Journal of Yeungnam Medical Science

Original Articles

Comparison of the Accuracy of the CPR Methods According to Change of the Ratio between Compression and Ventilation : Using a Training Mannikin: Sung Hoon Lee, Sam Beom Lee, Byung Soo Do; Yeungnam Univ J Med. 2007;24(2 Suppl):S544-548. Published online December 31, 2007; DOI: https://doi.org/10.12701/yujm.2007.24.2S.S544

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Abstract PDF: Background
：Newly revised cardiopulmonary resuscitation (CPR) guideline in 2005 recommends 30 chest compressions and 2 rescue breaths during CPR for all rescuers to use for all adult victims. We would compare the accuracy of the CPR methods by revised CPR guideline in 2005 and previous guideline in 2000. Materials and Methods：Fifty medical students during the introduction to clinical medicine (ICM) were investigated after 30 minutes lecture and brief education of CPR methods. Each students performed twice both CPR methods, the one by guideline 2005 (method A), 4 cycles of 30 compressions every 2 breaths, and the other by guideline 2000 (method B), 10 cycles of 15 compressions every 2 breaths. Resci® Anne mannekin and Laerdal® skillmeter were used and paper reports were printed after each tests. After then, we compared the technical accuracy of the results between method A (30:2) and method B (15:2).
Results
：Total fifty students (37 males, 13 females) were tested, their mean age was 25.1, mean body weight was 63.5 kg. The technical accuracy on chest compression was not different between two methods and also the technical accuracy on ventilation was not different between two methods except total ventilation number (p>0.05).
Conclusion
：We could not find significant differences of technical accuracy between both CPR methods. So we don’t think new guideline 2005 is superior to previous guideline 2000 by technical efforts although it’s hemodynamic responses and other clinical benefits is excluded in this study.

Comparative Analysis of Accuracy between Computerized Tomography and Cephalogram for 3-Dimensional Measurement of Maxillofacial Structure.: Jong Su Paek, Jae Chul Song, Hee Kyung Lee; Yeungnam Univ J Med. 2001;18(1):123-137. Published online June 30, 2001; DOI: https://doi.org/10.12701/yujm.2001.18.1.123

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Abstract PDF: BACKGROUND
The purpose of this study is to evaluate the accuracy of measurements obtained from 3-dimensional computerized tomography and 3-dimensional cephalogram constructed by using the frontal and lateral cephalogram of six human dry skulls. MATERIALS AND METHODS: After CT scans and each cephalograms were taken, 3-dimensional coordinates (X, Y, Z) of landmarks were obtained using computer programs. In this study, the accuracy of both methods were determined by means of 14 linear measurements compare with caliper measurements. RESULTS: The standard deviation of landmarks of 3-dimensional CT and 3-dimensional cephalogram were 0.23 mm and 0.30 mm in X axis, 0.27 mm and 0.25 mm in Y axis, and 0.27 mm and 0.31 mm in Z axis. In both methods, the standard deviation were less than 0.5 mm in all landmarks, and the most of landmarks showed less than 1 mm in range. Concerning the accuracy, the mean difference between 3-dimensional CT and manual measurements was 0.33 mm, and 1.13 mm between 3-dimensional cephalogram and manual measurement. The distance between RGo and LGo showed the largest difference (2.23 mm). There were highly significant, and large correlation with manual measurements in both methods (p<0.01). CONCLUSION: It is concluded that closeness of repeated measurements to each skulls reveal the precision of both methods. Computerized tomography and cephalogram for 3-dimensional measurement of maxillofacial structure are equivalent in quality to caliper measurements.

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