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Assessing the Site of Recurrence in Patients with Secondary Hyperparathyroidism by a Simplified Casanova Autograftectomy Test

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Abstract

Patients with recurrent secondary hyperparathyroidism (rSHPT) following total parathyroidectomy and autotransplantation were prospectively studied by a modified Casanova test to discriminate between the graft-bearing arm and the neck as the site of the recurrence. The test measures intact parathyroid hormone (PTH) in blood obtained from the non-graft-bearing arm before an ischemic period and from the arm bearing the parathyroid graft during an ischemic period caused by an Esmarch bandage. The aim of this study was to evaluate the time course of PTH levels during the test and to establish an abbreviated procedure. A series of 30 patients with rSHPT who were admitted for reoperative surgery between 1994 and 2002 were studied. Systemic PTH levels were determined prior to suprasystolic exclusion of the graft-bearing arm as well as 2, 4, 6, 8, 10, 20, and 30 minutes during it and at 10 minutes afterward. Results were interpreted with a simple algorithm that suggested graft-dependent recurrence (GDR) whenever PTH levels dropped by more than 50% and neck-dominated recurrence (NDR) whenever the PTH levels dropped to less than 20%. Patients were operated on accordingly. Biochemical normalization of calcium and PTH was defined as success. Altogether, 15 patients had GDR and were cured after graft explantation. All of these patients were identified within 4 minutes of starting the test. Another 12 patients had NDR and were cured by excising overlooked or supernumerary glands. PTH levels were indeterminate in three patients (10%). Clinically, NDR is likely in all of these cases, but the test results were firmly established with 100% accuracy 8 minutes after the start of the test procedure. This abbreviated form of the Casanova test is advantageous for accurately determining the site of recurrence in the presence of rSHPT. It is less time-consuming, satisfactory in an ambulatory setting, equally effective, and less invasive than the original Casanova procedure.

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Correspondence to Katja Schlosser M.D..

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Schlosser, K., Sitter, H., Rothmund, M. et al. Assessing the Site of Recurrence in Patients with Secondary Hyperparathyroidism by a Simplified Casanova Autograftectomy Test. World J. Surg. 28, 583–588 (2004). https://doi.org/10.1007/s00268-004-7321-8

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