Which ion would be placed under the negative electrode?

A PA chest projection with poor positioning demonstrates vertical clavicles and the manubrium at the same level as the fifth thoracic vertebra. How was the patient mispositioned for such an image to be obtained?

a. The shoulders and elbows were not internally rotated. b. The shoulders were elevated. c. The patient's upper midcoronal plane was tilted toward the IR. d. The central ray was angled caudally.

When testing at home with a peak flow meter, the patient should perform the test a total of ___ times and record the best result

A) 2 B) 3 C) 4 D) 5