Optimal HCTZ Cessation for Diagnosis of Hyperparathyroidism
Completed · Not applicable
Conditions studied: Hyperparathyroidism
In brief
Primary hyperparathyroidism (PHPT) is the most common cause of hypercalcemia in the ambulatory setting. PHPT may be cured with surgery and indications for intervention have been defined and include urinary calcium/creatinine clearance. Hydrochlorothiazide (HCTZ), the most commonly prescribed medication for hypertension, reduces urinary calcium excretion and confounds urinary testing. As a result, it is universally recommended that thiazide diuretics be stopped in advance of urinary testing. To date, no studies are available to provide evidence-based guidance as to how long HCTZ must be held for urinary calcium excretion to return to steady state in PHPT. The objective of this study is to serially calculate urinary calcium/creatinine clearance ration in patients with suspected PHPT while holding HCTZ to determine the minimum duration of medication cessation necessary for urinary calcium clearance to reach steady state.
Key facts
- Study ID
- NCT02591160
- Run by
- University of Missouri-Columbia
- People needed
- 2
- Starts
- 2015-05-01
- Expected to finish
- 2017-09-13
- Last updated by the study team
- 2018-01-08
Who can join
Age: 18 and older. Sex: any. Healthy volunteers: not accepted.
You may qualify if…
- Elevated calcium on at least two separate draws with coexistent elevated parathyroid hormone (PTH) on at least one occasion.
- Taking Hydrochlorothiazide for hypertension
- Following a "wash period", patients must have a normal range 25-hydroxy Vitamin D level, thyroid stimulation hormone (TSH) and serum magnesium levels.
- Controlled blood pressure
- Willingness to comply with serial sampling
- English as the primary language
- Adults 18 years and older
You may not qualify if…
- Unable to cease Hydrochlorothiazide for any reason
- Congestive heart failure
- Renal insufficiency (GFR <60)
- Cardiovascular event in the last 3 months - include myocardial infarction, new onset atrial fibrillation, and new onset bundle branch block
- Take lithium or other diuretic medication in last 3 months
- Positive family history of familial hypocalciuric hypercalcemia (FHH)
Where it is running
- University of Missouri — Columbia, Missouri, United States
Full record on ClinicalTrials.gov
Trial information comes from ClinicalTrials.gov and is refreshed daily. TrialsForMe does not provide medical care and does not run the studies it lists.