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Tachycardia: Difference between revisions
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===Atrial Tachycardia=== | ===Atrial Tachycardia=== | ||
====Pathophysiology:==== | ====Pathophysiology:==== | ||
Atrial tachycardia is a tachycardia resulting from fast firing in an ectopic focus in the atria. It has a frequency of above the 100bpm. In some patients the tachycardia has multiple foci. This results in different P-wave morphologies on the ECG. The result of firing can be due to all mechanisms of arrhythmias and is dependent on the causes of the atrial tachycardia. | Atrial tachycardia is a tachycardia resulting from fast firing in an ectopic focus or macro-reentry circuit in the atria. It has a frequency of above the 100bpm. In some patients the tachycardia has multiple foci. This results in different P-wave morphologies on the ECG. The result of firing can be due to all mechanisms of arrhythmias and is dependent on the causes of the atrial tachycardia. Patient after earlier surgery or catheter ablation usually present with macro-reentry AT located around functional or anatomical sides of block. The atrial flutter is a type of AT, but due to its unique mechanism it is discussed separably. | ||
====Clinical diagnosis:==== | ====Clinical diagnosis:==== | ||
Atrial tachycardias have a wide clinical presentation. Complaints of palpitation and a fast regular heart rate are common. On the ECG an atrial tachycardia can be detected through the P-wave morphology. The P-wave has an other morpholgy depending on the foci of the atrial tachycardia. A ECG in resting condition can help distinguish different morphologies. When administrating adenosine the AV-conduction blocks and firing from the atrium continues, thereby clearly identifying the atrial source of the tachycardia. | Atrial tachycardias have a wide clinical presentation. Complaints of palpitation and a fast regular heart rate are common. On the ECG an atrial tachycardia can be detected through the P-wave morphology. The P-wave has an other morpholgy depending on the foci of the atrial tachycardia. A ECG in resting condition can help distinguish different morphologies. When administrating adenosine the AV-conduction blocks and firing from the atrium continues, thereby clearly identifying the atrial source of the tachycardia. | ||