Clinical Study of Aldurazyme in Patients With Mucopolysaccharidosis (MPS) I

Inclusion Criteria: * The patient had a documented diagnosis of MPS I confirmed by measurable clinical signs and symptoms of MPS I and a fibroblast or leukocyte alpha-L-iduronidase enzyme activity level of less than 10% of the lower limit of the normal range of the measuring laboratory. * Female patients of childbearing potential had a negative pregnancy test (urine-beta-human chorionic gonadotropin (hCG)) at baseline (all female patients of childbearing potential and sexually mature male patients were advised to use a medically accepted method of contraception throughout the study). * The patient was capable of standing independently for 6 minutes and walking a minimum of 5 meters within 6 minutes. * The patient was capable of performing a reproducible FVC maneuver. * The patient had a baseline FVC value that was less than or equal to 80% of the patient's predicted normal FVC value based on polgar predicted values for standing height for children 5 through 7 years of age and the Hankinson predicted values for ages 8 and above. Exclusion Criteria: * The patient had undergone a tracheostomy. * The patient had previously undergone a bone marrow transplantation. * The patient was pregnant or lactating. * The patient has received an investigational drug within 30 days prior to study enrollment. * The patient had a medical condition, serious intercurrent illness, or other extenuating circumstance that could have significantly interfered with study compliance including all prescribing evaluations and follow-up activities. * The patient had a known hypersensitivity to rhIDU or to components of the active or placebo test solutions.