FRI400 A Rare Case Of Acute Sheehan's Syndrome In An Antepartum Patient

Disclosure: E. Jalal: None. C. Baldwin: None. Sheehan’s syndrome (SS) is a known complication of postpartum hemorrhage. It is typically diagnosed several years after birth given slow symptom onset related to hypopituitarism. We report a rare case of life-threatening antepartum pituitary ischemia secondary to hypotension, representing an acute presentation of SS. A 19-year-old primigravid woman at 31 weeks of gestation was admitted to the intensive care unit for septic shock secondary to Klebsiella pneumoniae pyelonephritis. Despite appropriate treatment, persistent hypotension prevented weaning of vasopressor support. Due to concurrent mild hyponatremia, the following studies were obtained: morning cortisol (2.46 mcg/dL [4.5-23 mcg/dL]), thyroid stimulating hormone (TSH) (0.379 IU/L [0.47-4.7 IU/L]), free triiodothyronine (2.1 pg/mL [2.8-5.3 pg/mL]), and free thyroxine (0.77 ng/dL [0.7-1.8 ng/dL]). Endocrinology was consulted for evaluation of adrenal insufficiency and abnormal thyroid function tests. Her prolactin was measured at 10.3 ng/mL, far below the expected range in a 3(rd) trimester pregnancy (35-600 ng/mL). Her remaining anterior pituitary hormone panel was unremarkable. MRI brain without contrast showed no evidence of an acute stroke or hemorrhage and commented that the prominence of the pituitary gland was likely related to current pregnancy. Stress dose hydrocortisone 100mg thrice daily and levothyroxine 50 mcg daily were initiated, allowing for weaning of vasopressor support. By discharge, she was titrated to levothyroxine 75mcg daily and hydrocortisone 20mg in the morning and 5mg in the afternoon. Repeat outpatient pituitary function testing found increase of prolactin to 397 ng/mL (35-600 ng/mL) and of IGF-1 to 486 ng/mL (113-408 ng/mL) as well as normalization of TSH to 3.210 (0.45-4.5IU/L), indicating likely recovery of pituitary axis. When readmitted at 38 weeks gestation for scheduled induction, she was given stress dose hydrocortisone 100mcg for labor. On discharge, she was tapered to prednisone 10mg daily and levothyroxine 50mcg daily. Appropriate hormone replacement and stress dose hydrocortisone resulted in an uncomplicated delivery and signs of clinical pituitary recovery postpartum as she was able to breastfeed without need for supplementation and maintain normotension after self-discontinuing prednisone and levothyroxine. The leading diagnosis to explain this patient’s hypopituitarism is acute SS, which is defined as symptom onset within 6 weeks postpartum. In our case, septic shock caused an abrupt onset of persistent hypotension leading to hormone levels suggestive of panhypopituitarism while the patient was pregnant at 31 weeks of gestation, which has not been reported in prior literature. While known as a chronic diagnosis in the postpartum population, further research should explore possible stunning effect of acute hypotension manifesting as acute SS in peripartum patients. Presentation: Friday, June 16, 2023