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Related Concept Videos

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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Mechanism of Cardiac Arrhythmias01:28

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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.
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Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

Cardiomyopathy III: Hypertrophic Cardiomyopathy

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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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Cardiovascular System Abnormal Findings II: Auscultation01:25

Cardiovascular System Abnormal Findings II: Auscultation

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Auscultation, an essential part of a heart examination, is done using a stethoscope. It provides crucial information about heart function and possible heart problems. Due to heart problems, abnormal sounds can be heard during systole or diastole. These sounds include S3 and S4 gallops, opening snaps, systolic clicks, and murmurs.
Abnormal Heart Sounds
Gallops:
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Cardiovascular System Abnormal Findings I: Inspection and Palpation01:29

Cardiovascular System Abnormal Findings I: Inspection and Palpation

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In a cardiovascular examination, inspection and palpation are crucial for identifying abnormalities.
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Related Experiment Video

Updated: Jan 7, 2026

Identification of Neutrophil Extracellular Traps in Paraffin-Embedded Feline Arterial Thrombi using Immunofluorescence Microscopy
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Cardiac Abnormalities in Feline Hyperthyroidism.

Birgit van Zuiden1, Giorgia Santarelli1, Sara Galac1

  • 1Clinical Sciences, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 108, 3584 CM Utrecht, The Netherlands.

Veterinary Sciences
|December 31, 2025
PubMed
Summary

Hyperthyroidism in older cats commonly causes heart issues like cardiomegaly. Treatment to normalize thyroid hormone levels often reverses these cardiac changes, preventing heart failure.

Keywords:
NT-proBNPcatsdyspneaechocardiographyheart failurehypertrophic cardiomyopathypleural effusionpulmonary edema

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Area of Science:

  • Veterinary Medicine
  • Endocrinology
  • Cardiology

Background:

  • Hyperthyroidism is a prevalent endocrine disorder in aging feline populations.
  • This condition frequently leads to secondary cardiac abnormalities, impacting long-term health.
  • Understanding these cardiac changes and treatment effects is vital for feline patient management.

Purpose of the Study:

  • To investigate the cardiac abnormalities associated with hyperthyroidism in cats.
  • To evaluate the reversibility of these cardiac changes following treatment.
  • To establish optimal monitoring and screening protocols for affected cats.

Main Methods:

  • Review of echocardiographic findings in hyperthyroid cats.
  • Analysis of cardiac structure and function before and after treatment.
  • Correlation of thyroid hormone levels with cardiac status.

Main Results:

  • Hyperthyroid cats commonly exhibit cardiomegaly, left ventricular hypertrophy, and left atrial dilation.
  • Cardiac abnormalities are often reversible with normalized thyroid hormone levels.
  • Pre-existing conditions like hypertrophic cardiomyopathy may impede full cardiac recovery.

Conclusions:

  • Routine echocardiography is recommended for monitoring cardiac changes in hyperthyroid cats.
  • Screening older cats with heart disease for hyperthyroidism is crucial.
  • Effective treatment of hyperthyroidism can prevent the development of heart failure.