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Vol. 70. Issue 10.
Pages 640-648 (December 2023)
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Vol. 70. Issue 10.
Pages 640-648 (December 2023)
Original article
Normocalcemic hyperparathyroidism after successful parathyroidectomy for single parathyroid adenoma: Prevalence, etiological factors, predictive markers, treatment and evolution
Hiperparatiroidismo normocalcémico tras paratiroidectomía exitosa por adenoma único paratiroideo: prevalencia, factores etiológicos, marcadores predictivos, tratamiento y evolución
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Luis García Pascuala,
Corresponding author
23566LGP@comb.cat

Corresponding author.
, Andreu Simó-Servata, Carlos Puig-Jovéa, Lluís García-Gonzálezb
a Servei d’Endocrinologia, Hospital Universitari Mútua de Terrasa, Terrassa, Spain
b Servei de Cirurgia General i Aparell Digestiu, Hospital Universitari Arnau de Vilanova, Lleida, Spain
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Tables (3)
Table 1. Prevalence, possible causes, treatment received and outcome of patients with PPNCHPPT compared to patients without PPNCHPPT after parathyroidectomy.
Table 2. Possible predictive factors of PPNCHPPT.
Table 3. Variables with predictive power to distinguish between patients with and without PPNCHPPT.
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Abstract
Background and objective

Postparathyroidectomy normocalcemic hyperparathyroidism (PPNCHPPT) is a frequent situation for which we have no information in our country. The objective is to know our prevalence of PPNCHPPT, the associated etiological factors, the predictive markers, the treatment administered and the evolution.

Patients and method

Retrospective observational cross-sectional study on 42 patients. Twelve patients with PPNCHPPT and 30 without PPNCHPPT are compared.

Results

HPPTNCPP prevalence: 28.6%. Etiological factors: vitamin D deficiency: 75%; bone remineralization: 16.7%; renal failure: 16.7%; hypercalciruria: 8.3%. No change in the set point of calcium-mediated parathormone (PTH) secretion was observed, but an increase in the preoperative PTH/albumin-corrected calcium (ACC) ratio was observed. Predictive markers: PTH/ACC ratio (AUC 0.947; sensitivity 100%, specificity 78.9%) and PTH (AUC 0.914; sensitivity 100%, specificity 73.7%) one week postparathyroidectomy. Evolution: follow-up 30 ± 16.3 months: 50% normalized PTH and 8.3% had recurrence of hyperparathyroidism. Patients with PPNCHPPT less frequently received preoperative treatment with bisphosphonates and postoperative treatment with calcium salts.

Conclusions

This is the first study in our country that demonstrates a mean prevalence of PPNCHPPT, mainly related to a vitamin D deficiency and a probable resistance to the action of PTH, which can be predicted by the PTH/ACC ratio and PTH a week post-intervention and often evolves normalizing the PTH. We disagree with the etiological effect of hypercalciuria and the change in the PTH/calcemia regulation set point, and we acknowledge the scant treatment administered with calcium salts in the postoperative period.

Keywords:
Postoperative hyperparathyroidism
Primary hyperparathyroidism
Parathyroidectomy
Resumen
Antecedentes y objetivo

El hiperparatiroidismo normocalcémico postparatiroidectomía (HPPTNCPP) es una situación frecuente de la que no tenemos información de nuestro país. El objetivo es conocer nuestra prevalencia del HPPTNCPP, los factores etiológicos asociados, los marcadores predictivos, el tratamiento administrado y la evolución.

Pacientes y método

Estudio retrospectivo observacional transversal sobre 42 pacientes. Se comparan 12 pacientes con HPPTNCPP y 30 sin HPPTNCPP.

Resultados

Prevalencia del HPPTNCPP: 28,6%. Factores etiológicos: déficit de vitamina D: 75%; remineralización ósea: 16,7%; insuficiencia renal: 16,7%; hipercalciuria: 8,3%. No se observó cambio en el punto de regulación de la secreción de parathormona (PTH) mediada por la calcemia, pero sí un aumento del cociente PTH/calcio corregido por albúmina (CCA) preoperatorio. Marcadores predictivos: cociente PTH/CCA (AUC 0,947; sensibilidad 100%, especificidad 78,9%) y PTH (AUC 0,914; sensibilidad 100%, especificidad 73,7%) una semana postparatiroidectomía. Evolución: seguimiento 30 ± 16,3 meses: 50% normalizó PTH y 8,3% tuvo recurrencia del hiperparatiroidismo. Los pacientes con HPPTNCPP recibieron con menor frecuencia tratamiento preoperatorio con bifosfonatos y posoperatorio con sales de calcio.

Conclusiones

Es el primer estudio en nuestro país que demuestra una prevalencia media del HPPTNCPP, relacionado principalmente con un déficit de vitamina D y con una probable resistencia a la acción de la PTH, que puede ser predicho mediante el cociente PTH/CCA y la PTH a la semana postintervención, que con frecuencia evoluciona normalizando la PTH. Disentimos del efecto etiológico de la hipercalciuria y del cambio en el punto de regulación PTH/calcemia, y reconocemos el escaso tratamiento administrado con sales de calcio en el posoperatorio.

Palabras clave:
Hiperparatiroidismo postoperatorio
Hiperparatiroidismo primario
Paratiroidectomía

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