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Sheehan syndrome



Endocrine system


Adrenal gland disorders
Thyroid gland disorders
Parathyroid gland disorders
Pancreatic disorders
Pituitary gland disorders
Gonadal dysfunction
Polyglandular syndromes
Endocrine tumors
Endocrine system pathology review

Sheehan syndrome


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High Yield Notes
13 pages

Sheehan syndrome

8 flashcards

USMLE® Step 1 style questions USMLE

3 questions

A 34-year-old woman, gravida 1 para 1, comes to the clinic due to an inability to breastfeed her baby. She had a spontaneous vaginal delivery of a healthy newborn at full-term 3 weeks ago. The labor was complicated by postpartum hemorrhage secondary to retained products of conception, and she required transfusion with 3 units of packed red blood cells. She has been using formula for feeding, as her milk never “came in.” Review of systems is significant for increased fatigue over the same period, which she attributes to lack of sleep. Temperature is 36.5°C (97°7 F), pulse is 102/min, and blood pressure is 92/76 mm Hg. Physical examination reveals cool, dry skin. Which of the following is the most likely cause of this patient’s condition?

External References

Content Reviewers:

Rishi Desai, MD, MPH

Sheehan’s syndrome, is also sometimes called postpartum pituitary gland necrosis, and we can break that down.

Postpartum refers to the time after a mother gives birth to an infant, pituitary gland refers to a tiny gland that is at the base of the brain, and necrosis refers to death.

So, postpartum pituitary gland necrosis is a disorder where cells in a pituitary gland of a new mother start to die - most commonly because excess blood loss during childbirth leaves those cells without adequate blood flow. It is a rare type of pituitary apoplexy.

During pregnancy, a group of cells in the pituitary gland called lactotrophs start to increase in size and number.

These lactotrophs secrete the hormone prolactin, and the increased levels of prolactin prepares the mammary glands to produce milk.

Even though there are more lactotrophs that are larger and more metabolically active, the blood supply to the pituitary gland remains the same.

So there is an increased demand without an increase in supply, means the lactotrophs are hypoperfused.

In other words, the lactotrophs are just barely getting by, and if they get any less blood, than they face ischemic injury and necrosis or death.

What’s even more alarming is that since there are more metabolically active lactotrophs around, they take up a larger proportion of the blood that supplies the pituitary, increasing the risk of ischemia in other cells of the pituitary gland as well.

During the delivery of an infant, excessive blood loss is called postpartum hemorrhage.

Postpartum hemorrhage is generally defined as losing more than 500ml of blood after a vaginal delivery or more than 1000ml after a cesarean section delivery.

When this happens, there’s less blood flowing to the cells in the pituitary gland, and that tips them over - resulting in ischemic necrosis.

If the blood flow isn't restored soon enough, more and more tissue dies, and the pituitary gland progressively shrinks, becomes scarred, and stops producing enough of one or more of the hormones.

In severe cases, severe destruction and scarring can lead to an empty sella turcica which is the spot in the brain where the pituitary gland usually sits.

Increased cell death within the pituitary also means that a number of hormone levels start to fall.


Sheehan syndrome, also known as postpartum hypopituitarism, is a condition that affects women who have experienced postpartum hemorrhage (PPH). PPH causes ischemia to lactotrophs and other cells of the pituitary, causing them. This results in deficiencies of prolactin, growth hormone, thyroid stimulating hormone, adrenocorticotropic hormone, luteinizing hormone, and follicle-stimulating hormone.

During pregnancy, pituitary cells increase in size and number, taking up more blood than usual. So, when there is PPH, these cells are prone to starve and become ischemic. An early symptom of Sheehan syndrome is agalactorrhea, whereas late symptoms include amenorrhea, low blood pressure, low blood sodium, and glucose levels, fatigue, and muscle loss. Sheehan's syndrome can be treated by replacing the deficient hormones, usually for a person's entire life.

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