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[The effect of hypothyroidism on cardiac function in dogs]
I Stephan1, I Nolte, H O Hoppen
1Klinik für kleine Haustiere der Tierärztlichen Hochschule Hannover, Zentrumsabteilung für chemische Analytik und Endokrinologie der Tierärztlichen Hochschule Hannover.
DTW. Deutsche Tierarztliche Wochenschrift
|July 18, 2003
Summary
Hypothyroidism in dogs can cause heart problems like low heart rates and reduced heart function. Treatment with levothyroxine improved cardiac function and heart rates in hypothyroid dogs.
Area of Science:
- Veterinary Cardiology
- Endocrinology
Background:
- Thyroid hormones significantly influence cardiac function.
- Hypothyroidism may lead to impaired left ventricular function.
Observation:
- Cardiac findings were evaluated in ten hypothyroid dogs using auscultation, electrocardiography (ECG), and echocardiography.
- Pre-treatment ECG revealed low heart rates, reduced R-wave amplitudes, and bradycardic arrhythmias (AV block).
- Echocardiography showed reduced contractility and left ventricular wall thickness in most dogs.
Findings:
- Levothyroxine supplementation improved cardiac function in seven dogs.
- Post-treatment ECG demonstrated increased heart rates and R-wave amplitudes, with resolution of bradycardic arrhythmias.
- Echocardiography revealed increased contractility and left ventricular wall thickness after treatment.
Implications:
- This study highlights the cardiac manifestations of hypothyroidism in dogs.
- Levothyroxine therapy effectively reverses cardiac dysfunction associated with canine hypothyroidism.
- Understanding these effects is crucial for diagnosing and managing hypothyroid-related heart conditions in dogs.