Volume 55, Issue 3 pp. 674-681
ORIGINAL ARTICLE

Pulmonary outcome measures in long-term survivors of infantile Pompe disease on enzyme replacement therapy: A case series

Mai K. ElMallah

Mai K. ElMallah

Division of Pulmonary Medicine, Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina

Search for more papers by this author
Ankit K. Desai

Ankit K. Desai

Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina

Search for more papers by this author
Erica B. Nading

Erica B. Nading

Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina

Search for more papers by this author
Stephanie DeArmey

Stephanie DeArmey

Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina

Search for more papers by this author
Richard M. Kravitz

Richard M. Kravitz

Division of Pulmonary Medicine, Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina

Search for more papers by this author
Priya S. Kishnani

Corresponding Author

Priya S. Kishnani

Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, North Carolina

Correspondence Priya S. Kishnani, Division of Medical Genetics, Department of Pediatrics, Duke University School of Medicine, Durham, NC 27710.

Email: [email protected]

Search for more papers by this author
First published: 03 January 2020
Citations: 13

Abstract

Objectives

To report the respiratory function of school-aged children with infantile Pompe disease (IPD) who started enzyme replacement therapy (ERT) in infancy and early childhood.

Study Design

This is a retrospective chart review of pulmonary function tests of: (a) patients with IPD 5 to 18 years of age, (b) who were not ventilator dependent, and (c) were able to perform upright and supine spirometry. Subjects were divided into a younger (5-9 years) and older cohort (10-18 years) for the analysis. Upright and supine forced vital capacity (FVC), maximal inspiratory pressure (MIP), and maximal expiratory pressure (MEP) were analyzed.

Results

Fourteen patients, all cross-reactive immunologic material (CRIM)-positive, met the inclusion criteria and were included in this study. Mean upright and supine FVC were 70.3% and 64.9% predicted, respectively, in the 5- to 9-year-old cohort; and 61.5% and 52.5% predicted, respectively, in the 10- to 18-year-old group. Individual patient trends showed stability in FVC overtime in six of the 14 patients. MIPs and MEPs were consistent with inspiratory and expiratory muscle weakness in the younger and older age group but did not decline with age.

Conclusion

Data from this cohort of CRIM-positive patients with IPD showed that ERT is able to maintain respiratory function in a subgroup of patients whereas others had a steady decline. There was a statistically significant decline in FVC from the upright to a supine position in both the younger and older age groups of CRIM-positive ERT-treated patients. Before ERT, patients with IPD were unable to maintain independent ventilation beyond the first few years of life.

CONFLICTS OF INTEREST

PSK has received grant support from Sanofi Genzyme, Valerion Therapeutics, Shire Pharmaceuticals, and Amicus Therapeutics. PSK has received consulting fees and honoraria from Sanofi Genzyme, Shire Pharmaceuticals, Amicus Therapeutics, Vertex Pharmaceuticals, and Asklepios BioPharmaceutical, Inc (AskBio). PSK is a member of the Pompe and Gaucher Disease Registry Advisory Board for Sanofi Genzyme. PSK has equity in Actus Therapeutics, which is developing gene therapy for Pompe disease.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.