Correct Answer: C

Rationale: The correct answer is C because respiratory rate is an observable and measurable data point, making it objective. Objective data is factual and observable, such as vital signs. Choices A, B, and D are subjective data as they rely on the patient's perception or interpretation, which can be influenced by various factors and may not always be accurate or reliable. In this case, the nurse can directly measure and document the patient's respiratory rate, making it an objective piece of information.

Correct Answer: A

Rationale: The correct answer is A: Use aseptic technique for the insertion site. Aseptic technique is necessary to prevent infection when accessing the intracranial pressure monitoring system. Aseptic technique involves maintaining a sterile field during the insertion process, reducing the risk of introducing pathogens. Using clean technique for cleansing connections (choice B) may introduce contaminants to the insertion site. Sterile technique for cleansing the insertion site (choice C) is not necessary and may be overly stringent. Closing leaks in the tubing with tape (choice D) does not address the prevention of infection at the insertion site.

Correct Answer: D

Rationale: The correct answer is D: Sigmoidoscopy. Sigmoidoscopy is a direct visualization procedure that allows for examination of the lower part of the colon and rectum, where colorectal cancer commonly occurs. This procedure can help identify any abnormal growths or polyps that may indicate cancer. Stool hematest (A) detects blood in stool but does not confirm colorectal cancer. Abdominal CT (B) provides imaging of the abdomen but may not definitively diagnose colorectal cancer. CEA scan (C) measures a tumor marker associated with colorectal cancer but is not a definitive diagnostic test. Thus, sigmoidoscopy is the most appropriate diagnostic study for confirming colorectal cancer.

Correct Answer: C

Rationale: The correct answer is C (280 to 295mOsm/kg) because serum osmolality is primarily determined by sodium, glucose, and blood urea nitrogen levels. Normal serum sodium range is 135-145 mEq/L, which corresponds to an osmolality range of 280-295 mOsm/kg. Choices A and B are incorrect as they do not align with normal serum sodium levels. Choice D is incorrect as it includes an excessively wide range that is not consistent with normal osmolality values.

Correct Answer: B

Rationale: The correct answer is B because monitoring for swelling and heaviness of legs is essential in preventing falls, which can be caused by conditions like edema or circulatory issues. Swollen or heavy legs can affect mobility and balance, increasing the risk of falls. This intervention helps identify potential issues early and implement preventive measures. Choice A is incorrect as monitoring for chest pain and LDL levels pertains more to cardiovascular health than fall prevention. Choice C is incorrect because monitoring postural changes in BP is important for managing hypertension, not necessarily for preventing falls. Choice D is incorrect as monitoring temperature for mild fever is more related to identifying infections rather than preventing falls.