Electrocardiography

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The heartbeat is controlled by the electrical system of the heart. This system is made of several parts that tell the muscle of the heart when to contract. The SA node starts the heartbeat causing the atria, or upper chambers of the heart, to contract. The signal then travels through..

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Sudden cardiac arrest (SCA) is an event caused by a problem with the heart’s “electrical” system. SCA occurs when the heart suddenly stops beating. The heart’s electrical system sends signals to the heart to beat much too fast. The heart cannot beat that fast, so the heart muscle just quivers. Blood..

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Supraventricular Tachycardias include a group of heart arrhythmias, or irregular heartbeats that originate in the atria. In each of these conditions, electrical signals begin in the atria, sending abnormal signals to the ventricles. These irregular heartbeats can be seen on an Electrocardiogram or ECG. SVTs include several different types of..

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Overdrive Suppression We have here in Figure 1 what is most likely an AV nodal reentrant tachycardia (AVNRT). Could it possibly be an AV reentrant tachycardia with orthodromic conduction through an accessory pathway? Possibly. Could it be an atrial tachycardia with the P wave hidden in the preceding T wave?..

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Often we come upon pauses on 12-lead ECGs and rhythm strips. Some of these pauses have durations that we are simply unable to justify while others are easier to comprehend. In this article I want to discuss how to better understand these pauses. [pdf-embedder url="https://perfusfind.com/wp-content/uploads/2021/11/Pauses-and-Their-Connection-to-the-P-P-Intervals-1_compressed.pdf" title="Pauses and Their Connection to..

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Abstract Cardiac amyloidosis (CA) is an infiltrative cardiomyopathy caused by the extracellular deposition of amyloid fibrils in the myocardium. Although cardiac amyloidosis patients primarily present with heart failure symptoms, arrhythmias and conduction system disease are frequently encountered. Atrial fibrillation (AF) is observed in up to 70% of patients at the..

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One of the first things I try to teach the participants in my classes is the meaning of the term atrioventricular block – commonly abbreviated as “AV block.” So many people try to equate that term with the AV node. That is understandable since they both contain the letters “AV.”..