| 摘要 |
<p>A method for determining displacement of a region of a patient's chest to which force is applied so as to cyclically compress and decompress the chest and administer thereby CPR to the patient comprising determining displacement of the chest region by double integrating over time acceleration of the chest region and correcting integration constants using information independent of the integration. The method comprises: a) determining an integration time period; b) determining an initial displacement and velocity; c) measuring acceleration during the time period; d) calculating chest displacement for the period by double integrating the acceleration over time, using the initial displacement and velocity as constants of the integration; e) determining a first difference between displacements at first and second times using one of the calculated displacements; f) determining a second difference independent of the calculated displacements; g) determining a third difference equal to a difference between the first and second displacements; h) repeating a) through g) for a next integration time period and adjusting one of initial velocity and/or acceleration measurements responsive to the third difference.</p> |
