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대한응급의학회지제 20 권제 6 호 Volume 20, Number 6, December, 2009 원 저 DVD 시청또는강사주도학습에이은자가실습직후획득된심폐소생술수행능력에강사추가개입이미치는영향 동아대학교의과대학응급의학교실, 광주보건대학응급구조과 1 이원석 박대성 1 하원선 최용준 정준영 윤영현 Effects of Additional Instructor s Intervention on CPR Performance Immediately after DVD-based or Instructor-led Instruction Won Suk Lee, M.D., Dae Sung Park, Ph.D. 1, Won Sun Ha, M.D., Yong Jun Choi, M.D., Jun Young Chung, M.D., Young Hyun Yun, M.D. education significantly increased with instructor s participation and the difference between teaching methods was insignificant. Key Words: Cardiopulmonary resuscitation, Teaching, Educational measurement Department of Emergency Medicine, Dong-A University college of Medicine, Busan, Korea, Department of EMT, Purpose: Effective training in CPR is important for medical personnel and the public and a variety of educational methods have been used. We compared the results of the two most common CPR teaching methods, video-based and Instructorled teaching, with particular emphasis on the effects of supervised practice by an instructor. Methods: Sixty college students who had never been taught CPR were divided into 2 groups of 30. One group was given a 30-minute lecture using slides and the other watched the 30-minute CPR Anytime DVD. Afterwards, all participants were tested on the Mini Anne manikin. All students were re-tested after 30 minutes of practice under the supervision of an instructor. Results: The only statistically significant difference between the two groups was an increased accuracy in breath delivery in the DVD group before the instructor supervised practice. There were no statistically significant differences between the 2 groups after the instructor supervised practice. Conclusion: Self practice via DVD was relatively more effective than the theory lecture. However, the effect of the 책임저자 : 윤영현부산광역시서구동대신동 3가 1 동아대학교의과대학응급의학교실 Tel: 051) 240-2941, Fax: 051) 240-5903 E-mail: epyun@dau.ac.kr * 동아대학교연구비의지원에의하여수행된논문임. 접수일 : 2009년 1월 2일, 1차교정일 : 2009년 2월 6일게재승인일 : 2009년 9월 25일 615 Kwangju College of Health Sciences, Kwangju, Korea 1 서 심정지가발생했을경우에발견즉시목격자에의한즉각적이고정확한심폐소생술 (bystander CPR) 이효과적이다. Ritter 등 1) 은심폐소생술이시행된경우 11.9% 의생존율을, 시행되지아니한경우에는단지 4.7% 의생존율을보고하였다. Thomson 등 2) 의연구에서는심폐소생술이시행된경우에는 43% 이었고, 그렇지않은경우에는 21% 로조사되었다. 생존율을높이는데중요한요인은심폐소생술의시작시간과정확도이다. Lund 와 Skulberg 등 3) 의연구에서일반인에의한심폐소생술이실시된군에서효과적인심폐소생술이시행된경우는 96% 가생존했지만, 심폐소생술을시행했다하더라도효과적이지않을때는생존율이 4% 에불과해서큰차이가있음을보고하였다. 압박깊이, 압박시간, 압박횟수등이불충분한경우에는생존율이대단히낮았다. 따라서표준화된기본심폐소생술을학교, 관공서, 공공기관등에서교육하여전체인구가유년기부터생명을살리는법을적극적으로배우도록하는것이중요하며, 일반인에게조금더효과적으로교육을하는여러방법이소개되고있다. 비디오나 DVD 등여러영상매체를이용하여자가교육하거나또는다수의교육생을대상으로강의실에서강사의이론강의위주의교육을한후각자실습을하는것이대표적인교육방법이다. 영상매체와강사위주의교육방법에따른효과만을비교하는여러연구가있어왔지만실제 론

616 / 대한응급의학회지 : 제 20 권제 6 호 2009 각각의교육후에강사의개입이수행능력에어느정도영향을미치는지에관한연구는없었다. 이에본저자는 DVD를통해, 혹은슬라이드및강의로교육받은각각의학생들의심폐소생술수행을비교하였고, 이후에강사의개입으로인한교육의효과를알아봄으로써 DVD를이용한자가교육과이론강의위주의심폐소생술교육중에효과적인방법이무엇이고, 이후에강사의개입으로교육의효과가어느정도좋아지는지를알아보고자하였다. 대상및방법이실험은 2008년 5월 16일부터 5월 28일까지실시되었으며이전에심폐소생술교육을받은경험이전혀없는대학생을대상으로대학교의게시판의광고를통해선착순으로 60명을모집하였다. 60명을무작위로각 30명씩 2그룹으로나누어한그룹은 DVD를통해, 다른그룹은슬라이드를이용한강사의강의를받았다. DVD 교육그룹은 CPR Anytime TM kit (Laerdal Medical Corporation, Stavanger, Norway) 을사용하였다. 30분간 CPR Anytime DVD를시청한후, 학생개인별로지급된마네킹 (Little Anne, Laerdal, Norway) 으로 5분간혼자서연습을하였다. 슬라이드강의그룹은강사가학생들에게 30분간심폐소생술의이론을슬라이드를통해강의를하였고, 마찬가지로개인별로지급된마네킹으로 5분간혼자서연 습을하였다. 이후두그룹의심폐소생술수행능력을평가하였다. 이그룹들에게대한심폐소생협회주관의교육장에서강사코스를이수하고자격을부여받은강사가각그룹에대해실제적인심폐소생술시범을보인뒤 30분동안강사 1인당 6명의학생들의연습을관찰하면서흉부압박과인공호흡의자세및압박위치등을수정하였으며, 모니터가가능한교육용마네킹 (Resusci Anne with Skillreporter TM, Laerdal, Norway) 의결과를가지고되먹임을실시하였다. 각학생들은 5분간스스로연습을한뒤다시평가를받았다 (Fig. 1). 실험방법은두학생이조를만들고각조가 30회의흉부압박, 페이스실드를덮고구강대구강호흡방법으로 2회의인공호흡을 1주기로하여 5주기후각학생의역할을즉시바꾸어총 10주기를실시하였다. 평가는흉부압박의횟수, 흉부압박의정확도 ( 회 ), 흉부압박의정확도 (%), 흉부압박의분당횟수 ( 회 / 분 ), 흉부압박평균깊이, 평균환기량, 총호흡횟수, 인공호흡정확도 ( 회 ), 인공호흡정확도 (%) 를평가하고이를마네킹에연결되어있는프린터로출력하여분석하였다. 인공호흡의정확도는호흡량 (400~500 ml), 정확하게인공호흡시킨횟수및퍼센트를토대로산출되었다. 출력된자료는각그룹에서심폐소생술수행을평가하기위해사용되었다. 모니터가가능한마네킹을보조교육재료로이용하였다. 모아진자료는통계프로그램인 SPSS 14.0을이용하여 Fig. 1. A flow-chart of case distribution and CPR training sequence.

이원석외 : DVD 시청또는강사주도학습에이은자가실습직후획득된심폐소생술수행능력에강사추가개입이미치는영향 / 617 분석하였다. 두그룹간의비교와강사의지도직전, 직후의비교에는각각 paired t-test를이용하였다. 심폐소생술의수행은앞서언급된항목을사용하여평가하였다. 저자들은각각의경우에서적절한압박-환기비율이이루어지는정도를퍼센트를사용하여나타내었고 chi-square test를이용하여분석하였다. p<0.05경우통계학적으로의의있는것으로판단하였다. 결과본연구에참가한대상자는총 60명으로, DVD 교육그룹은남자가 15명, 여자가 15명으로구성되었으며, 평균나이는 20.6±2.0세였다. 슬라이드강의그룹은남자가 14명여자가 16명으로, 평균나이는 20.7±1.9세였다. 1. DVD 교육그룹과슬라이드강의그룹의심폐소생술정확도 (Table 1) 정확도에서는인공호흡에서만통계적으로의미있는차이가있었다. DVD 교육그룹에서는 24.1% 인데반해슬라이드강의그룹은 9.7% 이었다. 2. 슬라이드교육그룹에대한강사의추가교정전과후의심폐소생술결과비교 (Table 1) 전반적으로, 강사의교정후흉부압박의평균정확도는향상되었다 (44.2% vs 77.8%). 또한흉부압박의평균깊이 (37.0 mm vs 40.9 mm) 및 20 주기중호흡수 (9.5회 vs 15.1회 ) 의통계적으로의미있는증가를보였다. Table 1. Accuracy of Skill in each group Compression Variables Before After instructor s (unit) instructor s remedy remedy DVD Slide lecture p DVD Slide lecture p The number of thoracic compression (300 times) 253.2±138.4 271.6±148.7 0.62 275.7±124.7 255.1±150.7 0.57 The accuracy of thoracic 035.0±23.20 44.2±28.4 0.17 078.1±22.3* 77.8±21.8 0.97 compression (%) The average number of thoracic 187.6±660.4 106.3±175.5 0.51 228.0±674.7 369.6±926.1 0.50 compression (times) The numbers of thoracic compression per minute 098.9±10.5 96.6±9.90 0.38 96.1±8.70 92.6±6.10 0.07 (100 times/min) The average depth of 36.6±4.40 37.0±5.50 0.71 41.8±3.7* 040.9±3.5 0.34 thoracic compression (mm) Ventilation The average amount of 655.0±358.3 558.0±444.0 0.35 760.3±225.6 668.0±248.3 0.14 breathing (ml) The average amount of 2370.4±1519.5 2278.9±3559.2 0.89 3921.3±4808.3 3559.2±7295.0 0.47 breathing per minute (ml) The total numbers of 12.0±7.20 9.5±8.4 0.23 15.9±7.2* 15.1±8.6 0.69 breathing (20 times) The accuracy of 024.1±20.5 09.7±16.1 0.00 19.4±2.90 14.1±13.1 0.17 breathing (%) C:V ratio Accuracy (%) 17 (56.7) 7 (23.3) 19 (63.3) 13 (43.3) * p< 0.05 compared with DVD group before instructor s remedy p< 0.05 compared with lecture group before instructor s remedy p< 0.05 compared DVD group before instructor s remedy to lecture group after instructor s remedy C:V ratio: compression:ventilation ratio

618 / 대한응급의학회지 : 제 20 권제 6 호 2009 3. DVD 교육그룹에대한강사의추가교정전과후의심폐소생술결과비교 (Table 1) 강사의추가교정후, 정확도는흉부압박의정확도 (35.0% vs 78.1%), 흉부압박의평균깊이 (36.6 mm vs 41.8 mm), 20 주기의심폐소생술중호흡수 (12회 vs 15.9회 ) 가통계적으로의미있는정도로증가하였다. 4. DVD 교육그룹과강사의교정을거친슬라이드강의그룹의결과비교 (Table 1) 정확도에서는흉부압박의정확도와흉부압박깊이가각각 DVD 교육그룹에서 35.0%, 36.6 mm이었고강사의교정을거친슬라이드강의그룹에서 77.8%, 40.9 mm로강사의교정을거친슬라이드강의그룹에서더정확한것으로통계적으로차이를보였다. 분당흉부압박횟수와인공호흡의정확도는각각 DVD 교육그룹과강사의교정을거친슬라이드강의그룹 (98.9회 vs 92.6회, 24.1% vs 14.1%)) 에서통계적으로차이가있었다. 5. 두그룹에서강사의교정을거친뒤의결과비교 (Table 1) 강사의교정을거친 DVD 교육그룹및슬라이드강의그룹의심폐소생술결과간에는통계적으로의미있는차이가없었다. 6. 흉부압박과환기의비율 (Table 1) 정확한흉부압박과환기의비율은학생들개개인마다큰차이를보였다. 대신에본저자들은 AHA의 2005년가이드라인에맞게 30:2로시행한학생의비율을확인하였다. DVD 교육그룹과슬라이드강의그룹에서강사의개입전의결과 (56.7% vs 23.3%) 보다강사의개입후의결과 (63.3% vs 43.3%) 가정확한흉부압박과환기의비율로심폐소생술을시행한학생의비율이높아졌다. 고 20년이넘게기본심폐소생술교육방법을향상시키기위해지속적인노력을해왔다. 더욱효과적인교육과습득을위해미국심장협회에서는기본심폐소생술교육효과의향상을위한평가의목적 7가지를발표하였다. 첫째, 학생들이지속적학습에대한필요성을인지하도록돕는다. 둘째, 강사로하여금어떤학생이도움이필요하고, 어느부분을도와주어야하는지인지하도록돕는다. 셋째, 강사로 찰 하여금그들의교육내용, 시간활용, 교수법, 기본적이해를증진시킬수있는주제및기술을발견할수있도록돕는다. 넷째, 교육과정책임자 (Course director) 로하여금과정내에개선이필요한부분을발견하도록해주고, 교육과정의전반적성공여부를평가할수있게돕는다. 다섯째, 지역교육프로그램과상위교육체계의연계를통해교육과정의질향상을돕는다. 여섯째, 지역교육프로그램과상위교육체계의교육목적및결과를같게유지하도록돕는다. 일곱째, 학생들의학습에대한추가적인동기부여를돕는다 4). 이러한원칙들은교수법의다양성을요구하며, 정보관련학문의발전에많은영향을주어왔다. Plank와 Steinke 등 5) 은전통적교육방식과비디오를통한교육방식의효과를비교하였다. 전통적방식은강사에의한강의-시범-실습의형태로, 90분간의강의와 30분간의실습으로이루어져있다. 비디오교육은강사에의해수행되지않았다. 우리의연구에서는 DVD 교육그룹에비해전통적방식과유사한강사의교정을거친슬라이드강의그룹의결과가여러부문에서우수하게나왔지만이들의연구에서는지식의정도는전통적방식으로교육받은그룹이높았으나, 실제술기에는차이가없었다. 다양한연령층의사람들을대상으로한비디오자가학습법을이용한교육에대한연구와, 고등학교학생들을대상으로한컴퓨터기반학습이강사에의해서만이루어지는교육만큼효과적이었다는연구또한우리의연구결과와다를바가없었다 6-9). 또한 DVD기반및강사주도의심폐소생술교육에서도동일한효과가있었다 10). 후자의연구에서는강사주도교육그룹에서는흉부압박이우수하였고, DVD 교육그룹은구조호흡이우수함을보였다. 단, 두그룹에서모두구조호흡의낮은정확도로인해평가에는제한점이되었다. 우리의연구에서는교육후즉시평가를하여학생들의심폐소생술의수행능력을평가하였지만본연구와는달리학습효과를평가하는다른부분, 즉능력의지속성을비교하여교육의효용성을연구한논문도있었다. Friesen과 Stotts 11) 는자가학습그룹을전통적강의-시연그룹과비교하였다. 2주뒤비교시두그룹간의지식과술기에는차이가없었다. 8주뒤에지식은두군에서모두유지되고있던반면, 술기는두군모두유지되지않았다. De Lorenzo 와 Abbott 12) 는전통적교육그룹과성인교육원칙에기반을둔자기학습프로그램을 10주간소화한그룹을비교하였다. 전자의그룹은스스로의심폐소생술수행에관해강사가평가한것보다더높은등급을주어자신감을보인반면, 후자의그룹은강사의평가와비슷한정도로스스로의수행등급을주었다. 지식의정도는자기학습그룹에서통계적으로의미있는정도로높았다. Isbye 등 13) 은자동음성안내마네킨을이용해심폐소생술을학습한그룹과강사

이원석외 : DVD 시청또는강사주도학습에이은자가실습직후획득된심폐소생술수행능력에강사추가개입이미치는영향 / 619 주도로교육받은그룹을 3개월후에비교하였고, 강사주도의교육을받은그룹의심폐소생술수행이전자에비해우수하다고보고하였다. 본연구에따르면강사의교정이없다면이론강의나영상매체를통하여실습을하는것에서큰차이가없으며순수한교육의효과만을고려해서심폐소생술을교육해야한다면전통적인강사의강의또는영상매체를이용한강의방법에관계없이강사의추가적인교정이있어야만정확하게교육내용을전달할수있었다. 결국매스컴이나영상매체를통하여심폐소생술교육을하는것이대중에게널리그리고쉽게보급되어질수있고, 비용-효과적인측면에서도우월하겠지만, 강사에의해이론교육및실습교육을병행하게된다면즉시잘못된행위를교정할수있으며, 질문등을통하여피드백이되어정확한심폐소생술을익히게되므로, 일반인이나대중을상대로교육을하기위해서는매스컴이나영상매체를통해교육을하는것이좋은방법이되고, 실제로구조행위를자주시행해야되는구조대를포함한의료인의교육에서는강사에의해심폐소생술을교육하는것이좋겠다. 본연구의제한점으로는모집단의수가적고, 참가자들이다양한연령대가아닌젊은성인으로만구성되었다는점이다. 또한의식확인, 도움요청과자동제세동기의이용등심폐소생술에필요한다른항목들이검사되지않았으며, 실험대상각자의교육참가동기부여정도와성실성등이결과에혼란을가져올수있다. 앞으로의연구에서는훨씬더넓은폭의연령대의참가및교육효과의지속성에대한평가, 동기부여정도및기존의성취도가교육에미치는영향까지연구될수있겠다. 결론 DVD 교육그룹및슬라이드강의를통한이론교육그룹에대한평가에서는 DVD 교육그룹이몇몇항목에서효과적이었다. 강사에의한교정을거치면두그룹모두에서심폐소생술수행시의미있는향상을보였으나, 일단강사의개입으로실습교정을받게되면 DVD 교육그룹과슬라이드강의그룹간의심폐소생술수행능력에는별다른차이가없었다. 참고문헌 01. Ritter G, Wolfe RA, Goldstein S, Landis JR, Vasu CM, Acheson A, et al. The effect of bystander CPR on survival of out-of-hospital cardiac arrest victims. Am Heart J 1985;110:932-7. 02. Thompson RG, Hallstrom AP, Cobb LA. Bystander-initiated cardiopulmonary resuscitation in the management of ventricular fibrillation. Ann Intern Med 1979;90:737-40. 03. Lund I, Skulberg A. Cardiopulmonary resuscitation by lay people. Lancet 1976;2:702-4. 04. Guidelines 2000 for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care. The American Heart Association in collaboration with the International Liaison Committee on Resuscitation. Circulation 2000 ;102 (8 Suppl):I-9. 05. Plank CH, Steinke KR. Effect of two teaching methods on CPR retention. J Nurs Staff Dev 1989;5:145-7. 06. Done ML, Parr M. Teaching basic life support skills using self-directed learning, a self-instructional video, access to practice manikins and learning in pairs. Resuscitation 2002;52:287-91. 07. Lynch B, Einspruch EL, Nichol G, Becker LB, Aufderheide TP, Idris A. Effectiveness of a 30-min CPR self-instruction program for lay responders: a controlled randomized study. Resuscitation 2005;67:31-43. 08. Einspruch EL, Lynch B, Aufderheide TP, Nichol G, Becker L. Retention of CPR skills learned in a traditional AHA Heartsaver course versus 30-min video self-training: a controlled randomized study. Resuscitation 2007;74:476-86. 09. Reder S, Cummings P, Quan L. Comparison of three instructional methods for teaching cardiopulmonary resuscitation and use of an automatic external defibrillator to high school students. Resuscitation 2006;69:443-53. 10. Thorén AB, Axelsson AB, Herlitz J. DVD-based or instructor-led CPR education - a comparison. Resuscitation 2007;72:333-4. 11. Friesen L, Stotts NA. Retention of Basic Cardiac Life Support content: the effect of two teaching methods. J Nurs Educ 1984;23:184-91. 12. De Lorenzo RA, Abbott CA. Effectiveness of an adultlearning, self-directed model compared with traditional lecture-based teaching methods in out-of-hospital training. Acad Emerg Med 2004;11:33-7. 13. Isbye DL, Høiby P, Rasmussen MB, Sommer J, Lippert FK, Ringsted C, et al. Voice advisory manikin versus instructor facilitated training in cardiopulmonary resuscitation. Resuscitation 2008;79:73-81.