Pituitary function before and after surgery for nonfunctioning pituitary adenomas-data from the Swedish Pituitary...

Area of Science:

• Endocrinology
• Neurosurgery
• Oncology

Background:

• Nonfunctioning pituitary adenomas (NFPA) represent a significant proportion of pituitary tumors.
• Pituitary function following surgical intervention for NFPA remains a complex area with inconsistent data.
• The hypothalamic-pituitary-adrenal (HPA) axis is particularly vulnerable to surgical disruption.

Purpose of the Study:

• To investigate changes in anterior pituitary function after transsphenoidal surgery for NFPA.
• To specifically assess the impact of surgery on the HPA axis up to five years postoperatively.
• To provide data guiding long-term patient management strategies.

Main Methods:

• Analysis of data from the Swedish Pituitary Register (1991-2014).
• Inclusion of 838 patients with NFPA, excluding those with prior reoperation or radiotherapy.
• Longitudinal assessment of pituitary axes (ACTH, TSH, LH/FSH, GH) preoperatively and up to five years postoperatively.

Main Results:

• Preoperative deficiencies were common: ACTH (31%), TSH (39%), LH/FSH (51%), GH (28%).
• One year postoperatively, ACTH deficiency increased significantly to 38% (P < .001), with 23% developing new deficiency and 26% recovering.
• Similar patterns of new deficiencies and recoveries were observed in TSH and LH/FSH axes, with no significant change between years 1 and 5.

Conclusions:

• Adrenocorticotrophic hormone deficiency significantly increases one year after NFPA surgery.
• While not statistically significant, shifts in pituitary function (recovery or new deficiency) occur between one and five years postoperatively.
• Emphasizes the need for continuous, individualized pituitary function monitoring in patients following NFPA surgery.