What means P waves?

What means P waves?

The P wave represents the electrical depolarization of the atria. Depolarization of the right atrium is responsible for the early part of the P wave, and depolarization of the left atrium is responsible for the middle and terminal portions of the P wave.

What does S in as wave stand for?

shear wave
An S wave, or shear wave, is a seismic body wave that shakes the ground back and forth perpendicular to the direction the wave is moving.

What are P waves S-waves and L waves?

There are two types of seismic waves : Body waves. Surface waves….Difference between s waves and p waves.

P waves	S waves
The first wave to hit seismographs	Second waves to hit seismographs
They are compression waves	They are shear waves
Can move through solids and liquids	Can only move through solids

What causes elevated P waves?

The presence of tall, peaked P waves in lead II is a sign of right atrial enlargement, usually due to pulmonary hypertension (e.g. cor pulmonale from chronic respiratory disease).

What is the P wave before QRS?

P waves are the key to determining whether a patient is in sinus rhythm or not. If P waves are not clearly visible in the chest leads, look for them in the other leads. The presence of P waves immediately before every QRS complex indicates sinus rhythm.

Are P waves shear waves?

Body waves are of two types: Primary waves (also called P-waves, or pressure waves) and Secondary waves (S-waves, or shear waves). P-waves are compression waves. S-waves are shear waves. They only propagate in solid material.

How are P and S waves similar?

P waves and s waves are alike because they are both types of seismic waves produced by the sharp movement of rock within the earth.

What is P wave velocity?

Compressional or P-wave velocity (primary wave) measurements are a measure of the velocity of sound waves through Earth materials with distance vs. time. P-wave velocity data were collected on marine cores during DSDP; however, these measurements were taken at discrete locations.

What is the interval between the P and S waves?

S waves are indicated by an abrupt change in wave amplitude. In the seismogram below, we see that the S wave arrived at about 34 sec after the P wave arrived. This time difference is called the S-P interval and is the lag time between the P and S wave.

The P wave often has a sharp, peaked appearance. This increased voltage is caused by hypertrophy or acute strain of right atrial tissue. Causes of right atrial enlargement include COPD, mitral stenosis, mitral regurgitation, or pulmonary emboli.

What do P waves and QRS waves represent?

It is the most obvious part of the ECG, which is clearly visible. The QRS complex represents the depolarization of ventricles. It shows the beginning of systole and ventricular contraction. The QRS complex or wave starts with a small deflection downwards, represented by the point Q. It follows the P wave.

What happens during P wave?

The P wave occurs because of atrial depolarization, which initiates a wave of contraction to squeeze blood into the ventricles. To pump blood back into the body, ventricular depolarization occurs. Atrial repolarization and ventricular depolarization happen almost simultaneously and are represented on an ECG wave by the QRS complex.

What does the P wave relate to on the ECG?

The P wave on the ECG represents atrial depolarization, which results in atrial contraction, or atrial systole.