A client who had a knee replacement surgery and received a prescription for enoxaparin 30 mg subcutaneously every 12 hours for 10 days. The medication is available in 30 mg per 0.3 mL pre-filled syringes. How many mL should the practical nurse (PN) administer each day? (Enter numerical value only.)

A. Correct. The nurse should initiate continuous cardiac monitoring because a magnesium level of 2.7 mEq/L indicates hypermagnesemia, which can cause cardiac dysrhythmias, hypotension, and bradycardia.

B. Incorrect. The nurse should not administer potassium chloride to a client who has hypermagnesemia because it can worsen the condition by increasing the intracellular magnesium level and decreasing the serum calcium level.

C. Incorrect. The nurse should not provide a diet rich in legumes, nuts, and green vegetables to a client who has hypermagnesemia because these foods are high in magnesium and can increase the serum magnesium level.

D. Incorrect. The nurse should not monitor the client for tetany because tetany is a sign of hypomagnesemia, not hypermagnesemia. Hypomagnesemia can cause neuromuscular excitability, muscle spasms, and positive Chvostek's and Trousseau's signs.

A. Initiate droplet isolation precautions is incorrect because cystic fibrosis is not transmitted by droplets, but by autosomal recessive inheritance.

B. Keep the child on NPO status for 12 hr is incorrect because there is no indication for withholding oral intake in this child. The child needs adequate hydration and nutrition to prevent dehydration and malnutrition due to increased metabolic demands and mucus production.

C. Maintain the child on bed rest for 24 hr is incorrect because bed rest can worsen the child's respiratory status by decreasing lung expansion and increasing mucus retention. The child needs to be encouraged to ambulate and participate in activities as tolerated to promote airway clearance and prevent atelectasis and infection.

D. Administer high-dose antibiotic therapy is correct because the child has signs of a pulmonary infection, such as wheezing, productive cough, and thick sputum. Antibiotics are indicated to treat the infection and prevent complications such as pneumonia and bronchiectasis.