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(Atrioventricular [AV] Block—Child)
- First-degree heart block—mildest form of heart block. Electrical signals reach all parts of the heart but move more slowly than normal. There are usually no symptoms, and heartbeat is normal.
- Second-degree heart block—some of the electrical signals are not reaching the ventricles. This means sometimes the ventricles do not pump when they should.
- Third-degree, or complete, heart block—most serious type of heart block. No electrical signals are able to reach the ventricles. Cells in the ventricles act as a back up and create their own electrical signals. This allows the ventricles to keep pumping but it is slower and out of rhythm with the rest of the heart. .
|Anatomy of the Heart|
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- Heart defect caused by genetics
- Certain medications
- Damage from surgery
- Infections such as Lyme disease
- Lupus in the mother
- Electrolyte abnormalities
- Autoimmune disorder
- Previous heart problems like heart failure or heart attack
- Heart valve problems
- Certain medications
- Exposure to toxic substances
- Dizziness or light-headedness
- Fainting (syncope)
- Chest pain
- Shortness of breath
- Slow heart beat
- Weakness or fatigue
- Child has trouble keeping up with other children when playing
- Child has “spells” during play and needs to sit down and rest
American College of Cardiology http://www.cardiosource.org
American Heart Association http://www.americanheart.org/
Heart Rhythm Society http://www.hrsonline.org/
Canadian Cardiovascular Society http://www.ccs.ca/
Heart and Stroke Foundation of Canada http://ww2.heartandstroke.ca
First-degree AV nodal block. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed/what.php . Updated June 14, 2013. Accessed June 20, 2013.
Heart block. Heart Rhythm Society website. Available at: http://www.hrsonline.org/Patient-Resources/Heart-Diseases-Disorders/Heart-Block . Accessed on June 20, 2013.
Second degree atrioventricular nodal block (non-Wenckebach). EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed/what.php . Updated April 18, 2013. Accessed June 20, 2013.
Third degree atrioventricular nodal block. EBSCO DynaMed website. Available at: http://www.ebscohost.com/dynamed/what.php . Updated January 21, 2011. Accessed June 20, 2013.
University of California San Francisco. Heart block. UCSF Benioff Childrens’ Hospital website. Available at: http://www.ucsfchildrenshospital.org/conditions/heart%5Fblock/ . Accessed on June 20, 2013.
What is heart block? National Heart, Lung and Blood Institute website. Available at: http://www.nhlbi.nih.gov/health/health-topics/topics/hb/ . Accessed on June 20, 2013.
- Reviewer: Kari Kassir, MD
- Review Date: 12/2013
- Update Date: 01/14/2014