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Journal of The Korean Society of Emergency Medicine 2003;14(5): 522-528. |
| Effects of Compression Rate and Compression/Relaxation Ratio on the Hemodynamics of Simultaneous Sterno-Thoracic Cardiopulmonary Resuscitation in the Canine Model of Cardiac Arrest |
| Seo Young Lee, Sung Oh Hwang, Hyun Kim, Yong Soo Jang, Han Joo Choi, Sung Bum Oh, Kyoung Chul Cha, Kang Hyun Lee, Jung Han Yoon, Byung Su Yoo, Seung Hwan Lee, Kyung Hoon Choe |
1Department of Emergency Medicine, Wonju Medical College, Yonsei University, 162 Ilsandong, Wonju, Gangwondo, Korea. shwang@wonju.yonsei.ac.kr
2Department of Internal Medicine, Wonju Medical College, Yonsei University, 162 Ilsandong, Wonju, Gangwondo, Korea. |
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| ABSTRACT |
PURPOSE:
This study was designed to determine the compression rate and the compression/relaxation ratio to produce the optimal hemodynamic effect with simultaneous sterno-thoracic cardiopulmonary resuscitation (SST-CPR)and to investigate the mechanism for the blood flow generated by SST-CPR.
METHODS:
A canine model of ventricular fibrillation was used. Twelve mongrel dogs were divided into two groups. In the first six animals were resuscitated by using SST-CPR with the compression duration varied randomly at 2-minute intervals, 30%, 40%, and 50% of the CPR cycle, at a constant rate of 80/min. In the other six dogs, SST-CPR was performed with a randomly varied compression rate, 60, 80, 100, and 120/minute, at a 50:50 compression/relaxation ratio.
RESULTS:
During SST-CPR, increasing the compression relaxation ratio from 30:70 to 50:50 increased the end tidal CO2 from 10+/-2 mmHg to 15+/-3 mmHg. Increasing the compression rate from 60 to 100/minute tended to improve the carotid blood flow.
CONCLUSION:
The maximal hemodynamic effects with SSTCPR was generated when the compression rate was 100/minute and the compression/relaxation ratio was 50:50. A combination of the cardiac and the thoracic pump theories may be the mechanism for the blood flow produced by SST-CPR. |
| Key words:
Cardiopulmonary resuscitation, Cardiac arrest |
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