RENAL Diseases

• Investigation of renal system

• Haematuria/ PSGN• ARF/CRF• Proteinuria/ Nephrotic

syndrome• UTI• Congenital Anomalies

HEMATURIA

• Hematuria is one of the most common urinary findings that bring children to the attention of the

pediatric nephrologist.

• Generally, hematuria is defined as the presence of 5 or more red blood cells (RBCs) per high-power field in fresh centrifuged speciment.

• Hematuria:

can be gross “Macroscopic”

(ie, the urine is overtly bloody, smoky, or tea colored) or microscopic.

It may be symptomatic or asymptomatic, transient or persistent, and either isolated or associated with proteinuria and other urinary abnormalities.

• The role of the primary care physician in the management of a child with hematuria includes the following:

• Recognize and confirm the finding of hematuria. • Identify common etiologies. • Select patients who have significant urinary

system disease that might require further expertise in either diagnosis or management and referral.

Causes of RED urine

• 1- Heme-negative (no RBC or Hb).

• 2- Heme-positive ( Hb + no RBC).

• 3- True Hematuria ( RBC +- Hb).

Causes of Heme-positive ( no RBC but positive Hb)

• 1- Hemoglobinuria. ( As in Hemolytic Anemia)• 2- Myoglobinuria: (Resulting from muscle injury or secondary to viral

infection, cruch injury, or DIC)

Causes of Heme-negative (no RBC or Hb).

• 1- Drugs• 2- Dyes• 3- Metabolites.

Red urine without RBCs

Causes of True Hematuria:

• 1- Glomerular hematuria :

• Thin basement membrane disease (benign familial hematuria)

• Alport syndrome • IgA nephropathy • Hemolytic uremic syndrome • Postinfectious glomerulonephritis • Membranoproliferative glomerulonephritis • Lupus nephritis • Anaphylactoid purpura (Henoch-Schönlein purpura).

• 2- Nonglomerular hematuria: • Fever • Strenuous exercise • Mechanical trauma (masturbation) • Menstruation • Foreign bodies • Urinary tract infection • Hypercalciuria/urolithiasis • Sickle cell disease/trait • Coagulopathy • Tumors • Drugs/toxins (NSAIDs, anticoagulants, cyclophosphamide, ritonavir, indinavir) • Anatomic abnormalities (hydronephrosis, polycystic kidney disease, vascular

malformations) • Hyperuricosuria

APPROACH TO HEMATURIA.

HISTORY: clots in urine ? Extraglomerular causes fever, abdominal pain, dysuria, frequency, and recent enuresis in older

children (? UTI). recent trauma to the abdomen ?Hydronephrosis early-morning periorbital puffiness, weight gain, oliguria, the presence of

dark-colored urine, and the presence of edema or hypertension (?Glomerular causes)

Is painless (? Glomerular causes) Recent throat or skin infection (? Postinfection glomerulonephritis). Joint pains, skin rashes, and prolonged fever in adolescents (? Coollagen

Vascular Disorders). Skin rashes and arthritis (? Henoch Schonelein Purpura or SLE). exercise, menstruation, recent bladder catheterization, intake of certain

drugs or toxic substances, or passage of a calculus Family history (? Inherited or Familial Renal diseases).

• Investigation:– Studies performed in all patients:

• urine microscopy and culture• CBC• serum creatinine• serum C3 level• US kidneys• urine protein = urine albumin/creatinine ratio• calcium = urine calcium/creatinine ratio

– Studies performed in selected patients: • Dnase B titer or streptozyme < 6 months duration• Skin or throat culture• ANA titer• Urine analysis looking for cast• Coagulation study/ platelet count• Sickle cell screen • Audiogram

– Renal biopsy• Microscopic haematuria plus any of the following:

– Diminished renal function– Proteinuria

• Persistant microscopic haematuria (>1 year)• Second episode of gross haematuria

– Cystoscopy• Pink o microscopic haematuria, dysuria and sterile urine culture

Glomerular: brownish or cola-coloured and may contain RBCs cast, proteinuria

Lower urinary tract: red to pink color urine and may contain clots

• 7 years old boy

• Frank haematuria (smokey or tea colored)

• H/O throat infection 2 weeks ago

• O/E peri-orbital edema, BP 140/90 (hypertension)– What is the most likely diagnosis– What investigations

Post-streptococcal glomerulonephritis:

• Rare before the age of 3 years

• Nephritic picture: Gross haematuria, edema , hypertension, renal insufficiency (normal RF-ARF)

• Complications of hypertension: encephalopathy, congestive heart failure

• Rarely: nephritic- nephrotic picture.

Diagnosis:

• Urine analysis: RBCs, RBCs cast, proteinuria

• Low complement C3

• Evidence of streptococcal infection: throat culture, ASO titer and DNase B antigen and streptozyme test

• Mild normochromic anaemia

• Renal function

Complications:

ARF volume overload, hypertension, fits, hyperkalemia, hyperphosphatemia, hypocalcaemia and acidosis

Treatment• Antibiotics

• Management of ARF

• Treat Hypertension.

Prognosis

• Complete recovery 95%

• Infrequently: severe acute phase leading to chronic renal insufficiency

• Recurrence are extremely rare.

Case History:

• 5 years old boy

• Generalized malaise, abdominal pain, joints pain, peri orbital oedoma, skin rash (as seen in the picture).

• He presented with Hematuria.

• What is the most likely diagnosis?

Henoch-Schönlein Purpura or (Anaphylactoid Purpura)

• Renal involvement occurs in 25–50% of children during the acute phase

• Haematuria with or without casts or proteinuria during the first few weeks of illness

• The nephrotic syndrome, moderate azotemia, hypertension, oliguria, and hypertensive encephalopathy may occasionally occur.

• Most children with renal involvement recover

Recurrent Gross Haematuria or Persistent Microscopic Haematuria

• IgA nephropathy (Berger)

• Alport syndrome

• Familial idiopathic haematuria

• Idiopathic hypercalciuria.

IgA Nephropathy (Berger)

• Glomerulonephritis with IgA as the predominant immunoglobulin in mesangial deposits, in the absence of any systemic disease

• Haematuria + minimal proteinuria

• Normal C3 + usually normal RF

• Diagnosis: renal biopsy

IgA Nephropathy (Berger)

• Treatment: supportive

• Prognosis: mainly good, only 30% has progressive disease:hypertension, diminished renal function, or proteinuria exceeding 1 g/24 hr between episodes of gross hematuria

ALPORT Syndrome.

• Hereditary nephritis. (85%X-linked, AR&AD).• Haematuria + proteinuria + sensorineural hearing loss

(minority) + eye abnormalitie (10%) Corneal erosione.• Diagnosis: renal biopsy.• Males with Alport syndrome commonly develop end-

stage renal failure in the 2nd or 3rd decade of life, occasionally in association with hearing loss. Females usually have a normal life span and only subclinical hearing loss.

Idiopathic Familial Benign Haematuria

• No proteinuria

• All investigations normal

• Urine test of the parents and siblings

• An excellent prognosis, but long-term follow-up is required to exclude Alport syndrome

Idiopathic Hypercalciuria

• This entity may be inherited as AD,and may present with recurrent gross hematuria or persistent microscopic hematuria, or dysuria in the absence of stone formation, or sandy urine.

• Hypercalciuria (without hypercalcemia)• Diagnosis: 24-hr urinary calcium excretion

exceeding 4 mg/kg, urine calcium to creatinine ratio (mg/mg)>0.2

• Hypercalciuria may lead to nephrolithiasis• RX: Oral thiazide & decrease Ca intake.

Membranous Glomerulopathy

• Uncommon in childhood and a rare cause of haematuria.

• The most common cause of nephrotic syndrome in adults.

• Associated with systemic lupus erythematosus, cancer, gold or penicillamine therapy, and syphilis and hepatitis B virus infections.

• Diagnosis: Renal biopsy.

MEMBRANOPROLIFERATIVE (MESANGIOCAPILLARY) GLOMERULONEPHRITIS

• Chronic glomerulonephritis that frequently leads to glomerular destruction and end-stage renal failure.

• Most common in the second decade of life.• Presentation: nephrotic syndrome, gross

hematuria or asymptomatic microscopic hematuria, proteinuria and hypertension . renal function may be normal to depressed. Low C3 complement level.

• Diagnosis by renal biopsy.

RAPIDLY PROGRESSIVE (CRESCENTIC) GLOMERULONEPHRITIS

• Nephritis with rapid progression to end-stage renal failure

• Causes: poststreptococcal, lupus, membranoproliferative, the glomerulonephritides of Goodpasture disease, anaphylactoid purpura, and other forms of vasculitis

• Acute renal failure, often after an acute nephritic or nephrotic episode

• Diagnosis: Renal biopsy• Paediatric Nephrology Emergency

Acute Renal Failure

• Develops when renal function is diminished to the point at which body fluid homeostasis can no longer be maintained.

• Oliguria (daily urine volume less than 400 ml/m2) is common, the urine volume may approximate normal.

• Nonoliguric renal failure: in certain types of acute renal failure (aminoglycoside nephrotoxicity).

Etiology

• Prerenal causes– Hypovolemia, hypotension, hypoxia (dehydration,Hemorrhage,Sepsis,H.F)

• Renal causes– Acute tubular necrosis– Acute interstitial nephritis– Glomerulonephritis– Localized intravascular coagulation– Tumors – Developmental abnormalities– Hereditary nephritis

• Postrenal causes– Obstructive uropathy, stone, blood clot.

CLINICAL MANIFESTATIONS OF ACUTE RENAL FAILURE

• Diminished urine output• Oedema (salt and water overload)• Hypertension, vomiting, and lethargy (uremic

encephalopathy). • Complications of acute renal failure: volume

overload with congestive heart failure and pulmonary edema, arrhythmias, gastrointestinal bleeding due to stress ulcers or gastritis, seizures, coma, and behavioral change

Life threatening: GIT bleed, pericarditis and encephalopathy

Diagnosis

• Careful history

• Examination

• Investigation: CBC, urea and electrolytes, PO4, Ca, blood gases, C3, US kidneys, urine electrolytes ( Na and creatinine), fractional excretion of Na (less than 1% in hypovalaemia) (FENa= (UNa x PCr/PNaxUCr) X100).

Urine Analysis

Prerenal.• Urine osmolality exceeds 500

mOsm/kg [mmol/l] H2O.• Sodium content is usually

less than 20 mEq/l (mmol/l).• The fractional excretion of

sodium (urine Na x plasma Cr divided by the plasma Na x urine creatinine concentration X 100) is usually less than 1%.

Renal• osmolality less than

350 mOsm/kg [mmol/l] H2O

• Usually exceeds 40 mEq/l (mmol/l)

• Usually exceeds 1%

Treatment

• Pre-renal=Hypovolemia: volume replacement may be critical

• Renal:– Fluid restriction: input= output + 400 ml/m2/24 hr

(insensible losses)– Hyperkalemia: no potassium-containing fluid, foods,

or medications until adequate renal function is re-established

• > 7 mEq/L (mmol/L): Nebulised salbutamul, IV Calcium gluconate, sodium bicarbonate, ca resonium, glucose and insulin

– Moderate acidosis is common in renal failure: Na bicarbonate

Treatment

• Hypocalcemia and hyperphosphataemia: Ca binders (Ca carbonate).

• Hypertension:– The primary disease process (nifedipine, diazoxide, sodium

nitroprusside or labetalol as a continuous intravenous infusion is indicated for hypertensive crises).

– Expansion of the extracellular fluid volume (salt and water restriction is critical).

• Indications for dialysis: fluid overload, and congestive heart failure, electrolyte abnormalities (especially hyperkalemia), central nervous system disturbances, hypertension.

Prognosis

• In general, recovery of function is likely following renal failure resulting from prerenal causes, the hemolytic-uremic syndrome, acute tubular necrosis, acute interstitial nephritis, or uric acid nephropathy.

• On the other hand, recovery of renal function is unusual when renal failure results from most types of rapidly progressive glomerulonephritis, bilateral renal vein thrombosis, or bilateral cortical necrosis.