What are four basic properties of waves?
However, all waves have common properties—amplitude, wavelength, frequency, and speed. Amplitude describes how far the medium in a wave moves. Wavelength describes a wave’s length, and frequency describes how often it occurs. Speed describes how quickly a wave moves.
What is a surface wave made of?
A surface wave is a combination of a transverse wave and a longitudinal wave. A transverse wave is a wave in which particles of the medium move up and down perpendicular to the direction of the wave. A longitudinal wave is a wave in which particles of the medium move parallel to the direction of the wave.
What is the fastest surface wave?
Love wave
What is PS and L waves?
In P or compressional waves, the vibration of the rock is in the direction of propagation. P waves travel fastest and are the first to arrive from the earthquake. The different S waves arrive after the P waves. The slowest (and latest to arrive on seismograms) are surface waves, such as the L wave.
What ECG has no P wave?
Note that there are quite a few arrhythmias that are regularly irregular, such as second-degree AV block type I (Wenkebach). This means an ECG showing atrial fibrillation will have no visible P waves and an irregularly irregular QRS complex.
What causes inverted P waves?
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.
Can normal sinus rhythm has inverted P waves?
This results in an inverted P wave in lead II (normally upright in sinus rhythm) and an upright P wave in aVR (normally inverted in sinus rhythm). Depending on the exact location of the pacemaker in a junctional rhythm, the P wave location may vary.
Does an inverted P wave always indicate a junctional rhythm?
Does an inverted P wave always indicate a junctional rhythm? No, atrial rhythms can also have inverted P waves if the impulse originated low enough in the atria. You can differentiate between the 2 by looking at the PRI; in a junctional rhythm it will be less than 0.12 second.
What do inverted T waves mean?
The T wave represents ventricular repolarization, and its direction is normally the same as the major deflection of the QRS complex that precedes it. 2 T-wave inversion may indicate myocardial ischemia and may also precede the development of ST-segment elevation.
Should I worry about inverted T waves?
They are asymptomatic and have otherwise normal hearts. So, my advice to you is not to worry. Inverted T-waves are not uncommon, and you don’t need to be overly anxious about them as long as you continue to feel well and have normal echocardiograms and stress tests.
How do you treat inverted T waves?
If inverted T waves are identified and myocardial ischemia is suspected, appropriate management includes anti-ischemic therapy, anti-thrombotic therapy, and anti-platelet therapy as outlined in the Unstable Angina and Non-ST Elevation MI sections.
Can anxiety cause inverted T waves?
A study by Whang et al. (2014) showed that depressive and anxious symptoms were associated with abnormalities in T wave inversions.