System, method, computer, and computer program for secure data processing of potentially malicious code and documents or other data that may contain malicious code. A balloon catheter is movably disposed within the open lumen of the mapping catheter. The mounting frame is first inserted into a wall, followed by insertion of the electrical box into the mounting frame. The second converter uses the power switch in combination with a grounded auxiliary switch to produce soft-switching converter to operate in high switching frequencies. The Node Manager may be controlled by an Administrative Server directly or by an external administrative agent. A disclosed example method includes using a filter coefficient based on a plurality of cardiac images to characterize motion of a heart; computing an information-theoretic metric from the filter coefficient; and comparing the information-theoretic metric to a threshold to determine whether the motion of the heart is abnormal.