Correct Answer: A

Rationale: The correct answer is A: A clot can enter the circulation. When a clotted cannula is aggressively flushed, the force can dislodge the clot, allowing it to enter the circulation and potentially leading to serious complications such as embolism. Incorrect choices: B: An air embolism can enter the circulation - In the context of a clotted cannula, air embolism is less likely compared to a clot entering the circulation. C: A painful arterial spasm can occur - Arterial spasm is a potential complication but not directly related to flushing a clotted cannula. D: Fluid extravasation into surrounding tissue can occur - Flushing a clotted cannula may not specifically lead to fluid extravasation, as it is more related to needle dislodgement or improper placement.

Correct Answer: A

Rationale: Correct Answer: A - Cerebral edema Rationale: 1. SIADH leads to water retention and dilutional hyponatremia. 2. Diuretic therapy aims to increase urine output and correct fluid imbalance. 3. If the client does not comply, excessive water retention can lead to cerebral edema. 4. Cerebral edema is a serious complication that can cause neurological deficits. Summary: - B: Severe hyperkalemia is unlikely as diuretics would help excrete excess potassium. - C: Hypovolemic shock is not expected as fluid restriction may prevent rapid volume loss. - D: Tetany is not a direct consequence of non-compliance with treatment for SIADH.

Correct Answer: B

Rationale: The correct answer is B: Pupil responses. During an ophthalmic assessment, observing pupil responses is crucial as it provides information on the function of the cranial nerves and potential neurological issues. Pupil size, shape, symmetry, and reaction to light are key indicators of eye health. A: Level of central vision - While important, assessing the level of central vision is typically done by the ophthalmologist and not within the scope of the nurse's role in a routine assessment. C: External eye appearance - Although external eye appearance can give some clues about eye health, it is not as direct and crucial as observing pupil responses. D: Eye movements - While eye movements can provide information on ocular motor function, it is not as critical as assessing pupil responses in an ophthalmic assessment.

Correct Answer: B

Rationale: The correct answer is B: Re-exposure to a specific antigen. Memory cells are formed after initial exposure to an antigen. Upon re-exposure to the same antigen, memory cells quickly recognize and respond, converting into plasma cells to produce antibodies. This process is known as secondary immune response. Incorrect choices: A: An organ transplant - Organ transplant does not involve the conversion of memory cells to plasma cells. C: Release of lymphokines - Lymphokines are signaling molecules secreted by immune cells but do not directly cause memory cells to convert to plasma cells. D: Initial exposure to an antigen - Initial exposure to an antigen leads to the formation of memory cells, not their conversion to plasma cells upon re-exposure.

Correct Answer: D

Rationale: The correct answer is D: Emphasize the completion of the entire course of drug therapy. Empyema is a serious condition that requires antibiotic treatment. Emphasizing the completion of the entire course of drug therapy is crucial to ensure that the infection is completely eradicated and to prevent the development of drug-resistant strains. Teaching breathing exercises (choice A) may help improve lung function but is not the primary intervention for empyema. Offering assurance that empyema takes less time to resolve (choice B) is incorrect as it can mislead the client about the seriousness of the condition. Recommending a balanced but light diet (choice C) may be beneficial for overall health but is not directly related to treating empyema.