Primary IgA nephropathy in the Kashmiri population

Abstract

IgA nephropathy (IgAN) remains one of the most common glomerular lesions, which has a striking geographic distribution and is the most common form of primary glomerular disease in Asia. However, the exact prevalence or clinicopathological spectrum of IgAN in India is not well documented. This retrospective study analyzed the presentation in 126 patients of primary IgAN out of 298 native kidney biopsies (42.28%) performed over a period of three years (2013–2015). The patients were followed up for three months. This is the second highest prevalence recorded in the world after Japan. Among the clinical features of our cohort, the mean age was 31 years, with a male-to-female ratio of 2:1, with the highest incidence observed in the third decade of life in both sexes. The majority of our patients (47%) presented with renal failure with a mean serum creatinine value of 3.1 mg/dL and with burnt out morphology on histo-pathology; 72.2% of patients were hypertensive at presentation. On histopathology, Haas class V (35.5%) had the highest frequency followed by class IV (25.8%). The Oxford MEST score was not applicable in 36 patients because of advanced sclerosis (>50%). In the remaining ninety patients, majority had tubular atrophy and interstitial fibrosis of varying degrees. At three months of follow-up, the patients who had presented with renal failure (47.6%), settled in chronic kidney disease stage III (25.4%) followed by stage IV (18.6%) and stage V (11.8%). Our study in Kashmir suggests that IgAN is more common in the younger age group, with a significant number of patients presenting with advanced renal failure and, on morphology, showing a burnt out disease, with many developing end-stage renal disease. Studies evaluating the underlying factors can have immense importance in dealing with the disease.