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Saint Louis University School of Medicine, Department of Pediatrics at Cardinal Glennon Children's Hospital, and Saint Louis University Department of Mathematics, Saint Louis, Missouri 63104
Received 29 February 1996; accepted in final form 7 August 1996.
Albers, G. M., R. P. Tomkiewicz, M. K. May, O. E. Ramirez,
and B. K. Rubin. Ring distraction technique for measuring surface
tension of sputum: relationship to sputum clearability. J. Appl. Physiol. 81(6):
2690-2695, 1996.
Poor sputum clearance has been related to sputum
adhesion tension. In this study, we describe a modified du Noüy
ring method for measuring the surface tension (
) of small samples of
sputum and for comparinge the calculated work of adhesion
(Wad) for sputum specimens with
the measured mucociliary transportability (MCTR) and cough
transportability (CTR). The , as measured by this method, correlates
with measured by sputum contact angle on a low-surface-energy solid
(R2 = 0.368, P = 0.03). There is a small
but significant difference in measurements made by these two methods
(P = 0.03).
Wad calculated from the surface
tension ring method is inversely correlated with CTR
(R2 = 0.181, P = 0.004) but has no
correlation with MCTR in this study. The miniaturized ring method gives
accurate and reproducible measurements of the surface tension of small
amounts of respiratory secretions. Because sputum behaves enough like a
liquid that the assumptions made in using the Young equation to
calculate Wad appear valid, we
also showed that the Neumann equation can be used to determine the
surface tension of sputum by its contact angle on tetrafluoroethylene
(Teflon).
physical properties of sputum; adhesion; surface properties; cystic fibrosis; chronic bronchitis
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