An early complex that breaks the regularity of the underlying rhythm and that is characterized by a narrow QRS complex and an upright P wave that differs in shape and size from the P waves of the other complexes MOST accurately describes a(n):

An AP thoracic projection obtained with the patient rotated toward the left side demonstrates

1. the spinous processes positioned closer to the right side. 2. a greater distance from the right pedicle to the spinous process than from the left pedicle to the spinous process. 3. the right SC joint superimposed over the vertebral column. 4. closed intervertebral disk spaces. a. 1 and 3 only b. 2 and 3 only c. 1, 2, and 3 only d. 4 only

PPOs ________ require referrals to specialists.

A. May B. Do not C. Do D. Always