Active clinical trials for "Hyperparathyroidism, Primary"

This study will look at the effect of 2 treatment regimens that contain vitamin D in a six-month treatment trial of patients with PHPT who are vitamin D deficient. Patients will be assigned randomly to one of 2 regimens, and will be followed with tests of their blood, urine and bones. This study should provide important information on the effect of vitamin D therapy in patients with PHPT. In addition, data from this study will guide physicians as to how best to treat their patients who have PHPT and vitamin D deficiency.

The aim of this study is to establish whether patients with mild primary hyperparathyroidism (PHPT) have an increased risk of cardiovascular diseases. The primary outcome is to determine whether arterial stiffness and blood pressure will decrease in patients with mild PHPT 3-month after parathyroidectomy (PTX).

The primary objectives were to assess the safety and tolerability of twice daily (BID) doses of 65 mg cinacalcet administered orally to adults with primary HPT.

This study will evaluate the benefits and side effects of a new medication called Cinacalcet for treating patients with primary hyperparathyroidism associated with multiple endocrine neoplasia type 1 (MEN1) or type 2A (MEN2A). Patients with primary hyperparathyroidism have elevated levels of blood calcium caused by too much parathyroid hormone released by one or more parathyroid tumors. The parathyroids are small glands located in the neck. Most cases of primary hyperparathyroidism are due to a single overactive parathyroid gland, but in MEN1 and MEN2A, several glands are overgrown and overactive. Cinacalcet decreases the secretion of parathyroid hormone. Patients 18 years of age and older with primary hyperparathyroidism and MEN1 or MEN2A and who are not candidates for parathyroid surgery may be eligible for this study. Participants are admitted to the Clinical Center for 1 week blood and urine tests and imaging studies, and initiation of Cinacalcet treatment. They take the drug by mouth and have daily blood tests until the dosage required to achieve normal blood calcium levels is determined. Patients return to the hospital 2 weeks later for 1 week to evaluate the response to the drug and make any necessary adjustments. Treatment may continue for as long as 1 year with 1-week admissions every 3 months to monitor the benefits and side effects of Cinacalcet. Evaluations may include the following: Blood and urine analyses. Measurement of gastric acid secretion. For this test, a soft plastic tube is inserted into the nose or mouth and then swallowed and then gently removed about an hour later. Injections of secretin, calcium and arginine into a vein and collection of blood samples to measure the responding increase in levels of gastrin, calcitonin and insulin, respectively. These tests are used to diagnose and monitor hormone secretion from endocrine tumors and are used in this study to assess the response to Cinacalcet treatment. Radioisotope test to evaluate tumors of the endocrine organs. A radioactive substance injected into a vein is taken up by the endocrine tissue and the concentrated radioactivity is measured. Imaging tests, such as MRI and CT, to detect or follow growing tumors in the pituitary, neck, and abdomen. CT is a special type of x-ray machine that visualizes tissues, such as thyroid or parathyroid tumors. MRI uses a magnetic field and radio waves to obtain pictures of different tissues in the head, neck and abdomen. DEXA scan to assess bone density. This test uses standard low-intensity x-rays.

The primary aim of the study is to assess whether 6-months of vitamin D supplements can decrease PTH compared with placebo treatment in primary hyperparathyroidism.

The primary objective was to assess the safety and tolerability of cinacalcet in adults with primary hyperparathyroidism (HPT) when administered as a single oral once daily doses for 6 consecutive weeks and twice daily for 15 consecutive days.

This study will evaluate whether blocking the mineralocorticoid receptor, alone, or in combination with the calcimimetic cinacalcet, can lower parathyroid hormone and calcium levels in primary hyperparathyroidism.

To evaluate the efficacy of KHK7580 orally administered up to 24 weeks for hypercalcemia in patient with parathyroid carcinoma or primary hyperparathyroidism who are unable to undergo parathyroidectomy or relapse after parathyroidectomy.

The purpose of the study is to determine the effect of forearm exercise on forearm bone density in post-menopausal women with or without primary hyperparathyroidism. The investigators hypothesize that forearm exercise will increase forearm bone density in patients with primary hyperparathyroidism more so than in patients without primary hyperparathyroidism.

Reliable identification of parathyroid glands is critical to the success of thyroid and parathyroid surgery. In thyroid surgery, inadvertent injury to parathyroid glands may cause temporary or permanent hypoparathyroidism (low calcium levels needing long term treatment). In parathyroid surgery, early identification of normal and/or enlarged parathyroid glands helps in deciding on the extent of surgery and increases the chances of postoperative normal calcium levels. Methylene Blue (Methylthioninium chloride, MB) is a dye that when given intravenously in high doses, is taken up differently by thyroid and parathyroid tissue. It is currently used during parathyroid surgery by some surgeons to help identify enlarged parathyroid glands by visual examination alone. Such visual examination is unhelpful in the identification of 'normal' parathyroid tissue. MB exhibits fluorescent properties in the near-infrared range (light just beyond the visible spectrum). This can be picked up by an appropriate imaging system. This has potential to identify and differentiate between 'normal' parathyroid, 'abnormal' parathyroid and thyroid tissue during surgery. The investigators have established the feasibility of the intra-operative use of a near infra-red fluorescent imaging device called Fluobeam® and demonstrated the ability of this device to pick up near infra-red fluorescence from human tissue after administration of intravenous MB. Animal experiments have shown that doses as low as 0.1mg/kg of MB given intravenously enable fluorescent visualisation of thyroid and parathyroid glands. This study will aim to optimise the dose and timing of administration of MB in human thyroid and parathyroid surgery and to develop a protocol which would then subsequently be assessed for effectiveness in a multi-centred randomized controlled setting.