intracardiac electrogram

a record of changes in the electric potentials of specific cardiac loci as measured by electrodes placed within the heart via cardiac catheters; it is used for loci that cannot be assessed by body surface electrodes, such as the bundle of His or other regions within the cardiac conducting system. See illustration.

Intracardiac electrogram. Schematic illustration shows a single beat with accompanying intracardiac signals from the sinus node, right atrium, atrioventricular (AV) nodal and His bundle regions, and right ventricle, contrasted with a conventional body-surface electrocardiogram (ECG). A, Atrial recording; H, His recording; V, ventricular recording.


Medical dictionary. 2011.

Look at other dictionaries:

  • intracardiac electrocardiogram — see under electrogram …   Medical dictionary

  • His bundle electrogram — (HBE) an intracardiac electrogram of potentials in the lower right atrium, atrioventricular node, and His Purkinje system, obtained by positioning intracardiac electrodes near the tricuspid valve; it is used to pinpoint the site, extent, and… …   Medical dictionary

  • coronary sinus (CS) electrogram — an intracardiac electrogram that records electrical potentials within the coronary sinus; it is used for indirect monitoring of left atrial and left ventricular sites …   Medical dictionary

  • high right atrial (HRA) electrogram — an intracardiac electrogram that records electrical potentials within the upper region of the right atrium, obtained by introduction of electrodes high in the atrium near the sinus node; used in localizing conduction blocks and diagnosing… …   Medical dictionary

  • intra-atrial electrogram — an intracardiac electrogram of potentials within the atrium; used particularly for monitoring P waves …   Medical dictionary

  • right ventricular electrogram — an intracardiac electrogram obtained by placing electrodes in the right ventricle; used to assess ventricular activity and response to stimuli …   Medical dictionary

  • right ventricular apical electrogram — an intracardiac electrogram obtained by placing electrodes in the apex of the right ventricle; it is used in mapping ventricular arrhythmias …   Medical dictionary

  • sinus node electrogram — an intracardiac electrogram obtained by placing electrodes near the sinus node; it is used in examining the time for impulse conduction from the node to the atrium …   Medical dictionary

  • IEGM — intracardiac electrogram …   Medical dictionary

  • IEGM — • intracardiac electrogram …   Dictionary of medical acronyms & abbreviations

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