For patient with polycystic kidney disease and proteinuria who are on maximum dose of ACEi/ARB, what are other anti-proteinuric medications that should be considered?  

This is a great question because it highlights that patients with ADPKD should have proteinuria worked up as with any other patient with CKD - sometimes even by biopsy if needed (if tissue can be obtained safely, usually requiring urology and possibly using laparoscopic approach if ultrasound is not...