervised machine learning models were trained using leave-one-patient-out cross-validation, showing lung cancer could be detected with a sensitivity of 94% and a specificity of 80%.

Conclusions

This proof of concept demonstrates fingerprint Raman spectroscopy is a promising tool for the detection of lung cancer during diagnostic procedures and can capture biomolecular changes associated with the presence of cancer among a complex heterogeneous background within less than 1 s.

Present and Future Application of Energy Devices in Thoracic Surgery

In the last decade, many energy devices have entered day-to-day practice in thoracic surgery. Some have proven and recognized applications, whereas others still require further trials. Nevertheless, currently used devices continue to be improved on and new applications for current devices will be evaluated. Ultimately, novel applications of energy in thoracic surgery and refinement in technology will hopefully allow for safer and less invasive techniques for patients requiring thoracic surgical procedures. In this article, we review the present and future applications of energy devices in thoracic surgery.

Balloon Dilation for Endosonographic Staging in Esophageal Cancer: A Phase 1 Clinical Trial

BACKGROUND

Dilation in patients with malignant esophageal strictures precluding the passage of the endoscopic ultrasonography (EUS) scope allows complete evaluation; however, it may be associated with complications. This study evaluates the safety and clinical value of balloon dilation to complete EUS in patients with stenotic esophageal cancers.

METHODS

This study consists of a phase I clinical trial. One-hundred-and fifty patients were recruited. Endoscopic balloon dilation was performed before EUS in patients with high-grade stenosis. The analysis was focused on the ability to complete an endosonographic examination after dilation, 30-day morbidity, and change in the final stage or definitive management based on the completed endosonographic examination.

RESULTS

Dilation was required in 55 patients (36.7%), with a complication rate of 10.9% (n = 6). Dilation allowed completion of EUS in 53 patients (96.4%), leading to a modification of the clinical stage for 18 patients (34%) and a deviation in the treatment plan in 7 patients (13.2%). No differences were found in these variables when compared with the group that did not require dilation (26.3% and 14.7%, P = .33 and P = .79, respectively). Dilation was associated with more advanced disease on final pathology among patients who underwent surgical resection (P = .006).

CONCLUSIONS

High-grade malignant esophageal strictures that preclude the passage of the ultrasound probe are associated with advanced stage disease. Owing to the high risk of perforation and the limited benefit in staging, balloon dilation to complete the EUS staging should be avoided. (Clinicaltrials.gov identifier: NCT01950442.).

Heat production during pulmonary artery sealing with energy vessel-sealing devices in a swine model

OBJECTIVES

Energy vessel-sealing devices are being increasingly utilized to seal pulmonary artery (PA) branches during lobectomy. Heat from these devices can potentially injure surrounding tissues. We evaluated heat production from devices in a live animal model.

METHODS

PA branches were sealed in pigs with 4 energy vessel-sealing devices: 2 ultrasonic (US), 1 advanced bipolar or 1 mixed US and bipolar (mixed) device. Thermocouples were implanted in tissue surrounding the PA branch being sealed to measure tissue temperature. A thermal camera measured the sealing site and the temperatures of the instruments. Pathological analysis was performed on PA stumps to identify thermal damage.

RESULTS

A total of 37 PA branches were sealed in 4 pigs. Maximum tissue heat measured by the thermocouples for the 2 US, advanced bipolar and mixed devices was 42, 39, 42 and 46°C, respectively. The mean tissue temperatures at the site of the sealing measured with the thermal camera were 78, 75, 70 and 82°C (P = 0.834) and the mean instrument blade temperatures were 224, 195, 83 and 170°C (P = 0.000005) for the 2 US, advanced bipolar and mixed devices, respectively. The mean diameter of the region with tissue reaching 60°C or more measured with the thermal camera was between 4 and 6 mm for the 4 devices (P = 0.941). On pathological analysis, PA stumps had either thermal damage on the adventitia and external media (26/37) or transmural damage (11/37) at 1 mm from sealed site.

CONCLUSIONS

A 3-mm safety margin between the instrument blades and vital structures is recommended. Instrument blades can reach high temperatures that may cause tissue damage.

Placental patterns as seen on ultrasonography

The first exciting days of being able to see the placenta in utero and localize the site of implantation are over. It is now commonplace to ask about the placental site automatically when requesting an ultrasonogram of a pregnant uterus, and it is taken for granted that this will be mentioned in the report. However, with the new and more sophisticated ultrasound equipment now in use, it is today incumbent on the ultrasonologist to give a short report on the placenta and the umbilical cord, in addition to the report on the fetus.

Four-Dimensional Impedance Manometry in Esophageal Motility Disorders

INTRODUCTION

Four-dimensional high-resolution impedance manometry (4D HRM) uses impedance to estimate esophageal luminal cross-sectional area and track nadir impedance to measure intrabolus pressure (IBP). We aimed to determine whether 4D HRM metrics could define abnormal esophagogastric junction (EGJ) opening between Chicago Classification version 4.0 motility disorders and compare 4D HRM with functional lumen imaging probe (FLIP) metrics.

METHODS

Symptomatic adult patients who completed high-resolution impedance manometry and FLIP were included and compared with an asymptomatic control group. 4D HRM analysis used custom-built software to measure IBP, maximum EGJ diameter, and distensibility index on supine test swallows. 4D HRM metrics were compared with FLIP EGJ metrics.

RESULTS

Ninety patients (31 normal motility, 16 ineffective esophageal manometry, 9 absent contractility, 8 conclusive EGJ outflow obstruction [EGJOO], 12 type I achalasia, 14 type II achalasia, 12 type III achalasia, and 34 asymptomatic controls) were included. Phase 2 and 3 IBP was higher in type II and III achalasia compared with controls and normal motility groups ( P < 0.03). Maximum EGJ diameter and EGJ-distensibility index in the conclusive EGJOO and achalasia groups were significantly lower than in controls and normal motility groups ( P < 0.03). 4D HRM identified 37 of 44 (84%) subjects with normal EGJ opening and 29 of 39 (74%) subjects with reduced EGJ opening on FLIP.

DISCUSSION

4D HRM metrics correlated with expected clinical observations across a spectrum of esophageal motility disorders and defined EGJ obstruction. 4D HRM metrics may have value in defining EGJ obstruction in equivocal cases related to EGJOO or absent peristalsis.

Ultrasound and barium study in the evaluation of upper abdominal masses

Numerous radiological procedures are now available for investigation of upper abdominal masses of uncertain aetiology; however, certain limitations and pitfalls are associated with these procedures. It is suggested that the initial use of ultrasound and barium studies would frequently provide either a definite diagnosis or lead to the next appropriate line of investigation. The importance of not omitting the barium study is stressed.

Intrahepatic foreign bodies--the ultrasound appearances

Steel, rock and lead fragments in 3 cases were shown on static and real-time ultrasound scans to be intrahepatic in position. The materials could be differentiated from one another by their ultrasonic characteristics. The findings guided the surgical removal in 1 patient.

The Use of Energy in VATS Lobectomy

VATS lobectomy is a safe and effective treatment strategy for operable stage I and II lung cancer. It has a similar five-year survival compared to open lobectomy (thoracotomy). VATS lobectomy is associated with less postoperative complications and shorter hospital length of stay when compared to lobectomy by thoracotomy. VATS lobectomy has not been widely adopted by the thoracic surgical community, in part, due to technical reasons. Pulmonary artery branch manipulation in VATS lobectomy is one of the most critical parts of the procedure, especially when endostaplers are used for ligation and division of the vessel. Energy devices have improved in recent years, and their application for VATS lobectomy is gaining traction. There is more and more evidence supporting the safety of ultrasonic shears to seal and divide small pulmonary artery branches. These devices are smaller and finer than endostaplers and have the potential to reduce the risk of PA injury. These more user-friendly devices may enable thoracic surgeons who are currently performing lobectomy by thoracotomy to transition to VATS. Energy devices are also useful for hilar dissection and mediastinal lymph node dissection in VATS lobectomy.

Effect of esophageal body recoil on clinical outcomes in non-spastic achalasia

BACKGROUND

Despite the established efficacy of achalasia treatments on symptomatic outcomes, there are limited data evaluating the treatment effect on esophageal dilatation. This study aimed to assess the effect achalasia treatment on esophageal dilatation and the effect of esophageal width reduction ("recoil") on clinical outcomes.

METHODS

Patients with type I or type II achalasia that completed high-resolution manometry (HRM), functional lumen imaging probe (FLIP), and timed barium esophagram (TBE) pre and post treatment were included. Esophageal width was measured using TBE. Focused subgroup analysis was performed on patients with normal posttreatment EGJ opening on FLIP. Good clinical outcomes were defined as barium column height of <5 cm at 5 min and Eckardt Score ≤3.

KEY RESULTS

Sixty-nine patients (41% type I and 59% type II) were included. Esophageal width decreased from pre to post treatment mean (SD) 4.2 (1.3) cm-2.8 (1.2) cm; p < 0.01. In the normal post treatment EGJ opening subgroup, esophageal width was less in patients with good TBE outcome compared to poor outcome mean (SD) 2.2 (0.7) cm versus 3.2 (1.4) cm (p < 0.01), but did not differ in good versus poor symptomatic outcome groups. Esophageal width recoil >25% posttreatment was associated with a greater rate of good TBE outcome (71% vs. 50%, p = 0.04) and good symptomatic outcome (88% vs. 50%; p = 0.04).

CONCLUSIONS AND INFERENCES

Esophageal recoil was associated with good achalasia treatment outcome in patients without posttreatment EGJ obstruction. This suggests that mechanical properties of the esophageal wall, likely associated with tissue remodeling, play a role in clinical outcomes following achalasia treatment.

Diagnostic Accuracy of Timed Barium Esophagram for Achalasia

BACKGROUND AND AIMS

Timed barium esophagram (TBE) is commonly used to evaluate esophageal motor disorders, though its accuracy is limited. The lack of standardized criteria for TBE interpretation, coupled with reliance on single measurements and outdated reference standards, limits its effectiveness. This study aimed to reexamine the accuracy of TBE interpretation using the Standards for Reporting of Diagnostic Accuracy Studies (STARD) approach and updated reference standards.

METHODS

Adult patients with esophageal dysphagia were prospectively enrolled from 2019 to 2022 and underwent motility testing with esophageal manometry, functional lumen imaging probe (FLIP) panometry, and TBE. TBE accuracy for predicting achalasia/FLIP+ esophagogastric junction (EGJ) outflow obstruction, as defined by Chicago Classification 4.0 and FLIP, was assessed using 2 approaches: barium column height >2 cm at 5 minutes/impacted tablet and a classification tree model.

RESULTS

The study included 290 participants: 121 (42%) with EGJ outflow disorders, 151 (52%) without, and 18 (6%) with inconclusive results. The optimal classification tree had 3 levels: maximum esophageal body width at the top, maximum EGJ diameter and barium height at the second level, and tablet passage at the bottom. The TBE column height and tablet approach had a sensitivity of 77.8%, specificity 86.0%, and accuracy 82.2%, whereas the classification tree model achieved a sensitivity of 84.2%, specificity 92.1%, and accuracy of 88.3%.

CONCLUSIONS

TBE can accurately identify achalasia/FLIP+ EGJ outflow obstruction when using multiple metrics in a classification tree model. This provides a simple, standardized approach to TBE interpretation that is superior to traditional single-metric methods.

A Software Framework for the Functional Lumen Imaging Probe-Mechanics (MechView)

BACKGROUND

The functional lumen imaging probe (FLIP) has proven to be a versatile device for diagnosing esophageal motility disorders and estimating esophageal wall compliance, but there is a lack of viable software for quantitative assessment of FLIP measurements.

METHODS

A Python-based web framework was developed for a unified assessment of FLIP measurements including clinical metrics such as esophagogastric junction (EGJ) distensibility index (DI), maximum EGJ opening diameter, mechanics-based metrics for estimating strength, and effectiveness of contractions, such as contraction power and displaced volume, and machine learning-based clustering and predictive algorithms such as the virtual disease landscape (VDL) and EGJ obstruction probability. The clinical and VDL probability metrics were then validated using FLIP data from 121 subjects constituting different categories of EGJ opening which were diagnosed by expert clinicians.

RESULTS

The clinical metrics estimated by the framework matched the manual diagnosis of the clinicians. Misclassifications were minimal and were mostly between neighboring groups, that is, normal and borderline normal or borderline normal and borderline reduced EGJ opening. Similar results were also obtained for the VDL probability metrics. The misclassifications were further analyzed by clinicians and approved.

CONCLUSION

The FLIP web framework was developed and validated to reliably estimate various clinical, mechanical, and machine learning-based metrics for diagnosing esophageal motility disorders.

Endoscopic Prediction of Achalasia: Putting the CART Before the CARS

BACKGROUND AND AIMS

Endoscopy can detect features indicative of esophageal dysmotility, but standardized approaches for diagnosing achalasia based on these findings remain limited. Recently, the CARS score was developed to address this gap. This study aimed to evaluate the diagnostic utility of endoscopy in identifying achalasia, using the STARD framework and current reference standards.

METHODS

Adult patients with esophageal symptoms were prospectively enrolled from 2018 to 2023 and evaluated using endoscopy, esophageal manometry, FLIP panometry, and barium esophagram. The CARS score was assigned to endoscopic videos by two raters blinded to other clinical details. The diagnostic accuracy of the CARS score for predicting achalasia, based on Chicago Classification v4.0, was assessed through two interpretation methods: binary cutoffs for the total score and a classification tree model.

RESULTS

316 patients were included: 115 patients with achalasia (36%), 113 with normal motility (36%), and 88 with other manometric findings (28%). A CARS score ≥ 4 demonstrated 72% sensitivity and 99% specificity for achalasia, while a score ≥ 3 had 83% sensitivity and 96% specificity. The optimal classification tree had three levels (resistance score at the top, followed by anatomy and content scores, with hernia presence at the bottom) and had a sensitivity of 90% and a specificity 92% for achalasia.

CONCLUSION

Endoscopy can accurately identify achalasia with high specificity using the CARS score. While motility testing to confirm an achalasia diagnosis remains essential prior to therapy, a high CARS score may help in the early identification of achalasia, especially in settings where motility testing is not readily available.