Chapter 51: Renal System

Students learn how antidiuretic hormone and the renin-angiotensin-aldosterone system regulate water and sodium balance, and how the kidneys maintain acid-base equilibrium through bicarbonate regulation and buffering mechanisms. The chapter then transitions to clinical assessment, presenting diagnostic procedures including serum creatinine and blood urea nitrogen measurement, glomerular filtration rate calculation, urinalysis interpretation, and imaging studies such as renal ultrasound and computed tomography. Students explore acute kidney injury across its prerenal, intrarenal, and postrenal categories, recognizing distinguishing laboratory patterns and clinical progression through oliguric and recovery phases. Chronic kidney disease receives detailed attention, including stage classification based on glomerular filtration rate, systemic complications including uremic syndrome, and management principles. Renal replacement therapies constitute a major focus, with hemodialysis and peritoneal dialysis presented side-by-side for comparison of mechanisms, vascular access considerations, catheter management, and serious complications like air embolism and peritonitis. The chapter addresses electrolyte imbalances common in renal dysfunction, particularly hyperkalemia and hyperphosphatemia, along with corresponding nursing interventions and dietary modifications. Infectious and obstructive conditions including urinary tract infections, pyelonephritis, and nephrolithiasis are discussed with emphasis on prevention and treatment strategies. Kidney transplantation concludes the clinical disorders section, covering donor selection, immunosuppressive therapy, and recognition of acute and chronic rejection. Throughout, client education priorities emphasize fluid restriction adherence, dietary modifications, symptom monitoring, and medication compliance necessary for optimal renal health outcomes.