2009年12月11日 · The following ECG features were assessed in each pace map and VT: (1) QRS duration (QRSd); (2) pseudo-delta wave (PdW), intrinsicoid deflection time (IDT), shortest RS complex (SRS), and maximum deflection index (MDI); and (3) presence of q waves in lead I (QWL1) and presence of q wave in inferior leads (Figure 2).

An MDI of ≥55 ms had a high sensitivity and specificity to identify an epicardial ventricular tachycardia origin in patients without structural heart disease.

An electrocardiographic marker has been proposed to quantify the prolongation of the initial part of the QRS [22]. The maximum deflection index (MDI) is calculated as follows: earliest time to maximum deflection in any precordial lead divided by the total QRS duration (Table 1) [22].

The MDI was calculated by dividing the time from onset of the QRS complex to the earliest point of maximum deflection in V5-V6 by the QRS duration. Results: Septal-lateral delay was associated ...

Maximum deflection index (MDI) is a quantitive measure of the rapidity of depolarization of the myocardium. In previous studies, high MDI was found to indicate epicardial origin of ventricular tachycardia. We aimed to detect the relationship between echocardiographic intraventricular dyssynchrony and MDI.

Cardiovascular disease is the main cause of death worldwide. An electrocardiogram (ECG) signals is typically used as the first diagnosis tool to detect abnormality in the heart signal.

2017年5月1日 · We aimed to detect the relationship between echocardiographic intraventricular dyssynchrony and maximum deflection index (MDI). The maximum deflection index was calculated by dividing the time from onset of the QRS complex to the earliest point of maximum deflection in V5-V6 by the QRS duration.

Specifically, a large maximum deflection index (MDI) of the VT, which is a metric of the rapidity of depolarization of the myocardium, is thought to indicate epicardial foci. In the Daniels et al. [2] study, MDI ≥ 0.55 had 100% sensitivity and 98.7% specificity for epicardial VT.

2011年11月1日 · A maximal deflection index (MDI, the longest precordial lead onset-peak time/total QRS duration) of 0.55 or more was reported to identify idiopathic epicardial VT with high sensitivity and specificity. 4 Three other interval criteria have been reported to predict epicardial VT origin in a population with structural heart disease: a pseudo ...

2021年9月22日 · Maximum deflection index (MDI) and pseudo-delta wave were 0.57 and 38 ms, respectively. The patient underwent electrophysiological (EP) study, and clinical VT was induced by rapid right ventricular pacing.