OR13-03 Assessment Of Skeletal Health Including Bone Density, Turnover, Microarchitecture And Osteoporosis In Patients With Sheehan’s Syndrome: A Prospective, Multicentric Study In Asian Indians

Disclosure: L. Das: None. B. Laway: None. J. Sahoo: None. S.K. Bhadada: None. P. Dutta: None. Introduction: Sheehan’s syndrome (SS) is a rare cause of hypopituitarism. Evidence on skeletal health in patients with this condition is limited, and data on bone geometry, structure and volumetric bone mineral density (BMD) are lacking. We aimed to comprehensively explore skeletal fragility in a multicentric cohort of treated SS. Patients and Methods: Patients with SS were recruited for analysis of demographic, clinico-biochemical and hormonal profile including bone turnover markers. Areal BMD, T- and Z-scores and trabecular bone score (TBS) were evaluated using DXA. In a subset of patients (n=29) as well as age-and BMI-matched controls (n=34), high-resolution peripheral quantitative computed tomography (HRpQCT, XtremeCT II, Scanco Medical AG, Switzerland) was performed to assess bone geometry and microarchitecture. Results: There were a total of 105 patients with SS with a mean age 45.2 ± 10.5 years and a lag of 7.4 ± 5.5 years from disease onset to diagnosis. Regular levothyroxine replacement was ongoing in 91.2% and glucocorticoid replacement in 86.1% of the cohort. Past HRT replacement was done in 66.7% patients. Bone turnover markers (P1NP, CTX) were not significantly different between cases and controls. The T- score [-2.3 (-3.0 to -1.6) vs -1.5 (-3.0 to -0.7)] and Z-score [-1.4 (-2.1 to -1.2) vs -0.6 (-2.1 to -0.1)] at the lumbar spine (LS) and the T- score [-1.8 (-2.3 to -1.3) vs -0.8 (-2.1 to -0.1)] and Z-score [-1.1 (-1.7 to -0.4) vs -0.4 (-1.0 to 0.2)] at the femoral neck (FN) were lower in cases as compared to controls (trend towards significance). Osteopenia or osteoporosis was prevalent in significantly greater proportion of the cases as compared to controls, at LS (96.3% vs 64.7%), FN (91.7% vs 47%) and ultradistal radius (65.2% vs 11.8%). Bone microarchitectural assessment showed no significant differences between TBS, or bone geometry. However, trabecular volumetric bone mineral density was higher at both tibia (p<0.05) and radius (p>0.05) in cases as opposed to age-and BMI-matched controls. There was a weak negative correlation between glucocorticoid and levothyroxine replacement duration and BMD at both LS and FN (p<0.05), but not with replacement dose. Conclusion: Osteopenia-osteoporosis is highly prevalent in SS. BMD at both LS and FN is negatively correlated with duration of glucocorticoid and levothyroxine exposure. There are no significant differences in bone microarchitecture or geometry but tibial trabecular volumetric BMD is greater in treated SS. Presentation: Friday, June 16, 2023