Renal System

Urine Formation: Production of urine as a waste product of metabolism.
Excretion of Waste Products: Removal of toxins and waste generated from metabolic processes.
Regulation of Electrolytes: Maintaining balance of minerals like sodium, potassium, and calcium.
Regulation of Acid-Base Balance: Stabilization of blood pH.
Control of Water Balance: Adjusting the body's hydration status.
Renal Clearance: Removal of substances from blood plasma.
Regulation of Red Blood Cell Production: Stimulated by erythropoietin.
Synthesis of Vitamin D: Activation of vitamin D for calcium metabolism.
Secretion of Prostaglandins: Important for regulating blood flow.
Regulation of Calcium and Phosphorus Balance: Essential for bone health and metabolic processes.

NOPQRST Format:
- N - Nature of symptoms
- O - Onset of symptoms
- P - Provocation or relief
- Q - Quality of symptoms
- R - Region and radiation
- S - Severity
- T - Time course
Focus on factors such as frequency, urgency, hesitancy, and burning during urination.

Nephrons: Functional units of the kidney.
CO to Kidneys: Kidneys receive 20-25% of cardiac output.
Blood Circulation: Entire blood volume circulates through the kidneys about 14 times per minute.
Filtration Process: Plasma is filtered in the glomerulus at a Glomerular Filtration Rate (GFR) of approximately 125 mL/min/1.73 m².
Urine Formation: Tubules modify the filtered plasma to form urine.
Common Symptoms: Dysuria (painful urination), hematuria (blood in urine), incontinence.

HEENT: Check for periorbital edema impacting eyes.
Cardiovascular: Look for hypertension (HTN), heart failure (HF), and vascular disease.
Respiratory: Conditions like Goodpasture’s syndrome.
Gastrointestinal: Conditions such as hepatitis and cirrhosis.
Musculoskeletal: Assess for muscle weakness.
Neurological: Monitor for numbness, tingling, burning sensations, tremors, or memory loss.
Endocrine: Evaluate for diabetes mellitus.
Hematological: Check for sickle-cell anemia.
Immune: Look for systemic lupus erythematosus.
Integumentary: Notice dryness and itching.

GFR Decline: GFR begins to decrease between ages 35-40, with an annual decrease of about 1 mL/min.
Kidneys' Susceptibility: Structural and functional changes in kidneys increase risk for acute kidney injury (AKI) and chronic kidney disease (CKD).
Renal Functioning: Often remains adequate, but renal reserve diminishes, affecting response to drastic physiological changes.
Medication Risks: Elderly patients on multiple medications are at increased risk for adverse effects and drug interactions.
Creatinine Levels: A minimal increase in serum creatinine may indicate significant renal impairment in the elderly due to decreased muscle mass.
Post-Renal AKI Risks: Older men with prostatic enlargement are more susceptible to post-renal AKI.

Creatinine, Serum:
- Males: 70-120 µmol/L (0.8-1.4 mg/dL)
- Females: 50-90 µmol/L (0.56-1.0 mg/dL)
BUN: 2.5 - 8.0 mmol/L (7.0-22.4 mg/dL)
Creatinine Clearance (Adult): 75-125 mL/min.
Hemoglobin:
- Males: 123 – 157 g/L (12.3 – 15.7 g/dL)
- Females: 140-174 g/L (14.0-17.4 g/dL)
Hematocrit:
- Males: 0.370-0.460 (37-46%)
- Females: 0.420-0.520 (42-52%)

Incident: LO fell at home, resulting in a hip injury; exhibited contraindications due to anticoagulant use.
Hospitalization: On admission, LO was hypotensive and tachycardic, indicative of blood loss.
Urinary Evaluation: Notable low urine output postoperation (only 60 mL in 4 hours).
Nursing Actions: Assess minimum urine output requirements and determine next steps to manage renal function effectively.

Obtain a comprehensive medical history including medication usage.
Use KDIGO criteria to classify AKI into stages based on urine output and serum creatinine levels.
Assess risk factors including sepsis, blood loss, and nephrotoxic drug use.
Monitor vital signs and neurological status.
Implement regular and intensive monitoring for patients at high risk.

Prerenal AKI: Related to reduced blood flow to kidneys, e.g., dehydration.
Intrarenal AKI: Associated with direct damage to the kidney tissues, e.g., acute tubular necrosis.
Postrenal AKI: Situations leading to obstruction in the urinary tract, e.g., kidney stones.

Prevention: Recognizing high-risk patients and acting promptly.
Monitoring: Keeping track of intake and output alongside fluid and electrolyte balance.
Acute Management: Aseptic techniques, infection prevention, and possible dialysis.

Early Stage: Mild symptoms, potential for unrecognized impact on quality of life (QOL).
Middle Stages: Obvious symptoms arise leading to significant lifestyle changes and emotional impacts.
Advanced Stages: Major symptoms, requiring interventions such as dialysis.

Psychological impacts: fatigue, anxiety, and depression.
Physical effects: sleep disturbances and pruritus.
Life adjustments: financial concerns and changes in lifestyle and travel capabilities.