The patient has an order for a single dose of ceftriaxone 400 mg IM. The final concentration is 500 mg/1.2 ml. How many milliliters will you administer? (Round to the nearest hundredth.)
The Correct Answer is ["0.96"]
Ordered dose = 400 mg
Available = 500 mg in 1.2 mL
Step 1: Use the formula
Volume to administer = (Ordered dose ÷ Available dose) × Volume available
Step 2: Substitute the values
Volume = (400 ÷ 500) × 1.2
Step 3: Calculate
Volume = 0.8 × 1.2 = 0.96 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. A threatened miscarriage is characterized by vaginal bleeding, mild cramping, and a closed cervix, but the fetus is still viable with a detectable heartbeat. In this case, the fetal heartbeat is absent, making a threatened miscarriage unlikely.
B. An incomplete miscarriage occurs when some products of conception have been expelled while others remain in the uterus. It is usually accompanied by heavy bleeding, cramping, and an open cervix. This client has a closed cervix and no bleeding, ruling out an incomplete miscarriage.
C. A missed miscarriage occurs when the fetus has died in utero but has not been expelled. The client may have no symptoms—no bleeding or cramping—and the cervix remains closed. Ultrasound confirms the absence of fetal cardiac activity, which matches this presentation. Missed miscarriages often require medical or surgical management to prevent complications such as infection or coagulopathy.
D. An inevitable miscarriage is indicated by vaginal bleeding, cramping, and cervical dilation, suggesting that miscarriage is in progress and cannot be prevented. Since this client has a closed cervix and no active bleeding, an inevitable miscarriage is unlikely.
Correct Answer is B
Explanation
A. Infants actually have smaller airway diameters and less lung volume than adults. A larger airway and fully developed lungs would decrease susceptibility to respiratory compromise, not increase it.
B. Infants’ airways are narrow, so even minor swelling or mucus buildup can significantly obstruct airflow. Additionally, respiratory muscles, including the diaphragm and intercostals, are immature and fatigue easily, making it harder for infants to maintain adequate ventilation during illness or stress. These factors increase the risk of rapid respiratory compromise.
C. Infants have fewer alveoli and less surface area for gas exchange, and their respiratory muscles are weaker than adults, not stronger. This contributes to increased risk, not protection.
D. The diaphragm is less developed in infants, and their chest wall is more compliant, which can lead to paradoxical movements and less effective ventilation. Increased diaphragm development and lung compliance would enhance respiratory function, not increase susceptibility.
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