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Q J Med 1995; 88: 785-793
© 1995 Association of Physicians

Clinical features and outcome of patients with thin and ultrathin glomerular membranes

S. GOEL, A. DAVENPORT, N.P. GOODE1, M. SHIRES1, C.L. HALL2, P.R. HARRISON and A.G. MACIVER3

Departments of Renal Medicine Bristol 1 St James's University Hospital Leeds 2 Royal United Bath Hospital Bath, UK 3 Pathology, Southmead Hospital Bristol

Received 20 March 1995 Accepted for publication 13 April 1995.


  Abstract

There is considerable disagreement regarding the natural history of renal disease associated with thin glomerular basement membranes (TGBM). We followed 43 patients (19 male), mean age41.6 years (range 19–73) for a mean of 88 months (48–140). TGBM was recognized in adults when glomerular basement membrane thickness, measured from multiple sites in electronmicrographs of renal biopsy tissue as the harmonic mean, was <320 nm. At presentation, 95% had microscopic haematuria, 12% macroscopic haematuria, 14% loin pain, 28% proteinuria, and 14% hypertension. There was no difference in GBM width between the sexes (male 258 nm vs. female 251 nm) but there was a significant negative correlation between age and GBM width (r=–0.53, p<0.001), with older patients having the thinnest membranes. Twenty six patients had ultrathin GBM (<270 nm), of whom 54% had 3$ haematuria vs. 12% of the group with BM >270 nm (p<0.01). In the ultrathin group, 71% had loss of anionic charge from the GBM, vs. 17% in those with membranes which were thin but >270 nm (p<0.05). Proteinuria occurred more frequently in those with GBM >270 nm, 65% vs. 8% in the ultrathin group (p<0.01). Thin GBM were associated with a benign prognosis, as after a mean follow-up of 85 months (48–140), there was no significant change in either serum creatinine or mean arterial blood pressure. Patients with ultrathin GBM had greater loss ofGBM anionic charge, which might result in both an alteration of flow characteristics within the glomerular capillaries and also increased fragility of the glomerular basement membrane withlikelihood of rupture and resultant macroscopic haematuria.


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