What are the common causes of urinary tract obstruction? What are the effects on the kidneys and lower urinary tract? What is uremia? What are its manifestations? How is it treated? What is the role...

What are the common causes of urinary tract obstruction? What are the effects on the kidneys and lower urinary tract?

What is uremia? What are its manifestations? How is it treated? What is the role of urea in producing the clinical manifestations of uremia?