Determining the Regularity of an ECG/EKG Rhythm - [ Ссылка ]
Determining the heart rate in an EKG rhythm tracing using 3 methods - [ Ссылка ] Identifying and describing P waves in an EKG rhythm - [ Ссылка ]
Identifying and Measuring the PR Interval in an EKG Rhythm Strip - [ Ссылка ] Describing and measuring the QRS complex in an EKG rhythm strip - [ Ссылка ]
How to analyze an EKG rhythm strip in 6 steps - [ Ссылка ]
Portable ECG Monitor: [ Ссылка ]
KardiaMobile Smart Phone EKG: [ Ссылка ]
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Third-degree heart block, also known as complete heart block, is a type of cardiac conduction disorder in which there is no transmission of electrical impulses from the atria to the ventricles. This results in a complete dissociation between the atria and the ventricles, causing them to beat independently of each other.
In third-degree heart block, the atria and ventricles are paced by separate electrical systems. The atria are paced by the sinoatrial (SA) node, which generates electrical impulses at a regular rate of around 60-100 beats per minute. The ventricles, on the other hand, are paced by a secondary pacemaker located in the bundle of His or the ventricular conduction system, which generates impulses at a slower rate of around 30-40 beats per minute.
As a result of this dissociation, the QRS complexes on an electrocardiogram (ECG) will appear at a slower rate than the P waves, and there will be no relationship between them. The P waves may be absent or may appear at a different rate than the QRS complexes, depending on the underlying cause of the block.
Third-degree heart block is most commonly caused by damage to the conduction system of the heart, such as in cases of myocardial infarction, degenerative diseases, or inflammation of the heart muscle.
Other causes include medication side effects, electrolyte imbalances, or congenital heart defects.
Symptoms of third-degree heart block may include dizziness, fainting, chest pain, and shortness of breath.
Treatment options include implantation of a pacemaker to regulate the heart rate and rhythm. Without treatment, third-degree heart block can lead to serious complications such as heart failure, stroke, or sudden cardiac arrest.
In conclusion, analyzing an EKG tracing of third-degree heart block requires identifying the heart rate, P waves, QRS complexes, PR interval, and QRS duration. Identifying these features will help in diagnosing and treating the underlying cause of third-degree heart block. Thank you for watching this video. We hope you found it helpful. Please like and subscribe to our channel for more informative videos on health topics.
