2014年12月1日 · Normal ventricular sensing is inferred from the correspondence of the shock EGMs with the ventricular markers in the ventricular tachycardia (VT) zone (TS). The atrial EGM shows intermittent, high-amplitude pectoral myopotentials, which should not be recorded from an intact closely spaced, intracardiac bipole.

2018年11月1日 · Ventricular fibrillation (VF), uninterrupted, is fatal within minutes. Implantable cardioverter defibrillators (ICDs) sense ventricular electrograms (EGMs) during VF and detect the VF rhythm (a sequence of VF sensed events) to deliver a shock to …

To address the potentials for oversensing noncardiac or unwanted cardiac signals and for undersensing sinus rhythm or ventricular fibrillation (VF) due to low-amplitude cardiac EGMs, the basic sensing method was changed, 4 new features were added, and 3 existing features were modified. Details are provided in Supplemental Table 1.

VF is detected (Det. VF) when 18 out 24 intervals are found to be 300 ms or less (vertical dotted line). A horizontal bar below the “Det. VF” marker indicates that the capacitors are beginning to be charged for VF treatment

Ventricular fibrillation (VF), uninterrupted, is fatal within minutes. Implantable cardioverter defibrillators (ICDs) sense ventricular electrograms (EGMs) during VF and detect the VF rhythm (a sequence of VF sensed events) to deliver a shock to terminate VF and save lives.

The discriminating criteria offered by single chamber ICD include sudden onset, stability of the tachycardia cycle length and morphology of the ventricular EGM. The « sudden onset » criterion withholds therapies for tachycardia of gradual onset, and is typically used to prevent inappropriate therapies for sinus tachycardia.

Interrogation of his ICD demonstrated AF (*) on the atrial electrogram (A Egm) with an irregular ventricular response (**) that spontaneously degenerated to VF (***), as observed on the ventricular electrogram (V Egm). AS and VS on the marker channel refer to atrial- …

the EGM shows an extremely rapid and polymorphic ventricular arrhythmia corresponding to a VF episode correctly detected by the device; after 30 intervals classified as FS (programmed initial detection 30/40), initial detection of a VF episode; the charging of the capacitors begins only in the presence of VS markers;

Mapping techniques are used to study the significance of the morphological patterns of the electrograms (EGMs) obtained during VF in an experimental model. In 24 isolated rabbit heart preparations recordings were made of activation during VF using a multiple electrode (121 unipolar electrodes) posit …

2023年6月28日 · In multivariable Cox analysis, QRSp predicted VT/VF such that each peak increased VT/VF risk by 40%, while non-ECG-based risk factors and scores were not predictive. Among all patients with QRSp < 4, the annual event rate for VT/VF was <1% (Figure Figure1B 1B). These findings further support the importance of evaluating ventricular substrate ...