Correct Answer: A

Rationale: To calculate the mL to administer, divide the ordered dose (3 mg) by the concentration (4 mg/mL). 3 mg · 4 mg/mL = 0.75 mL. Rounding to the nearest tenth, the correct dose to administer is 0.8 mL.

Correct Answer: C

Rationale: In this scenario, if no urine is seen in the tubing after inserting the catheter, it is likely that the catheter is in the vagina rather than the bladder. Leaving the first catheter in place will help locate the meatus more easily when attempting the second catheterization. This approach ensures correct placement of the catheter in the bladder and minimizes the risk of causing unnecessary discomfort or trauma to the patient.

Correct Answer: B

Rationale: Edema in the fingers and hands can impede the proper functioning of the pulse oximeter, leading to a falsely low oxygen saturation reading. Edema alters the transmission of light through the tissues, affecting the accuracy of the measurement. Therefore, the presence of edema in the fingers and hands is the most likely factor contributing to the low oxygen saturation reading of 91%.

Correct Answer: C

Rationale: Keeping the drainage system below the level of the chest (C) is crucial to ensure proper drainage and prevent backflow of air or fluid into the chest cavity. This position helps maintain the integrity of the closed drainage system. Ensuring the chest tube remains unclamped at all times (A) allows for continuous drainage. Emptying the chest tube (B) should be done as needed, not routinely every 2 hours. Assessing for subcutaneous emphysema (D) is important but not the most critical action in this scenario.

Correct Answer: C

Rationale: When a client is on contact precautions due to an infected draining wound, it is important to prevent contact with wound secretions. Therefore, disposing of soiled dressings in securely closed plastic bags helps contain and prevent the spread of infectious material, reducing the risk of transmission to others in the household.