Correct Answer: B

Rationale: During a manic episode, individuals may experience heightened energy levels and reduced impulse control. Providing a structured environment with limited stimuli is the most appropriate nursing intervention. This approach helps reduce excessive stimulation and potential triggers for further escalation of manic behavior. It promotes a calming and controlled setting, assisting in managing symptoms and promoting the patient's well-being. Encouraging group activities (Choice A) may lead to overstimulation, allowing the patient to engage in physical activities freely (Choice C) could be risky due to impulsivity, and giving detailed tasks (Choice D) might overwhelm the individual.

Correct Answer: D

Rationale: Venlafaxine is classified as a serotonin-norepinephrine reuptake inhibitor (SNRI). SNRIs work by increasing the levels of both serotonin and norepinephrine in the brain, which helps alleviate symptoms of depression. This mechanism of action distinguishes SNRIs from other classes of antidepressants like SSRIs, TCAs, and MAOIs, making venlafaxine an effective choice for patients with major depressive disorder. Therefore, the correct answer is D. Choice A, SSRIs, primarily target serotonin reuptake only. Choice B, TCAs, work by inhibiting the reuptake of norepinephrine and serotonin, but they are not as selective as SNRIs. Choice C, MAOIs, inhibit the enzyme monoamine oxidase, leading to increased levels of various neurotransmitters, including serotonin and norepinephrine, but they are typically used as second- or third-line agents due to dietary restrictions and potential side effects.

Correct Answer: C

Rationale: The correct answer is dopamine. Dopamine dysregulation is a key factor in the development of schizophrenia. Excess dopamine activity in certain brain regions is associated with positive symptoms of schizophrenia, such as hallucinations and delusions. Dopaminergic medications that reduce dopamine levels are often used to manage these symptoms, further supporting the role of dopamine in schizophrenia. Serotonin (Choice A) is more commonly associated with mood regulation and is implicated in depression and anxiety disorders. Norepinephrine (Choice B) is involved in the body's 'fight or flight' response and is linked to conditions like anxiety and PTSD. Acetylcholine (Choice D) plays a role in muscle movement and memory but is not primarily implicated in schizophrenia.

Correct Answer: B

Rationale: In managing a patient with OCD engaging in ritualistic behaviors like handwashing, the nurse's best initial response is to allow the ritual but set limits on the duration. This approach helps in managing the behavior while gradually working towards reducing its frequency. Interrupting the ritual abruptly may cause distress to the patient, ignoring the behavior may reinforce it, and encouraging the patient to stop the ritual without setting limits may not be as effective in the initial stage of intervention.

Correct Answer: B

Rationale: During a panic attack, the priority intervention for the nurse is to provide reassurance and stay with the patient. This action helps reduce fear and provides a sense of safety, which can aid in calming the patient and preventing further escalation of the panic attack. Encouraging the patient to verbalize their feelings (Choice A) may be beneficial after the acute phase of the panic attack. Leaving the patient alone (Choice C) may increase feelings of abandonment and escalate the panic attack. Distracting the patient with a task (Choice D) is not recommended during a panic attack as it may divert attention but not address the underlying anxiety and fear.