Which seismic waves move side to side?
Which seismic waves move side to side?
Love waves
What are the 4 types of seismic waves?
Seismic Wave Motions—4 waves animated
- Body Waves – Primary (P) & Secondary (S) Waves.
- Surface Waves – Rayleigh & Love Waves.
What seismic waves travels horizontally that is transverse to the direction the wave?
A Love wave is a surface wave having a horizontal motion that is transverse (or perpendicular) to the direction the wave is traveling.
What are the 3 types of seismic wave?
There are three basic types of seismic waves – P-waves, S-waves and surface waves.
What does P in AP WAVE stands for?
Compressional waves are also called P-Waves, (P stands for “primary”) because they are always the first to arrive.
What is a normal P wave?
The P wave is the first positive deflection on the ECG. It represents atrial depolarisation. Normal duration: < 0.12 s (< 120ms or 3 small squares)
What does a normal P wave look like?
It looks like a small bump upwards from the baseline. The amplitude is normally 0.05 to 0.25mV (0.5 to 2.5 small boxes). Normal duration is 0.06-0.11 seconds (1.5 to 2.75 small boxes). The shape of a P-wave is usually smooth and rounded.
What do abnormal P waves indicate?
An abnormal P wave may indicate atrial enlargement. Atrial depolarization follows the discharge of the sinus node. Normally depolarization occurs first in the right atrium and then in the left atrium. Atrial enlargement is best observed in the P waves of leads II and V1.
What do small P waves mean?
Peaked P waves (> 0.25 mV) suggest right atrial enlargement, cor pulmonale, (P pulmonale rhythm), but have a low predictive value (~20%). A P wave with increased amplitude can indicate hypokalemia. It can also indicate right atrial enlargement. A P wave with decreased amplitude can indicate hyperkalemia.
What does a short P wave mean?
A short P‐wave duration is a marker of a higher rate of atrial fibrillation recurrences after pulmonary vein isolation procedure.
Why are there no P waves in atrial fibrillation?
Because the atrial rate is so fast, and the action potentials produced are of such low amplitude, P waves will not be seen on the ECG in patients with atrial fibrillation.
What does a short PR interval mean?
A prolonged or shortened PR interval can indicate certain disease. When prolonged, a first degree AV block is present. When shortened, Wolff-Parkinson-White syndrome or Lown-Ganong-Levine syndrome should be suspected.
What is the P wave in the heart?
The P wave indicates atrial depolarization. The P wave occurs when the sinus node, also known as the sinoatrial node, creates an action potential that depolarizes the atria. The P wave should be upright in lead II if the action potential is originating from the SA node.
How can you tell the difference between P waves and T waves?
Complete answer:
| P-Wave | T-Wave |
|---|---|
| ‘P’ wave is the first wave in an ECG and is a positive wave. It indicates the activation of the SA nodes. | ‘T’ wave too is a positive wave and is the final wave in an ECG though sometimes an additional U wave may be seen. It represents ventricular relaxation. |
What heart rhythm has no P wave?
In this tracing, ventricular pacing is evident by absence of an atrial wave (P wave) and the pacemaker spike preceding the QRS complex. Ventricular pacing is used in the presence of bradycardia secondary to AV block or atrial fibrillation.
What happens during T wave?
The T wave represents ventricular repolarization. Generally, the T wave exhibits a positive deflection. The reason for this is that the last cells to depolarize in the ventricles are the first to repolarize.
Why is my T wave so high?
A common cause of abnormally large T-waves is hyperkalemia, which results in high, pointed and asymmetric T-waves. These must be differentiated from hyperacute T-waves seen in the very early phase of myocardial ischemia. Hyperacute T-waves are broad based, high and symmetric.
What causes abnormal T wave?
Primary T-wave abnormalities (ischemia or injury) are due to alterations in myocardial cellular electrophysiology and secondary T-wave abnormalities (bundle branch block or ventricular Hypertrophy) are subsequent to alterations of sequence of ventricular activation.
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.
Should I worry about inverted T waves?
T-wave inversions in right precordial leads are relatively rare in the general population, and are not associated with adverse outcome. Increased mortality risk associated with inverted T waves in other leads may reflect the presence of an underlying structural heart disease.
Can abnormal T waves be normal?
ECG Definitions Isolated T‐wave abnormality was considered present if the T wave was inverted (at least 0.1 mV), isoelectric, or biphasic in leads V3 to V6, aVL, I, and II. In leads V1, aVR and III, T‐wave abnormalities were not evaluated, as those can be found as normal variants.
Can anxiety affect your ECG results?
Premature ventricular contractions is one of the manifestations of sympathetic over activity due to anxiety. However, anxiety might induce electrocardiographic (ECG) changes in normal person with normal heart, as in this documented case.
Can a heart monitor detect anxiety?
“With a heart monitor we can usually determine if it is really a panic attack or an arrhythmia.” One way to determine if what you’re experiencing is atrial fibrillation or anxiety is to understand both sets of symptoms.
What happens if my ECG is abnormal?
An abnormal EKG can mean many things. Sometimes an EKG abnormality is a normal variation of a heart’s rhythm, which does not affect your health. Other times, an abnormal EKG can signal a medical emergency, such as a myocardial infarction (heart attack) or a dangerous arrhythmia.
What is Cardiac Anxiety?
Cardiophobia is defined as an anxiety disorder of persons characterized by repeated complaints of chest pain, heart palpitations, and other somatic sensations accompanied by fears of having a heart attack and of dying.
Can anxiety damage your heart?
People with anxiety disorders have inappropriate ups and downs that can cause high blood pressure, heart rhythm disturbances, or heart attack. A malfunctioning stress response promotes inflammation, which damages the artery linings and sets the stage for the buildup of coronary plaque.