According to the European Resuscitation Council guidelines, the use of mechanical chest compression devices is a reasonable alternative in situations where manual chest compression is impractical or compromises provider safety. The aim of this study is to compare the performance of a recently developed chest compression device (Corpuls CPR) with an established system (LUCAS II) in a pig model. Methods. Pigs (n = 5/group) in provoked ventricular fibrillation were left untreated for 5 minutes, after which 15 min of cardiopulmonary resuscitation was performed with chest compressions. After 15 min, defibrillation was performed every 2 min if necessary, and up to 3 doses of adrenaline were given. If there was no return of spontaneous circulation after 25 min, the experiment was terminated. Coronary perfusion pressure, carotid blood flow, end-expiratory CO2, regional oxygen saturation by near infrared spectroscopy, blood gas, and local organ perfusion with fluorescent labelled microspheres were measured at baseline and during resuscitation. Results. Animals treated with Corpuls CPR had significantly higher mean arterial pressures during resuscitation, along with a detectable trend of greater carotid blood flow and organ perfusion. Conclusion. Chest compressions with the Corpuls CPR device generated significantly higher mean arterial pressures than compressions performed with the LUCAS II device.
The provision of sufficient chest compression is among the most important factors influencing patient survival during cardiopulmonary resuscitation (CPR). One approach to optimize the quality of chest compressions is to use mechanical-resuscitation devices. The aim of this study was to compare a new device for chest compression (corpuls cpr) with an established device (LUCAS II). We used a mechanical thorax model consisting of a chest with variable stiffness and an integrated heart chamber which generated blood flow dependent on the compression depth and waveform. The method of blood-flow generation could be changed between direct cardiac-compression mode and thoracic-pump mode. Different chest-stiffness settings and compression modes were tested to generate various blood-flow profiles. Additionally, an endurance test at high stiffness was performed to measure overall performance and compression consistency. Both resuscitation machines were able to compress the model thorax with a frequency of 100/min and a depth of 5 cm, independent of the chosen chest stiffness. Both devices passed the endurance test without difficulty. The corpuls cpr device was able to generate about 10-40% more blood flow than the LUCAS II device, depending on the model settings. In most scenarios, the corpuls cpr device also generated a higher blood pressure than the LUCAS II. The peak compression forces during CPR were about 30% higher using the corpuls cpr device than with the LUCAS II. In this study, the corpuls cpr device had improved blood flow and pressure outcomes than the LUCAS II device. Further examination in an animal model is required to prove the findings of this preliminary study.
The minimal invasive surgery is commonly used in clinical practice. The advantages such as less complication rate or shorter recovery time are unquestionable. But the lack of direct touch feedback and a narrow field of view makes this approach difficult for the surgeon to apply. To make the procedure easier, supportive systems are being build. One of the above is the camera control system constructed on the basis of the data from position sensors and an endoscope manipulating robot. Implemented features like speed adjustment or hysteresis ensure intuitive usage. The time necessary for the successful completion of the surgeon's training tasks with an accuracy of +/-10 mm decreased. Users gave positive feedback concerning the operation of the system.
Introduction: Over the past years several electro-mechanical devices have become available to the market, enabling paramedics to transport patients with cardiogenic shock to hospitals, while maintaining constant perfusion. These devices however have various mechanical structures and compression mechanisms that can affect the body perfusion. The presented paper shows the preliminary results of the comparison of two of such CPR devices using a pig model: the Lucas 2 and the Corpuls CPR.Methods: Two middle sized domestic pigs weighing 30+-5 kg were used for this study. They were properly pre-medicated and given general anesthesia.As preparation several sensors were placed to obtain vital parameters and blood flow during CPR. A normal oximeter was placed in the ear, and two regional oximetry sensors were placed at the level of the neck and on the tongue. Additionally the pressure at the left ventricle was captured using a Millar tip. The ECG and CO2 were obtained using the Corpuls 3 monitoring system. After preparations were finished and before CPR all the parameters were recorded as a baseline. Afterwards the heart was stopped for 5 minutes and afterwards the CPR device was activated.Results: The results obtained show that during the capturing of baseline parameters the mean carotid flow was of 0,31mL/min for the pig prepared for the Lucas 2 device and 230mL/min for the Corpuls device. After 3 minutes of CPR compressions the Lucas device generated 25% of the mean carotid flow, while the Corpuls device generated 76% of the carotid mean flow.
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