Standardized procedure for measurement of nasal potential difference: an outcome measure in multicenter cystic fibrosis clinical trials.

Abstract:

:Patients with cystic fibrosis (CF) can be discriminated from healthy subjects by measurement of the nasal potential difference, which has become a useful outcome measure for therapies directed toward correcting defective electrolyte transport in CF. A standard operating procedure was developed by a CF Foundation clinical trials network, to be followed by all sites performing collaborative studies. Key variables in the measurement included type of voltmeter, exploring probe, reference electrodes, and solutions used to assess both sodium transport and chloride conductance. Eight sites submitted data on 3-8 normal and 4-5 CF subjects. Baseline voltage, an index of sodium transport, was -18.2 +/- 8.3 mV (mean +/- SD) for normals, and -45.3 +/- 11.4 mV for CF patients. There was no CFTR-mediated chloride secretion in CF subjects, as evidenced by the lack of response to perfusion with zero chloride + beta agonist solutions (+3.2 +/- 3.5 mV) vs. that in normals (-23.7 +/- 10.2 mV). The standardized nasal potential difference measurement minimizes variability between operators and study sites. Valid and consistent results can be attained with trained operators and attention to technical details. These data demonstrate the procedure to be sufficient for multicenter studies in the CF Foundation network.

journal_name

Pediatr Pulmonol

journal_title

Pediatric pulmonology

authors

Standaert TA,Boitano L,Emerson J,Milgram LJ,Konstan MW,Hunter J,Berclaz PY,Brass L,Zeitlin PL,Hammond K,Davies Z,Foy C,Noone PG,Knowles MR

doi

10.1002/ppul.10448

subject

Has Abstract

pub_date

2004-05-01 00:00:00

pages

385-92

issue

5

eissn

8755-6863

issn

1099-0496

journal_volume

37

pub_type

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