Intrinsicoid deflection
Encyclopedia
In the electrocardiogram
, the time of the onset of the intrinsicoid deflection, also referred to as the R wave peak time, is measured from the beginning of the QRS complex
to the peak of the R wave. The intrinsicoid deflection reflects the depolarization vector from the endocardium to the epicardium.
In the presence of bundle branch block or ventricular hypertrophy, the depolarization impulse takes a longer than normal period of time to reach the recording electrode. This delays the onset of the intrinsicoid deflection.
This prolongation or delay is an important criterion for diagnosing bundle branch block and ventricular hypertrophy. Onset of intrinsicoid deflection > 0.05 seconds (just over one small box) is used as a non-voltage related criterion to diagnose left ventricular hypertrophy
.
Electrocardiogram
Electrocardiography is a transthoracic interpretation of the electrical activity of the heart over a period of time, as detected by electrodes attached to the outer surface of the skin and recorded by a device external to the body...
, the time of the onset of the intrinsicoid deflection, also referred to as the R wave peak time, is measured from the beginning of the QRS complex
QRS complex
The QRS complex is a name for the combination of three of the graphical deflections seen on a typical electrocardiogram . It is usually the central and most visually obvious part of the tracing. It corresponds to the depolarization of the right and left ventricles of the human heart...
to the peak of the R wave. The intrinsicoid deflection reflects the depolarization vector from the endocardium to the epicardium.
In the presence of bundle branch block or ventricular hypertrophy, the depolarization impulse takes a longer than normal period of time to reach the recording electrode. This delays the onset of the intrinsicoid deflection.
This prolongation or delay is an important criterion for diagnosing bundle branch block and ventricular hypertrophy. Onset of intrinsicoid deflection > 0.05 seconds (just over one small box) is used as a non-voltage related criterion to diagnose left ventricular hypertrophy
Left ventricular hypertrophy
Left ventricular hypertrophy is the thickening of the myocardium of the left ventricle of the heart.-Causes:While ventricular hypertrophy occurs naturally as a reaction to aerobic exercise and strength training, it is most frequently referred to as a pathological reaction to cardiovascular...
.