Harvesting airway surface liquid: a comparison of two techniques.

Abstract:

:The quantity and composition of airway surface liquid (ASL) are essential to host defense. To date, attempts to harvest ASL and measure its composition have yielded conflicting results. We investigated the physical principles underlying two techniques that were proposed for harvesting ASL: filter paper pledgets and polyethylene catheters. We compared the force and pressure generation and the kinematics of capillarity-induced fluid uptake with both techniques. Both have significant limitations for harvesting ASL, generating physiologically significant pressures (filter paper, 60.4 Pa; polyethylene, 14.3 Pa) that could potentially compromise epithelial integrity. Furthermore, filter paper generates a force 85-fold higher than the polyethylene catheter, which is associated with a very high rate of uptake of liquid and a large total amount of liquid relative to ASL thickness. While the PE catheter harvests liquid more gently, it is only effective when ASL surface tension is below 31 mN/m. These limitations likely account for some of the variability in reported ASL composition, and highlight the need for improved methods for harvesting ASL.

journal_name

Pediatr Pulmonol

journal_title

Pediatric pulmonology

authors

Landry JS,Landry C,Cowley EA,Govindaraju K,Eidelman DH

doi

10.1002/ppul.10409

subject

Has Abstract

pub_date

2004-02-01 00:00:00

pages

149-57

issue

2

eissn

8755-6863

issn

1099-0496

journal_volume

37

pub_type

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