(A) This is the correct method of teaching diaphragmatic breathing, which allows full lung expansion to increase oxygenation, prevent atelectasis, and move secretions up and out of the lungs to decrease risk of pneumonia. (B) Quick, short breaths do not allow for full lung expansion and movement of secretions up and out of the lungs. Quick, short breaths may lead to O2 depletion, hyperventilation, and hypoxia. (C) Expelling breaths through the nose does not allow for full lung expansion and the use of diaphragmatic muscles to assist in moving secretions up and out of the lungs. (D) Inhaling and exhaling at a rate of 20-24 times/min does not allow time for full lung expansion to increase oxygenation. This would most likely lead to O2 depletion and hypoxia.

Explanation/Reference:
Explanation:
(A) MgSO4is a central nervous system depressant. Loss of reflexes is often the first sign of developing toxicity. (B) Urinary output at <25 mL/hr or 100 mL in 4 hours may result in the accumulation of toxic levels of magnesium. (C) The therapeutic serum range for MgSO4is 6-8 mg/dL. Higher levels indicate toxicity.
(D) Respirations of>16 breaths/min indicate that toxic levels of magnesium have not been reached.
Medication administration would be safe.

Section: Questions Set F
Explanation:
(A) This response uses the principle of reality orientation by the nurse telling the client that he or she does not see anything, but it does recognize his feelings. (B) This response does not make it clear that the nurse does not see anyone else in the room, and the nurse leaves the client alone to continue hallucinating. (C) This response leaves room for doubt; the nurse is further confusing the client by this statement. (D) This response reinforces the hallucination and implies that the nurse sees his mother, too.

Explanation
(A) Diaphanography, also known as transillumination, is a painless, noninvasive imaging technique that involves shining a light source through the breast tissue to visualize the interior. It must be used in conjunction with a mammogram and physical examination. (B) Mammography is a useful tool for screening but is not considered a means of diagnosing breast cancers. (C) Thermography is a pictorial representation of heat patterns on the surface of the breast. Breast cancers appear as a "hot spot" owing to their higher metabolic rate.
(D) Biopsy either by needle aspiration or by surgical incision is the primary diagnostic technique for confirming the presence of cancer cells.

Explanation
(A) Wheezing occurs during expiration when air movement is impaired because of constricted edematous bronchial lumina. (B) Respirations are difficult, but the rate is frequently normal. (C) The circumoral area is usually pale. Cyanosis is not an early sign of hypoxia. (D) Expiration is prolonged because the alveoli are greatly distended and air trapping occurs.