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Related Concept Videos

Disturbances in Heart Rhythm01:29

Disturbances in Heart Rhythm

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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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Dysrhythmias III: Characteristics of Dysrhythmias01:29

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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

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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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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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Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

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Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
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ECG Interpretation of Arrhythmias II: Atrial, Junctional and Ventricular Arrhythmias01:25

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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...
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Related Experiment Video

Updated: May 6, 2026

Microelectrode Array Recording of Sinoatrial Node Firing Rate to Identify Intrinsic Cardiac Pacemaking Defects in Mice
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Arrhythmia profile in acromegaly.

G Kahaly1, K V Olshausen, S Mohr-Kahaly

  • 1IIIrd. Department of Medicine, Johannes Gutenberg-University Hospital, Mainz, Germany.

European Heart Journal
|January 1, 1992
PubMed
Summary
This summary is machine-generated.

Acromegaly patients exhibit significantly more ventricular arrhythmias and left ventricular hypertrophy than controls. Disease duration, not hormone levels, correlates with these cardiac changes.

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Area of Science:

  • Cardiology
  • Endocrinology
  • Internal Medicine

Background:

  • Acromegaly, a condition of excess growth hormone, is associated with cardiovascular complications.
  • Cardiac involvement in acromegaly requires further investigation regarding arrhythmia profiles.

Purpose of the Study:

  • To correlate cardiac involvement and arrhythmia patterns in acromegaly patients with endocrine parameters, clinical scores, and disease duration.
  • To compare the cardiac and arrhythmia profiles of acromegaly patients with a healthy control group.

Main Methods:

  • Controlled study involving 32 acromegaly patients and 50 controls.
  • Cardiac assessment included stress electrocardiography (ECG), 24-hour Holter monitoring, and echocardiography.
  • Correlation analysis with endocrine parameters (somatomedin C, growth hormone), clinical score, and disease duration.

Main Results:

  • Acromegaly patients showed significantly higher prevalence and severity of ventricular arrhythmias compared to controls (P < 0.01).
  • Complex ventricular arrhythmias (Lown III-IV) were observed in 48% of acromegaly patients versus 12% of controls.
  • Left ventricular mass was significantly increased due to concentric hypertrophy, correlating with arrhythmia severity and clinical activity score (P < 0.01).

Conclusions:

  • Acromegaly patients exhibit a higher burden of ventricular arrhythmias and left ventricular hypertrophy.
  • Disease duration, rather than current hormone levels, appears to be a key factor in the development of these cardiac abnormalities.