Scratching is a main behavioral response accompanied by acute and chronic itch conditions, and has been quantified as an objective correlate to assess itch in studies using laboratory animals. Scratching has been counted mostly by human annotators, which is a time-consuming and laborious process. It has been attempted to develop automated scoring methods using various strategies, but they often require specialized equipment, costly software, or implantation of device which may disturb animal behaviors. To complement limitations of those methods, we have adapted machine learning-based strategy to develop a novel automated and real-time method detecting mouse scratching from experimental movies captured using monochrome cameras such as a webcam. Scratching is identified by characteristic changes in pixels, body position, and body size by frame as well as the size of body. To build a training model, a novel two-step J48 decision tree-inducing algorithm along with a C4.5 post-pruning algorithm was applied to three 30-min video recordings in which a mouse exhibits scratching following an intradermal injection of a pruritogen, and the resultant frames were then used for the next round of training. The trained method exhibited, on average, a sensitivity and specificity of 95.19% and 92.96%, respectively, in a performance test with five new recordings. This result suggests that it can be used as a non-invasive, automated and objective tool to measure mouse scratching from video recordings captured in general experimental settings, permitting rapid and accurate analysis of scratching for preclinical studies and high throughput drug screening.
Animals ; Animals, Laboratory ; Behavior, Animal ; Body Size ; Complement System Proteins ; Decision Trees ; Drug Evaluation, Preclinical ; Humans ; Injections, Intradermal ; Machine Learning ; Methods ; Mice ; Motion Pictures as Topic ; Pruritus ; Research Design ; Sensitivity and Specificity ; Video Recording

BACKGROUND AND OBJECTIVES: In recent years, surgical imaging has become important for legal and educational purposes. Significant improvements can be made from the surgeon's point of view in recording surgical procedures, particularly with respect to the action camera with high-definition video recordings. For otolaryngologic surgery, the surgical view is narrow, and there is a limit to proper imaging using the existing lens of the action camera. Therefore, we aimed to find out if we could obtain surgical images through simple modification of action camera. MATERIALS AND METHOD: The action camera was modified to match the surgical field. We selected a suitable lens for otolaryngology surgery using a calculation formula. The action camera was simply modified according to the design. The modified action camera can be mounted on the surgeon's head or the surgical light. We compared the images taken with the modified action camera and the images taken with the existing camcorder. The modified action camera was able to capture a narrow surgical field for otolaryngologic surgery. RESULTS: Unlike the existing method, we were able to obtain high-quality images using a modified action camera at the first person's viewpoint without auxiliary manpower. The action camera was considerably cost effective compared to other methods of recording surgery. CONCLUSION: The modified action camera allows for high-definition, cost-effective, and firstperson viewpoint for otolaryngologic surgery. The modified action camera allows for detailed videography that can enhance surgical teaching, presentation and patient education materials.
Education ; Head ; Methods ; Otolaryngology ; Patient Education as Topic ; Video Recording

OBJECTIVES: This study aimed to measure the efficacy of different tooth-brushing methods for removing plaque in Korea. METHODS: This study was conducted with the approval of the Institutional Review Board (IRB) of the Seoul National University School of Dentistry (S-D20180021). Thirty participants aged between 19 and 30 years, who did not have periodontal disease, were enrolled in this observational study. Participants were given the same type of toothbrush and toothpaste and asked to brush their teeth as they usually would. During brushing, participants were recorded with a camcorder that was attached to a mirror. Participants were aware they were being recorded. After they had finished brushing their teeth, a dental plaque staining and oral plaque index (PI) examination was performed. The PI score was measured using the Turesky modified Quigley Hein Index. Brushing methods were classified as rolling, horizontal, vertical, circling, and oblique. Skipped surfaces were recorded separately. Following this, statistical analysis was performed using SPSS software. RESULTS: Most surfaces of the mouth were skipped. The most commonly used brushing method was the circling method, followed by the vertical, horizontal, rolling, and oblique methods. The most frequently used method on the vestibular surface was circling, with 52.92% of the oral surface skipped. The oblique brushing method had the lowest mean PI score with a mean±SD of 1.73±0.82. The mean PI score of the skipped surfaces was the highest with a mean±SD of 2.52±0.81. We also analyzed the linear mixed model considering the different lengths of time spent brushing. Both the brushing method used and the time spent brushing had a significant effect on the PI score, but no interactions between these were observed. In areas where a horizontal brushing method had been used, the PI score was significantly decreased. CONCLUSIONS: This study suggests that the horizontal brushing method is an efficient tooth-brushing method compared to the other methods. Additionally, tooth-brushing for more than 10 seconds on 3 to 4 teeth area was effective in removing dental biofilm.
Biofilms ; Dental Plaque Index ; Dental Plaque ; Dentistry ; Ethics Committees, Research ; Humans ; Korea ; Methods ; Mouth ; Observational Study ; Oral Hygiene ; Periodontal Diseases ; Seoul ; Tooth ; Toothpastes ; Video Recording

PURPOSE: This study develop a Video Recording-Based Standardized Handoff (VRSH) program at shift change for ward nurses.METHOD: The study was conducted in five medical, three surgical, and one comprehensive nursing care service wards affiliated with a secondary general hospital. In this methodological study, the VRSH program was developed between April and December, 2017. It is noted that 65 nurses who were involved in the VRSH program participated in this study.RESULTS: In line with the modified Situation, Background, Assessment, Recommendation tool, the VRSH program consisted of three phases. In the VRSH program, the average time for handoff duration was 3–5 minutes per patient. More than 90% of the ward nurses were satisfied with the VRSH program since it benefited them by reducing overtime work and improving the performance, as well as effective communication, of nurses. The content analysis of nurses' VRSH program experience, revealed three categories and eight sub-categories.CONCLUSION: This study provides evidence that the VRSH program improves effective nursing performance and, the handoff communication and relationships between nurses. Future studies on large sample sizes and multiple settings are required to substantially evaluate the impact of the VRSH program on clinical outcomes.
Feasibility Studies ; Hospitals, General ; Humans ; Methods ; Nursing ; Nursing Care ; Patient Handoff ; Pilot Projects ; Sample Size ; Video Recording

PURPOSE: The purpose of this study was to develop a model for handoff education for nursing students based on simulation using video and to identify educational effects of a simulated situation in pediatric care units. METHODS: Data were collected from May 1 to 30, 2016. Participants were 84 senior nursing students in Seoul(video group: 43, simulation group: 41). Both groups were given a lecture and pre-briefing on handoff education. The simulation group had nursing practice on resolving health issues for respiratory distress using a high-fidelity baby simulator. The video group watched a video recording of a scenario based simulation, and used a summarized handoff situation to practice patient handoff to another student. RESULTS: There was no significant difference between the two groups for handoff self-confidence, problem solving ability, handoff competence(self-assessment of students), or learning satisfaction. Self-confidence increased significantly in both groups. Handoff competency evaluated by the instructor was higher in the video group compared to the simulation group(t=2.33, p=.022). CONCLUSION: Nursing student education for handoff practice utilizing a video in the pediatric unit was more cost effective. Therefore, it could be a useful educational method for students in learning patient handoff practices and helpful for related research.
Clinical Competence ; Education ; Humans ; Learning ; Methods ; Nursing ; Patient Handoff ; Patient Simulation ; Pediatric Nursing ; Problem Solving ; Students, Nursing ; Video Recording

Systemic sclerosis is a connective tissue disease characterized by alterations in microvascular structure and function. In these patients, numerous studies have demonstrated a relationship between capillary morphology and peripheral blood perfusion. Nailfold videocapillaroscopy reveals the peripheral microvascular morphology and thus allows classification and scoring of capillary abnormalities with respect to different microangiopathy patterns (early, active, and late). Laser Doppler flowmetry and laser speckle contrast analysis can be used to estimate cutaneous blood flow through microvessels and to assess and quantify blood perfusion at peripheral sites. These two methods are also used to identify changes in digital blood perfusion after the infusion of vasodilators.
Blood Flow Velocity ; Humans ; *Laser-Doppler Flowmetry ; *Microcirculation ; Microscopic Angioscopy/*methods ; Microvessels/*pathology/*physiopathology ; Nails ; Predictive Value of Tests ; Regional Blood Flow ; Scleroderma, Systemic/*diagnosis/pathology/physiopathology ; Skin/*blood supply ; Vasodilator Agents/diagnostic use ; *Video Recording

BACKGROUND/AIMS: Currently, the videofluoroscopic swallowing study (VFSS) is the standard tool for evaluating dysphagia. We evaluated whether the addition of endoscopist-directed flexible endoscopic evaluation of swallowing (FEES) to VFSS could improve the detection rates of penetration, aspiration, and pharyngeal residue, compared the diagnostic efficacy between VFSS and endoscopist-directed FEES and assessed the adverse events of the FEES. METHODS: In single tertiary referral center, a retrospective analysis of prospectively collected data was conducted. Fifty consecutive patients suspected of oropharyngeal dysphagia were enrolled in this study between January 2012 and July 2012. RESULTS: The agreement in the detection of penetration and aspiration between VFSS and FEES of viscous food (kappa=0.34; 95% confidence interval [CI], 0.15 to 0.53) and liquid food (kappa=0.22; 95% CI, 0.02 to 0.42) was "fair." The agreement in the detection of pharyngeal residue between the two tests was "substantial" with viscous food (kappa=0.63; 95% CI, 0.41 to 0.94) and "fair" with liquid food (kappa=0.37; 95% CI, 0.10 to 0.63). Adding FEES to VFSS significantly increased the detection rates of penetration, aspiration, and pharyngeal residue. No severe adverse events were noted during FEES, except for two cases of epistaxis, which stopped spontaneously without requiring any packing. CONCLUSIONS: This study demonstrated that the addition of endoscopist-directed FEES to VFSS increased the detection rates of penetration, aspiration, and pharyngeal residue.
Aged ; Deglutition/*physiology ; Deglutition Disorders/*diagnosis/radiography ; Female ; Fluoroscopy/methods ; Humans ; Laryngoscopy/*methods/statistics & numerical data ; Male ; Middle Aged ; *Pharynx/radiography ; Reproducibility of Results ; Retrospective Studies ; Video Recording

PURPOSE: The purpose of this study is to determine the educational suitability of the video-laryngoscope in teaching endotracheal intubation to students. METHODS: Medical students participated in a course on the use of a Macintosh direct laryngoscope and McGrath MAC videolaryngoscope for intubation. The course comprised a 1-hour lecture and 30 minutes of practice on a manikin. After the course, in each of the three simulated patient scenarios-normal airway, cervical spine fixation, and tongue edema-time to intubate, success rate, and chance of complications were measured. A questionnaire was administered before and after the course to determine the suitability of intubation by video-laryngoscope for a medical education course. Also, changes in the perception and stance on the video-laryngoscope were evaluated. RESULTS: Time to intubate decreased as attempts were repeated. The first-attempt success rate in the cervical spine fixation scenario was higher using the video-laryngoscope (p=0.028). Rates if tooth injury were lower in the cervical spine fixation (p=0.005) and tongue edema scenarios (p=0.021) using the video-laryngoscope. Based on the questionnaires, students responded positively with regard to their knowledge of the video-laryngoscope, its practical value, and its suitability for medical education (p<0.001). Also, the preference for the video-laryngoscope was greater (p=0.044). Students felt that repeated attempts and feedback on intubation were helpful. CONCLUSION: The students' evaluations and surveys showed positive results to intubation by video-laryngoscope. Thus, based on its suitability for medical education it is reasonable to consider learning intubation using the video-laryngoscope.
Clinical Competence ; Education, Medical, Undergraduate/*methods ; Humans ; Intubation, Intratracheal/*methods ; Laryngoscopes ; Laryngoscopy/*education/methods ; Manikins ; Surveys and Questionnaires ; Video Recording ; Video-Assisted Surgery/*education/methods

PURPOSE: The purpose of this study was to establish a set of normative data values for saccade movements using videonystagmography and to evaluate the effects of manual correction on this data. METHODS: We examined 25 healthy subjects (9 men and 16 women). All tests were carried out by one well-instructed physician. Errors such as the wrong detection of the inflection point, missing movement, and prediction occurred during some tests. Thus, the same physician manually corrected the data by deleting error data from row results. RESULTS: We established a set of normative data for horizontal saccade movements (amplitude size 15 and 30 degrees) for mean peak velocity, latency, and accuracy. Manual correction only impacted latency and accuracy at 30 degrees horizontal, which is likely related to possible errors during the test. CONCLUSIONS: The present study provides clinically useful videonystagmography-based normative data for clinicians regarding saccade movements in Korean individuals.
Adult ; Female ; Healthy Volunteers ; Humans ; Male ; Oculomotor Muscles/*physiology ; Photic Stimulation ; Reference Values ; Reproducibility of Results ; Saccades/*physiology ; Video Recording/*methods ; Young Adult

Based on the imaging photoplethysmography (iPPG) and blind source separation (BSS) theory the author put forward a method for non-contact heartbeat frequency estimation. Using the recorded video images of the human face in the ambient light with Webcam, we detected the human face through software, separated the detected facial image into three channels RGB components. And then preprocesses i.e. normalization, whitening, etc. were carried out to a certain number of RGB data. After the independent component analysis (ICA)'theory and joint approximate diagonalization of eigenmatrices (JADE) algorithm were applied, we estimated the frequency of heart rate through spectrum analysis. Taking advantage of the consistency of Bland-Altman theory analysis and the commercial Pulse Oximetry Sensor test results, the root mean square error of the algorithm result was calculated as 2. 06 beat/min. It indicated that the algorithm could realize the non-contact measurement of heart rate and lay the foundation for the re- mote and non-contact measurement of multi-parameter physiological measurements.
Algorithms ; Face ; Heart Rate ; Humans ; Monitoring, Physiologic ; methods ; Oximetry ; Photoplethysmography ; Software ; Video Recording