Angiotensin-Converting Enzyme Inhibition and Parathyroid Hormone Secretion

Abstract EN

Background.

Prior studies suggest that renin-angiotensin-aldosterone system (RAAS) inhibitors decrease parathyroid hormone (PTH) secretion.

Objective.

To evaluate the effect of angiotensin-converting enzyme inhibitors (ACEi) on serum PTH in participants with and without primary hyperparathyroidism (P-HPT).

Methods.

An open-label, single-arm, pilot study whereby participants with and without P-HPT had PTH were evaluated before and after 1 week of maximally tolerated lisinopril therapy.

Results.

A total of 12 participants with, and 15 participants without, P-HPT successfully completed the protocol.

Following 1 week of lisinopril, participants with P-HPT had a decrease in systolic blood pressure (SBP) (−6.4 mmHg, P<0.01), an increase in plasma renin activity (PRA) (+1.50 ng/mL/h, P=0.06), and a decrease in PTH (79.5 (21.6) to 70.9 (19.6) pg/mL, ∆=−8.6 pg/mL, P=0.049); however, serum and urine calcium did not change.

In contrast, although 1 week of lisinopril significantly decreased SBP and increased PRA among participants without P-HPT, there were no changes in PTH or calcium.

Conclusion.

In this short pilot investigation, 1 week of maximally titrated ACEi did not impact PTH in participants without P-HPT, but resulted in a modest and marginally significant reduction of PTH but not calcium, among participants with P-HPT.

This trial is registered with ClinicalTrials.gov NCT01691781.