what are bifid p waves?
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Bifid P waves (known as P mitrale) indicate left-atrial abnormality - e.g. dilatation or hypertrophy. If at least three different shaped P waves can be seen in a given ECG lead tracing, this implies that even if one of them arises from the SA node, at least two others are arising elsewhere.
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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.
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['Left atrial enlargement.', 'Left axis deviation.', 'ST elevation in the right precordial leads V1-3 (“discordant” to the deep S waves).', 'Prominent U waves (proportional to increased QRS amplitude).']
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Earthquakes produce very powerful seismic waves that can be classed as infrasound waves. Seismic waves from large earthquakes are detected around the world. ... P-waves can travel through solids and liquids. P-waves are detected on the opposite side of the Earth.
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They include P, or primary, waves and S, or secondary, waves. P waves cause the ground to compress and expand, that is, to move back and forth, in the direction of travel. They are called primary waves because they are the first type of wave to arrive at seismic recording stations.
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Sinus tach and most SVTs have only one P wave for each QRS complex. They may or may not be buried in the preceding T waves. But there are other supra-ventricular tachycardias that have more than one P wave for each QRS or no P waves. Atrial fibrillation has no P waves.
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P and S waves' paths through Earth. The speed of P waves and S waves increases as they travel deeper into the Earth's mantle . They travel through the Earth in curved paths, but they change direction suddenly when they pass through the boundary between substances in different states.
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Three types of seismic waves are P waves, S waves, and surface waves.
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P Waves are compressional which means they move through (compress) a solid or liquid by pushing or pulling similar to the way sound travels through the air. The particles of the material a P Wave pushes through move in the direction of the P wave's energy. This is called the direction of wave propagation.
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Wider than a normal QRS (usually ≥0.12 second) c. The QRS morphology is generally bizarre. d. A preceding P wave is absent; however, retrograde conduction of a premature ventricular contraction can occasionally result in an inverted P wave after the QRS complex.
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The PQ interval (sometimes referred to as the PR interval as a Q wave is not always present) indicates how fast the action potential is transmitted through the AV node (atrioventricular) from the atria to the ventricles.
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If the P wave is inverted, it is most likely an ectopic atrial rhythm not originating from the sinus node. Altered P wave morphology is seen in left or right atrial enlargement. The PTa segment can be used to diagnose pericarditis or atrial infarction.
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Body waves are of two types: compressional or primary (P) waves and shear or secondary (S) waves. P- and S- waves are called "body waves" because they can travel through the interior of a body such as the Earth's inner layers, from the focus of an earthquake to distant points on the surface.
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In A-Fib you will see many “fibrillation” beats instead of one P wave. A characteristic sign of A-Fib is the absence of a P wave in the EKG signal. The next large upward spike segment, the QRS Complex, is formed when the ventricles (the two lower chambers of the heart) are contracting to pump out blood.
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Delta waves are slow, low-frequency brainwaves (between 1.5-4 hertz) that are the dominant brainwave pattern of deep (stage 3 and 4), NREM sleep. ... In a process called entrainment (aka “tuning the brain”), when exposed to sound waves at certain frequencies, brainwave patterns adjust to align with those frequencies.
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P-waves and S-waves are body waves that propagate through the planet. P-waves travel 60% faster than S-waves on average because the interior of the Earth does not react the same way to both of them. ... The energy is thus less easily transmitted through the medium, and S-waves are slower.
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There are three basic types of seismic waves – P-waves, S-waves and surface waves.