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IgA Nephrоpаthy (Berger Diseаse) (Study Outline) 1. Bаckgrоund Definitiоn: Primary glomerular disease caused by IgA immune complex deposition in the mesangium. Epidemiology: Most common primary glomerulonephritis worldwide; affects adolescents/young adults more frequently. Pathophysiology: Aberrant IgA1 production → immune complex formation → mesangial deposition → complement activation (alternative pathway) → glomerular inflammation. Classification: Can be isolated renal disease or part of systemic IgA vasculitis (Henoch–Schönlein purpura). Clinical pattern: Often causes recurrent episodes of hematuria, usually triggered by infections. 2. History Gross hematuria shortly after URI (within 1–2 days; contrasts with post-strep GN which occurs weeks later). Recurrent episodic hematuria—classic presentation. Possible flank discomfort with hematuria. Proteinuria may develop; severity varies. Secondary associations: liver disease, celiac disease, inflammatory bowel disease. Signs of progression: fatigue, edema, or hypertension if CKD develops. 3. Exam Findings Often mild or normal exam in early disease. Possible findings: Low-grade edema (periorbital or peripheral). Hypertension if significant renal impairment. Purpura, abdominal pain, arthralgia in IgA vasculitis (systemic form). 4. Making the Diagnosis Urinalysis: Hematuria, often microscopic between episodes. Proteinuria (variable; worsening proteinuria = poor prognosis). Serology: Serum IgA may be elevated but not diagnostic. Complement levels typically normal (distinguishes from post-strep GN). Renal function tests: BUN/Cr may be normal early; elevated with progression. Renal biopsy (definitive): Shows mesangial proliferation and IgA deposition on immunofluorescence. Key for prognosis and determining treatment path. Gold Standard: Renal biopsy demonstrating IgA deposition in the mesangium. 5. Management (Exam Concepts) General principles: Address BP control; adjust medications for reduced GFR; avoid nephrotoxins. Sodium restriction concepts for edema/hypertension. Proteinuria control (high-yield): RAAS modulation principles to reduce proteinuria and slow progression. Immunosuppression concepts: Considered in cases with rapid progression or heavy proteinuria (exam-level concept only; no regimen details). Management of systemic IgA vasculitis: Supportive principles; immunosuppression in severe renal involvement. Monitoring: Follow urine protein levels, BP, and renal function to detect progression. Indications for nephrology referral: Heavy proteinuria, declining GFR, or suspicion for rapidly progressive disease. QUESTION A 24-year-old man with biopsy-confirmed IgA nephropathy is being seen for routine follow-up. He reports no current symptoms. Blood pressure is 146/92 mmHg. Urinalysis shows persistent hematuria and 1+ proteinuria. Serum creatinine is 1.2 mg/dL. The clinician discusses strategies to slow disease progression and reduce proteinuria. Which of the following is the most appropriate next step in management? A) Begin corticosteroid therapyB) Start an ACE inhibitorC) Prescribe a low-protein dietD) Refer for dialysis access placement