ECG R-Wave and Current of Injury: Module 1

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Author:

Sally Anzelc

Subject:

Science and Technology

Institution Name:

Connexions

Collection:

Connexions

Grade Level:

Post-secondary

Abstract:

An important diagnostic tool for the electrophysiologist is Electrocardiography (ECG). ECG is utilized clinically to diagnose heart electrical problems. If a cardiac device is indicated, permanent pacing or defibrillation leads are positioned through passive tines or by active fixation with a fixed or an extendable-retractable helix. Often, the myocardial tissue undergoes some localized injury post lead implantation called the current of injury (COI). The device analyzer records a heightened, broadened R-waveform. The clinician is unable to identify if an adequate R-wave is present or if the signal is confounded with the (COI). Clinicians may think an acceptable R-wave ( ≥ 5mV) is captured; however, a R-wave of 10mV during surgery can be reading 3mV one day after implantation once the COI subsides. Moreover, this R-wave over-estimation is correctable by repositioning the lead, but it will not be discovered until post implant, a situation requiring re-opening of the pocket and subjecting the sickly patient to more risks. Therefore, the goal of this project is to develop a research protocol to study the R-wave and (COI) in order to mitigate or to eliminate possible R-wave over-estimation. (J Am Coll Cardiol 2005;45:412-7)

Course Type:

Learning Module

Languages:

English

Material Type:

Readings

Media Format:

Text/HTML, Downloadable docs

Conditions of Use:

Creative Commons Attribution 2.0