Pathophysiology
Clinical meaning
Goodpasture syndrome (anti-glomerular basement membrane disease) is an autoimmune condition in which circulating IgG antibodies target the alpha-3 chain of type IV collagen in the glomerular and alveolar basement membranes, causing rapidly progressive glomerulonephritis and diffuse alveolar hemorrhage. The anti-GBM antibodies bind the basement membrane, activate complement, and recruit neutrophils, causing a linear pattern of immunoglobulin deposition on immunofluorescence (distinguishing it from granular immune complex deposition in other glomerulonephritides). Pulmonary hemorrhage presents with hemoptysis, dyspnea, and bilateral alveolar infiltrates, while renal involvement causes hematuria, proteinuria, and rapidly declining renal function. The nurse monitors respiratory status (oxygen saturation, hemoptysis volume, respiratory rate), assesses renal function (urine output, creatinine, urinalysis for red blood cell casts), assists with plasmapheresis (to remove circulating anti-GBM antibodies), administers prescribed immunosuppressive therapy (cyclophosphamide and corticosteroids), monitors for complications of immunosuppression, and recognizes that prognosis depends heavily on the degree of renal damage at presentation.