9 research outputs found
Dynamic substrate map and isopotential maps of noncontact mapping.
<p>(A) Normalized peak negative voltage (PNV) distribution of the RV in a posterior caudal view. The orange border zone rerepresents areas with voltages around 30% of the peak negative potential. (B) Isopotential map shows the activation sequence (frames 1–4). Color scale has been set so that white indicates the most negative potential and purple indicates the least negative potential. Virtual electrodes (V1-1 to V1-4) are placed along the propagation of activation wavefront from EA site (Frame 1) to BO site (Frame 4). The green arrows indicate the activation wavefron propagating from EA to BO site, then spreading out at BO site. The virtual unipolar electrograms reveal a QS pattern at the origin.</p
Noncontact mapping findings of triggers.
<p>BO = breakout; EA = earliest activation; Eg = electrogram; PNV = peak negative value; Other abbreviations are the same as <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0140167#pone.0140167.t001" target="_blank">Table 1</a>.</p><p>Noncontact mapping findings of triggers.</p
Radiofrequency ablation and follow-up.
<p>RF = radiofrequency; Other abbreviations are the same as <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0140167#pone.0140167.t001" target="_blank">Table 1</a>.</p><p>Radiofrequency ablation and follow-up.</p
Baseline Clinical Characteristics of 35 Patients.
<p>* Measured by ventriculogram</p><p><sup>†</sup> Data are presented as median (range).</p><p>ARVC = arrhythmogenic right ventricular cardiomyopathy; ICD = implantable cardioverter-defibrillator; LVEF = left ventricular ejection fraction; NS = nonsignificant; PVC = premature ventricular contraction; RVEF = right ventricular ejection fraction; RVOT = right ventricular outflow tract; VT = ventricular tachycardia.</p><p>Baseline Clinical Characteristics of 35 Patients.</p
Representative example of the substrate maps during sinus rhythm.
<p>(A) Right and left lateral views of the endocardial bipolar and unipolar voltage maps demonstrate the areas of low voltage in the RVOT. (B) The activation map demonstrates the earliest activation site of the RVOT-VT (white circle).</p
The Hilbert-Huang Transformation (HHT) spectra and SAFE-T maps before and after ablation.
<p>(A) The HHT spectra prior to ablation demonstrates high frequency (>70Hz) fractionated potentials at the VT origin with corresponding heterogeneous HHT spectra while the area farther from the origin showed a homogenous HHT spectra with low frequency components (<70Hz). This is displayed in the 3D electroanatomic SAFE-T map (B, left panel) with the VT origins (white circle) showing a SAFE-T value >3.0 Hz·mV. After ablation (A, right panel and B, right panel), the high frequency fractionated potentials were eliminated and the corresponding HHT spectra at the VT origin exhibited a homogenous pattern with reduced high frequency components and SAFE-T value <3.0 Hz·mV.</p
Receiver Operating Characteristic (ROC) curve demonstrates the optimal threshold and goodness of fit for the SAFE-T map for the prediction of focal VT origin.
<p>Receiver Operating Characteristic (ROC) curve demonstrates the optimal threshold and goodness of fit for the SAFE-T map for the prediction of focal VT origin.</p