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Bipolar II disorder is defined by at least one major depressive episode and at least one hypomanic episode. Hypomania lasts at least 4 days, with elevated or irritable mood and increased energy, but without psychosis or significant functional impairment. Bipolar I requires at least one manic episode, lasting ≥7 days or requiring hospitalization. Cyclothymic disorder involves fluctuating hypomanic and depressive symptoms for ≥2 years, not meeting criteria for full episodes. Major depressive disorder has depressive episodes without hypomania or mania. Treatment of bipolar II involves mood stabilizers (lithium, valproate, lamotrigine) and atypical antipsychotics. Antidepressant monotherapy is avoided to prevent mood switching.

Erythema multiforme is an acute hypersensitivity reaction often triggered by infections (especially HSV and Mycoplasma pneumoniae) or certain drugs. It presents with targetoid lesions consisting of concentric rings with a central dusky area. Lesions are usually symmetric on extremities but may also appear on mucous membranes. Stevens–Johnson syndrome and toxic epidermal necrolysis involve widespread epidermal necrosis and detachment with mucosal involvement, distinguished by body surface area involvement (<10% SJS, >30% TEN). Psoriasis presents with well-demarcated erythematous plaques with silvery scale, not target lesions. Management of erythema multiforme is supportive, with treatment of the underlying trigger (e.g., antiviral therapy for HSV). It is important to differentiate from life-threatening SJS/TEN.

Relative risk (RR) compares the probability of an outcome in the treatment group vs control. Here, RR = 0.75 means the treatment group had a 25% relative reduction in mortality. The 95% confidence interval (0.60–0.95) does not include 1, indicating the reduction is statistically significant. Thus, the drug is effective in reducing mortality. If the CI included 1, the result would be nonsignificant. If the entire CI were above 1, the drug would increase mortality. Confidence intervals provide both statistical significance and precision: narrower intervals suggest greater certainty. This trial demonstrates both statistical significance and clinical importance, assuming no major bias or confounding. Clinical adoption would weigh efficacy against cost and side effects.

Rheumatoid arthritis (RA) is a chronic autoimmune polyarthritis characterized by symmetric involvement of small joints (MCP, PIP, wrists) with prolonged morning stiffness and systemic inflammation. Extra-articular manifestations are common, reflecting systemic immune activation. Rheumatoid nodules—firm, non-tender subcutaneous swellings over pressure points (e.g., elbows)—are highly specific for RA and are associated with severe, seropositive disease. They consist of necrotizing granulomas with palisading histiocytes. Uveitis is more characteristic of seronegative spondyloarthropathies such as ankylosing spondylitis. Psoriatic plaques occur in psoriatic arthritis, not RA. Tophi (urate crystal deposits) are seen in chronic gout. Other RA complications include interstitial lung disease, pericarditis, anemia of chronic disease, and vasculitis. Early treatment with disease-modifying antirheumatic drugs (DMARDs) such as methotrexate is crucial to prevent irreversible joint damage.

Justice is the ethical principle of fairness in healthcare delivery. It requires that patients receive care equitably, regardless of socioeconomic status, race, gender, or insurance coverage. In this scenario, the physician upholds justice by providing equal care to both insured and uninsured patients. Autonomy relates to respecting patient choices. Beneficence is acting in the patient’s best interest, and nonmaleficence is avoiding harm. Justice is particularly important in systems where access to care is unequal. Physicians are ethically obligated to treat patients without discrimination and to advocate for fair allocation of healthcare resources.