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: Conduction volumetry is used to determine the hemo-dynamic performance of the heart under various pacing protocols to optimize cardiac output as a function of the pacing protocol.

Abstract: A method of acquiring and mapping physiological data in a heart chamber includes inserting a catheter into the heart chamber. Physiological data in the heart chamber is acquired with the catheter. The position of the catheter is determined, and the location of the acquired physiological data is determined using the position of the catheter. Information related to the three-dimensional geometry of at least a portion of the heart chamber is received, and a three-dimensional map of the physiological data is created and superimposed on a geometrical representation of the three-dimensional geometry information.

Abstract: A method of acquiring and mapping physiological data in a heart chamber includes inserting a catheter having an electrode into the heart chamber. Physiological data in the heart chamber is acquired with the electrode. The position of the electrode is determined, and the location of the acquired physiological data is determined using the position of the electrode. The acquired physiological data is integrated with the location of the acquired physiological data. Information related to the three-dimensional geometry of at least a portion of the heart chamber is received, and a continuous three-dimensional color-coded map of the physiological data is created and superimposed on a geometrical representation of the three-dimensional geometry information. The map is then utilized to deliver ablation therapy.

Abstract: A method of delivering ablation therapy in a heart chamber includes inserting a catheter in the heart chamber. Electrophysiological data in the heart chamber is acquired with the catheter. The position of the catheter is determined using an electromagnetic field source external to the heart chamber, and the location of the acquired electrophysiological data is determined using the position of the catheter. The acquired electrophysiological data is integrated with the location of the acquired electrophysiological data. Information related to the three-dimensional geometry of at least a portion of the heart chamber is received. A continuous three-dimensional color-coded map of the electrophysiological data is created and superimposed on a geometrical representation of the three-dimensional geometry information. The map is then utilized to deliver ablation therapy.

Abstract: A method of acquiring and mapping electrophysiological data in a heart chamber includes inserting a catheter having an electrode into the heart chamber. Electrophysiological data in the heart chamber is acquired with the electrode, and the position of the electrode is determined by using an electromagnetic field source external to the heart chamber. A geometrical representation of at least a portion of the heart chamber is created, and a three-dimensional map of the electrophysiological data is created and superimposed on the geometrical representation.

Abstract: A method of acquiring and mapping electrophysiological data in a heart chamber includes inserting a catheter into the heart chamber. Electrophysiological data in the heart chamber is acquired with the catheter. The position of the catheter is determined by using an electromagnetic field source external to the heart chamber, and the location of the acquired electrophysiological data is determined using the position of the catheter. Information related to the three-dimensional geometry of at least a portion of the heart chamber is received, and a continuous three-dimensional color-coded map of the electrophysiological data is created and superimposed on a geometrical representation of the three-dimensional geometry information.

Abstract: A method of acquiring and mapping physiological data in a heart chamber includes inserting a catheter having an electrode into the heart chamber. Physiological data in the heart chamber is acquired with the electrode, and the position of the electrode is determined. A geometrical representation of at least a portion of the heart chamber is created, and a three-dimensional map of the physiological data is created and superimposed on the geometrical representation.

Abstract: A method of representing the geometry of at least a portion of a human heart chamber includes positioning a catheter in a heart chamber. The position of the catheter in the heart chamber is determined. The catheter is re-positioned and the position is re-determined a plurality of times to determine the geometry of at least a portion of the heart chamber. A three-dimensional, anatomical representation of at least a portion of the heart chamber is then created.

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: A method of constructing a mapping catheter is described where the catheter has numerous electrodes each associated with a single connection in a plug. The method consists of first arranging a plurality of wires in the desired relationship, with each of the wires running to a connection in a plug. Next, a single electrode is formed on each wire. Because it is often difficult to associate a particular connection with a particular plug, an electrical signal is then applied to a single one of the wires. The electrical signal can be applied to the connection or to the electrode. The electrical signal is then found among by examining either the electrodes or the connections, depending on which where the electrical signal was applied. Once the electrical signal is discovered, a map can be made between the connections and the electrodes.

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 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 system for mapping electrical activity of a patient's heart includes a set of electrodes spaced from the heart wall and a set of electrodes in contact with the heart wall. Voltage measurements from the electrodes are used to generate three-dimensional and two-dimensional maps of the electrical activity of the heart.

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 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.