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Dysrhythmias V: Evaluating Dysrhythmias

Dysrhythmias V: Evaluating Dysrhythmias

Dysrhythmias, also known as arrhythmias, are disturbances in the heart's rhythm that range from benign to life-threatening. A thorough evaluation is crucial for appropriate management and involves a comprehensive medical history, physical examination, and various diagnostic tests.Medical HistorySymptoms: Collect detailed information on palpitations, dizziness, syncope, chest pain, and fatigue. Note their onset, frequency, and triggers.Previous Cardiac Issues: Document any history of heart...

Mechanism of Cardiac Arrhythmias

Mechanism of Cardiac Arrhythmias

Arrhythmias are irregular heart rhythms occurring when the heart's electrical impulses become abnormal. These disturbances can lead to various symptoms, depending on their severity and the underlying cause. Some common factors contributing to arrhythmias include hypoxia, ischemia, electrolyte imbalances, excessive catecholamine exposure, drug toxicity, and muscle overstretching. Arrhythmias can be classified into two main types based on the rate and site of origin of abnormal heart rhythms.

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias

Arrhythmia is a condition characterized by an irregular heart rhythm, with ECG changes that differ based on its origin and nature. The types of arrhythmias discussed below include atrial, junctional, and ventricular arrhythmias.Atrial ArrhythmiasPremature Atrial Complexes (PACs): PACs are early atrial beats caused by stress, caffeine, alcohol, electrolyte imbalances, hypoxia, hyperthyroidism, or certain medications (e.g., bronchodilators and decongestants). The ECG shows early P waves with an...

Dysrhythmias II: Classification of Tachyarrhythmias

Dysrhythmias II: Classification of Tachyarrhythmias

Tachyarrhythmias are a type of dysrhythmia where the heart rate exceeds 100 beats per minute. Here are some common types of tachyarrhythmias:Sinus TachycardiaSinus tachycardia originates from increased impulses from the sinus node, leading to an elevated heart rate. It is often triggered by stress, fever, or exercise.Patients may experience palpitations, a sensation of a racing heart, dizziness, and chest discomfort.Causes and Risk Factors: Common causes include physical exertion, emotional...

Disturbances in Heart Rhythm

Disturbances in Heart Rhythm

Arrhythmia or dysrhythmia refers to an abnormal heart rhythm caused by a defect in the heart's conduction system. It can cause the heart to beat irregularly, too quickly, or too slowly, leading to symptoms like chest pain, shortness of breath, and fainting. Factors such as stress, caffeine, alcohol, nicotine, cocaine, certain drugs, congenital defects, diseases, and electrolyte abnormalities can trigger arrhythmias.
Arrhythmias are categorized by their speed, rhythm, and origin. A slow heart...

Electrocardiogram

Electrocardiogram

An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and the T...

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Electrophysiological Assessment of Murine Atria with High-Resolution Optical Mapping

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[Diagnostic approach in complex arrhythmias].

¹Medizinischen Klinik II, Schwerpunkt Kardiologie und Internistische Intensivmedizin, St. Vincenz-Krankenhaus, Akademisches Lehrkrankenhaus, Universität Göttingen, Am Busdorf 2, 33098, Paderborn, Deustchland. t.lewalter@vincenz.de

Herzschrittmachertherapie & Elektrophysiologie

|May 8, 2009

Summary

Accurate diagnosis of complex arrhythmias relies on understanding their mechanisms. This involves detailed electrophysiological analysis for precise identification and treatment of various tachycardia types.

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Area of Science:

Cardiology
Electrophysiology
Cardiac Electrophysiology

Context:

Complex arrhythmias pose diagnostic challenges.
Dilated cardiomyopathy and sinus tachycardia can mimic other arrhythmias.
Pre-existing left bundle branch block complicates tachycardia interpretation.

Purpose:

To highlight the importance of precise arrhythmia mechanism knowledge for diagnosis.
To illustrate diagnostic approaches for challenging tachycardia cases.
To present case studies demonstrating successful arrhythmia management.

Summary:

Case studies demonstrate diagnosing left atrial tachycardia from coronary sinus electrograms.
An unusual presentation of atrioventricular nodal re-entrant tachycardia was identified via His bundle electrogram analysis.
Epicardial access was crucial for ablating a broad complex tachycardia in coronary heart disease.
Left atrial perimitral atrial flutter post-pulmonary vein ablation presents a clinical challenge.

Impact:

Improved diagnostic accuracy for complex cardiac arrhythmias.
Enhanced understanding of tachycardia mechanisms in specific patient populations.
Guidance for interventional strategies in challenging electrophysiological cases.