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4.3.1Premature heart beat (extrasystole) 4.3.1.1Premature supraventricular (atrial and junctional) contraction
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Источник: секс шоп.

4.3.1Premature heart beat (extrasystole) 4.3.1.1Premature supraventricular (atrial and junctional) contraction

Premature atrial contractions are a type of premature heart beat, irregular heart beat or benign arrhythmia which starts in the upper two chambers of the heart. In many cases doctors are unable to determine a cause. Some cells in the heart (ectopic foci) start to fire or go off before the normal heart beat is supposed to occur in the SA node. These can be cells that are damaged or sick from a virus, or from some other cause that a doctor can't determine, many times, doctors don't know why they happen.

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Figure 26 — Premature atrial contraction

Sometimes people who have them feel a skipped beat or a thump in their chest or neck. In many cases, the person feels nothing.

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Figure 27 — Premature junctional contraction

ECG signs of premature junctional contraction:

Irregular rhythm as a result of extrasystole beats.

Atrial and ventricular rates vary with the underlying rhythm.

P wave is premature and abnormally shaped, often lost in the previous T wave. In case of junctional premature contractions P wave is absent.

Normal QRS duration but shape is deformed.

QT interval is in normal length.

After premature complex the pause (so-called incomplete compensatory) is present.



Источник: секс шоп.
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