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Related Concept Videos

ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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...
Hyperthyroidism II: Pathophysiology01:27

Hyperthyroidism II: Pathophysiology

Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
Graves Disease II: Pathophysiology01:24

Graves Disease II: Pathophysiology

Graves’ disease is an autoimmune disorder characterized by the production of thyroid-stimulating immunoglobulins (TSI) that activate TSH receptors, leading to excessive synthesis and release of thyroid hormones (T3 and T4) and resulting in hyperthyroidism.Among all causes of hyperthyroidism, Graves’ disease is the most common and can happen at any age, though it is more frequent in women. It produces a hypermetabolic state with features such as weight loss, tachycardia, tremor, and heat...
Dysrhythmias III: Characteristics of Dysrhythmias01:29

Dysrhythmias III: Characteristics of Dysrhythmias

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 minute.
Dysrhythmias II: Classification of Tachyarrhythmias01:28

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 Rhythm01:29

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...

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Catheter Ablation in Combination With Left Atrial Appendage Closure for Atrial Fibrillation
28:13

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Published on: February 26, 2013

Atrial fibrillation from thyroid storm.

Gabriel J Martinez-Diaz1, Carl Formaker, Renee Hsia

  • 1University of California-San Francisco, San Francisco, California 94110, USA.

The Journal of Emergency Medicine
|December 23, 2008
PubMed
Summary

Thyroid storm, a rare but serious hyperthyroid state, can present with symptoms mimicking drug intoxication. Early consideration of thyrotoxic crisis in emergency departments is crucial for timely diagnosis and management.

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Last Updated: Jun 27, 2026

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Published on: July 29, 2011

Area of Science:

  • Endocrinology
  • Emergency Medicine

Background:

  • Thyroid storm is a rare but critical hyperthyroid condition.
  • It can lead to severe illness or death if not promptly managed.
  • Patients may present with vague symptoms, complicating initial diagnosis.

Observation:

  • Thyroid storm symptoms include tachycardia, hyperpyrexia, agitation, and altered mental status.
  • These signs can be mistaken for drug intoxication in emergency settings.
  • A case of thyrotoxic crisis initially presenting as general malaise is detailed.

Findings:

  • Thyrotoxic crisis can be the initial presentation of hyperthyroidism.
  • Vague symptoms can mask a serious underlying endocrine emergency.
  • Even with standard treatments, patients may experience decompensation.

Implications:

  • Thyrotoxic crisis must be included in the differential diagnosis for patients with relevant symptoms.
  • Awareness of this condition is vital for emergency department physicians.
  • Prompt recognition and management are essential to prevent severe outcomes.