Renal System

Overview of Body Systems in Nursing

• **Importance of understanding major organs** in each body system to facilitate **NCLEX preparation**.

• Every disease **impacts processes related to organs**, **understanding function is crucial**.

• Example: Discuss diseases affecting kidney function and their implications.

Acute Kidney Injury (AKI)

Definition

• **AKI** is characterized as *a rapid decline in kidney function*.

• Differentiated from **chronic kidney disease (CKD)** by the **speed of onset**.

Causes of AKI

• **Volume Depletion (Hypoperfusion):**

  • Causes include **dehydration**.

  • **Signs of hypoperfusion** can be monitored through **blood pressure levels**.

• **Nephrotoxins:**

  • Common nephrotoxins include **NSAIDs** (e.g., ibuprofen, naproxen).

• **IV Contrast:**

  • Used in imaging studies like **CAT scans**.

  • **Risk of AKI** necessitates **kidney function assessments** prior to administration.

• **Obstruction:**

  • **Decrease in urine output** or **flank pain** indicating potential obstructions (e.g., bladder, urethral).

Signs and Symptoms

• **Urine Output:**

  • **Urine output < 0.5 mL/kg/hour is critical**.

  • **Anuria** may indicate either kidney or bladder obstruction.

• **Edema:**

  • **Pitting edema** indicates **fluid retention**.

  • Graded by indentation: *+1 (2 mm)*, *+2 (4 mm)*, *+3 (6 mm)*, *+4 (8 mm)*.

• **Lab Findings:**

  • **Elevated BUN (blood urea nitrogen)** and **creatinine levels** indicate compromised kidney function.

  • **GFR (glomerular filtration rate)** typically **does not immediately rise with AKI**.

  • **Elevated potassium (hyperkalemia)** and its **EKG implications (peaked T waves)**.

Management Strategies

• **Addressing AKI:**

  • **Hypoperfusion:**

  • Administer **IV fluids** or **vasopressors** to increase **blood pressure** and **improve perfusion**.

  • **Dialysis:**

  • Needed in **severe cases to remove toxins while kidneys recover**.

  • **Electrolyte Management:**

  • **Insulin** and **dietary potassium restrictions** to manage **hyperkalemia**.

Chronic Kidney Disease (CKD)

Definition

• **CKD** characterized by *gradual, progressive loss of kidney function over time*.

• Often results in **end-stage renal disease (ESRD)**.

Key Laboratory Indicators

• **GFR:**

  • **Normal GFR > 90 mL/min**; < 15 mL/min indicates **ESRD**.

• **BUN and Creatinine:**

  • **Elevated levels** are consistent with **declining kidney function**.

Risk Factors for CKD

• **Diabetes:**

  • **High blood sugar** leads to **vascular damage** affecting renal blood flow.

• **Hypertension:**

  • **Increased blood pressure** can **damage delicate renal structures** over time.

Assessment Findings

• Symptoms of **anemia** (fatigue, pallor) due to **inadequate erythropoietin production**.

• **Bone disease** and **metabolic bone disorders** due to **disrupted calcium and vitamin D metabolism**.

• **Uremic frost** and **symptoms of systemic fluid overload** (e.g. pulmonary edema).

Management Strategies

• **Education on dietary restriction** (e.g., low sodium, low potassium).

• Potential use of medications like **ACE inhibitors** for **blood pressure control**.

• **Erythropoietin-stimulating agents** for **anemia management**.

• **Dialysis** and **renal replacement therapy** in **ESRD**.

Important Points on Dialysis

Hemodialysis

• Procedure involves *filtering blood through a machine*, usually performed **3x/week**.

• **Monitoring vascular access (fistula) is vital**; assess for **thrill and bruit**.

• Know **risks of anticoagulation** during hemodialysis.

Continuous Renal Replacement Therapy (CRRT)

• *Continuous process suited for critically ill patients*; **gentler than hemodialysis**.

• **Concentrated on preventing rapid fluid shifts**.

Peritoneal Dialysis

• Technique involves *fluid infusion into the peritoneal cavity for filtration*.

• Risks include **infection** and **gastrointestinal symptoms**.

Pharmacology in AKI and CKD

Common Medications

• **Diuretics (e.g. Lasix):**

  • Used cautiously; can **exacerbate electrolyte imbalances**.

• **Insulin:**

  • Manages **severe hyperkalemia by shifting potassium into cells**.

• **Antibiotics:**

  • Required management for infections, especially in **CKD patients**.

Monitoring Requirements

• Monitor **vital signs** during and post-dialysis sessions.

• Check **electrolyte levels closely**, especially **potassium and calcium**.

• Track **urine output** to inform **fluid management**.

Ethical Considerations

• Understand the **moral implications of prescribing treatments**, especially regarding **harsh interventions like dialysis** for patients with **limited prognosis**.

Conclusion

• **Knowledge of kidney functions and diseases is crucial** for **nursing care** and **NCLEX preparation**.

• **Understanding disease processes, lab results, and pharmacology** aids in **effective patient management**, particularly in cases of **acute and chronic kidney conditions**.