Supernormal ventricular conduction
in dog heart (Abstract).
This recent interest has mainly been stimulated by the very successful introduction of cardiac resynchronization therapy as a new, device-based treatment option for patients with end-stage heart failure and ventricular conduction
delays in the mid-1990s.
Blocking these channels decreases the slope of phase 0, which also leads to a decrease in the amplitude of the action potential and hence slows the ventricular conduction
Ventricular hypertrophy is a known risk factor for QT prolongation and altered ventricular conduction
and repolarization (Ben-David et al.
A prolonged QRS interval suggests a diseased ventricular conduction
system and has been associated with increased risk for sudden cardiac death, among other heart disorders.
If the bundle branches are blocked or conduction originates outside of the normal ventricular conduction
fibers, the slower depolarization over alternative pathways results in a wide QRS waveform.
2, the decrease in the rate of depolarization of action potential slows intra ventricular conduction
and increases the duration of QRS complex.
5 mm) in leads II, III, or aVF QRS complex Right axis deviation or rightward axis shift Clockwise rotation Right ventricular conduction
delay Right ventricular hypertrophy Pseudoinfarction Inferior Anterior Both Left axis deviation (rarely) ST segment Elevation inferiorly and/or anteriorly Depression T wave Inversion inferiorly Inversion anteriorly QT prolongation Modified from references 2 and 7
Cardiac resynchronization therapy became the standard treatment for patients with heart failure refractory to standard medication and delay in ventricular conduction
Electrocardiogram revealed a normal sinus rhythm, normal P wave axis, normal P-R interval and left ventricular conduction
Fragmented QRS (fQRS) complexes are special electrocardiographic signals, which reflect altered ventricular conduction
around regions of myocardial scaring.
Fuster et al (4) Left ventricular conduction
delay 51 7.