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result(s) for
"Thankappan, Krishnakumar"
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Artificial intelligence tools for the assessment and management of dysphagia: protocol for a scoping review
by
Krishnan, Rahul
,
Karuveettil, Vineetha
,
Thankappan, Krishnakumar
in
Artificial Intelligence
,
Citation management software
,
Computer vision
2025
IntroductionDysphagia, or difficulty in swallowing, significantly impacts the quality of life of the affected individuals. Diagnostic approaches, including video fluoroscopic swallowing studies and flexible endoscopic evaluation of swallowing, are the most commonly used methods for assessing swallowing function. Recent advancements have led to the development of artificial intelligence (AI), including machine learning (ML) and deep learning (DL), which will provide innovative approaches to dysphagia diagnosis and treatment planning. There is a limited synthesis of literature on AI tools in dysphagia. There is an urgent need for a more rigorous and structured scoping review that can address the existing gaps, provide a more comprehensive evidence synthesis, and establish clearer guidelines for the clinical implementation of AI in assessments and management of dysphagia. This review will include studies focusing on AI tools such as ML, DL and computer vision for assessing and managing dysphagia. The context will be clinical or therapeutic settings, and all language articles will be considered for the review. Studies not involving AI technologies, those without clinical outcomes and ethical approval, and those focusing solely on the paediatric population will be excluded. This scoping review will systematically map and synthesise the existing literature on the use of AI tools for the assessment and management of dysphagia.Methods and analysisThis scoping review will follow JBI methodology and PRISMA ScR guidelines. Information to be searched from January 2000 to May 2025 will include MEDLINE (via Ovid), Scopus, CINAHL (via EBSCOhost), Cochrane Library, JBI Evidence Synthesis, ProQuest and Google Scholar. The titles, abstracts and full texts will be screened by two independent reviewers. Data extraction will use a study-specific customised form, with descriptive analysis employed to categorise studies by AI tools and outcomes.Ethics and disseminationEthical approval is not mandatory for this scoping review as it does not entail the collection of any individual patient data. Secondary data from publicly accessible research papers will be used. All the data sources will be appropriately cited. The findings will be propagated through peer-reviewed publications and scientific presentations.Trial registration numberOpen Science Framework: DOI 10.17605/OSF.IO/DYCE9.
Journal Article
Tobacco use and its impact on survival in young patients with oral cancer
by
Thankappan, Krishnakumar
,
Subramaniam, Narayana
,
Balasubramanian, Deepak
in
Cancer
,
Cancer patients
,
Care and treatment
2023
Background:
Tobacco is a major risk factor associaetd with developing oral factor. Recent studies have shown that the age of onset, especially in Asia, is reducing. This study was to determine if tobacco exposure correlated with prognosis in oral squamous cell carcinoms (OSCC) based on age at diagnosis.
Methods:
Six hundred and forty three patients of OSCC treated in our institution were divided into four groups, younger patients (≤45 years) with or without tobacco exposure and older patients (>45 years) with or without tobacco exposure, and compared with respect to prognostically relevant variables, disease-free survival (DFS) and overall survival (OS). Survival analysis was performed.
Results:
The percentage of those with tobacco exposure was comparable in both age groups. Tobacco correlated with known pathological determinants in OSCC; however, perineural invasion, lymphovascular invasion, and extranodal extension were significantly more common in the young. On survival analysis, tobacco exposure impacted OS (P = 0.04) and DFS (P = 0.03) in patients ≤45 years, and not in older patients >45 years. On multivariate analysis, tobacco exposure in the young was significantly associated with recurrence (P = 0.03, hazard ratio (HR) 1.77, 95% confidence interval (CI) 1.07-2.94) but not survival.
Conclusion:
Younger patients with a history of tobacco use have a significantly higher risk of recurrence and mortality due to OSCC, but this difference could not be attributed to any of the known prognostic determinants in OSCC. Younger patients also had more adverse pathological features. Whether this occurs because of altered disease biology or pathways of carcinogenesis in the young with tobacco exposure is unknown. Younger tobacco users with oral cancer are more likely to have a poor prognosis.
Journal Article
Maxillary reconstruction: Current concepts and controversies
2014
Maxillary reconstruction is still an evolving art when compared to the reconstruction of the mandible. The defects of maxilla apart from affecting the functions of the speech, swallowing and mastication also cause cosmetic disfigurement. Rehabilitation of the form and function in patients with maxillary defects is either by using an obturator prosthesis or by a surgical reconstruction. Literature is abundant with a variety of reconstructive methods. The classification systems are also varied, with no universal acceptance of any one of them. The oncologic safety of these procedures is still debated, and conclusive evidence in this regard has not emerged yet. Management of the orbit is also not yet addressed properly. Tissue engineering, that has been hyped to be one of the possible solutions for this vexing reconstructive problem, has not come out with reliable and reproducible results so far. This review article discusses the rationale and oncological safety of the reconstructing the maxillary defects, critically analyzes the classification systems, offers the different reconstructive methods and touches upon the controversies in this subject. The management of the retained and exenterated orbit associated with maxillectomy is reviewed. The surgical morbidity, complications and the recent advances in this field are also looked into. An algorithm, based on our experience, is presented.
Journal Article
Volume and Location of the Defect as Predictors of Swallowing Outcome After Glossectomy: Correlation with a Classification
by
Mydhili, Mayadevi
,
Joseph, Shawn T
,
Sukumaran Sheejamol Velickakathu
in
Classification
,
Defects
,
Dysphagia
2021
This study aimed to characterize the swallowing outcomes after glossectomy and analyze factors affecting them. An attempt is made to propose a classification system and corroborate it to the results. This is a cross-sectional study to assess swallowing in carcinoma tongue patients treated surgically with or without reconstruction, followed by adjuvant therapy as indicated. One hundred and six patients were evaluated with videofluoroscopy (VFS). Volume defects were classified as I: less than one-third, II: one-third to half, III: half to two-thirds, IV: two-thirds to total glossectomy. Location was assigned as lateral, tip, and sulcus defects. Predictors were T stage, surgical approach, volume, location, and adjuvant radiotherapy. Chi-square and logistic regression were used for statistical analysis. Defects were Class I, II, III, and IV in 36, 42, 16, and 12 patients, respectively. Adjuvant radiotherapy was given in 40% of cases. Mean evaluation time was 14 months from treatment. On, Functional Oral Intake Scale (FOIS) score, as the Class of the defect increased, the percentage of patients with low scores (poor swallowing outcomes) showed an increasing trend (p < 0.001). Defect volume, T stage, approach, and radiotherapy correlated significantly with an abnormality of all VFS parameters (p < 0.001). On multivariate analysis, defect volume remained an independent predictor for oral parameters; radiotherapy emerged as the only independent predictor for pharyngeal parameters. The incremental volume of the defect is a significant independent predictor of swallowing. Based on this, we propose a classification for glossectomy.
Journal Article
Mapping of head and neck cancer patient concerns inventory scores on to Euroqol-Five Dimensions-Five Levels (EQ-5D-5L) health utility scores
by
Raj Manu
,
Krishnakumar, Thankappan
,
Iyer Subramania
in
Activities of daily living
,
Algorithms
,
Disease
2022
BackgroundThe purpose of this paper is to map the number of concerns on the dimensions in Head and Neck Patient Concerns Inventory (PCI) on to the health utility (HU) index scores on Euroqol-Five Dimensions-Five levels {EQ-5D-5L) .MethodsThis is a cross-sectional survey conducted in patients who have completed their treatment. Four candidate models were considered, three based on ordinary least squares regression (OLS) and one two-parts model.ResultsA reduced OLS model based on ‘Physical and functional’, ‘Treatment-related’, and ‘Psychological, emotional and spiritual well-being’ domains was found best on the estimation sample. This was validated externally on a separate sample.ConclusionsThis is the first study that mapped a non-QOL tool to generate HU scores on EQ-5D-5L. The proposed mapping algorithm can estimate the cost–utility in economic evaluation studies when HU scores are not directly available. The algorithm will be best suited for studies in low-middle income countries.
Journal Article
Interdisciplinary Telemedicine in the Management of Dysphagia in Head and Neck
by
Sivakumar Vidhyadharan
,
Ouyoung, Melody
,
Limbachiya, Shashikant Vishnubhai
in
Dysphagia
,
Feasibility studies
,
Head & neck cancer
2018
The study considered the feasibility and impact of interdisciplinary telemedicine discussions in the management of post-treatment dysphagia in patients with head and neck tumors. This is a retrospective analysis of patients with persistent dysphagia after treatment for head and neck pathology, at an institute in India. The cases were discussed in the telemedicine meeting conducted between host institute and a second unit in the United States. A monthly meeting was organized, using an internet-based video conference system. The ongoing swallowing problems and management were presented, and through discussions, a plan for further management was formulated and carried out. The Functional Oral Intake Scale (FOIS) was measured before and after the implementation of the plan. Twenty-six patients were discussed, out of which, 22 were head and neck malignancies. The recommendations concurred with that of the host unit in 18, differed for three and additive in five patients. The pre-treatment mean FOIS was 1.46 with a standard deviation of 0.989 and post-treatment mean improved to 3.92 with a standard deviation of 1.809 (p < 0.0001). The present study supports the success of an interdisciplinary telemedicine meeting to manage difficult cases of dysphagia in head and neck. The outcome in terms of the FOIS score improved significantly after implementing them. In addition to the direct patient benefits, the meeting helped to facilitate interdepartmental collaboration between two units treating similar sets of patients across the globe, in specialized clinical areas like dysphagia management.
Journal Article
Contrasting clinical outcomes and socio‐economic impact of young versus elderly‐onset oral squamous cell carcinoma, a novel health economic analysis
by
Kekatpure, Vikram
,
Mitra, Arun
,
Pattatheyil, Arun
in
Adjuvant therapy
,
Adjuvants, Immunologic
,
Aged
2024
Objectives The incidence of young‐onset oral squamous cell carcinoma (OSCC) is growing, even among non‐smokers/drinkers. The effects of adverse histopathological features on long‐term oncologic outcomes between the young and old are controversial and confounded by significant heterogeneity. Few studies have evaluated the socio‐economic impact of premature mortality from OSCC. Our study seeks to quantify these differences and their economic impact on society. Materials and Methods Four hundred and seventy‐eight young (<45 years) and 1660 old patients (≥45 years) with OSCC were studied. Logistic regression determined predictors of recurrence and death. Survival analysis was calculated via the Kaplan–Meier method. A separate health economic analysis was conducted for India and Singapore. Years of Potential Productive Life Lost (YPPLL) were estimated with the Human Capital Approach, and premature mortality cost was derived using population‐level data. Results Adverse histopathological features were seen more frequently in young OSCC: PNI (42.9% vs. 35%, p = 0.002), LVI (22.4% vs. 17.3%, p = 0.013) and ENE (36% vs. 24.5%, p < 0.001). Although 5‐year OS/DSS were similar, the young cohort had received more intensive adjuvant therapy (CCRT 26.9% vs. 16.6%, p < 0.001). Among Singaporean males, the premature mortality cost per death was US$396,528, and per YPPLL was US $ 45,486. This was US$397,402 and US $ 38,458 for females. Among Indian males, the premature mortality cost per death was US$30,641, and per YPPLL was US $ 595. This was US$ 21,038 and US $ 305 for females. Conclusion Young‐onset OSCC is an aggressive disease, mitigated by the ability to receive intensive adjuvant treatment. From our loss of productivity analysis, the socio‐economic costs from premature mortality are substantial. Early cancer screening and educational outreach campaigns should be tailored to this cohort. Alongside, more funding should be diverted to genetic research, developing novel biomarkers and improving the efficacy of adjuvant treatment in OSCC.
Journal Article
Soft embalming of cadavers for training purposes: Optimising for long-term use in tropical weather
by
Thankappan, Krishnakumar
,
Ramu, Janarthanan
,
Reddy, Raghuveer
in
cadaver dissection
,
Embalming
,
flap harvest course
2017
ABSTRACT
Background:
Surgical and anatomical training has been found to be most optimally simulated in a cadaver than any other available methods. Soft embalming methods have made the bodies more ‘lifelike’ and better suited for training. The widely accepted soft embalming techniques, including Thiel embalming, are designed for temperate climates. Their use in tropical locations has been found to be associated with poor short-term and long-term preservation of the bodies. In fact, adequate reports from tropical countries on effective methods for soft embalming are lacking.
Materials and Methods:
This article details the modifications made in the Thiel embalming technique over a period of 2 years which has enabled us to preserve the anatomical features of bodies in an optimal way for longer periods in tropical conditions. This study was carried out in a tertiary care referral centre located in a tropical climate zone. A total of 13 frozen and thawed cadavers were used over a period of 2 years for developing such soft embalming technique. The efficacy of the technique was tested using these cadavers for varying types of surgical exercises on multiple occasions.
Results:
The conventionally described technique of Thiel embalming did not provide desired results. Hence, various modifications to this technique were instituted which helped us to get superior quality of soft-embalmed cadavers. In the final year, these cadavers were used successfully for workshops in flap dissection. Head and neck access surgery, arthroscopic and laparoscopic procedures as well as mock face and hand transplant dissections.
Conclusions:
The Theil embalming technique for obtaining soft embalmed cadavers, even though found to be best in many centres in the world, has not been found to be suitable to tropical weather. By modifying it, we have succeeded in developing a technique suitable to the tropical weather. This technique yields cadavers suitable for various surgical simulation exercises. This technique also allows the body to be optimally used over several months in multiple occasions. These modifications are very simple and have been described in detail enabling it to be adopted by any surgical skill laboratory in the tropical countries.
Journal Article
Outcomes following pharyngeal reconstruction in total laryngectomy – Institutional experience and review of literature
2018
ABSTRACT
Background:
Pharyngeal reconstruction is a challenging aspect of reconstruction after resections for head-and-neck cancer. The goals of reconstruction are to restore the continuity of the pharyngeal passage to enable oral alimentation and rehabilitation of speech wherever possible. This study was performed to determine the outcomes following pharyngeal reconstruction in total laryngectomy (TL) using different reconstructive options and to determine the predictors of pharyngocutaneous fistula (PCF) and swallowing dysfunction.
Materials and Methods:
Retrospective analysis of patient data between 2003 and 2010 of patients undergoing TL with partial or total pharyngectomy. Demographic and treatment details were collected and analysed. Univariate analysis was performed to determine predictors of PCF and swallowing dysfunction.
Results:
Fifty-seven patients underwent pharyngeal reconstruction following TL, 31 of whom had received prior treatment. Following tumour resection, 31 patients had circumferential defects and 26 patients had partial pharyngeal defects. The flaps used include pectoralis major myocutaneous flap (
n
= 29), anterolateral thigh flap (
n
= 8), gastric pull-up (
n
= 13) and free jejunal flap (
n
= 7). PCF was seen in 20 patients, of which 15 (75%) were managed conservatively and 5 required another surgery. At last follow-up, 99 patients (68%) were on full oral alimentation. Tracheo-oesophageal puncture and prosthesis insertion was done in 20 patients, of whom 17 (85%) developed satisfactory speech. Partial pharyngeal defects were associated with a higher risk of PCF on univariate analysis (
P
= 0.006) but were not significant on multivariate analysis. Post-operative swallowing dysfunction was significantly higher with hypopharyngeal involvement by tumour (
P
= 0.003).
Conclusion:
Pharyngeal reconstruction in TL is feasible with good results. Majority of the patients swallow and regain acceptable swallowing function within 3 months.
Journal Article
Concurrent chemoradiotherapy for head and neck cancers in older patients: Outcomes and their determinants
2019
INTRODUCTION: Meta-analyses have shown concurrent chemoradiotherapy (CCRT) provides no survival benefit over radiotherapy in patients of head and neck squamous cell carcinoma (HNSCC) aged over 70 years. This study was performed to determine the adverse-effect profile, compliance, functional and oncological outcomes in patients of HNSCC over 70 years of age treated with CCRT.
MATERIALS AND Methods: Retrospective analysis of stage III/IV HNSCC in patients above 70 years of age who received CCRT at our institution (n = 57). Cox-proportional hazards regression model was used for statistical analysis.
RESULTS: There were 57 patients of stage III/IV HNSCC who underwent curative CCRT. 61% completed chemotherapy with no deaths and acceptable toxicity. The predictors of recurrence were poorer performance status (P = 0.031) and treatment breaks (P = 0.04). Tube dependence was associated with 2.7 times higher risk of mortality (P = 0.005).
CONCLUSION: CCRT should be considered standard of care in those over seventy with good performance status. Patients with tube dependence have a higher risk of persistent disease or treatment related mortality.
Journal Article