Is Ventricular Bigeminy Benign? Which Patients Need treatment?

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Introduction

What do you do with the patient that has ventricular bigeminy? Is it benign? Do we need to spring into action?

A 76 yo woman presents to the Emergency Department/ is on the ward/ comes to your rooms, and is complaining of palpitations. She states that they sometimes make her dizzy.

You perform an ECG, the rhythm strip is shown below. What do you do?

The patient is in Ventricular Bigeminy.

Bigeminy comes for the latin for ‘twins’. On an ECG strip, it presents as a sinus beat with a premature ventricular complex immediately following. This extra beat is wide and abnormal as it bypasses the normal conduction system(His-Purkinje) and directly activates the ventricles. Most have a left bundle branch block morphology and come from the right ventricular outflow tract. There is usually no p wave. Following this wide bizarre beat there is a compensatory pause, usually meaning that the next beat arrives at 2 x the normal RR interval.

TERMINOLOGY/CLASSIFICATION

Ventricular Bigeminy = A ectopic beat every second beat
Ventricular Trigeminy = An ectopic beat every third bead
Ventricular Quadrigeminy = An ectopic beat every fourth beat.

Ectopic beats can be both ventricular and atrial. In atrial bigeminy, each normal beat is followed by a premature beat.

Classification can be according to the frequency; i.e.., > 10/hr or 6/minute are very frequent, or to their clinical significance; i.e.., benign or potentially malignant. Formal classifications such as the Lown classification are not frequently used.

WHAT CAUSES THEM?

  • Sympathetic drivers such as ; anxiety, caffeine
  • beta agonists
  • hypokalaemia
  • hypomanesaemia
  • Digoxin toxicity
  • Ischaemia ( this is an important cause not to forget)

HOW IMPORTANT ARE THEY?

We normally don’t need to do anything for these patients, as ectopics are a normal physiological response. However:

  1. In patients with ischaemic heart disease, these may be significant and caused by the ischaemia. Beware the multiple premature ventricular ectopics in MI.
  2. Beware premature ventricular contractions(PVC’s) and Long QTc as this may predispose to R on T phenomenon. The premature complex may fall on the T wave resulting in Torsades de Pointes.

INVESTIGATIONS

These are straightforward:

  1. Look for electrolyte disturbances.
  2. Perform a troponin, in case there is ischaemia.
  3. In patients being discharged, an exercise stress test may be appropriate as it may show increased PVC’s with ischaemia.
  4. An ECHO specifically looking at left ventricular function is important as, there is increased risk in those with an ejection fraction < 40%

MANAGEMENT

In asymptomatic patients with an incidental finding, do nothing. Give advice on coffee consumption, energy drinks etc.

In symptomatic patients:

If Normal left ventricular function and no known coronary artery disease:

  • Consider a beta blocker such as Metoprolol

In those patients with heart disease e.g. post myocardial infarction

  • Invasive strategies may be needed if > 2 of the following are present:
    • LVEF < 40%
    • Ventricular late potentials
    • Repetitive VPC’s

Therefore, Ventricular Bigeminy, although for the most part is benign, it may potentially lead to significant arrhythmias.

Peter Kas

Dr Peter Kas

Emergency Physician, Educator. Key Interests: Resuscitation, Airway, Emergency Cardiology, Clinical Examination. Creator resus.com.au.

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  1. SylviaB on 15/08/2016 at 9:47 am

    In this case it looks like there is some ST elevation in both the sinus beats and the ventricular beats (Sgarbossa criteria), hard to be sure wihtout a grid present though

    • Resus on 15/08/2016 at 6:15 pm

      Thanks Sylvia
      I agree, there is ST elevation in the normal beats. I’m not sure that you can apply Sgarbossa to ectopics however.

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