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RENAL TUBULAR, INTERSTITIAL,
AND VASCULAR KIDNEY DISEASES
OVERVIEW| NURSING| MEDICINE
GUARANTEES SUCCESS
What does ATI stand for? - Answer-Acute Tubular Injury What is the most common cause of acute renal failure? - Answer-Acute Tubular Injury (ATI) What percentage of acute renal failure cases in hospitalized patients is due to ATI? - Answer-50% Name one cause of ischemia leading to Acute Tubular Injury. - Answer-Shock, circulatory collapse, dehydration, malignant hypertension, vasculitis, or hypercoagulable states. What type of injury can lead to Acute Tubular Injury besides ischemia? - Answer-Direct toxic injury from drugs, radiocontrast dyes, myoglobin, hemoglobin, or radiation. What is a key feature of tubular epithelial cells in relation to ischemia? - Answer-They are particularly sensitive to ischemia due to high metabolic demand. What happens to membrane proteins in tubular cells during ischemia? - Answer-There is a reversible loss of cell polarity with redistribution of membrane proteins. What is the effect of abnormal ion transport in tubular cells? - Answer-Increased sodium delivery to distal tubules causing vasoconstriction. What cytokines and molecules do ischemic tubular cells express? - Answer-Cytokines and adhesion molecules that recruit leukocytes. What is a consequence of injured tubular cells detaching from the basement membrane? - Answer-Luminal obstruction, increased intratubular pressure, and decreased GFR. What are the three phases of the clinical course of Acute Tubular Injury? - Answer- Initiation phase, Maintenance phase, Recovery phase.
What characterizes the initiation phase of Acute Tubular Injury? - Answer-Slight decline in urine output and a rise in BUN. What occurs during the maintenance phase of Acute Tubular Injury? - Answer-Oliguria, salt and water overload, hyperkalemia, metabolic acidosis, and rising BUN. What indicates the recovery phase of Acute Tubular Injury? - Answer-Rising urine volumes with water, sodium, and potassium losses. What distinguishes Tubulointerstitial Nephritis (TIN) from primary glomerular diseases?
- Answer-Absence of nephritic or nephrotic syndromes. What are common symptoms of Tubulointerstitial Nephritis? - Answer-Azotemia, polyuria, salt wasting, or defective acid excretion. What is the most common cause of pyelonephritis? - Answer-Ascending infection from the bladder. What organisms are most commonly responsible for urinary tract infections? - Answer- Normal gram-negative bacilli inhabitants of the GI tract. Why are UTIs more common in women? - Answer-Due to a shorter urethra and hormonal changes affecting bacterial adherence. What are some risk factors for urinary tract infections? - Answer-Long-term catheterization, vesicoureteral reflux, pregnancy, diabetes mellitus, and lower urinary tract obstructions. What is acute pyelonephritis characterized by? - Answer-Patchy, suppurative inflammation, tubular necrosis, and intratubular neutrophil casts. What advanced changes can occur in acute pyelonephritis? - Answer-Abscesses, papillary necrosis, pyonephrosis, and renal scars. What is the prognosis for nephrotoxic Acute Tubular Injury? - Answer-Good (>95% survival) in most cases. What is the prognosis for ATI secondary to overwhelming sepsis? - Answer-Poor (>50% mortality). What is a common clinical feature of uncomplicated pyelonephritis? - Answer-It follows a benign course with antibiotic therapy. What is uncomplicated pyelonephritis? - Answer-A benign condition that follows antibiotic therapy but can recur or progress due to various factors.
What is hepatorenal syndrome? - Answer-Impairment of renal function in patients with liver failure, associated with tubular bile cast formation. What is nephrosclerosis? - Answer-Kidney pathology associated with renal arteriolar sclerosis, causing ischemic atrophy of nephrons. What factors contribute to the severity of nephrosclerosis? - Answer-Age, race, hypertension, diabetes, and comorbid diseases. What characterizes malignant nephrosclerosis? - Answer-Accelerated hypertension often superimposed on preexisting benign hypertension. What are the consequences of endothelial injury in malignant nephrosclerosis? - Answer-It leads to fibrinoid necrosis and intravascular thrombosis. What is the role of cytokines in nephropathy associated with NSAIDs? - Answer-They can lead to podocyte foot process effacement and other renal changes. What is the prognosis associated with proteinuria and FSGS in chronic pyelonephritis? - Answer-The development of proteinuria and FSGS is a poor prognostic sign. What is the typical onset of symptoms in chronic pyelonephritis? - Answer-Symptoms can be silent and insidious, presenting late with hypertension or renal dysfunction. What is the impact of nephrocalcinosis on kidney function? - Answer-It can cause renal insufficiency through tubular obstruction and direct epithelial effects. What is the relationship between hypertension and renal vascular changes? - Answer- Renal vascular changes tend to amplify hypertension. What causes renal ischemia? - Answer-Stimulation of the renin-angiotensin and other vasoconstrictive systems, leading to aldosterone-driven salt and water retention. What are the pathologic changes associated with severe hypertension? - Answer- Fibrinoid necrosis of arterioles, hyperplastic arteriopathy (onion-skinning), necrotic glomeruli, and glomerular thrombotic microangiopathy. What systolic and diastolic blood pressures indicate severe hypertension? - Answer- Systolic pressures >200 mm Hg and diastolic blood pressures >120 mm Hg. What clinical features are associated with severe hypertension? - Answer-Proteinuria, hematuria, papilledema, encephalopathy, cardiovascular abnormalities, and renal failure.
What percentage of patients survive 5 years with prompt antihypertensive intervention?
- Answer-75% of patients. What is the most common cause of unilateral renal artery stenosis? - Answer- Obstructive atheromatous plaque at the renal artery take-off. What is a significant characteristic of fibromuscular dysplasia? - Answer-It usually occurs in young women (ages 20 to 40) and involves nonarteriosclerotic intimal, medial, or adventitial hyperplasia. What are thrombotic microangiopathies characterized by? - Answer-Microangiopathic hemolytic anemia, thrombocytopenia, renal failure, and manifestations of intravascular coagulation. What is the primary cause of Hemolytic Uremic Syndrome (HUS)? - Answer- Endothelial injury, often associated with bacterial toxins. What is Thrombotic Thrombocytopenic Purpura (TTP) caused by? - Answer-Inherited or acquired deficiencies of ADAMTS13, a plasma metalloproteinase. What morphological changes are seen in thrombotic microangiopathies? - Answer- Thromboses in interlobular arteries, afferent arterioles, and glomeruli, along with necrosis and thickening of vessel walls. What is Atheroembolic Renal Disease? - Answer-A condition where cholesterol crystals and debris embolize from atheromatous plaques, causing arterial narrowing and ischemic injury. What complications can arise from Sickle Cell Nephropathy? - Answer-Vascular occlusion leading to hematuria, diminished concentrating ability, and proteinuria. What is Diffuse Cortical Necrosis associated with? - Answer-Obstetric emergencies, septic shock, or extensive surgery, leading to renal necrosis. What are common sources of renal infarcts? - Answer-Left atrial or ventricle mural thrombi, left-sided valvular vegetations, aortic aneurysms, and aortic atherosclerosis. What percentage of newborns have significant malformations of the urinary system? - Answer-Approximately 10%. What is the consequence of bilateral agenesis of the kidney? - Answer-It is incompatible with life.
What associated liver condition is common in ARPKD? - Answer-Congenital hepatic fibrosis. What is Medullary Sponge Kidney? - Answer-A condition presenting with multiple cystic dilations in the medullary collecting ducts. What are the four variants of nephronophthisis? - Answer-Sporadic nonfamilial, familial juvenile nephronophthisis, renal-retinal dysplasia, and adult-onset medullary cystic disease. What is the primary genetic cause of juvenile nephronophthisis? - Answer-Mutations in the NPH1, NPH2, and NPH3 gene loci. What is Multicystic Renal Dysplasia? - Answer-A sporadic disorder characterized by enlarged, multicystic kidneys with abnormal lobar organization. What is the consequence of prolonged renal dialysis on kidneys? - Answer- Development of multiple cortical and medullary cysts, with a risk of renal cell carcinoma. What are simple renal cysts? - Answer-Commonly encountered, single or multiple cysts lined by low cuboidal epithelium, filled with clear serous fluid. What is hydronephrosis? - Answer-Dilation of the pelvis and calyces associated with progressive renal atrophy due to obstruction. What are common causes of urinary tract obstruction? - Answer-Congenital anomalies, urinary calculi, benign prostatic hypertrophy, tumors, inflammation, and functional disorders. What are the clinical features of unilateral renal obstruction? - Answer-Often silent for long periods due to compensation by the unaffected kidney. What is the lifetime risk of urolithiasis in the United States? - Answer-5% to 10%, with a peak incidence between ages 20 and 30. What are the four types of renal calculi? - Answer-Calcium-containing stones, struvite stones, uric acid stones, and cystine stones. What is the most common type of renal calculi? - Answer-Calcium-containing stones, comprising approximately 70% of cases. What causes struvite stones? - Answer-Bacterial infections that convert urea to ammonia, leading to precipitation in alkaline urine.
What is the primary cause of uric acid stones? - Answer-Acidic urine (pH < 5.5) that causes uric acid to precipitate. What are the clinical symptoms of renal stones? - Answer-Obstruction, ulceration, bleeding, and pain (renal colic). What can happen if urinary obstruction is not relieved? - Answer-It can lead to permanent renal atrophy. What is the role of inhibitors of crystal formation in kidney stone prevention? - Answer- Loss of inhibitors like citrate and pyrophosphate can contribute to stone formation. What is the significance of renal colic? - Answer-It is a common symptom associated with renal obstruction due to stones. What is the relationship between hypertension and renal cystic diseases? - Answer- Progression of renal cystic diseases is accentuated in the presence of hypertension. What percentage of patients with PKD2 mutations experience renal failure by age 70? - Answer-45%.
