What does the U wave mean on ECG?

What does the U wave mean on ECG?

The ‘U’ wave is a wave on an electrocardiogram (ECG). It comes after the T wave of ventricular repolarization and may not always be observed as a result of its small size. ‘U’ waves are thought to represent repolarization of the Purkinje fibers.

What does V1 and V2 mean in ECG?

V1, V2 = RV. V3, V4 = septum. V5, V6 = L side of the heart. Lead I = L side of the heart. Lead II = inferior territory.

Is V2 a precordial lead?

The precordial, or chest leads, (V1,V2,V3,V4,V5 and V6) ‘observe’ the depolarization wave in the frontal plane.

Where are V1 and V2 leads placed?

The correct placement of V1 and V2 pericordial leads of the electrocardiogram (ECG) is on the fourth intercostal space to the right and the left margins of the sternum (Walsh, 2020).

What causes pathological U waves on ECG?

The origin of the U wave is still in question, although most authorities correlate the U wave with electrophysiologic events called “afterdepolarizations” in the ventricles. These afterdepolarizations can be the source of arrhythmias caused by “triggered automaticity” including torsade de pointes.

Where do you put V1 leads?

Third rib, third intercostal space, fourth rib, and then finally the fourth intercostal space. Again, V1 goes to the right of the sternum and V2 goes immediately to the left of the sternum.

Can U waves be normal?

The normal U wave is best seen at rest in the precordial leads and is more commonly seen during sinus bradycardia. Studies evaluating the response of the QT interval to tachycardia (produced by exercise or atrial pacing) in healthy individuals have often ignored the U waves.

What are the precordial leads on an ECG?

Anatomical aspects of the chest (precordial) leads. V1-V2 (“septal leads”): primarily observes the ventricular septum, but may occasionally display ECG changes originating from the right ventricle. Note that none of the leads in the 12-lead ECG are adequate to detect vectors of the right ventricle.

What is the function of the Precordial chest leads V5 V6?

Their line of sight is to view the electrical activity of the interventricular septum. Leads V5 and V6 lie over the left ventricle. Therefore, these leads view the electrical activity of the left ventricle. The precordial chest leads can be divided into groups which view specific areas of the heart.

What is the R/S ratio of RVH in precordial leads?

In the precordial leads there is an abnormal QRS progression and an abnormal R/S ratio < 1 in V6. In the “type A loop” of RVH (producing tall R waves in V1), there is an obligatory repolarization abnormality producing a downsloaine ST segment and an, inverted T wave.

Where do you place leads V2 and V3 in the body?

From the intercostal space associated with V2 (4th intercostal space), move your fingers down over the 5th rib to the 5th intercostal space. Place lead V4 in the 5 th intercostal space, in the midclavicular line. V3 is placed directly between leads V2 and V4.