OBJECTIVE: To investigate whether the accuracy of 3D laser scanning is influenced by the angles and number of scans. METHODS: Using a 3D laser scanner, 10 manikins with facial markers were scanned at 7 horizontal angles (front view and at 20degrees, 45degrees, and 60degrees angles on the right and left sides). Three-dimensional facial images were reconstructed by 6 methods differing in the number and angles of scans, and measurements of these images were compared to the physical measurements from the manikins. RESULTS: The laser scan images were magnified by 0.14 - 0.26%. For images reconstructed by merging 2 scans, excluding the front view; and by merging 3 scans, including the front view and scans obtained at 20degrees on both sides; several measurements were significantly different than the physical measurements. However, for images reconstructed by merging 3 scans, including the front view; and 5 scans, including the front view and scans obtained at 20degrees and 60degrees on both sides; only 1 measurement was significantly different. CONCLUSIONS: These results suggest that the number and angle of scans influence the accuracy of 3D laser scanning. A minimum of 3 scans, including the front view and scans obtained at more than 45degrees on both sides, should be integrated to obtain accurate 3D facial images.
Manikins

Anthropometry ; Head ; Manikins

Three combinations of cloths were evaluated for the protective effects of different kinds of clothings in cold environments. Table 1 shows tile components of tile three models of clothings. A prototype was made by putting a sheet of vinyl at the middle layer of raw cotton in a fabric-quilt cloths. A glove mannequin was covered by each of these cloths. The globes contained 1,000 cc of hot water about 40 degrees C. Tele-thermisters were fixed in order to check the temperature of cloths space and water temperature for evaluation of caloric-loss and climate of clothings. Results are summarized as follows : 1) Without wind, there is no significant difference of air temperatures between ski-parka and quilt wear clothing. 2) The prototype with vinyl sheet best protects against wind, the next is the ski-parka. Quilt-wear protects the least. 3) It is well-known that a working-clothing needs not have any separate liners nor outers. 4) For innermost layer of a clothing preventing cold, a cotton-fabrics is recommended and a water-proof cloths for outer layer. 5) Heat-loss was calculated from the cooling degrees of water. Calorie-loss was 910ca1/m2/hr. when bared, but with the prototype of vinyl sheets the calorie-loss was 350cal/m2/hr. (38.5% of bared). Quilt-wear and ski-parka were 380(41.8%) and 440 cal/m2/hr. (48.4%) respectively.
Climate ; Clothing* ; Manikins ; Water ; Wind*

PURPOSE: The objective of this study is to determine whether application of ventilation in line with compression rate in performance of CPR for cardiac arrest patients was helpful in maintaining an adequate ventilation rate. METHODS: Volunteers who received education on the revised 2010 CPR guidelines were randomly assigned to either a conventional ventilation (CV) group or a compression-adjusted ventilation (CAV) group. During performance of CPR, compression rate and ventilation rate were measured every minute, and the participants' roles were changed every two minutes; CPR was performed for a total of eight minutes. RESULTS: A total of 57 volunteers participated in this study. No statistically significant difference was observed between the compression rate of the CV group and that of the CAV group. However, regarding adequacy of the ventilation rate, greater improvement was observed in the CAV group, compared with the CV group (adequate ventilation: 86.2% vs. 46.4%, p<0.001). In addition, the median value of the ventilation rate was 8.4/min (IQR: 7.7-9.6) in the CV group and 9.5/min (IQR: 9.0-10.0) in the CAV group (p=0.003). CONCLUSION: When no other valid approach is available, use of the CAV method is conducive to maintenance of an adequate ventilation rate.
Cardiopulmonary Resuscitation ; Heart Arrest ; Humans ; Manikins ; Ventilation

PURPOSE: To maintain high quality cardiopulmonary resuscitation (CPR), optimal alternating rescuers is important. Stronger and faster chest compression has recently been emphasized in the 2010 guidelines. Therefore, this study compared and evaluated changes in the quality of chest compression in a 2-min scenario group and a 1-min scenario group. METHODS: Among the 88 participants, two-rescuer pairs were randomly allocated. After the training and a one-day break, participants were asked to perform continuous chest compressions for 2 min on a manikin and to take a one-day break, followed by continuous chest compression for 1 min. In all simulated CPRs, the total number of chest compressions and those with appropriate depth were counted. Chest compression quality index was calculated as the proportion of chest compressions with appropriate depth. RESULTS: The mean overall chest compression depth was lower in the 2-min scenario group, compared with the 1-min scenario group. In particular, compression rate (p=0.110), abnormal hand position (p=0.181), and chest recoil (p=0.892) showed no significant difference between the two groups. However, the quality index, mean depth (p=0.018) and too shallow compression depth (p=0.020) 1-min scenario was better than that of the 2-min scenario group. The difference in the CPR quality index reached statistical significance. CONCLUSION: Switching compressors at an interval of 2 min is reasonable for performance of CPR by a lay-bystander. However, alternating rescuers every 1 min may be an alternative method during continuous chest compression.
Cardiopulmonary Resuscitation ; Fatigue ; Hand ; Manikins ; Thorax

PURPOSE: Inflation of an endotracheal tube cuff with adequate pressure is an important procedure. Passive release technique (PRT) is a useful and convenient method for inflating the cuff. To date, no study comparing this method with minimal occlusive volume technique (MOVT), one of the most commonly used methods for inflating the cuff, has been reported. We conducted this study for comparison of effectiveness, difficulty, and preference between the two methods. METHODS: We conducted a prospective, crossover, randomized study in which participants used each technique, one at a time. Participants inflated the cuff of an endotracheal tube inserted into a manikin after receiving brief education on use of the two methods. After inflating the cuff using each method, pressure and volume of the inflated cuff were measured using a portable manometer and syringes, respectively. Then, difficulty of each method was investigated using the visual analogue scale (VAS) and preference for each method was investigated. RESULTS: A total of 47 participants were enrolled in the study. The mean pressure between the two methods was not statistically different (p=0.27). However, adequate pressure was achieved in 37 (78.7%) and 16 (34.0%) of participants in PRT and MOVT, respectively (p<0.01). The mean volume was 6.0+/-0.4 ml in PRT and 5.7+/-0.6 ml in MOVT (p<0.01). The VAS score for diffculty was 17.7+/-15.8 in PRT and 76.0+/-15.8 in MOVT (p<0.01). Preference for PRT was 46(97.9%) and that for MOVT was 1 (2.1%). CONCLUSION: PRT is an easier, more preferred, and more effective method for cuff inflation than MOVT.
Inflation, Economic ; Intubation ; Manikins ; Prospective Studies ; Syringes

OBJECTIVES: The current study aims to develop Korean Social Affective Visual Stimuli (K-SAVS) to arouse social affect. METHODS: K-SAVS is composed of pictures of social situations among East Asians. Each picture contains a negative, positive, or neutral affect. Positive and negative stimuli were presented to one group of subjects. Negative and neutral stimuli were presented to another group of subjects. All subjects were required to fill out Affective Valence and Arousal Manikin. RESULTS: In the initial test, 18 positive affective stimuli pictures (1 set) and 36 negative affective stimuli pictures (2 sets) were chosen from 95 stimuli pictures. Positive affective stimuli pictures showed higher valence (p < 0.001) and lower arousal (p < 0.001) than negative affective stimuli pictures. In the confirmatory test, 18 neutral stimuli pictures (1 set) were additionally selected out of the total of 79 pictures of neutral stimuli pictures and the pictures used in the former experiment. Neutral stimuli pictures showed higher valence (p < 0.001) and lower arousal (p < 0.001) than negative affective stimuli pictures. CONCLUSION: K-SAVS can be a valid and useful tool for inducing specific social affects of Koreans.
Arousal ; Asian Continental Ancestry Group ; Humans ; Manikins

OBJECTIVE: To compare the effectiveness of the GlideRite stylet with the conventional malleable stylet (CMS) in endotracheal intubation (ETI) by the Macintosh laryngoscope. METHODS: This study is a randomized, crossover, simulation study. Participants performed ETI using both the GlideRite stylet and the CMS in a normal airway model and a tongue edema model (simulated difficult airway resulting in lower percentage of glottic opening [POGO]). RESULTS: In both the normal and tongue edema models, all 36 participants successfully performed ETI with the two stylets on the first attempt. In the normal airway model, there was no difference in time required for ETI (TETI) or in ease of handling between the two stylets. In the tongue edema model, the TETI using the CMS increased as the POGO score decreased (POGO score was negatively correlated with TETI for the CMS, Spearman’s rho=-0.518, P=0.001); this difference was not seen with the GlideRite (rho=-0.208, P=0.224). The TETI was shorter with the GlideRite than with the CMS, however, this difference was not statistically significant (15.1 vs. 18.8 seconds, P=0.385). Ease of handling was superior with the GlideRite compared with the CMS (P=0.006). CONCLUSION: Performance of the GlideRite and the CMS were not different in the normal airway model. However, in the simulated difficult airway model with a low POGO score, the GlideRite performed better than the CMS for direct laryngoscopic intubation.
Edema ; Intubation ; Intubation, Intratracheal* ; Laryngoscopes* ; Manikins* ; Tongue

PURPOSE: The purpose of this study is to compare the modified two-person cardiopulmonary resuscitation method (MM) (the first resuscitator performs chest compressions and squeezes the bag of bag-valve-mask (BVM) during pauses of compression, and the second resuscitator uses two hands to provide an open airway) using the conventional two-person cardiopulmonary resuscitation method (CM). METHODS: This simulation study used a manikin and a cross-over execution design and included 102 participants. After practice of CM and MM, participants were randomly assigned a partner. Each pair of participants performed the 2-CPR for five cycles using both methods alternately at random. All data were recorded in a personal computer and analyzed. RESULTS: Data from 510 cycles each of the CM and MM were analyzed. The MM generated a higher mean tidal volume (TV) (791.2 ml versus 563.8 ml, P<0.001) and more frequent visible chest ventilation (92.1% versus 64.7%, P<0.001). For the inexpert resuscitator group (50; 49%), the MM generated more frequent visible chest ventilation (88.6% versus 34.0%, P<0.001) and ventilation with an adequate TV (43.6% versus 32.0%, P<0.001). No significant difference in compression rate, depth, hand position, and release, and minimal difference of hands off time (0.5s) were observed between the two methods. CONCLUSION: The CM could not easily provide sufficient visible chest rise and might be a poor ventilation option for inexpert BVM resuscitators. The MM can be useful as an alternative method and preferable to the CM for inexpert BVM resuscitators.
Cardiopulmonary Resuscitation* ; Hand ; Manikins ; Microcomputers ; Thorax ; Tidal Volume ; Ventilation*

PURPOSE: The aim of this study is to compare the quality of chest compressions between cardiopulmonary resuscitation (CPR) performed by a single trained rescuer and two rescuer CPR performed by a trained rescuer and an untrained rescuer in a prolonged out-of-hospital CPR scenario. METHODS: For the phase I experiment, thirty-six emergency medical technician students (trained rescuers) were asked to perform 10 minutes of lone rescuer CPR on an instrumented manikin. For the phase II experiment, thirty-six volunteers with no previous CPR training (untrained rescuers) were recruited. Each untrained rescuer was randomly assigned to one trained rescuer. They were asked to perform 10 minutes of two rescuer CPR during the phase II experiment. RESULTS: During phase I, the percent of correct compressions diminished over time. The number of total compressions attempted for 10 minutes was increased significantly in phase II (786+/-50 versus 689+/-50 in phase I, p<0.01). However, the mean percentage of correct compressions for 10 minutes did not show a significant difference between phases (66+/-34% in phase I versus 64+/-22% in phase II). The duration of chest compression interruption was significantly reduced in phase II (3.0+/-0.4 versus 3.5+/-0.5 min in phase I, p<0.01). CONCLUSION: The quality of two rescuer CPR performed by a trained rescuer and an untrained rescuer was comparable to that of lone rescuer CPR performed by a single trained rescuer in a 10-min CPR scenario. When CPR goes on for a prolonged period, changing the person doing the chest compressions to an untrained rescuer may improve the quality of CPR.
Cardiopulmonary Resuscitation ; Emergency Medical Technicians ; Fatigue ; Humans ; Manikins ; Thorax