Transient hypogonadotropic hypogonadism caused by critical illness

Area of Science:

• Endocrinology
• Reproductive Medicine
• Critical Care Medicine

Background:

• Acute severe illness can significantly impact endocrine function.
• Pituitary-gonadal axis function is crucial for reproductive health and overall homeostasis.

Purpose of the Study:

• To investigate the effects of acute severe illness on pituitary-gonadal function in men and women.
• To determine if critical illness uniformly leads to hypogonadotropic hypogonadism.

Main Methods:

• Assessed serial plasma levels of testosterone, ultrafiltrable testosterone, estradiol, sex hormone-binding globulin, LH, and FSH.
• Studied patients with traumatic brain injury, myocardial infarction, elective surgery, and intracranial vascular accidents.
• Measured gonadotropin responses to GnRH in a subset of patients.

Main Results:

• Men experienced significant decreases in testosterone levels within 24 hours of illness onset, with further declines observed.
• Women, both premenopausal and postmenopausal, showed significant reductions in LH, FSH, and estradiol levels.
• Gonadotropin levels decreased after testosterone decline in men, and GnRH response remained intact, suggesting a suprapituitary origin.

Conclusions:

• Critically ill men and women uniformly develop temporary hypogonadotropic gonadal insufficiency.
• This condition manifests as low testosterone in men and decreased estradiol in women.
• The pathophysiology appears to be suprapituitary, independent of illness type or gonadal function.