Other Renal Disorders

Other Renal Disorders

Renal System - Uremic Syndrome

  • Definition: Uremic Syndrome is the accumulation of nitrogenous waste products such as urea in the blood when the body cannot eliminate them, leading to toxicity.

  • Causes: Can occur during Acute Kidney Failure (AKF) or Chronic Kidney Failure (CKF).

  • Clinical Manifestations:

    • Nausea and Vomiting (N/V)

    • Seizures

    • Coma

    • Abnormal bleeding

    • Pericarditis

    • Pleural effusions

    • Ultimately, death can result from untreated uremic syndrome.

Uremic Frost

  • Definition: Uremic Frost refers to the phenomenon where the body sweats out excess urea, leading to the formation of crystals on the skin, causing a stinky odor.

  • Example: "You reek Mick!" (u-re-mic).

Renal System - Uremic Syndrome Assessment

Key Assessment Findings:

  • Oliguria: Decreased urine output.

  • Urinalysis (UA) findings:

    • Presence of Protein, RBC, and casts.

  • Blood Pressure: May be Hypotension or Hypertension.

  • Laboratory results: Elevated urea, uric acid, potassium, and magnesium levels.

  • Alterations of level of consciousness (LOC).

  • Additional symptoms:

    • Stomatitis

    • Nausea/Vomiting

    • Diarrhea/Constipation

Interventions:

  • Monitor Vital Signs (VS)

  • Monitor Electrolytes

  • Intake and Output (I&O) tracking.

  • Dietary Restrictions:

    • Limit protein intake.

    • Limit sodium, nitrogen, potassium, and phosphate.

Renal System - Nephrotic Syndrome

  • Definition: Nephrotic Syndrome is a disorder caused by damage to the microvasculature of the kidneys, which allows large amounts of protein (especially albumin) to leak into the blood and then into the urine.

  • Key Notes: The liver can usually increase albumin production to some extent but cannot keep up with the daily loss via the kidneys.

  • Clinical Features:

    • Proteinuria: >3.5 grams per day.

    • Generalized edema: Occurs everywhere in the body.

    • Hypoalbuminemia: Low serum albumin levels.

    • Elevated Triglycerides and Cholesterol.

    • Hyperlipidemia.

Nephrotic Syndrome - Risk Factors

  • Sex: Affects males more than females.

  • Medical conditions associated:

    • Diabetes Mellitus

    • Systemic Lupus Erythematosus (SLE)

    • Amyloidosis: Accumulation of abnormal amyloid proteins causing organ damage due to clumping in tissues.

    • Minimal Change Disease (MCD): Causes nephrotic syndrome in children, commonly occurs at ages 2-3 years, idiopathic in nature.

Amyloidosis Characteristics

  • Classic facial features include purpura around the eyes caused by amyloid deposits.

Nephrotic Syndrome - Classifications

  • Primary Nephrotic Syndrome: Limited to the kidneys.

  • Secondary Nephrotic Syndrome: Affects kidneys and also other parts of the body.

  • Diagnosis: Based upon biopsy histology.

Primary Nephrotic Syndrome - Causes

  • Minimal Change Disease (MCD): Most common cause in children where large amounts of protein are lost in the urine.

  • Focal Segmental Glomerulosclerosis (FSGS): Partial scarring of the glomeruli which may appear at any age, a significant cause of nephrotic syndrome across the lifespan.

  • Membranous Nephropathy (MN): The cause is mostly unknown but may be due to drugs, infections, autoimmune responses, or cancers.

Secondary Nephrotic Syndrome - Causes

  • Membranous Nephropathy related to:

    • Hepatitis B

    • Sjogren's Syndrome

    • SLE

    • Diabetes Mellitus

    • Sarcoidosis

    • Syphilis

  • Drugs: Can induce nephropathy.

  • Focal Segmental Glomerulosclerosis related to obesity, diabetes mellitus, and malignancy.

Nephrotic Syndrome - Signs and Symptoms

  • Clinical Signs include:

    • Excess body fluid

    • Puffiness around the eyes

    • Pitting edema of legs and lower extremities

    • Pleural effusion and ascites

    • Hypertension (HTN)

    • Foamy urine due to severe proteinuria

    • Rash associated with SLE.

Nephrotic Syndrome - Complications

  • Possible complications include:

    • Thromboembolism, especially in the renal vein

    • Accelerated atherosclerosis

    • Infection risks

    • Acute Kidney Injury (AKI) related to hypovolemia

    • Pulmonary edema

    • Growth retardation in children

    • Vitamin D deficiency

    • Microcytic hypochromic anemia that is resistant to iron treatment.

Nephrotic Syndrome - Treatment

Medications:

  • Use of:

    • ACE inhibitors

    • Angiotensin II receptor blockers to induce vasodilation

    • Diuretics such as Lasix and spironolactone

    • Statins for lipid management

    • Blood thinners to prevent clotting

    • Immunosuppressants

    • Antibiotics for infections.

Supportive Treatment:

  • Monitor Intake & Output (I&O)

  • Fluid restriction to 1 L/day

  • Dietary modifications:

    • Sodium restriction to 1000-2000 mg/day

    • Moderate protein diet

    • Avoidance of saturated fats

    • Medication adherence.

  • Kidney function monitoring via GFR assessments.

Primary Glomerular Disease

  • Definition: Glomerular injury characterized by destruction of the glomerulus and inflammation of the glomerular capillaries.

  • Mechanism: Antigen-antibody complexes in the blood become trapped in the glomerular capillaries, inducing an inflammatory response.

  • Primary immunoglobulin involved: IgG, detected in glomerular capillary walls.

Manifestations of Glomerular Injury

  • Common findings include:

    • Proteinuria

    • Hematuria

    • Decreased Glomerular Filtration Rate (GFR)

    • Decreased sodium excretion

    • Edema

    • Hypertension.

Acute Nephritic Syndrome

  • Definition: Renal failure associated with glomerular inflammation, known as Glomerulonephritis, which can be acute or chronic.

  • Possible Causes:

    • Post-infectious cases, specifically after Group A beta-hemolytic streptococcal throat infections occurring 2-3 weeks prior.

    • Follow-up infections such as impetigo.

    • Acute viral infections (e.g., mumps, varicella zoster, HIV, EBV).

    • Medication or environmental antigen exposure leading to antigen-antibody complex deposition in the glomeruli.

    • Autoimmune conditions.

Clinical Manifestations of Acute Nephritic Syndrome

  • Elevated BUN and creatinine with decreasing urine output.

  • Severe manifestations may include:

    • Headache (H/A)

    • Malaise

    • Flank pain

  • Severe cases in older patients can cause:

    • Fluid overload (FVO)

    • Shortness of breath (SOB)

    • Pulmonary edema

    • Cardiomegaly

    • Confusion or even seizures.

Assessment & Diagnosis

  • Findings: Edematous and congested kidneys upon examination.

  • Biopsy may be required for definitive diagnosis.

  • Improvement noted by:

    • Increased urine output

    • Decreased BUN/Cr levels

    • Decreased proteinuria.

Complications of Acute Nephritic Syndrome

  • Complications might include:

    • Hypertensive encephalopathy

    • Heart failure and pulmonary edema.

  • Management focuses on:

    • Supporting affected systems and correcting hypertension.

    • A rapidly progressing glomerulonephritis can lead to End-Stage Kidney Disease (ESKD).

  • Characteristic findings may include:

    • Crescent shaped cells entering Bowman's space, disrupting filter function.

  • Treatment options:

    • Plasmapheresis

    • High-dose corticosteroids

    • Cytotoxic agents to reduce inflammation.

    • Dialysis required in severe cases.

  • Prognosis: Overall, the prognosis for acute nephritic syndrome is excellent if treated promptly.

Management Strategies

  • Focus on treating symptoms, supporting systems, and preserving kidney function.

  • Key strategies include:

    • Control of hypertension and proteinuria.

    • Procaine penicillin (PCN) is the drug of choice for infectious routes.

    • Dietary protein restriction until BUN/Cr levels improve.

    • Sodium restriction indicated in cases of edema, hypertension, and heart failure.

Chronic Glomerulonephritis

  • Definition: Chronic glomerulonephritis may result from recurring acute nephritic syndrome episodes, hypertensive nephrosclerosis, hyperlipidemia, SLE, Goodpasture's syndrome, diabetic glomerulosclerosis, amyloidosis, or other conditions.

  • Characteristics: Kidneys shrink in size to 1/5 of their normal size, primarily consisting of fibrous tissue, with renal artery thickening.

Manifestations of Chronic Glomerulonephritis

  • Patients may be asymptomatic for years, with symptoms typically found when treated for hypertension or elevated BUN/Cr.

  • Common symptoms include:

    • Weight loss

    • Nocturia

    • Irritability or dizziness.

  • Progressively developing signs of Chronic Kidney Disease (CKD):

    • Periorbital and peripheral edema.

    • Yellowish-gray tint to the skin.

    • Changes in the eyes due to small vessel damage.

    • Anemia

    • Distended neck veins and cardiomegaly.

    • Peripheral neuropathy and neurological changes appear in late stages.

    • Pulsus paradoxus: Notable changes in blood pressure with inspiration vs. expiration (>10 mm Hg).

Diagnostic Findings in Chronic Glomerulonephritis

  • Common lab findings:

    • Proteinuria

    • Urinary casts secreted by damaged tubules.

    • Decreased GFR

    • Hyperkalemia

    • Metabolic acidosis

  • Other findings include:

    • Anemia

    • Hypoalbuminemia

    • Decreased serum calcium due to binding with phosphorus (elevated levels of phosphorus).

    • Evidence of cardiac enlargement.

Management of Chronic Glomerulonephritis

  • Focus on supporting systems and reversing damage when possible:

    • Monitor I&O, weights.

    • Dialysis may be needed in some cases.

    • Diuretics and antihypertensives may be utilized.

    • Implementing a high protein diet for healing.

    • Continuous evaluation of electrolytes and labs.

    • Patient education on follow-ups and management strategies.