electrogram


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electrogram

 [e-lek´tro-gram]
1. any record produced by changes in electric potential.
2. specifically, a cardiogram taken from the chambers of the heart or from a specific position within the chambers.
His bundle electrogram 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 mechanisms of arrhythmias and conduction defects.
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.

e·lec·tro·gram

(ē-lek'trō-gram),
1. Any record on paper or film made by an electrical event.
2. In electrophysiology, a recording taken directly from the surface by unipolar or bipolar leads.

electrogram

/elec·tro·gram/ (e-lek´tro-gram) any record produced by changes in electric potential.
esophageal electrogram  one recorded by an esophageal electrode, for enhanced detection of P waves and elucidation of complex arrhythmias.
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.
intracardiac electrogram  a record of changes in the electric potentials of specific cardiac loci, as measured with electrodes placed within the heart via cardiac catheters; 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.
Enlarge picture
Intracardiac electrograms. Schematic illustrations of several intracardiac electrograms contrasted with a conventional body-surface electrocardiogram (ECG). HRA = high right atrial electrogram; HBE = His bundle electrogram, in which A = low right atrial activity, H = His bundle activity, and V = ventricular septal activity; also shown are the P–R, P–A, A–H, and H–V intervals.

electrogram

[ilek′trōgram′]
Etymology: Gk, elektron + gramma, record
a unipolar or bipolar record of the electric activity of the heart as recorded by electrodes within the cardiac chambers or on the epicardium. Examples are the atrial electrogram, ventricular electrogram, and His bundle electrogram.

electrogram

Cardiology The recording of the cardiac waveforms as taken at an electrode in the heart; electrogram may be transmitted from an implanted pacemaker by telemetry

e·lec·tro·gram

(ĕ-lek'trō-gram)
1. Any record on paper or film made by an electrical event.
2. electrophysiology A recording taken directly from the surface by unipolar or bipolar leads.

electrogram

any record produced by changes in electric potential.

His bundle electrogram
an intracardiac electrocardiogram of potentials in the bundle of His, done through a cardiac catheter.
References in periodicals archive ?
The potential for inappropriate ventricular tachycardia confirmation using the intracardiac electrogram (EGM) width criterion.
45) The oesophageal probe can be connected to the ECG machine in the same way that the atrial epicardial wires can be, allowing a recording of the atrial electrogram.
This finding is clearly illustrated by the diversity in the phylogenetic clustering pattern and the mixed electrogram pattern of these segments (Table 2).
If a dual-chamber device had been implanted and an atrial electrogram was available, the atrial electrogram was also used to characterize ICD-recorded episodes.
PO1-105 - Correlation of Electrogram Characteristics and Localized Sources for Human AF.
Without this technology, catheter tip-to-tissue contact has to be estimated through other indirect measures such as electrogram parameters and impedance but they have been shown to be poor predictors of contact force.
This level of high resolution electrogram is something we have never seen before and I believe it will open a whole new array of possibilities in EP.
Preliminary results from the ST-DETECT Trial using high-fidelity intracardiac electrogram (EGM) signals in ICDs show a low spontaneous coronary event rate (such as heart attack) among these patients.
Objective: The instant of maximum slope (Tup) of the T wave in the unipolar electrogram is a well-established measure of repolarisation time (TR).
The spatial effects of nerve stimulation on atrial repolarization were determined by integrating the areas subtended by the activation and repolarization portions of each atrial electrogram (5).