Abstract: A mapping catheter is positioned in a heart chamber, and active electrode sites are activated to impose an electric field within the chamber. The blood volume and wall motion modulates the electric field, which is detected by passive electrode sites on the preferred catheter. Electrophysiology measurements, as well as geometry measurements, are taken from the passive electrodes and used to display a map of intrinsic heart activity.

Abstract: A computer software program is described that maps the electrical activity of a patient's heart. The software program utilizes inputs from electrodes contained within a heart chamber. Inputs from the electrodes cause the program to calculate the heart chamber volume, and then to determine the position of the electrodes within the heart chamber. The program then utilizes inputs from the electrodes to calculate the three-dimensional volumetric electrical field distribution of said heart chamber. This calculation is accomplished using a spherical harmonic series expression. Finally, the computer program displays the electrical field distribution of the heart chamber.

Abstract: The present invention is related generally to a computerized system for monitoring, tracking and improving a patient's health. The system includes optional monitors which measure physiologic variables of the patient at a remote location such as the home, and transmits this information to a centralized office. Caregivers in the office monitor individual patients and make recommendations for patient monitoring and care based upon both the individual patients condition and progress as well as others within the system who are similarly situated. The system may operate over the World Wide Web and patient monitoring may include questionnaires and other forms of patient interaction.

Abstract: A collection of measurements are taken from a set of measurement electrodes to determine the position of a catheter in a heart chamber. The preferred measurement catheter includes a relatively large dielectric volume.

Abstract: A mapping catheter assembly 10 including a flexible lead body 12 and a deformable lead body 14. A lumen 22 is provided to accept a reference catheter 18 which includes a distal tip electrode assembly 29. In use an array 16 of electrode sites are deformed into a spherical shape after the assembly is placed in a heart chamber. The reference electrode assembly 29 is advanced into contact with the heart wall to provide calibration information for the array 16.

Abstract: An array of electrode sites are placed in a heart chamber. The shape of the chamber and the location of the electrodes is determined via impedance plethysmography. Electrical measurements taken from the electrode array and referenced to a surface contacting electrode is used to generate a three-dimensional map of electrical activity. A two-dimensional map of the electrical activity within the endocardial surface is also computed.

Abstract: Persons having respiratory diseases often have treatment programs including a pummeling of the thoracic cavity for the purpose of aiding respiration. A vest as a part of an alternating compression machine is used to eliminate the need for trained physical therapists and rather provide for mechanical thumping. A fitting routine for the vest is provided. A routine for identifying optimal operating frequencies for the machine is also provided, along with an algorithm for selecting appropriate frequencies.