Abnormal Heart Rhythms (Heart Rhythm Disorders) Symptoms, Causes, Treatment - Atrial Flutter on MedicineNet

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February 10, 2012

Heart Rhythm Disorders (cont.)

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Atrial flutter

Atrial flutter is similar to atrial fibrillation except that instead of having chaotic electrical firing from all points in the atrium, one point has become irritated and can fire 300 times per minute or more. The issues that exist for atrial fibrillation apply to atrial flutter. Atrial flutter may degenerate into atrial fibrillation.

Bradycardia

Aside from medications that are meant to slow the heart for treatment of a variety of medical problems, bradycardia (brady=slow + cardia=heart) is usually due to heart block and the aging of the electrical wiring of the heart. This is no different than the aging of your home's electrical system, but instead of being able to rewire the heart; these conditions may need to be treated with an implantable pacemaker.

Heart blocks

Heart blocks involving the ventricle may be asymptomatic and of little consequence except to point to underlying heart or lung disease. They are diagnosed by EKG.

Heart blocks involving the atrium can be classified as first, second, and third degree.

  • First degree heart block is common and of little significance. There is a slight delay in getting the electrical signal from the SA node to the AV node, but the heart functions normally.

  • There are two types of second degree heart block (Mobitz I and Mobitz II) but only the Mobitz II type can be a precursor to a life threatening rhythm problem.

  • Third degree heart block describes the complete loss of connection between the electrical activity of the atrium and the ventricle. Second and third degree heart blocks are diagnosed by analyzing heart rhythm strips and EKGs.

Heart blocks are symptomatic because the heart beats so slowly that cardiac output is decreased. The symptoms may include lightheadedness or passing out (syncope), weakness, shortness of breath, and chest pain.

Diagnosis and treatment of life-threatening heart block happen at the same time. Often a temporary pacemaker may be placed to stabilize the patient, and then decisions are made as to what type of permanent solution is appropriate.


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