(A) Furosemide is a loop diuretic. (B) Nitroglycerin is a vasodilator. (C) Lidocaine is the drug of choice to treat ectopic ventricular beats. (D) Digoxin slows down the electrical impulses and increases ventricular contractions, but it does not rapidly correct ventricular ectopy.

Explanation
(A) If cervical spine injury is suspected, the airway should be maintained using the jaw thrust method that also protects the cervical spine. (B) Primary intervention is protection of the airway and adequate ventilation. (C, D) All other interventions are secondary to adequate ventilation.

(A) The lungs are responsible for regulation of CO2, and this parameter primarily reflects respiratory function. (B) CO2 content of the blood is an indirect measure of respiratory function. (C) HCO3 is a measure of kidney function only and is important in acid-base balance. (D) Base excess represents the excess of HCO3 and is not reflective of respiratory function.

Explanation/Reference:
Explanation:
(A) MgSO4 is classified as an anticonvulsant drug. In preeclampsia management, MgSO4 is used for prevention of seizures. (B) MgSO4 has been used to inhibit hyperactive labor, but results are questionable.
(C) Negative side effects such as respiratory depression should not be confused with generalized sedation. (D) MgSO4 does not affect lung maturity. The infant should be assessed for neuromuscular and respiratory depression.

Explanation
(A) The second stage of labor is characterized by uterine contractions, which cause the client to bear down.
(B) Slow, deep, rhythmic breathing facilitates the laboring process. Hyperventilation is abnormal breathing resulting from loss of pain control. (C) The client should remain on bed rest during labor. (D) Contractions result in discomfort.