Effects of different cardiopulmonary resuscitation qualities on hemodynamics and aerobic metabolism in pigs with cardiac arrest
- VernacularTitle:心肺复苏质量对心博骤停猪血流动力学及氧代谢的影响
- Author:
Zhaoxia LIU
;
Chunsheng LI
- Publication Type:Journal Article
- Keywords:
Cardiac arrest;
Cardiopulmonary resuscitation;
Chest compression;
Hemodynamics
- From:
Chinese Journal of Emergency Medicine
2008;17(11):1152-1157
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effects of different cardiopulmonary resuscitation (CPR) qualifies under Q-CPR control on hemodynamics and aerobic metabolism in pigs with cardiac arrest. Method After eighteen pigs (mass [ (30+ 1) kg] were anesthetized,a Swan-Ganz catheter was positioned through the right femoral vein and linked with a continuous cardiac output monitor. An electrode cable was positioned into right ventricle through left internal jugular vein. Then different catheters were positioned in the arteriae aorta, carotid artery and fight atrium successively. Ventricular fibrillation (VF) was induced by a programmed electrical stimulation equipment. All animals underwent 4 minutes of untreated VF and then were randomly assigned to either standard CPR or nonstandard CPR. A Philips HeartStart MRx Monitor/Defibrillator was used to ensure qualifies of chest compression (e.g., depth, rate and chest recovery) by Q-CPR technology. Pigs in standard CPR group were treated with standard compression with a compression rate of 100 beat/min, a compression-ventilation ratio of 30:2, and a depth of with 38～51 mm with 100% decompression. Pigs in nonstmdard CPR group were treated with nonstandard compression with a depth of 60%～70% of standard depth with unsatisfactory decompression. Defibrillations were administered after 9 minutes of compressions and vetilations. Cardiac output (CO), mean aortic pressure (MAP) and coronary perfusion pressure (CPP) were recorded at different periods. Oxygen delivery (DO2) and oxygen consumption (VO2) were calculated according to blood gas analysis. At last,number of the survivals was recorded.Data were calculated by SPSS 11.5 statistics software. Statistical analysis was performed using Chi-Square Test and two independent samples t testing. Results The return of spontaneous circulation (ROSC) achievement ratio with nonstandard CPR was 28.6% and with standard CPR was significantly greater (90.9%, P=0.013).Hemodynamics (e. g., CPP, CO and MAP) and systemic oxygenation with standard CPR were much better. Conclusions In this animal model of cardiac arresr in pigs, standard CPR could improve hemodynarmics by increasing CPP and CO. And standard CPR could beneficial aerobic metabolism by increasing DO2 and VO2. As a result, ROSC achievement ratio of pigs with standard CPR was much greater.
