Epidemiological, Clinical and Morphological Characteristics of Immunoglobulin a Nephropathy in Latvia

Immunoglobulin A nephropathy (IgAN) is the most common chronic glomerulopathy with variable clinical manifestations. IgAN diagnostics became possible in Latvia in 2013. The study aim was to describe IgAN manifestations in the Latvian population by analysing epidemiological, clinical, histological data, and reveal factors that might determine the course of the disease. The retrospective, one-centre study included biopsy-proven IgAN patients over a five-year period in the Nephrology Centre at Pauls Stradiņš Clinical University Hospital. Data from inpatient and outpatient medical records were collected. The study included 69 patients with histologically confirmed IgAN (23% of all renal biopsies): 52% men with mean age of 37. More than a half of them had hypertension, changes in urinalysis and kidney structure, and GFR < ml/min before the biopsy. Pathology data stratified by MEST-C score were: M1 (93%), E1 (5%), S1 (81%), T1 and T2 (24%), C1 (18%). 20% started renal replacement therapy (RRT). Proteinuria, obesity, hyperuricemia, high total MEST-C score, and low serum C3 were associated with a worse prognosis. As a significant part of patients start RRT in the five-year period after the biopsy, the disease course is not benign. IgAN in the study population was diagnosed with clinical and histological signs of advanced disease.