• 한국응급구조학회지
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• 제14권3호
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• pp.71-81
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• 2010

Purpose: To minimize an interruption in chest compression, reduce the hands-off time, the American Heart Association has recommended the ratio of chest compression to ventilation ratio to 30:2 from 2005 CPR guideline to 2010 CPR guideline. However, current studies have shown that the hands-off time was > 10 seconds with that method. For this reason, we devised new CPR method that a ventilation to chest compression ratio of 2:30 to reduce pt assessment time and skipped the assessment step of carotid artery pulse would be a more effective way to reduce the hands-off time & the time to set the CPR. According to the more detailed purpose are listed below. 1) We would like to confirm efficiency of a ventilation to chest compression ratio of 2:30 than a chest compression to ventilation ratio of 30:2 to reduce the hands-off time & the time to set the CPR. 2) We would like to evaluate possibility of increasing for chest compression accuracy of a ventilation to chest compression ratio of 2:30 than a chest compression to ventilation ratio of 30:2 3) We would like to evaluate possibility of increasing for ventilation accuracy of a ventilation to chest compression ratio of 2:30 than a chest compression to ventilation ratio of 30:2 Methods: According to 2005 American Heart Association Guidelines, 60 paramedic students(20 students X freshmen, sophomore, junior) performed 5 cycles of 3~ chest compressions : 2 ventilations after A, B, C evaluation with Laerdal Resusci R Anne SkillReporters. After 5 minutes rest, the 60 students performed 5 cycles of 2 ventilations : 30 chest compressions after A, B evaluation with the manikins between 13 and 17 September 2010. The short reports including speed & accuracy of chest compression, respiratory, CPR cycle were gained from the manikins. Hands-off times were measured by assistants. Results: Recently, the importance of high quality CPR was emphasized in order to perform the CPR faster and more accurate. To find out improving the conventional CPR method, we switch the procedure of the compression and the ventilation. By switching the procedure back and forth, we are able to compare the effectiveness of CPR between two type of CPR method which are 2:30 and 30:2 methods. 2:30 is that the breaths is delivered twice, first and perform 30 compressions while 30:2 perform 30 compressions first and give 2 breaths followed by the ABC method. Also, we verify the effectiveness of the hands off time, compression accuracy of the compression through the comparison of the two procedure as mentioned earlier. Consequently research verified that 2:30 is the efficient by providing faster set up delivering more accurate chest compression. Conclusion: 2:30 can minimize a time delay from cardiac standstill until starting the chest compression. In addition, hands-off time which is an interruption in chest compression can be shortened by 2:30 method, which result to effective oxygenation of coronary artery & maintenance of the bloodstream. Once again, performing the 2:30 method provide lessen hands off time and increase the accuracy of the chest compression.

• 한국응급구조학회지
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• 제19권3호
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• pp.139-148
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• 2015

Purpose: This study aimed to compare the chest compression quality between compression-only cardiopulmonary resuscitation (CPR) and conventional CPR. Methods: This study involved 123 participants randomly assigned to either the chest compression-only CPR training and conventional CPR training. After training for 120 min, the participants performed CPR for 4 min and the CPR quality was evaluated. The primary outcome was evaluated as the mean compression depth, and the secondary outcome was calculated as the proportion of chest compressions with an appropriate depth among the total chest compressions. Results: The mean compression depth was more deeper in conventional CPR than in compression-only CPR (57mm vs. 53mm, p <.001). The proportion of appropriate chest compression depth was also more higher in conventional CPR (98.8% vs. 68.6%, p <.001). As compared with every minute over time for a total of 4 min, the mean compression depth and the proportion of appropriate chest compression depth were deeper and higher after 1 min in conventional CPR than in compression-only CPR. Conclusion: The results suggested that conventional CPR is a better method than compression-only CPR in terms of chest compression quality.

• 대한의용생체공학회:의공학회지
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• 제31권5호
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• pp.407-411
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• 2010

During the cardiopulmonary resuscitation (CPR), the correct chest compression depth and period are very important to increase the resuscitation possibility. For the feedback of chest compression depth, the depth monitoring device based on the accelerometer is developed and widely used. But this method tends to overestimate the compression depth on the bed. To overcome this limitation, the chest compression depth estimation method using two accelerometers is suggested With the additional accelerometer between the patient and mattress on the bed, the compression of the mattress is also measured and it is used to compensate the overestimation error. The experimental results show that the single accelerometer estimates as 61.4mm for the actual compression depth of 43.6mm on the mattress. The depth estimation with the dual accelerometer was 44.6mm which is close to the actual depth. With the automatic zeroing in every single compression, the integration error for the depth can be reduced. The dual accelerometer method is effective to increase the accuracy of the chest compression depth estimation.

• 한국응급구조학회지
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• 제24권3호
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• pp.107-116
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• 2020

Purpose: We compared three chest compression methods to find an efficient method for performing infant cardiopulmonary resuscitation (CPR) for single rescuers and improving chest compressions quality. Methods: Thirty new marine police trainees at the Korea Coast Guard Education Institute were tested for five sessions using three methods of single rescuer infant CPR: two-finger chest compression, two-thumb encircling chest compression, and two-finger support chest compression. Results: The depth, accuracy, and number of compressions per minute of resuscitation were analyzed for the above three methods. The depth of two-finger chest compression, two-thumb encircling chest compression, and two-finger support chest compression was 3.53±0.20cm, 4.10±0.13cm, and 4.22±0.15cm, respectively. Accuracy was 23.86±12.59%, 54.11±10.8%, 71.55±18.81%, respectively, while the time for one cycle of 30 chest compression was 16.01±10.5 seconds, 16.45±0.85 seconds, and 16.56±0.91 seconds, respectively. Chest compression interruptions were 6.59±0.78 seconds, 7.17±0.37 seconds, and 6.97±0.35 seconds, respectively. The interruptions were consistent with the range of 5-10 seconds suggested by the American Heart Association. Conclusion: When one rescuer performs CPR for an infant in cardiac arrest, a comparative analysis of three methods showed that two-thumb encircling chest compression is the best for accuracy and efficiency of chest compressions.

• 한국컴퓨터정보학회논문지
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• 제24권11호
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• pp.179-185
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• 2019

이 연구는 심폐소생술 중 거울을 활용한 시각적 효과를 이용했을 때 가슴압박의 질을 비교함으로써, 좀 더 나은 물리적 요소를 제공하여 효과적인 심폐소생술을 할 수 있도록 하는데 기초자료를 제공하고자 시행 되었다. 무작위 교차방법(Randomized Crossover Design)에 의한 실험 연구로 BLS Health Care-Provider 자격을 이수한 28명을 대상으로 가슴압박 시행 시 깊이, 속도, 압박 대이완의 비율, 팔의 각도, 용이성 등을 측정하였다. 수집된 자료는 SPSS Ver. 23.0 for Win 통계프로그램을 이용하여 분석하였다. 본 연구의 결과를 종합해 보면 심폐소생술에서 가슴압박 시행 시 거울을 활용한 가슴압박 방법을 이용한다면 효율적인 가슴압박을 할 수 있었고, 가슴압박의 평균 깊이, 압박 대 이완 비율, 팔의 각도, 구조자의 자세가 나아져 가슴압박의 질적 지표가 향상되었음을 알 수 있었다. 하지만 거울을 활용한 가슴압박 방법에 대해 다양한 환경요소 및 직군에 대하여 추가적인 연구를 통해 임상적 활용의 가능성을 확인하는 것이 필요 할 것이다.

• 한국정보통신학회논문지
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• 제26권9호
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• pp.1392-1398
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• 2022

이 연구는 소아 심폐소생술 중 새로운 가슴압박 방법을 활용했을 때, 가슴압박의 질을 비교하여 효과적인 심폐소생술을 할 수 있도록 하고자 시행되었다. 무작위 교차방법(Randomized Crossover Design)에 의한 실험 연구로 BLS Health Care-Provider 자격을 이수한 28명의 응급구조사를 대상으로 가슴압박 시행 시 깊이, 속도, 압박 대 이완의 비율, 용이성, 안정감 등을 측정하였다. 수집된 자료는 SPSS Ver. 23.0 for Win 통계프로그램을 이용하여 분석하였다. 본 연구의 결과 를 종합해 보면, 소아 심폐소생술에서 가슴압박 시행 시 새로운 가슴압박법을 이용한다면 가슴압박의 질적 지표가 향상되었음을 알 수 있었다. 기존의 방법을 고수하는 것도 좋지만 새로운 가슴압박 방법을 통해 다양한 연령대와 환경요소에 대한 추가적인 연구를 바탕으로 임상적 활용의 가능성을 확인하는 것이 필요할 것이다.

• 한국컴퓨터정보학회논문지
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• 제23권10호
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• pp.151-156
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• 2018

The purpose of this study was to find more effective method through comparison of manual chest compression and chest compression using $AutoPulse^{TM}$ device in pre-hospital simulation cardiac arrest. In order to achieve the purpose of the study, ambulance workers did two different style CPR in pre-hospital simulation cardiac arrest. Data analyzed by T test and ANOVA. Findings of this study are as follows. Firstly, manual chest compression is more effective than chest compression using $AutoPulse^{TM}$ device on scene. Secondly, chest compression using $AutoPulse^{TM}$ device is more effective manual chest compression in ambulance and in elevator. In conclusion, these findings provide strong evidence for the importance of hands off time and stable CPR before hospital arrival in explaining patient's prognosis. Therefore, strategies to conduct precise hands off time and stable CPR are needed to improve patient's prognosis.

• 한국응급구조학회지
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• 제22권3호
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• pp.67-76
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• 2018

Purpose: The purpose of this study was to evaluate the quality of chest compressions and ventilation when using an mechanical device(LUCAS) and 2-men manual cardiopulmonary resuscitation(CPR) performed on a minikin, as well as to propose a more effective CPR method during transit. Methods: Data were collected by LUCAS and manual virtual reality based ambulance simulation. Analysis was performed using SPSS software 12.0. The average and standard deviation of chest compression depth and ventilation were analyzed using descriptive statistics and t-test. Results: In the virtual reality based LUCAS and manual CPR results, LUCAS showed better chest compression and lower incomplete chest release than manual CPR. During CPR with a chest compression-ventilation ratio of 30:2 in virtual reality ventilation with bag-valve mask was able to deliver an adequate volume of breathing. Conclusion: It is suggested that rescuers on ambulance may consider using LUCAS as an alternative to high-quality chest compression during transit.

• 한국컴퓨터정보학회논문지
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• 제25권3호
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• pp.169-176
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• 2020

본 연구는 이송 중 심장정지 환자에게 가슴압박의 질을 높일 수 있는 방법을 제안하였다. 병원 전 단계에서 심장정지 환자에게 심폐소생술을 제공 할 때 구급차에 고정되어 있는 3점식 벨트를 사용하여 가슴압박의 질을 높일 수 있다. 119구급대원이 가슴압박 방법과 더불어 3점식 고정벨트를 착용한 경우 가슴압박의 질이 더 높아졌다. 또한 구급대원의 위험에 노출될 가능성도 적어졌다. 따라서 이송 중 구급차 안에서 3점식 고정벨트를 착용한 경우 119 구급대원은 안전을 확보할 수 있게 되고 심장정지 환자에게는 고품질의 가슴압박을 제공 할 수 있다.

• 한국운동역학회지
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• 제31권3호
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• pp.220-225
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• 2021

Objective: The purpose of this study was to investigate the effect of levels of education on ground reaction force and center of pressure parameters during chest compression resuscitation. Method: Twenty male university students were divided into two groups; certified group (CG, n=10) and non-certified group (NCG, n=10). Two force plates were used to measure ground reaction force and center of pressure parameters during 30 times (three trials) chest compression resuscitation. Independent t-tests were used to compare ground reaction force and center of pressure parameters between two groups. An alpha level of 0.05 was used in all tests. Results: All chest-compression time parameters (total time, 1 systolic time, and diastolic time) in CG were significantly shorter than those in NCG (p<.05). Fy of the diastolic and Fz of the systolic in CG revealed significantly the larger GRF values and Fy of the systolic in CG showed significantly the smaller GRF value (p<.05). The standard deviation of Fz of the systolic and diastolic within the subject during 30 times chest-compression resuscitation revealed significantly the smaller values in CG (p<.05). Conclusion: First, CG performed chest compressions efficiently at an appropriate rate compared to NCG. Second, CG showed lower Fx and Fy values in both the mediolateral and anteroposterior axes compared to NCG, which reduced unnecessary chest-compression force consumption and minimized the movement in patients with cardiac arrest. Third, CG showed high Fz value of the systolic and low Fz value of the diastolic. Based on this, chest compression resuscitation was performed to increase the survival rate of cardiac arrest patients.