2nd degree AV block, type I (Wenckebach).Some aberrant impulses cause normal variants of the heart rhythm and others can be potentially life threatening. There can also be delays in transmission of the electrical impulse anywhere in the system, including the SA node, the atria, the AV node, or in the ventricles. Rhythm strip showing a normal 12-lead ECG. Examples of heart rhythms include: Some electrical rhythms do not generate a heartbeat and are the cause of sudden death. There are a variety of abnormal electrical rhythms, some are normal variants and some are potentially dangerous. Normally, the heart beats in a sinus rhythm with each electrical impulse generated by the SA node resulting in a ventricular contraction, or heartbeat. Tachycardia (tachy=fast+cardia=heart) describes a heart rate faster than 100 beats per minute. Bradycardia (brady=slow+cardia=heart) describes a heart rate less than 50 beats per minute.
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Normally, the SA node generates an electrical impulse 50-100 times per minute. By interpreting the tracing, the physician can learn about the heart rate and rhythm as well as blood flow to the ventricles (indirectly). Multiple leads provide many electrical views of the heart. How are EKG (Wave Strips) Used to Evaluate Heart Function?Įlectrode leads on the chest wall are able to detect electrical impulses that are generated by the heart. QUESTION In the U.S., 1 in every 4 deaths is caused by heart disease.
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This blood supplies organs and cells with oxygen and nutrients necessary for metabolism.
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A heart monitor only measures the rate and rhythm of the heartbeat.By comparison, a heart monitor requires only three electrode leads – one each on the right arm, left arm, and left chest.The printed view of these recordings is the electrocardiogram.The signals received from each electrode are recorded.An electrode lead, or patch, is placed on each arm and leg and six are placed across the chest wall.Ten electrodes are needed to produce 12 electrical views of the heart.A standardized system has been developed for the electrode placement for a routine ECG.The electrocardiogram can measure the rate and rhythm of the heartbeat, as well as provide indirect evidence of blood flow to the heart muscle.The heart is a two stage electrical pump and the heart's electrical activity can be measured by electrodes placed on the skin.Numerous textbooks are devoted to the subject. While it is a relatively simple test to perform, the interpretation of the ECG tracing requires significant amounts of training. The electrocardiogram (ECG or EKG) is a diagnostic tool that is routinely used to assess the electrical and muscular functions of the heart. Picture of the basic anatomy of the heart