What does short PR interval indicate?

What does short PR interval indicate?

A prolonged PR interval indicates delayed conduction of the sinoatrial, or SA, nodal impulse to the ventricles and is called first-degree AV block. A short PR interval can be seen when the AV node delay is bypassed, such as in Wolff-Parkinson-White syndrome or Lown-Ganong-Levine syndrome.

Is a short PR interval bad?

When its length is lesser than 0.120 seconds, we speak as a short PR-interval. This event has a great capacity for severe cardiac arrhythmia production. Both entities can be very dangerous, separately. When they are together in the same individual, the consequences could be deadly.

What causes short PR syndrome?

A short PR interval (of less than 120ms) may be associated with a Pre-excitation syndromes such as Wolff–Parkinson–White syndrome or Lown–Ganong–Levine syndrome, and also junctional arrhythmia like atrioventricular reentrant tachycardia or junctional rhythm.

What does abnormal 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 would happen if the PR interval is too short?

Furthermore, compared with patients with a normal PR interval, patients with a short PR interval had more heart failure, longer QRS, and QTc duration, all known to be associated with worse prognosis.

Can a short PR interval be benign?

A short PR interval found incidentally on an ECG without episodes of tachycardia is simply a benign ECG variant. LGL can be distinguished from WPW syndrome because the delta waves seen in WPW syndrome are not seen in LGL syndrome.

What does PR interval tell you?

The PR interval is the time from the beginning of the P wave (atrial depolarization) to the beginning of the QRS complex (ventricular depolarization). The normal PR interval measures 0.12-0.20 seconds (120-200 milliseconds). A prolonged or shortened PR interval can indicate certain disease.

Is it normal to have a short PR interval?

Although a short PR interval may be a normal variant, it is also associated with the presence of an accessory bypass tract (e.g. WPW syndrome and LGL syndrome ), and close proximity of the atrial impulse to the AV node such as occurs in a premature atrial beat.

What causes a short PR interval in WPW syndrome?

Short PR interval in WPW syndrome results from an accessory pathway, the bundle of Kent, that directly connects the atria to the ventricles bypassing the AV node.

Are there patients with short P-R interval normal QRS complex?

There are a considerable number of patients who have a short P-R interval, normal QRS complex and bouts of tachycardia. They are usually females, in middle life, devoid of organic heart disease and exhibit a snapping apical first heart sound.

What does short PR interval and delta wave mean?

Wolff-Parkinson-White (WPW) Syndrome: Short PR interval, normal P wave, delta wave resulting in a wide QRS complex. Coronary sinus rhythm (low atrial rhythm): P wave is negative in leads II, III and aVF. (in some patients with) Fabry disease . (in some patients with) Pompe’s disease.