We report a case of renal vein thrombosis (RVT) and pulmonary embolism associated with diffuse membranous glomerulonephritis. A 44-year-old Japanese male was referred to the Nephrology Department with heavy proteinuria. Renal biopsy revealed diffuse membranous glomerulonephritis and we administered PSL 30mg/day and dipyridamole 300mg/day. Three weeks later, he was admitted with severe chest pain, dyspnea and massive proteinuria. RVT and pulmonary embolism were detected on CT scan and perfusion lung scan. After a few days of continuous intravenous unfractionated heparin (UFH) therapy, we used 72 U (anti-FXa)/kg of intravenous low-molecular-weight heparin (LMWH) every 12 hours for 10 days. He also received urokinase at the dose of 120,000 U/day for 4 weeks and long-term therapy with warfarin potassium at the dose of 3 mg/day. One month later, the thrombi in the pulmonary arteries and inferior vena cava disappeared on CT scan and perfusion lung scan. LMWHs have a longer biological half-life and a lower bleeding tendency than UFH for an equivalent antithrombotic effect. This case indicates that intermittent intravenous LMWH administration combined with urokinase is effective against RVT and pulmonary embolism without any side effect.

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