F Rate: Normal (60-100 bpm)

k Rhythm: Irregular

H P Waves: At least three different forms, determined by the focus in the atria

| PR Interval: Variable; determined by focus

Multifocal Atrial Tachycardia (MAT)

■ This form of WAP is associated with a ventricular response of >100 bpm.

■ MAT may be confused with atrial fibrillation (A-fib); however, MAT has a visible P wave.

Rate: Fast (>100 bpm) Rhythm: Irregular

P Wave: At least three different forms, determined by the focus in the atria PR Interval: Variable; depends on focus QRS: Normal (0.06-0.10 sec)

y Clinical Tip: MAT is commonly seen in patients with COPD but may also occur in acute MI.

Premature Atrial Contraction (PAC)

■ A single complex occurs earlier than the next expected sinus complex.

■ After the PAC, sinus rhythm usually resumes.

Sinus Rhythm With Pac

Rhythm: Irregular whenever a PAC occurs P Waves: Present; in the PAC, may have a different shape I PR Interval: Varies in the PAC; otherwise normal (0.12-0.20 sec) I QRS: Normal (0.06-0.10 sec)

§ y Clinical Tip: In patients with heart disease, frequent PACs may precede paroxysmal © supraventricular tachycardia (PSVT), A-fib, or A-flutter.

Atrial Tachycardia

■ A rapid atrial rate overrides the SA node and becomes the dominant pacemaker.

■ Some ST wave and T wave abnormalities may be present.

Can Psvt Irregular Pts With Afib

Rate: 150-250 bpm Rhythm: Regular

P Waves: Normal (upright and uniform) but differ in shape from sinus P waves PR Interval: May be short (<0.12 sec) in rapid rates QRS: Normal (0.06-0.10 sec) but can be aberrant at times

Supraventricular Tachycardia (SVT)

■ This arrhythmia has such a fast rate that the P waves may not be seen.

Rate: 150-250 bpm Rhythm: Regular

P Waves: Frequently buried in preceding T waves and difficult to see PR Interval: Usually not possible to measure

QRS: Normal (0.06-0.10 sec) but may be wide if abnormally conducted through ventricles y Clinical Tip: SVT may be related to caffeine intake, nicotine, stress, or anxiety in healthy adults.

Paroxysmal Supraventricular Tachycardia (PSVT)

■ PSVT is a rapid rhythm that starts and stops suddenly.

■ For accurate interpretation, the beginning or end of the PSVT must be seen.

■ PSVT is sometimes called paroxysmal atrial tachycardia (PAT).

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  • Sampsa Vuorela
    Can psvt be irregular in pts with afib?
    9 years ago

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