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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

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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...
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Electrocardiogram Fundamentals01:28

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Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
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Dysrhythmias V: Evaluating Dysrhythmias01:30

Dysrhythmias V: Evaluating Dysrhythmias

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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...
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Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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Dysrhythmias, also known as arrhythmias, are irregular heart rhythms that result from abnormal electrical activity in the heart, affecting its ability to circulate blood efficiently. Tachyarrhythmias, a subset of dysrhythmias, are characterized by abnormally fast heart rates exceeding 100 beats per minute. Here are some types of tachyarrhythmias with their distinct ECG features:Sinus Tachycardia:Sinus tachycardia presents a regular heart rhythm with an increased rate of 101-180 beats per...
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Dysrhythmias IV: Characteristics of Bradyarrhythmias01:18

Dysrhythmias IV: Characteristics of Bradyarrhythmias

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Bradyarrhythmias are cardiac rhythm disorders characterized by a slower-than-normal heart rate, typically defined as fewer than 60 beats per minute. Some of which are discussed here:Sinus BradycardiaSinus bradycardia presents a heart rate lower than 60 beats per minute, with a regular rhythm originating from the SA node. The ECG typically shows normal P waves preceding each QRS complex, a normal PR interval (0.12 to 0.20 seconds), and a normal QRS duration (0.06 to 0.10 seconds).First-Degree AV...
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Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations01:19

Acute Coronary Syndrome II: Pathophysiology and Clinical Manifestations

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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...
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Dynamic ST-Segment Abnormality.

Elias B Hanna1, Paul A LeLorier1, D Luke Glancy1

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Summary

Chest pain can mimic heart attack due to Wolff-Parkinson-White syndrome. This condition causes intermittent ventricular pre-excitation, leading to ECG changes that can be mistaken for myocardial infarction.

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Area of Science:

  • Cardiology
  • Electrophysiology

Background:

  • Intermittent chest pain is a common presenting complaint in emergency departments.
  • Electrocardiogram (ECG) interpretation is critical for diagnosing acute cardiac events, particularly ST-segment elevation myocardial infarction (STEMI).

Observation:

  • A 37-year-old male presented with chest pain, and initial ECG showed sinus rhythm with left atrial/ventricular enlargement and early repolarization.
  • A subsequent ECG revealed significant ST-segment elevation and upright T waves in anterior leads, mimicking STEMI.
  • The patient's symptoms and ECG changes were ultimately attributed to intermittent ventricular pre-excitation characteristic of Wolff-Parkinson-White (WPW) syndrome.

Findings:

  • The ECG findings suggestive of myocardial infarction were a false positive.
  • No electrocardiographic, echocardiographic, or serum markers of myocardial infarction were identified.
  • The critical finding was intermittent ventricular pre-excitation due to WPW syndrome.

Implications:

  • This case highlights the importance of careful ECG review to differentiate WPW-related changes from acute myocardial infarction.
  • Misdiagnosis can lead to unnecessary activation of cardiac catheterization teams and invasive procedures.
  • Awareness of WPW syndrome's ECG manifestations is crucial for accurate diagnosis and appropriate patient management.