How many pulmonary veins are there?

A 65-year-old male is intubated and placed on a mechanical ventilator after a motor vehicle ac-cident

Thirty-six hours later he develops infiltrates on the chest radiograph. Which of the following ac-tions may have been able to prevent this from occurring? 1. Elevation of the head of the bed 20 to 30 degrees 2. Aspiration of subglottic secretions 3. Changing ventilator circuit every 24 hours 4. Stress ulcer prophylaxis 5. Avoid the use of sedatives a. 1 only c. 1, 2, 4, and 5 b. 1, 3, and 5 d. 1, 2, 3, 4, and 5

Following a balloon angioplasty to open a partially blocked coronary artery, a metal mesh tube known as a(n) ________ may be placed in the artery in order to keep it open. 

Fill in the blank(s) with the appropriate word(s).