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Related Concept Videos

Electrocardiogram01:29

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...
Dysrhythmias V: Evaluating Dysrhythmias01:30

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...
Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations01:19

Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations

The pathophysiology of Acute Coronary Syndrome [ACD] involves several key processes:The main underlying cause of ACD is atherosclerosis, a chronic inflammatory disease characterized by the buildup of lipid-laden plaques within the coronary arteries.As the atherosclerotic plaque grows in the coronary artery, it may become unstable due to the formation of a lipid-rich core and a thin fibrous cap. Inflammatory cells within the plaque, such as macrophages, secrete enzymes that degrade the...
Acute Coronary Syndrome III: Diagnostic Studies01:30

Acute Coronary Syndrome III: Diagnostic Studies

Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies01:22

Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies

The key clinical manifestations of Rheumatic heart disease (RHD) include several distinct cardiac symptoms.Carditis, a hallmark of acute rheumatic fever, involves inflammation of the heart's endocardium, myocardium, and pericardium. Chronic RHD often results from recurrent episodes of carditis. Its symptoms include the following:Murmurs are caused by valvular damage, especially to the mitral and aortic valves. Mitral stenosis or regurgitation is common, with characteristic heart murmurs...
Pulse rhythm01:30

Pulse rhythm

Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
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High-Throughput Analysis of Optical Mapping Data Using ElectroMap
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T-wave alternans: clinical performance, limitations and analysis methodologies.

Euler V Garcia1, Carlos Alberto Pastore, Nelson Samesima

  • 1Instituto do Coração, Hospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo-SP, Brazil.

Arquivos Brasileiros De Cardiologia
|March 2, 2011
PubMed
Summary
This summary is machine-generated.

Identifying individuals at immediate risk of sudden cardiac death (SCD) remains challenging. T-wave alternans (TWA) shows variable prognostic performance, necessitating further research into its evaluation and influencing factors for improved cardiac risk stratification.

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Area of Science:

  • Cardiology
  • Biomedical Engineering

Background:

  • Sudden cardiac death (SCD) prediction is difficult, as acute events may involve dynamic electrical instability rather than a static substrate.
  • Traditional risk factors and ECG markers have limitations in accurately identifying individuals at immediate risk.

Purpose of the Study:

  • To review the role of T-wave alternans (TWA) in cardiac risk stratification for sudden cardiac death.
  • To highlight the heterogeneity in TWA findings and identify areas for further research.

Main Methods:

  • Review of existing literature on T-wave alternans (TWA) and its application in risk stratification.
  • Discussion of various TWA detection technologies and their technical features.
  • Exploration of factors influencing TWA measurements beyond medication.

Main Results:

  • T-wave alternans (TWA) demonstrates variable prognostic performance across different clinical populations and protocols.
  • Current research presents heterogeneous findings regarding TWA's effectiveness in predicting sudden cardiac death.
  • TWA values are influenced by factors other than pharmacological interventions.

Conclusions:

  • Further investigation into TWA evaluation technologies and influencing factors is crucial for refining its role in cardiac risk stratification.
  • Standardization of TWA measurement protocols may improve its prognostic accuracy.
  • Understanding the dynamic nature of cardiac electrical instability is key to improving sudden cardiac death prediction.