Journal of Yeungnam Medical Science

Case report

Physical therapy, Sports Therapy, and Rehabilitation
Development of an RGB-depth camera-based gait analysis system: a single-case study of a patient with stroke: Min Cheol Chang, Juyeon Kim, Jun Sung Moon, Wooktae Park, Gun Woo Lee, Yoo Jin Choo; J Yeungnam Med Sci. 2026;43:15. Published online January 24, 2026; DOI: https://doi.org/10.12701/jyms.2026.43.15

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Abstract PDF Supplementary Material: Alterations in gait patterns often indicate health status, and their analysis enables the diagnosis and assessment of various health conditions. This study aimed to develop a noncontact gait analysis system using red, green, and blue-depth (RGB-D) cameras and to evaluate its potential clinical applicability. A single case study was conducted to assess changes in the gait patterns of a patient with stroke before and after the application of an ankle-foot orthosis. Twenty walking trials were recorded to evaluate the key gait parameters. The custom RGB-D camera-based gait analysis system demonstrated the potential to rapidly quantify key gait parameters in the patient. Compared with normative data, it effectively identified characteristic stroke-related gait impairments such as shorter step lengths and slower gait speeds. However, the intraclass correlation coefficient analysis indicated low measurement reliability. Although the stance time and minimum knee angle on the left and right sides exceeded the standard error of measurement (SEM), no changes exceeded the minimal detectable change (MDC) criteria. Moreover, other gait parameters did not show significant changes beyond SEM or MDC, limiting the interpretability of the results. Therefore, further technological developments and data collection are required to improve test-retest reliability and sensitivity to change.

Original articles

Neurology
Characteristics of mDIXON-Quant and proton magnetic resonance spectroscopy imaging of thigh skeletal muscles in patients with stroke-related sarcopenia: a prospective case-control study: Ruihong Yao, Bu-Lang Gao, Jihong Hu, Wei Zhao, Yang Tian, Liqing Yao, Yongneng Jiang; J Yeungnam Med Sci. 2025;42:49. Published online August 28, 2025; DOI: https://doi.org/10.12701/jyms.2025.42.49

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Abstract PDF: Background
This study was performed to investigate the imaging features of mDIXON-Quant sequence (Philips Healthcare) and proton magnetic resonance spectroscopy (1H-MRS) of thigh muscles in patients with stroke-related sarcopenia (SRS).
Methods
This prospective case-control study was conducted in 40 patients with SRS, 40 patients without sarcopenia who had a stroke, and 40 healthy volunteers using mDIXON-Quant and 1H-MRS scanning. Skeletal muscle cross-sectional area (CSA) and fat fraction (FF) were analyzed.
Results
The skeletal muscle FF value was significantly higher (p<0.05) in patients with SRS and on the affected side. The extracellular fat content of the rectus femoris muscle in normal controls was 4× to 10× the intracellular fat content. A significant increase (p<0.05) in intra- and extracellular fat content was detected in the SRS group. The degree of fat content increase in the SRS group was significantly lower (p<0.05) for extracellular fat than intracellular fat, with a ratio of extracellular to intracellular fat content of <4. The intracellular fat content was significantly higher (p<0.05) in the SRS group. A moderate-to-strong positive correlation existed between intracellular fat content (area 1) and muscle fat percentage. The degree of decrease in CSA in the posterior muscle group was significantly greater (p<0.05).
Conclusion
Thigh muscle CSA significantly decreased in SRS, while FF increased. The intra- and extracellular fat content of the skeletal muscle was significantly increased, especially the intracellular fat content. SRS was confirmed when the ratio of extracellular fat content to intracellular fat content was <4.

Physical therapy, Sports Therapy, and Rehabilitation
Storing information of stroke rehabilitation patients using blockchain technology: a software study: Min Cheol Chang; J Yeungnam Med Sci. 2022;39(2):98-107. Published online September 7, 2021; DOI: https://doi.org/10.12701/yujm.2021.01368

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2 Crossref

Abstract PDF

Background
Stroke patients usually experience damage to multiple functions and a long rehabilitation period. Hence, there is a large volume of patient clinical information. It thus takes a long time for clinicians to identify the patient’s information and essential pieces of information may be overlooked. To solve this, we stored the essential clinical information of stroke patients in a blockchain and implemented the blockchain technology using the Java programming language.
Methods
We created a mini blockchain to store the medical information of patients using the Java programming language.
Results
After generating a unique pair of public/private keys for identity verification, a patient’s identity is verified by applying the Elliptic Curve Digital Signature Algorithm based on the generated keys. When the identity verification is complete, new medical data are stored in the transaction list and the generated transaction is verified. When verification is completed normally, the block hash value is derived using the transaction value and the hash value of the previous block. The hash value of the previous block is then stored in the generated block to interconnect the blocks.
Conclusion
We demonstrated that blockchain can be used to store and deliver the patient information of stroke patients. It may be difficult to directly implement the code that we developed in the medical field, but it can serve as a starting point for the creation of a blockchain system to be used in the field.

Citations

Citations to this article as recorded by

Prediction of motor outcome based on brain perfusion single photon emission computed tomography in corona radiata infarct
Eunjung Kong, Donghwi Park, Min Cheol Chang
International Journal of Neuroscience.2024; 134(12): 1470. CrossRef
Use of QR Codes for Promoting a Home-Based Therapeutic Exercise in Patients with Lumbar Disc Herniation and Lumbar Spinal Stenosis: A Prospective Randomized Study
Min Cheol Chang, Donghwi Park, Yoo Jin Choo
Journal of Pain Research.2022; Volume 15: 4065. CrossRef

Case report

Physical therapy, Sports Therapy, and Rehabilitation
Safety and effectiveness of early cardiac rehabilitation in a stroke patient with heart failure and atrial fibrillation: a case report: Sang Cheol Lee, Eun Jae Ko, Ju Yeon Lee, Ae Lee Hong; Yeungnam Univ J Med. 2021;38(4):361-365. Published online March 22, 2021; DOI: https://doi.org/10.12701/yujm.2020.00885

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Abstract PDF: Stroke patients have reduced aerobic capacity. Therefore, intensive structured exercise programs are needed. We report the case of a patient with stroke and cardiac disease who underwent early inpatient cardiac rehabilitation (CR). A 38-year-old male patient with atrial fibrillation, heart failure, and cerebral infarction underwent a symptom-limited exercise tolerance test (ETT) without any problems on day 45 after admission. He completed a 2-week inpatient program and an 8-week home-based CR program. Follow-up ETT showed increased exercise capacity. The present case might be the first to report a safely performed CR program in a patient with stroke and cardiac comorbidity in Korea. Systematic guidance is needed for post-stroke patients to receive safe and effective CR for the secondary prevention of stroke and cardiovascular risk.

Original article

Emergency and Critical Care Medicine
Determining the correlation between outdoor heatstroke incidence and climate elements in Daegu metropolitan city: Jung Ho Kim, Hyun Wook Ryoo, Sungbae Moon, Tae Chang Jang, Sang Chan Jin, You Ho Mun, Byung Soo Do, Sam Beom Lee, Jong-yeon Kim; Yeungnam Univ J Med. 2019;36(3):241-248. Published online July 2, 2019; DOI: https://doi.org/10.12701/yujm.2019.00248

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1 Crossref

Abstract PDF

Background
Heatstroke is one of the most serious heat-related illnesses. However, establishing public policies to prevent heatstroke remains a challenge. This study aimed to investigate the most relevant climate elements and their warning criteria to prevent outdoor heatstroke (OHS).
Methods
We investigated heatstroke patients from five major hospitals in Daegu metropolitan city, Korea, from June 1 to August 31, 2011 to 2016. We also collected the corresponding regional climate data from Korea Meteorological Administration. We analyzed the relationship between the climate elements and OHS occurrence by logistic regression.
Results
Of 70 patients who had heatstroke, 45 (64.3%) experienced it while outdoors. Considering all climate elements, only mean heat index (MHI) was related with OHS occurrence (p=0.019). Therefore, the higher the MHI, the higher the risk for OHS (adjusted odds ratio, 1.824; 95% confidence interval, 1.102–3.017). The most suitable cutoff point for MHI by Youden’s index was 30.0°C (sensitivity, 77.4%; specificity, 73.7%).
Conclusion
Among the climate elements, MHI was significantly associated with OHS occurrence. The optimal MHI cutoff point for OHS prevention was 30.0°C.

Citations

Citations to this article as recorded by

Ambient heat exposure and kidney function in patients with chronic kidney disease: a post-hoc analysis of the DAPA-CKD trial
Zhiyan Zhang, Hiddo J L Heerspink, Glenn M Chertow, Ricardo Correa-Rotter, Antonio Gasparrini, Niels Jongs, Anna Maria Langkilde, John J V McMurray, Malcolm N Mistry, Peter Rossing, Robert D Toto, Priya Vart, Dorothea Nitsch, David C Wheeler, Ben Caplin
The Lancet Planetary Health.2024; 8(4): e225. CrossRef

Original Article

Cardiology and Cardiovascular Medicine
The usefulness of newly developed R2CHA2DS2-VASc score and comparison with CHADS2 and CHA2DS2-VASc scores in atrial fibrillation patients.: Jae Hoon Kwak, Se Hwan Yeo, Yeo Un Kim, Jin Suk Lee, Byong Kyu Kim, Jin Wook Chung, Jun Ho Bae, Deuk Young Nah, Kwan Lee; Yeungnam Univ J Med. 2016;33(1):8-12.; DOI: https://doi.org/10.12701/yujm.2016.33.1.8

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Abstract PDF: BACKGROUND
The decision to administer oral anticoagulation therapy depends on accurate assessment of stroke risk in patients with atrial fibrillation (AF). Various stroke risk stratification schemes have been developed to help inform clinical decision making. The CHADS2 and CHA2DS2-VASc scores have been used in estimating the risk of stroke in patients with AF. Recently R2CHA2DS2-VASc score was developed. The objective of the current study is to validate the usefulness of the R2CHA2DS2-VASc score and to compare the accuracy of the CHADS2, CHA2DS2-VASc, and R2CHA2DS2-VASc scores in predicting a patient's risk of stroke. METHODS: Based on medical records, we conducted a retrospective study of patients hospitalized with AF from March 2011 to July 2013. A total of 448 AF patients were included in this study. The receiver operating characteristic (ROC) curve analysis in MedCalc was used for comparison with respective diagnostic values. RESULTS: The patient characteristics showed male predominance (60.9%). Among the 448 AF patients, 131 (29.2%) patients had strokes during the study. A R2CHA2DS2-VASc score of more than 5 is the optimal cut-off value for prediction of stroke. A risk score of three, the area under the ROC curve (AUC) of R2CHA2DS2-VASc score (AUC 0.631; 95% confidence interval, 0.585-0.679) was the highest. A significant difference was observed between AUC for R2CHA2DS2-VASc, CHADS2, and CHA2DS2-VASc scores, but no meaningful difference between CHADS2 and CHA2DS2-VASc scores. CONCLUSION: We determined the usefulness of the R2CHA2DS2-VASc score, which showed better association with stroke than the CHADS2 and CHA2DS2-VASc scores.

Case Report

Cardiology and Cardiovascular Medicine
Unusual paradoxical embolic stroke in a patient with persistent left superior vena cava.: Tae Hun Kwon, Kang Un Choi, Byung Jun Kim, Jae Ho Cho, Jae Young Lee, Kyu Hwan Park, Sang Hee Lee, Jang Won Son; Yeungnam Univ J Med. 2015;32(2):118-121.; DOI: https://doi.org/10.12701/yujm.2015.32.2.118

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Abstract PDF: Cardiogenic embolic stroke accounts for approximately 20% of ischemic strokes and the likelihood of its recurrence is high. Paradoxical embolism may be an important cause of cardioembolic stroke, which can be evaluated through multiple diagnostic modalities including transesophageal echocardiography (TTE) or transcranial Doppler. A persistent left superior vena cava (PLSVC) is a rare congenital vascular anomaly, which mainly drains to the right atrium via the coronary sinus. Although rare, PLSVC draining into the left heart predisposes the patient to paradoxical embolism through a right-to-left shunt. We report on a 78-year-old female patient with an ischemic stroke associated with PLSVC draining into the left atrium through the pulmonary vein, which was investigated via TTE with an agitated saline test and computed tomography.

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