Why is the P wave biphasic in V1?

The P wave in V1 is often biphasic. Early right atrial forces are directed anteriorly, giving rise to an initial positive deflection; these are followed by left atrial forces travelling posteriorly, producing a later negative deflection.

What does biphasic P wave indicate?

The presence of broad, notched (bifid) P waves in lead II is a sign of left atrial enlargement, classically due to mitral stenosis.

Is P wave negative in V1?

With proper lead placement, the P wave is positive in V1-V2 (A). However, on moving the leads up to the 3rd intercostal space, the P wave in V1 is predominantly negative and in V2 has a negative component.

What is V1 and V2 ECG?

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

In which lead would you see a biphasic P wave?

The P wave is typically biphasic in lead V1 (positive-negative), but when the negative terminal component of the P wave exceeds 0.04 seconds in duration (equivalent to one small box), it is abnormal.

Why are P waves bifid?

Bifid P waves are also referred to as P mitrale. Their presence indicates dyssynchrony between right and left atrial depolarisation; this may be normal, or suggestive of left atrial enlargement.

What are biphasic waves?

The biphasic T waves are known for dynamic change in polarity . It may either pull down the or pull up the adjacent ST segment . Prolonged QT interval is a closely related to the biphasic T wave. Some times a U wave can be inscribed in such a way it may mimic a biphasic T wave.

What does V1 mean on ECG?

The precordial, or chest leads, (V1,V2,V3,V4,V5 and V6) ‘observe’ the depolarization wave in the frontal plane. Example: V1 is close to the right ventricle and the right atrium. Signals in these areas of the heart have the largest signal in this lead. V6 is the closest to the lateral wall of the left ventricle.

Where is V1 lead applied?

V1 is placed to the right of the sternal border, and V2 is placed at the left of the sternal border. Next, V4 should be placed before V3.

What does P wave indicate?

The P wave represents the electrical depolarization of the atria. In a healthy person, this originates at the sinoatrial node (SA node) and disperses into both left and right atria.