This is a multi-center, prospective, open label, one arm, phase IV study designed to demonstrate paricalcitol efficacy and safety in the treatment of moderate to severe secondary hyperparathyroidism in calcitriol resistant participants on dialysis.~Following screening, participants began an 8-week controlled calcitriol therapy period. Participants whose parathyroid hormone (PTH) levels decreased were to be discontinued from the study. Those whose PTH levels did not decrease began paricalcitol therapy using a dose calculated by 0.04 to 0.1 microgram per kilogram (mcg/kg). Paricalcitol was administered intravenously at anytime during the subjects' dialysis. The paricalcitol dose was to be titrated every 2 weeks until iPTH was reduced or up to 4 months, after which it was to be adjusted monthly for 1 year based on serum PTH, calcium, phosphorus, and albumin measurements.
The primary objective of this study is to evaluate the efficacy and safety of paricalcitol in participants with moderate to severe secondary hyperparathyroidism (SHPT) undergoing hemodialysis who are resistant to treatment with calcitriol.