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Third-Degree (Complete) AV Block

A serious conduction disorder in which electrical conduction from the atria to the ventricles is completely interrupted.

Written by: Saygı Hospital Health Guide Editorial Board
Published:

This content is for general information; please consult your physician for diagnosis and treatment.

References (5)

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What is Third-Degree (Complete) AV Block?

Third-degree (complete) AV block is the most advanced conduction disturbance, in which electrical conduction from the atria to the ventricles is completely interrupted and atrial and ventricular rhythms function independently. Ventricular activity depends on an escape rhythm.

The level of the escape rhythm depends on the block location: a nodal escape (narrow QRS, 40–60 bpm) is relatively stable, whereas an infra-Hisian escape (wide QRS, 20–40 bpm) is unstable and carries a high risk of sudden death. Causes include ischemia, fibrosis, infections, drugs and congenital block.

Diagnosis is made readily from the ECG. In acute symptomatic bradycardia atropine, isoproterenol or temporary pacing may be used; however, permanent pacemaker implantation is the definitive treatment in most cases.

Symptoms

Dizziness and lightheadedness
Syncope and presyncope
Fatigue and weakness
Dyspnea
Chest pain
Confusion (in older adults)
Stokes-Adams attacks

Risk Factors

Advanced age with degenerative conduction fibrosis (Lev, Lenegre disease)
Inferior myocardial infarction
After cardiac surgery
Infective endocarditis
Lyme disease and myocarditis
Digoxin, beta-blocker or calcium channel blocker use
Hereditary conduction disease

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

  • Syncope or near-syncope
  • Sudden markedly slow heart rate
  • Severe fatigue and dyspnea
  • New bradycardia during acute MI
  • Planning for permanent pacemaker

Treatment Methods

01
Atropine or isoproterenol in hemodynamic compromise
02
Temporary transcutaneous or transvenous pacing
03
Correction of drug toxicity
04
Early reperfusion for ischemic causes
05
Permanent pacemaker implantation
06
Regular device interrogation

Which Department to Visit?

You can visit our Kardiyoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.