Resistance to Vitamin D or Parathyroid Hormone

2014-08-27 03:59:41 | BioPortfolio


Patients with confirmed or suspected conditions with a resistance to vitamin D or parathyroid hormone (PTH) will be admitted for diagnosis and treatment, and inclusion in other studies pertaining to similar conditions.

This study will provide information about problems relating to calcium in the blood, urine, and bones. Patients in this study will undergo a general evaluation / check-up to give researchers an idea of each person's condition or disease. Patients will receive treatment based on their diagnosis and asked to provide specimen samples for further research studies.


Patients with confirmed or suspected states with resistance to vitamin D or parathyroid hormone (PTH) will be admitted for diagnosis and treatment and for inclusion in other protocols. These states include hypocalcemia, rickets, osteomalacia, pseudohypoparathyroidism. Resistance to a factor is manifested by deficient bioeffect despite high levels of the factor in blood. Patients will be tested with multiple indices of mineral metabolism to establish the diagnosis and examine the spectrum of the underlying disorder. The principal therapies will be combinations of calcium, phosphate, and a vitamin D analog. Selected patients will have localization and surgery to remove a tumor that causes renal wasting of phosphate. Patients will be considered for entry into other research protocols.

Study Design





National Institutes of Health Clinical Center, 9000 Rockville Pike
United States




National Institutes of Health Clinical Center (CC)

Results (where available)

View Results


Published on BioPortfolio: 2014-08-27T03:59:41-0400

Clinical Trials [17 Associated Clinical Trials listed on BioPortfolio]

Vitamin D Levels and Postoperative Hypocalcemia After Total Thyroidectomy

Hypocalcemia is one of the most frequent complications of total thyroidectomy, a procedure used for benign as well as malignant conditions of the thyroid gland. Postoperative hypocalcemia ...

Early Prediction of Hypocalcemia After Thyroidectomy Using Postoperative Second Hour Parathormone

Hypocalcemia is the most frequent complication in thyroid surgeries. Diagnosing this complication earlier will reduce longer hospital stay and will lead to an earlier intervention. The pur...

Prevention of Hypocalcemia in Patients Undergoing Total Thyroidectomy Plus Central Neck Dissection

the increased risk of hypocalcemia following total thyroidectomy plus central neck dissection can be minimized by routine administration of oral calcium and vitamin D supplements during th...

Hypocalcemia in Infants and Children

Hypocalcemia is defined as reduction in the level of the ionized calcium in the blood to less than 0.95 mmole/ litre. In some cases it is associated with symptoms such as neuromuscular im...

Routine Calcium for Preventing Hypocalcemia

The present study investigated the effect of routine calcium and vitamin D supplementation and tried to find the predictors for postoperative hypocalcemia in patients with thyroid cancer.

PubMed Articles [36 Associated PubMed Articles listed on BioPortfolio]

Factors predicting hypocalcemia after total thyroidectomy - A retrospective cohort analysis.

Hypocalcemia after total thyroidectomy is the most frequent complication resulting in prolongation of hospitalisation. Therefore we aimed to analyse clinical risk factors predictive for hypocalcemia a...

Facing cinacalcet-induced hypocalcemia: sit back and relax?

A post hoc analysis of data from the EVOLVE study demonstrates that cinacalcet-induced hypocalcemia is common, mostly asymptomatic, and resolves spontaneously. These findings are reassuring and may wa...

Presumptive Glucocorticoid-Induced Refractory Hypocalcemia in a Dog with Idiopathic Immune-Mediated Hypoparathyroidism, Thrombocytopenia, and Hemolytic Anemia.

Clinically relevant hypocalcemia is a well-documented complication of glucocorticoid administration in people with hypoparathyroidism. The current report describes the phenomenon in a dog. A 7 yr old ...

The impact of hypocalcemia on full scale IQ in patients with 22q11.2 deletion syndrome.

Hypocalcemia has been reported in ~50% of patients 22q11.2DS and calcium regulation is known to play a role in neuronal development and synaptic plasticity. Because calcium ions play a role in neurona...

Prevalence of subclinical hypocalcemia in dairy cows in the Sousa city micro-region, Paraíba state.

Subclinical hypocalcemia is a metabolic disorder characterised by a decrease in serum calcium (Ca) levels, with no clinical symptoms. The aim of this study was to determine the punctual prevalence of ...

Medical and Biotech [MESH] Definitions

A condition caused by a deficiency of PARATHYROID HORMONE (or PTH). It is characterized by HYPOCALCEMIA and hyperphosphatemia. Hypocalcemia leads to TETANY. The acquired form is due to removal or injuries to the PARATHYROID GLANDS. The congenital form is due to mutations of genes, such as TBX1; (see DIGEORGE SYNDROME); CASR encoding CALCIUM-SENSING RECEPTOR; or PTH encoding parathyroid hormone.

Reduction of the blood calcium below normal. Manifestations include hyperactive deep tendon reflexes, Chvostek's sign, muscle and abdominal cramps, and carpopedal spasm. (Dorland, 27th ed)

A syndrome resulting from cytotoxic therapy, occurring generally in aggressive, rapidly proliferating lymphoproliferative disorders. It is characterized by combinations of hyperuricemia, lactic acidosis, hyperkalemia, hyperphosphatemia and hypocalcemia.

Abnormally elevated PARATHYROID HORMONE secretion as a response to HYPOCALCEMIA. It is caused by chronic KIDNEY FAILURE or other abnormalities in the controls of bone and mineral metabolism, leading to various BONE DISEASES, such as RENAL OSTEODYSTROPHY.

A hereditary condition clinically resembling HYPOPARATHYROIDISM, but caused by failure of response to rather than deficiency of parathyroid hormones. It is characterized by hypocalcemia and hyperphosphatemia, and is commonly associated with short stature, obesity, short metacarpals, and ectopic calcification. (Dorland, 27th ed)

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