感染性休克時心臟和微循環(huán)的功能變化及β受體阻滯劑的血流動力學效應
[Abstract]:Objective:
Whether patients at all stages of sepsis, septic shock, and myocardial suppression develop to sepsis benefit from beta-blockers, and the effects of beta-blockers on cardiac systolic and diastolic function, arterial system, venous return system, and vascular waterfall sites.
Method:
Clinical section: 32 patients with sepsis, severe sepsis, septic shock and standard treatment, who were admitted to the Department of Critical Medicine of Peking Union Medical College Hospital from February 2014 to April 2014, were selected. The Ramsay sedation score was 2-4, but the heart rate was still above 100 beats/minute. Esmolol was given to 32 patients, and the target heart rate was lower than the baseline. All patients received transthoracic echocardiography (TTE) and tissue perfusion parameters within 1 hour before administration and 2 hours after reaching the target heart rate.
Animal experiment: Eight mongrel dogs were given tracheal intubation and ventilator to assist respiration after anesthesia, and the monitoring system of pulmonary artery catheterization and pulse indicator continuous cardiac output (PICCO) was established; the changes of cardiac contraction and diastolic function were monitored by transesophageal echocardiography (TEE); the dogs were operated on under aseptic condition and left ventricle was operated on. The left renal artery renal blood flow (RBF) was monitored in real time with a probe placed in the renal artery. The dogs were ventilated for 10 seconds at four different levels of airway pressure. The four levels of airway pressure (5 cm H20, 15 cm H20, 25 cm H20, 35 cm H20) were selected. Steady state CVP was used instead of renal venous reflux pressure and mean arterial pressure was used instead of renal perfusion. Pressure. A linear regression equation was established to measure the critical closing pressure (Pcc) and mean systemic filling pressure (MSFP) in each dog. The parameters of vascular cascade, arterial system and venous reflux system were calculated. The arteries, central veins, mixed veins, lactic acid and static arteries were detected. The total dose of LPS was 5.3 ug/Kg. The characteristics of arterial system and venous reflux system in baseline stage, baseline stage of septic shock, hyperdynamic stage of septic shock, hypodynamic stage of septic shock were studied. The development of vascular waterfall was also studied. The low dynamic stage of septic shock (myocardial suppression stage) was studied, and the LVEF decreased to below 45% to reach the standard of myocardial inhibition in septic shock. Animals with toxic myocardial arrest benefit.
Result:
Clinical part: The left ventricular outflow velocity time integral (VTI) of sepsis patients after beta-blocker administration was higher than that before administration. Ventricular diastolic function assessment showed that improved compliance was the basis of VTI elevation. In addition, this study considered that the increase of VTI was the result of comprehensive improvement of cardiac function. Therefore, we compared the ultrasonic data of the two groups before treatment and found that MAPSElat could be used as a parameter to predict the increase of VTI and ROC curve. The cut off value was MAPSElat = 1.34, and VTI was more likely to rise in patients who did not have excess capacity before beta-blockers were given.
Animal experiment: with sepsis, vascular waterfall disappears and tissue perfusion becomes worse. This process is always accompanied by the whole process of septic shock. High C0 does not improve tissue perfusion in septic shock with hyperdynamic state, and high CO does not make the waterfall recur, while low CO makes tissue perfusion in septic myocardial suppression with hypodynamic state. Further deterioration. Systemic flow in septic shock is related to the volume of circulatory tension, while the volume of tension is related to shock resuscitation and system compliance.
Conclusion:
MAPSElat 1.34 can be used as a threshold to predict the rise of VTI, making beta-receptor blockers safer for clinical use. Ventricular compliance and diastolic function improved after the use of beta-receptor blockers. Decreased CO and tissue perfusion can be altered. Not parallel.
In septic shock, Pcc decreases, resulting in the disappearance of vascular cascade effect. C0 changes, does not change vascular cascade effect, does not change the pressure at the beginning and the end of the cascade; upstream and downstream resistance of the cascade changes with the change of CO; the change of tension capacity affects the change of C0. The change of CO is not parallel to the change of tissue perfusion. Effect is an important factor affecting tissue perfusion.
In the myocardial suppression stage of sepsis, beta-blocker therapy can improve ventricular compliance, increase Pcc and restore the vascular cascade effect; the cascade effect is related to the improvement of tissue perfusion.
【學位授予單位】:北京協(xié)和醫(yī)學院
【學位級別】:博士
【學位授予年份】:2014
【分類號】:R459.7
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