Today’s broad collection is linked by one discipline: match the intervention to the mechanism, and the evidence to the decision. That means targeting blood-sharing networks rather than counting tests alone, correcting loading conditions before grading tricuspid disease, reconsidering psychiatric labels when neurological signs evolve, and separating genetic association from prediction after paediatric concussion.

The public-health material begins with Fiji’s rapidly escalating HIV and hepatitis C epidemic. Unsafe injecting practices now drive much of the increase, particularly group injecting, reused needles and syringes, and shared preparation equipment contaminated with blood. Sexual and vertical transmission are also increasing, so a response confined to one risk group will miss the widening epidemic. Point-of-care testing matters because long referral pathways lose people before treatment, but free testing alone is not enough when enrolment and retention remain poor. Rapid testing should connect directly to treatment and active follow-up, while peer-led needle and syringe programmes, condoms, post-exposure prophylaxis and pre-exposure prophylaxis address complementary routes of transmission. Constitutional or respiratory symptoms in someone with HIV require urgent assessment for tuberculosis and other opportunistic infections.

The cardiovascular thread spans acquired valve disease and post-infectious inflammation. Tricuspid regurgitation may arise from primary leaflet disease, right atrial and annular dilatation, right ventricular remodelling, or interaction with a device lead. It is dynamic: congestion changes annular and ventricular dimensions, and gut oedema may reduce oral diuretic absorption. Severe regurgitation should therefore be reassessed after euvolaemia rather than graded once during marked fluid overload. Three-dimensional echocardiography can clarify leaflet anatomy and lead interaction, while other imaging and right-heart catheterisation answer procedural and haemodynamic questions. Intervention depends on symptoms, right ventricular reserve, pulmonary haemodynamics, anatomy and operative risk, not simply the size of the regurgitant jet.

Acute rheumatic fever requires a different sequence. Fever, migratory large-joint inflammation, carditis, erythema marginatum, subcutaneous nodules or Sydenham chorea usually appear two to four weeks after group A streptococcal pharyngitis. Diagnosis combines evidence of recent streptococcal infection with the Jones criteria; arthralgia should not be double-counted when arthritis is present, and a prolonged PR interval should not be counted when carditis is already established. Acute treatment includes anti-inflammatory therapy and penicillin, while long-term penicillin prophylaxis reduces recurrence.

The multisystem material reinforces deliberate cross-system questioning. Behçet disease is a relapsing vasculitis rather than simply recurrent mouth ulceration. Genital ulcers, skin lesions, uveitis, focal neurological symptoms, venous thrombosis and arterial complications all change urgency and treatment. Painful red eyes or visual disturbance need urgent ophthalmology assessment, while haemoptysis and pleuritic pain may signal a pulmonary artery aneurysm requiring arterial imaging. The International Criteria can organise findings, but no single laboratory test confirms the diagnosis and important mimics still need exclusion.

Neurological uncertainty is handled through tempo, collateral history and repeated examination. Behavioural change, mutism or catatonia-like features can anchor clinicians on psychiatric illness, intoxication or sepsis. Hypophonia, vertical gaze restriction, blepharospasm, rigidity, early postural instability and orthostatic hypotension instead point towards atypical parkinsonism; the eye movement and postural findings favour progressive supranuclear palsy, while prominent autonomic dysfunction also raises multiple system atrophy. A partial response to lorazepam or levodopa is additional evidence, not a stand-alone diagnosis. Dopamine-blocking drugs may worsen or expose pre-existing hypokinetic features.

The paediatric headache evidence update provides a counterweight to overconfident interpretation. In 646 children and adolescents followed after concussion or orthopaedic injury, family history of migraine is associated with worsening post-traumatic headache severity in only two of five models. The overall migraine polygenic risk score shows no association, while four of 40 individual variants are linked to increasing severity. These are mixed associations, not a deterministic explanation or validated clinical prediction rule. Follow-up should still document headache trajectory rather than use genetic findings as a stand-alone forecast.

Several episodes focus on proportionate long-term care. Cancer-associated malnutrition can occur at any body size, so a high body mass index does not cancel clinically important weight or muscle loss. A fall of 5% or more should prompt assessment of trajectory, appetite, swallowing, gastrointestinal symptoms, muscle function and continuing loss. Food-first support, tolerated oral nutritional supplements and early dietetic input can help preserve muscle and treatment tolerance. Supervised pre-operative weight reduction must also protect muscle rather than become unsupervised rapid restriction.

Community alcohol withdrawal depends on selection and continuity rather than convenience alone. Safe home treatment needs recent clinical information, a reliable support person, pharmacy coordination, daily monitoring, nutrition and thiamine, and clear escalation routes. Recovery extends beyond a short detoxification course: familiar clinicians, rapid review after a lapse, counselling or peer support and established anti-craving medicines can reduce fragmentation. A lapse should identify triggers and refine the plan, while glucagon-like peptide-1 receptor agonists remain an emerging, unproven option rather than a replacement for established care.

The remaining outpatient and procedural material illustrates the same principle. Keratosis pilaris is a benign, non-infectious follicular disorder; reassurance, gentle cleansing and regular emollients are appropriate, with keratolytic preparations or a topical retinoid reserved for troublesome texture or redness. Advanced endoscopic procedures are anatomy-specific. Anti-reflux mucosal therapy cannot repair a substantial hiatal hernia, oesophageal plication should follow exclusion of residual outflow obstruction, and duodenal mucosal resurfacing is presented primarily as a glycaemic rather than major weight-loss intervention. Consent should include stricture, perforation, repeat procedures, uncertain durability and possible later surgery.