A client who has been prescribed risperidone displays signs of pseudoparkinsonism. What is the priority action the nurse should take?

Choice A reason: Deep breathing exercises stimulate the vagus nerve, which activates the parasympathetic nervous system. This reduces heart rate, lowers blood pressure, and decreases cortisol levels. For a client with a psychotic disorder, reducing this physiological arousal can help mitigate the intensity of hallucinations or delusions exacerbated by stress.

Choice B reason: Deep breathing exercises are designed to induce a state of calm and tranquility rather than increased alertness or hyper-vigilance. While mindful breathing can improve focus, its primary therapeutic utility in stress management for psychiatric populations is the reduction of the "fight or flight" response.

Choice C reason: There is no clinical evidence that deep breathing exercises increase dopamine receptor activation. In fact, in psychotic disorders, the goal is often to modulate or decrease overactive dopaminergic pathways. Deep breathing is a peripheral nervous system intervention and does not directly target dopamine receptor sensitivity in the brain.

Choice D reason: Deep breathing is intended to be the physiological opposite of the high-stress state. High stress is characterized by shallow, rapid chest breathing (tachypnea). Slow, diaphragmatic breathing disrupts the feedback loop of anxiety, signaling the brain that the environment is safe, thereby reducing the psychological perception of threat.

Choice A reason: Fidelity refers to the nurse's obligation to be faithful to commitments and to keep promises made to the patient. It focuses on the individual nurse-patient relationship and the maintenance of trust through loyalty and veracity rather than the broader societal distribution of healthcare resources.

Choice B reason: Nonmaleficence is the ethical duty to "do no harm." In a psychiatric context, this involves protecting patients from injury, medication errors, or unnecessary restraints. While essential for bedside care, it does not directly address the systemic allocation of resources or social equity.

Choice C reason: Autonomy involves respecting the patient's right to make their own decisions regarding their treatment and healthcare. While advocacy can support autonomy by providing information, the specific act of seeking equal access for a whole population is a matter of distributive fairness.

Choice D reason: Justice is the ethical principle that focuses on fairness and the equitable distribution of benefits and burdens. When a nurse advocates for equal access to mental health resources regardless of socioeconomic status, race, or geography, they are promoting social and distributive justice within the healthcare system.