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Vol. 72. Issue 4.
Pages 186-191 (October 2002)
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Vol. 72. Issue 4.
Pages 186-191 (October 2002)
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Modificaciones pre y postoperatorias de las concentraciones plasmáticas de la PTH en la derivación biliopancreática de Larrad
Pre-and postoperative modifications of plasma parathyroid hormone concentrations in biliopancreatic diversion of Larrad
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Álvaro Larrad Jiméneza,1
Corresponding author
LARRAD@inicia.es

Correspondencia: Dr. A. Larrad Jiménez. Rafael Bergamín, 12, ático C, escalera izqda. 28043 Madrid.
, Fernando de la Fuente Simónb, Carlos Sánchez Cabezudoa, Irene Bretónc, Basilio Moreno Esteband
a Unidad de Cirugía Endocrinometabólica. Clínica Ruber. Madrid
b Departamento de Cirugía
c Secciones de Nutrición
d Obesidad. Hospital General Universitario Gregorio Marañón. Madrid
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Resumen
Objetivo

Estudiar las modificaciones de la partormona (PTH) y de la masa ósea tras derivación biliopancreática de Larrad.

Pacientes y métodos

Estudio restrospectivo del metabolismo del calcio, concentraciones de PTH y densitometría ósea en 100 pacientes obesos mórbidos consecutivos, 40 preoperatoriamente y 60 entre 1 y 5 años de la intervención, en los que se ha realizado un análisis de regresión logística de los posibles factores de riesgo.

Resultados

El 41,7% de los operados y el 25% de los no operados (p = 0,087) presentan elevaciones de la PTH. Las modificaciones son más frecuentes en mujeres (p = 0,000) y se normalizan de forma espontánea a partir de los 4 años de la intervención o con la adición de un suplemento oral de 2 g/día de calcio/vitamina D. Aparecen signos de osteopenia en el 17,5% de los operados y en el 13,3% de los no operados (p = 0,184). El único factor predictivo de aumento de PTH es la edad (riesgo relativo [RR]: 2,66). Para la osteopenia los factores predicitivos son la edad mayor de 40 años (RR: 18,53), la calciuria menor de 100 mg/24 h (RR: 4,04) y la fosfaturia mayor de 1.200 mg/24 h (RR: 3,86). La alteración secretora de PTH parece ser dependiente de un bajo aporte de calcio.

Conclusiones

La obesidad mórbida y la derivación biliopancreática originan un desequilibrio secretor de PTH secundario a un bajo aporte de calcio corregible con la adición de 2 g/día de calcio y/o vitamina D, y que produce una escasa repercusión sobre la masa ósea si es controlado.

Palabras clave:
Bypass biliopancreático
Hiperparatiroidismo secundario
Osteoporosis
Objective

To study modifications of parathyroid hormone (PTH) and bone mass after biliopancreatic diversion of Larrad.

Patients and methods

We performed a retrospective study of calcium metabolism, PTH concentrations and bone densitometry in 100 consecutive patients with morbid obesity. Preoperative modifications were studied in 40 patients and those occurring between 1 and 5 years after the operation were studied in 60 patients. Logistic regression analysis was used to evaluate possible risk factors.

Results

Elevated PTH concentrations were found in 41.7% of the postoperative group and in 25% of the preoperative group (p 0.087). Modifications were more frequent in women (p 0.000) and returned to normal spontaneously 4 years after the intervention or with oral supplementation with 2g/day of calcium/vitamin D. Signs of osteopenia were found in 17.5% of the postoperative group and in 13.3% of the preoperative group (p 0.184). The only predictive factor for increased PTH levels was age (RR: 2.66). Predictive factors for osteopenia were age older than 40 years (RR: 18.53), calciuria lower than 100 mg/24h (RR: 4.04) and phosphaturia higher than 1200 mg/24h (RR: 3.86). Alterations in PTH secretion seemed to be due to low calcium intake.

Conclusions

Morbid obesity and biliopancreatic diversion create an imbalance in PTH secretion secondary to low calcium intake, which can be corrected by supplementation with 2 g/day of calcium and/or vitamin D and which has few effects on bone mass if controlled.

Key words:
Biliopancreatic bypass
Secondary hyperparathyroidism
Osteoporosis
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