Which of the following clients is at the highest risk for developing delirium postoperatively?

Rationale: A. This client is considered an older adult but not in the highest-risk age group for delirium, which typically affects adults over 65 years, especially those over 70. Additionally, a routine dental procedure under local anesthesia is minimally invasive and generally does not trigger significant physiological stress, systemic inflammation, or prolonged sedation—all factors that can precipitate delirium. While any hospitalization or procedure carries some risk, this client’s profile does not indicate a strong predisposition. B. SAD is a type of mood disorder related to seasonal changes and does not inherently compromise cognitive reserve or brain vulnerability in the way age-related or neurocognitive conditions do. This client is young, likely without significant comorbidities, and the risk of delirium is extremely low. Psychiatric history alone is generally not sufficient to predispose a patient to postoperative delirium unless compounded by severe illness, medications, or extreme stressors. C. This client is middle-aged and healthy, with no underlying cognitive impairment, chronic illness, or functional decline. Healthy adults in this age group have strong cognitive reserve, and routine surgical procedures carry a minimal risk of delirium. Therefore, this client is at low risk. D. This client has multiple well-established risk factors for postoperative delirium. Advanced age (over 70) reduces cognitive reserve and brain resilience. Mild cognitive impairment indicates pre-existing brain vulnerability and increases susceptibility to acute cognitive disturbances. Urinary incontinence can signal frailty, reduced functional status, or other comorbidities that exacerbate delirium risk. Additional contributing factors may include polypharmacy, sensory deficits (hearing or vision impairment), infection, metabolic disturbances, or hospitalization-related stress. The combination of age, cognitive impairment, and functional decline makes this client the highest risk for postoperative delirium.