title: Correlations between biochemical testing, pathology findings and preoperative sestamibi scans: a retrospective study of the minimally invasive radioguided parathyroidectomy (MIRP) approach.
abstract: BACKGROUND
  Sestamibi imaging is the most widely used preoperative localization study for patients with hyperparathyroidism. Previous reports examine the relationship between the weight and volume of excised parathyroid glands and preoperative serum calcium and parathyroid hormone (PTH) levels. The aim of this study was to examine whether these variables correlate with the results of preoperative Sestamibi scans.
  
  
  METHODS
  A retrospective review of 150 consecutive patients who underwent preoperative sestamibi imaging for primary hyperparathyroidism between 1998 and 2007 was performed. Variables studied included patient demographics, diagnostic test (sestamibi) results, operative/pathology findings and surgical outcome (normocalcaemia vs. persistent hypercalcaemia). Sestamibi scans were designated as either "negative" (NSS) or "positive" (PSS), where PSS correctly localized abnormal gland(s) enabling a focused neck exploration. The results of sestamibi imaging were correlated with calcium/PTH levels, weight/volume of excised glands and patient outcomes and demographics.
  
  
  RESULTS
  Total excised gland weight/volume and preoperative serum calcium levels were significantly higher with PSS (all, p < 0.04). Higher preoperative serum calcium levels and greater total gland weight/volume were significantly associated with successful operative outcome (presence of postoperative normocalcaemia; all, p < 0.01). Factors associated with operative failure included multi-gland disease (p < 0.01) and NSS (p < < 0.01). Higher diagnostic PTH levels (> 150 pg/mL) were associated with greater excised gland mass (p < 0.05) and volume (p < 0.05). Male gender was associated with higher preoperative serum calcium levels (p < 0.02). Of interest, patients with single-gland disease had significantly higher preoperative PTH levels than patients with multi-gland disease (155 vs. 109 pg/mL, p < 0.05).
  
  
  CONCLUSIONS
  Positive sestamibi scans are associated with heavier/larger parathyroid glands and higher preoperative serum calcium levels. Male gender was associated with higher preoperative serum calcium levels, while single-gland disease was associated with higher preoperative PTH levels. In addition, successful surgical outcome was associated with higher preoperative serum calcium levels and with greater excised parathyroid gland mass/volume. Surgical failure was associated with multi-gland disease and negative sestamibi.
authors.affiliation: Opus 12 Foundation, King of Prussia, PA 19406, USA. stawicki_ace@yahoo.com
authors.forename: Stanislaw Peter
authors.initials: SP
authors.lastname: Stawicki
authors.forename: Maher
authors.initials: M
authors.lastname: El Chaar
authors.forename: Daniel R
authors.initials: DR
authors.lastname: Baillie
authors.forename: Nikhil P
authors.initials: NP
authors.lastname: Jaik
authors.forename: Fernando P
authors.initials: FP
authors.lastname: Estrada
mesh_terms: D019411:Clinical Laboratory Techniques; D005260:Female; D006801:Humans; D006961:Hyperparathyroidism / Q000097:blood / Q000000981:diagnostic imaging* / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000379:methods*; D010280:Parathyroid Glands / Q000000981:diagnostic imaging / Q000601:surgery*; D049268:Positron-Emission Tomography / Q000379:methods*; D011300:Preoperative Care / Q000379:methods; D011379:Prognosis; D019275:Radiopharmaceuticals; D015203:Reproducibility of Results; D012189:Retrospective Studies; D012680:Sensitivity and Specificity; D013223:Statistics as Topic; D025321:Surgery, Computer-Assisted / Q000379:methods*; D017256:Technetium Tc 99m Sestamibi; D016896:Treatment Outcome
chemical_list: D019275:Radiopharmaceuticals; D017256:Technetium Tc 99m Sestamibi