Acute development of low T3 syndrome and changes in pituitary-adrenocortical function after elective cholecystectomy in women: some differences between young and elderly patients.
Level 3 - non-randomized controlled study
Prospective non-randomized comparative cohort study
PubMed 1329184 · doi:10.3109/00365519209088788
What was done
Thirty female patients undergoing elective cholecystectomy were evaluated in two age cohorts: 15 young patients (<25 years) and 15 elderly patients (>65 years). Blood samples were collected the day before surgery, on the day of surgery (before premedication and after waking from anesthesia), and on postoperative days 1, 3, and 7. Serum concentrations of TSH, ACTH, T4, T3, reverse T3 (rT3), and cortisol were measured using radioimmunoassay.
What was found
No changes were observed in T4 levels, but T3 significantly decreased and rT3 significantly increased across both groups on day 1 post-surgery. The abstract provides no exact numerical values, standard errors, or effect sizes. Relative differences reported between groups include: - T3 reduction was significantly more pronounced in the young group. - rT3 increased prior to premedication in the young group. - TSH increased sharply at the end of surgery, with a larger increase in the young group. - ACTH peaked sharply during surgery with no difference between groups, but post-operative cortisol levels increased significantly more in the elderly group and remained elevated throughout the recovery period.
Why it matters
This study indicates that endocrine responses to surgical stress differ by age, with younger women displaying sharper acute thyroid axis fluctuations and older women exhibiting more prolonged adrenocortical activation.
Limits
The sample size is very small (15 patients per group) and limited to female cholecystectomy patients. The abstract provides qualitative descriptions without raw numbers, confidence intervals, or exact p-values. Key confounding variables including baseline comorbidities, operative duration, and specific anesthetic regimens are not described.
Cited by
- context T4 can convert into reverse T3 when a person is under high levels of stress.