Endocrinology: Key Clinical Conditions
Clinical features and management of diabetes, thyroid disorders, and adrenal conditions.
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What is the primary metabolic difference between Diabetic Ketoacidosis (DKA) and Hyperosmolar Hyperglycemic State (HHS)?
DKA involves significant ketoacidosis due to absolute insulin deficiency, while HHS involves extreme hyperglycemia and hyperosmolarity without significant ketosis due to relative insulin deficiency.
Why must potassium be monitored and replaced in DKA even if initial serum levels appear normal?
Insulin therapy and the correction of acidosis drive potassium into cells, which can cause a rapid drop in serum potassium and life-threatening arrhythmias.
What is the first-line fluid for initial volume resuscitation in a patient presenting with DKA or HHS?
Isotonic saline (0.9% NaCl) is used initially to restore intravascular volume and improve renal perfusion.
What are the typical laboratory findings for TSH and Free T4 in primary hypothyroidism such as Hashimoto's thyroiditis?
The typical pattern is an elevated TSH level and a decreased Free T4 level.
How is the effectiveness of levothyroxine therapy monitored in patients with primary hypothyroidism?
Effectiveness is monitored by measuring serum TSH levels approximately 6 to 8 weeks after any dose adjustment.
What are the typical laboratory findings for TSH and Free T4 in Graves' disease?
The typical pattern is a suppressed (low) TSH and an elevated Free T4 level.
What are the hallmark clinical features of a thyroid storm?
Hallmark features include severe tachycardia, high fever, agitation or delirium, and gastrointestinal dysfunction such as jaundice or vomiting.
Why is Propylthiouracil (PTU) preferred over Methimazole during the first trimester of pregnancy?
PTU is associated with a lower risk of teratogenic effects, such as aplasia cutis, compared to Methimazole during early organogenesis.
How do ACTH levels differ between primary and secondary adrenal insufficiency?
ACTH is elevated in primary adrenal insufficiency (Addison's) due to lack of feedback, but low or inappropriately normal in secondary adrenal insufficiency.
What result on a Cosyntropin (ACTH) stimulation test confirms primary adrenal insufficiency?
A failure of serum cortisol to rise above a specific threshold (usually 18-20 mcg/dL) after administration of synthetic ACTH.
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