title: Basal and Post-ACTH Aldosterone and Its Ratios Are Useful During Adrenal Vein Sampling in Primary Aldosteronism.
abstract: Adrenal vein sampling (AVS) is required to identify a lateralized or bilateral aldosterone source in primary aldosteronism.
  
  
  
  Our objectives were to compare basal and post-ACTH selectivity ratio (SR) and lateralization ratio (LR) and to determine the prevalence of basal contralateral suppression and its effect on surgical outcome.
  
  
  
  Bilateral simultaneous adrenal vein samples were obtained before and after a 250-μg bolus of ACTH. Analyses were conducted on 171 technically successful AVS and on the subgroup of 66 operated patients with evaluable outcome data.
  
  
  
  ACTH increased selectivity on both sides from 66.7% in basal samples (SR ≥ 2) to 91.8% poststimulation (SR ≥ 5). A discordance of lateralization between basal (LR ≥ 2) and post-ACTH (LR ≥ 4) values was observed in 28% of cases, which were mostly lateralized cases basally that became bilateral post-ACTH. Basal CL suppression is present in only 30% using absolute ratio of aldosterone between the opposite (nondominant) adrenal vein and the peripheral vein AOPP/AP below 1.5 vs in 77% using aldosterone/cortisol ratio (A/C)OPP/(A/C)P below 1.5. The absence of CL suppression was associated with a lower rate of response to adrenalectomy in terms of clinical and biochemical parameters with difference in clinical cure (55% vs 13% P = .0003) and overall cure (35% vs 9%, P = .0084) using AOPP/AP, but not when using (A/C)OPP/(A/C)P.
  
  
  
  Stimulation with ACTH is useful to improve selectivity of AVS but can frequently modify interpretation of lateralization. Basal ratios are as important as post-ACTH ratios to set an indication of adrenalectomy. AOPP/AP is superior to (A/C)OPP/(A/C)P to assess contralateral suppression. Infrequent CL suppression reveals frequent occurrence of contralateral hyperplasia in lateralized cases and helps predict postoperative outcomes.
authors.affiliation: Department of Medicine (N.E.G., T.L.M., I.B., P.S.Z., A.L.) and Department of Radiology (J.-P.M., E.T.), Division of Endocrinology, Centre de Recherche du Centre hospitalier de l'Université de Montréal (CHUM), Université de Montréal, Québec, H2W 1T8, Canada.
authors.forename: Nada
authors.initials: N
authors.lastname: El Ghorayeb
authors.affiliation: Department of Medicine (N.E.G., T.L.M., I.B., P.S.Z., A.L.) and Department of Radiology (J.-P.M., E.T.), Division of Endocrinology, Centre de Recherche du Centre hospitalier de l'Université de Montréal (CHUM), Université de Montréal, Québec, H2W 1T8, Canada.
authors.forename: Tânia L
authors.initials: TL
authors.lastname: Mazzuco
authors.affiliation: Department of Medicine (N.E.G., T.L.M., I.B., P.S.Z., A.L.) and Department of Radiology (J.-P.M., E.T.), Division of Endocrinology, Centre de Recherche du Centre hospitalier de l'Université de Montréal (CHUM), Université de Montréal, Québec, H2W 1T8, Canada.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Bourdeau
authors.affiliation: Department of Medicine (N.E.G., T.L.M., I.B., P.S.Z., A.L.) and Department of Radiology (J.-P.M., E.T.), Division of Endocrinology, Centre de Recherche du Centre hospitalier de l'Université de Montréal (CHUM), Université de Montréal, Québec, H2W 1T8, Canada.
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Mailhot
authors.affiliation: Department of Medicine (N.E.G., T.L.M., I.B., P.S.Z., A.L.) and Department of Radiology (J.-P.M., E.T.), Division of Endocrinology, Centre de Recherche du Centre hospitalier de l'Université de Montréal (CHUM), Université de Montréal, Québec, H2W 1T8, Canada.
authors.forename: Ping Shi
authors.initials: PS
authors.lastname: Zhu
authors.affiliation: Department of Medicine (N.E.G., T.L.M., I.B., P.S.Z., A.L.) and Department of Radiology (J.-P.M., E.T.), Division of Endocrinology, Centre de Recherche du Centre hospitalier de l'Université de Montréal (CHUM), Université de Montréal, Québec, H2W 1T8, Canada.
authors.forename: Eric
authors.initials: E
authors.lastname: Thérasse
authors.affiliation: Department of Medicine (N.E.G., T.L.M., I.B., P.S.Z., A.L.) and Department of Radiology (J.-P.M., E.T.), Division of Endocrinology, Centre de Recherche du Centre hospitalier de l'Université de Montréal (CHUM), Université de Montréal, Québec, H2W 1T8, Canada.
authors.forename: André
authors.initials: A
authors.lastname: Lacroix
mesh_terms: D000236:Adenoma / Q000097:blood / Q000473:pathology; D000310:Adrenal Gland Neoplasms / Q000097:blood / Q000473:pathology; D000311:Adrenal Glands / Q000098:blood supply; D000324:Adrenocorticotropic Hormone / Q000494:pharmacology; D000328:Adult; D000450:Aldosterone / Q000097:blood*; D001800:Blood Specimen Collection; D005260:Female; D006801:Humans; D006929:Hyperaldosteronism / Q000097:blood* / Q000473:pathology; D008297:Male; D008875:Middle Aged
chemical_list: D000450:Aldosterone; D000324:Adrenocorticotropic Hormone