Environmental Exposure to Lead and Its Health Effects on Patients With Maintenance Hemodialysis

Chang Gung Memorial Hospital100 enrolled

Overview

One thousand patients with LHD who have no history of exposure to lead will be observed for 18 months. Blood lead level(BLL), biochemical data, hemoglobin, albumin, Cr, high sensitivity C-reactive protein (HsCRP), and blood cell counts are assessed at baseline. The morbidity and mortality are recorded in detail. Then, one hundred subjects with high BLL (\>20μg/dl) will be randomly assigned to the study and control groups. For 3-6 months, the 50 patients in the study group will receive lead-chelation therapy with calcium disodium EDTA weekly until the BLB falls below BLL\< 5 μg/dl, and the 50 control group patients receive weekly placebo for 12 weeks. During the ensuing 18 months, the BLL, biochemical data will be regularly followed up every 3 months. BLL is measured every 6 months. If BLL of the study group patients increase \>10 μg/dl, the chelation therapy will be performed again until their BLL is \<5 μg/dl. The primary end point is morbidity or mortality during the observation and follow-up period. A secondary end point is the change in hemoglobin, albumin, Cr and Hs CRP during the follow up period.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

SINGLE

Enrollment

100

Conditions

Anemia Malnutrition Inflammation

Interventions

lead chelation therapyDRUG

Patients with lead poisoning (BLL\> 20μg/dl) are randomly assigned to a control or chelation group, on the 1:1 proportion. During the 3 months, 50 chelation group patients receive 2-hour weekly intravenous infusions of one vial (1 g) of calcium di-sodium EDTA mixed with 200 ml of normal saline until BLB is BLL \< 5 μg/dl. Fifty control patients receive weekly 2-hour infusions of one vial (20 ml) of 50% glucose mixed with 200 ml of normal saline over a period of 12 weeks9.

Eligibility

Sex: ALLMin age: 18 YearsMax age: 90 Years

Medical Language ↔ Plain English

Inclusion Criteria: * MHD patients have dialyzed for more than 6 months and age \>18 and \< 90 year-old Exclusion Criteria: * Patients with malignancies and obvious infectious diseases as well as those who are hospitalized or underwent surgery or renal transplantation within the 3 months preceding the investigation;Patients with a history of occupational exposure to heavy metals, metal intoxication, living in metal-contaminated areas were also excluded.

Outcomes

Primary Outcomes

The primary end point is morbidity or mortality during the follow-up period.

Time frame: 18 months follow-up period

Secondary Outcomes

A secondary end point is the change in HB, albumin, Cr and Hs CRP during the follow up period.