Which of the following drugs is an alpha1-agonist?
a. clonidine
b. phenylephrine
c. aspirin
d. ibuprofen
b. These drugs are administered topically as nose drops or nasal sprays to produce a decongestant effect. Examples are phenylephrine (Neo-Synephrine) and oxymetazoline (Afrin).
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Calculate the pulmonary shunt fraction for a patient with the following data: Pb = 760 mm Hg; Hb = 10 g/dL; respiratory quotient = 0.8; FIO2 = 0.6; PaO2 = 100 mm Hg; SaO2 = 93%; PaCO2 = 45 mm Hg; = 36 mm Hg; = 70%
a. 13% b. 26% c. 30% d. 41%
Under which circumstance is Medicare the secondary payer?
A. the individual has both Medicare and Medicaid B. the individual is covered by an employer-sponsored health plan C. the individual is covered by TRICARE D. the individual has exhausted benefits of an employer-sponsored health plan