Define MAT(multifocal atrial tachycardia) including ECG findings.What is Atrial premature contraction?

DEfine Multifocal Atrial tachycardia&atrial premature contraction.Explain ECG findings(both of them) in simpleway.

Multifocal atrial tachycardia (MAT) is an irregular cardiac rhythm caused by at least 2 different sites of competing atrial activity.
ECG findings showan irregular rapid tachycardia, usually narrow-complex.
It is often confused with atrial flutter or fibrillation.
It usually does not cause hemodynamic instability

It is usually caused by hypoxia in the elderly with other resp. conditions. It usually resolves itself once the hypoxia is corrected.

Hope this helps.

A premature atrial contraction means that the impulse to cause the beat started somewhere in the right atrium of the heart, but not in the SA node. It may have a smaller PRI interval on the ECG and will come earlier in the cardiac cycle.

Multifocal means originates from several points, atrial tachycardia means the atria are pumping faster than normal. A premature atrial contraction is when the atria pump before they have completely filled with blood.
RN

Premature atrial contractions are exactly that. The impulse that starts the contraction originates from an atrial focus rather than from the sino-atrial node. Since AV conduction is usually normal, the QRS is usually narrow (but not always).
MFAT, by extension, has the origin in multiple atrial sites, and P wave morphology as well as PR intervals may vary somewhat from beat to beat. Seen most often in advanced COPD, it's a pretty benign rhythm.

In a normal heart, electrical current travels from one node to the next causing the typical ekg tracing of a P wave (atrial depolarization), QRS complex (ventrical depole) and the T wave (ventrical repolarization). Depolarization is followed by heart contractions. First atrial, then ventrical.
In Multifocal Atrial Tachycardia, the atria are beating more often then the ventricles (so not every atrial contraction is followed by a ventricle contraction) Typically the atrial beats in MAT are greater then one hundred. These beats are charecterized by multiple p waves on the EKG strip that do not fit into the usual pattern of normal heart electrical activity. In addition, there are usually 3+ different shaped p waves. This goes back to the "multifocal" part of MAT, meaning that the initiation of these contractions come from various parts of the atria that are abnormally excited, not just from the SA node. Each different area that causes depolarization, has a different shaped P. This is one way you can distinguish it from Premature atrial contractions "PAC's"
PAC's occur during a normal sinus rhthym. The extra atrial contraction, like in MAT also comes from some other area of the atria besides the sinus node, and may occur infrequently so as not to cause atrial tachycardia. On an EKG strip, this is visualized as an extra p wave that also has a different shape then the usual p, and that interrupts the normal sinus rhythm. It may be seen on top of the T wave, causing it to be taller then the usual t and possibly notched.