LUCAS持續(xù)胸腔按壓20分鐘對豬冠狀動脈的影響
[Abstract]:Background & objective: data show that the number of deaths from cardiac arrest in Europe is about 375,000 a year, and the figure is 275,000 in the United States, with most of the patients dying outside the hospital. Even for successful patients, the one-year survival rate was lower than 5. There are no exact figures for China, but deaths from sudden cardiac arrest are increasing year by year as eating habits and lifestyle changes. Rapid and effective cardiopulmonary resuscitation (CPR) is the rescue method for cardiac arrest. If the spontaneous heartbeat does not recover in time, it is necessary to prolong the time of chest compression to maintain effective coronary artery and brain blood circulation. However, the mortality rate of those patients who need to prolong chest compression increases with the time of compression. Studies have revealed that cardiac output can only reach 20 to 30 percent of the normal value during conventional artificial chest compression, and that the pressure efficiency begins to decline about a minute after the start of the artificial chest compression. After four minutes, the pressing efficiency is reduced to only 30% of the initial pressing efficiency. In addition, it is very difficult to carry out effective external artificial chest compression in the course of transporting patients. However, the interruption of extrathoracic cardiac compression, even for a very short period of time, can lead to the loss of perfusion of important organs. Inadequate perfusion of these organs can directly lead to the recovery of autonomic circulation and the reduction of the success rate of electrical defibrillation. Therefore, in recent decades, various kinds of mechanical automatic external chest compression system has been developed. LUCAS cardiopulmonary resuscitation machine (LUCAS) is a device which can provide 5cm deep pressing and active chest lifting. A large number of animal experiments and clinical data show that from the point of view of blood circulation and vital organ perfusion, the effect of LUCAS on patients with cardiac arrest is better than that of artificial compression. However, there is no study on the effect of mechanical compression of LUCAS on coronary artery. Therefore, the purpose of this study was to study the effect of LUCAS continuous extrathoracic compression on coronary artery function in pigs. Materials and methods: sixteen healthy Swedish domestic pigs weighing about 32kg were randomly divided into two groups: experimental group and control group, 8 pigs in each group. After general anesthesia, ventricular fibrillation (VF) was induced by electrical stimulation in experimental group. After 1min, LUCAS cardiopulmonary resuscitation machine was used for 20 min, then electrical defibrillation was performed. After defibrillation was successful, anesthesia was maintained for 30 min, then median thoracotomy was opened and 2mol/L potassium chloride (KCl), was injected into the central vein. After cardiac arrest, the distal segment of the anterior descending coronary artery was taken from the coronary artery and the organ bath test (organ bath). Was performed on the distal segment of the anterior descending coronary artery. The control group was treated with the same general anesthesia and maintained the same anesthesia time. Then KCL, was injected into the central vein of the central vein and the anterior descending branch of coronary artery was taken for 1 / 3 of the distal segment of the coronary artery and the organ bath experiment was carried out. Results: the maximal endothelium-dependent (EDRmax) of the experimental group and the control group were (96 鹵0.94)% and (98 鹵0.93)%, respectively. The difference between the two groups was not statistically significant (p0.05). The negative logarithm (pEC50) of substance P concentration was 7.13 鹵0.147.10 鹵0.13 when diastolic to 50% maximal contraction, and there was no significant difference between the two groups (p0.05). The diameter of coronary ring was 1.31 鹵0.15 mm and 1.27 鹵0.19 mm, respectively. There was no significant difference between them (p0.05). Conclusion: LUCAS has no significant effect on coronary endothelial function of porcine heart.
【學(xué)位授予單位】:鄭州大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2013
【分類號】:R459.7
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