What does a notched QRS indicate?

It has been show in some studies that a subtle abnormality within the QRS complex can represent conduction disturbance and myocardial scar. A notch in the QRS complex in patients with left ventricular hypertrophy has been suggested to be a result of an intraventricular conduction defect [1].

What does an abnormal QRS complex mean?

• Shape of an abnormal QRS complex varies from almost normal to wide and bizarre and/or slurred and notched. • Tall QRS complexes are usually caused by hypertrophy of one or both ventricles, or by an abnormal pacemaker or aberrantly conducted beat.

What is a biphasic QRS?

Biphasic QRS complex is a complex when there are 2 waves present in a QRS complex.

What is QRS configuration?

Background: The QRS configuration produced by ventricular pacing during sinus rhythm (pace mapping) can locate focal idiopathic ventricular tachycardias during catheter mapping, but postinfarction reentry circuits may be relatively large and contain regions of slow conduction.

When does the notching of the QRS complex occur?

Electrocardiograms from a seborrheic patient before (above) and after (below) degreasing the presternal skin. The arrows point out notching (upper tracings) and subsequent normalization (lower tracings) of the QRS complex. common in one or more leads. This widening disappeared once the skin had been properly cleaned.

How is QRS notching or slurring related to IHD?

less than infarct criteria for IHD, the prevalence of QRS notching or slurring was 62.8%, while only 11.6% showed abnormal Q waves. Analysis indicated that QRS notching or slurring has a sensitivity of 62.2% and a spcci- ticity of 93.8% for the detection of IHD. The study Address for reprints: David G. Penney. Ph.D.

When is a PVC QRS complex fqrs positive?

If the QRS complex of PVC only has 2 notches in the R waves, they considered the QRS complex to be fQRS-positive when the notches were > 40 ms apart and present in 2 contiguous leads [4] (Figure 3). Open in a separate window Figure 3 Fragmented wide QRS complex.

How many notches are needed to qualify for fqrs?

In the presence of a wide complex QRS (>120 ms), more than two notches in the R or S wave in two or more contiguous leads are necessary to qualify as fQRS. [1] Contiguous leads mean anterior leads (V 1 -V 5 ), lateral leads (I, aVL, and V 6 ), or inferior leads (II, III, and aVF).