Among his topics are leads and the normal electrocardiogram, heart rate and axis, intraventricular conduction
defects, rhythm disturbances, and pediatric electrocardiography.
The electrophysiological basis of aberrant intraventricular conduction
during atrial fibrillation.
Others include ventricular septal defect, single atrium, tetralogy of Fallot, coarctation of aorta and anomalous pulmonary venous return.4 This condition is also associated with various conducting system abnormalities such as tachyarrhythmias (supraventricular tachycardias, atrial fibrillation/flutter) or bradyarrhythmias (atrioventricular and intraventricular conduction
blocks).5,6 The most easily available modality to diagnose PLSVC is transthoracic echocardiography.
Mental stress could lead to augmentation of sympathetic system, catecholamine release which can lead to increase in the velocity of conduction in atria and influences on intraventricular conduction
time by changing autonomic balance, which can lead to reduced QRS duration.
It can cause non-specific changes on the electrocardiogram, such as sinus tachycardia, QT prolongation and intraventricular conduction
Ischemic injury can produce conduction block at any level of the atrioventricular and intraventricular conduction
His electrocardiography (ECG) demonstrated a sinus rhythm with an intraventricular conduction
disturbance, an atypical left bundle branch block, and a QRS interval of 160 ms.
Intra-atrial and intraventricular conduction
disturbances each occur in approximately 15% of patients with thyrotoxicosis .
In the index case, we noted intraventricular conduction
defect manifesting as slurring of QRS in chest leads III and aVL.
Atrial stimulation protocol revealed no ventricular preexcitation but showed aberrant intraventricular conduction
with both right and left bundle branch block (RBBB, LBBB) patterns.
Despite treatment with high-dose glucocorticoids, she developed intraventricular conduction
delay within 24 hours, followed by complete heart block.
Echocardiography (ECG) shows different changes in the form of sinus tachycardia, bundle branch blocks, intraventricular conduction
defect, atrial and ventricular premature complexes, atrial fibrillation, ventricular tachyarrhythmia, ST segment elevation or depression, and T wave inversion.