Canine Hypothyroidism Study Guide
Overview and Clinical Importance
Hypothyroidism is the most common endocrinopathy in dogs, characterized by inadequate production and secretion of thyroid hormones (T4 and T3) by the thyroid gland. This condition affects virtually every organ system due to the fundamental role thyroid hormones play in cellular metabolism, making it a high-yield topic for the NAVLE examination.
The disease typically affects middle-aged dogs (mean age 7 years) and has a strong breed predisposition. Understanding the pathophysiology, clinical presentation, diagnostic approach, and treatment monitoring is essential for successful management of hypothyroid patients.
Anatomy and Physiology
Thyroid Gland Anatomy
The canine thyroid gland consists of two lobes located on either side of the trachea in the cervical region, caudal to the larynx. Unlike humans, dogs do not have an isthmus connecting the two lobes. The gland is composed of follicular cells that synthesize and secrete thyroid hormones and parafollicular C-cells that produce calcitonin.
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