Can Alendronate Suppress Calcification and Improve Bone Density in Chronic Peritoneal Dialysis Patients?

National Taiwan University

Status and phase

Completed

Phase 4

Conditions

Osteoporosis

End-Stage Renal Disease

Treatments

Drug: alendronate

Study type

Interventional

Funder types

Other

Identifiers

NCT00261625

940706

Details and patient eligibility

About

Alendronate is a safe and effective drug for treating osteoporosis in post-menopausal women. However, its safety and efficacy in increasing bone mineral density in chronic peritoneal dialysis (PD) patients have not been investigated. Etidronate, another bisphosphonate, can suppress the extent of coronary artery calcification in chronic hemodialysis patients. The hypothesis of this study is that alendronate can increase bone mineral density and suppress aortic and coronary artery calcification in chronic peritoneal dialysis patients.

Full description

Study Design

The study is a prospective, randomized cross-over study. Fifty patients will be included. All participants are randomly allocated to either group 1 or group 2. Each group consists of 25 patients. Group 1 patients receive alendronate 70 mg once weekly in the first 24 weeks of the study, while group 2 patients receive the same dose of drug every week in the second 24 weeks. The extent of coronary artery and aortic calcification is evaluated by using multidetector spiral computed tomography, whereas bone mineral density is measured by dual-energy X-ray absorptiometry. Both examinations are performed at week 0, 24 and 48 for each participant. Serum level of calcium should be kept within normal limits and serum level of phosphorus should be kept below 6 mg/dl.

Administration of Alendronate

One tablet of alendronate (70 mg per tablet) should be swallowed by each patient once every week with water at least 30 minutes before breakfast, beverage or medication of the day during the treatment period. Patients must not lie down for at least 30 minutes after taking the drug.

Measurement of Coronary Artery and Aortic Calcification

Multidetector spiral computerized tomography (CT) of the chest is performed at week 0, 24 and 48 for each participant to measure the extent of coronary and aortic calcification.

Measurement of Bone Density

Dual energy X-ray absorptiometry is performed at week 0, 24 and 48 for each participant to measure the density of bone.

Demographic and Clinical Characteristics of Patients

Patients characteristics such as age and sex are documented. Clinical parameters including body height, body weight, duration of dialysis, calcium concentration of dialysate, and medication under use are recorded. Blood pressure is measured at each clinical visit for 3 times after the patient has sit for at least 15 minutes.

Collection of Laboratory Data

Fasting serum levels of albumin, phosphorus, calcium, alkaline phosphatase (ALP), intact parathyroid hormone (iPTH) and hemoglobin level of each patient are checked at study entry and once every month. Fasting serum levels of triglyceride, total cholesterol, high-density lipoprotein cholesterol (HDL-chol), low-density lipoprotein cholesterol (LDL-chol), and hypersensitive C-reactive protein (CRP) of each patient are checked at study entry and once every 3 months.

Record of Adverse Effects of Alendronate

Any adverse effect of alendronate is recorded every month at clinic visit.

Compliance of Patients

Compliance of the patients is monitored using telephone calls once every week during the treatment period with alendronate.

Enrollment

50 estimated patients

Sex

All

Ages

20 to 80 years old

Volunteers

No Healthy Volunteers

Inclusion criteria

Have received maintenance PD for more than 3 months at National Taiwan University Hospital,
Have high CPP level (≧50), and
Have chest X-ray proven aortic calcification or coronary artery calcification proven before.

Exclusion criteria

Patients are excluded if they have any one of the following conditions: