Endocrine Flashcards
What HbA1C level is diagnostic of diabetes mellitus?
48mmol/L or more
What is the immediate treatment for thyrotoxic storm?
Beta-blockers, PTU and Hydrocortisone
What is the investigation of choice for suspected Cushing’s?
Overnight dex suppression test
Where are sex hormones produced?
Zona reticularis of adrenal gland
Where is cortisol produced?
Zona fasciculata of adrenal gland
Where is aldosterone produced?
Zona glomerulosa of adrenal gland
Which adrenal condition may lead to Cushing’s syndrome?
Adrenocortical tumour
What is Addison’s disease?
Primary adrenocortical failure
Give causes of Addison’s disease.
90% due to autoimmune destruction
Others: Infection, adrenal haemorrhage/infarct, metastatic invasion
What are the features of Addison’s disease?
Cortisol deficiency: Fatigue, weight loss, orthostatic dizziness and anorexia
ACTH over-secretion: Skin hyperpigmentation
Give causes of Addisonian Crisis.
Can occur in increased cortisol req. Eg. infection, surgery
Adrenal haemorrhage
Inadequate cortisol dosing
Which biochemical abnormalities may be found in Addisonian Crisis?
hyponatraemia, hyperkalaemia, raised urea
What is the maintenance therapy for Addison’s disease?
Hydrocortisone & Fludrocortisone
What is Conn Syndrome?
Primary Hyperaldosteronism - excess aldosterone production
What is the most common cause of Conn’s syndrome?
unilateral adrenocortical adenoma
What is the key feature of Conn Syndrome?
Resistant hypertension +/- hypokalaemia
What is the investigation of choice in Conn Syndrome?
paired renin and aldosterone serum levels
What is the treatment for pheochromocytoma?
alpha blocker then beta-blocker, then surgery
What is the most common form of Congenital Adrenal Hyperplasia?
21-hydroxylase deficiency
How may CAH present?
failure to thrive or ambiguous genitalia in females
How can serum osmolality be estimated?
2 * Na+ + glucose + urea