Which of the following are true of postural drainage?
1. It is most effective in disorders causing excessive sputum.
2. It is most effective in head-down positions greater than 25 degrees.
3. It requires adequate systemic hydration to be effective.
4. It improves mucociliary clearance in normal subjects.
a. 2 and 4 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 1, 2, and 4 only
ANS: B
Postural drainage is most effective in conditions characterized by excessive sputum production (>25 to 30 ml/day). For maximum effect, head-down positions should exceed 25 degrees below horizontal. Postural drainage is not likely to succeed unless and until adequate systemic and air-way hydration is ensured.
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