The public health nurse is teaching a class on summer and sun precautions. Which statement by a member of the class about the use of sunscreens best demonstrates understanding?
a. "Sunscreens containing PABA should be avoided in those with allergy to hydrochlorothiazide."
b. "Sunscreens cannot protect against photoaging of the skin."
c. "Sunscreens cannot protect against photosensitivity reactions during use of sulfonamides."
d. "An SPF of 40 is twice as potent as an SPF of 15."
ANS: A
Sunscreens that contain para-aminobenzoic acid (PABA) should not be used by people with allergies to benzocaine, sulfonamides, and thiazides, all of which can cross-react with PABA. Hydrochlorothiazide is a thiazide diuretic. This statement demonstrates understanding.
Sunscreens do protect against photoaging of the skin; further teaching is needed.
Sunscreens protect against photosensitivity reactions associated with sulfonamides; further teaching is needed.
An SPF of 40 (97.5% block) is not twice as potent as an SPF of 15 (93% block); further teaching is needed.
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