Study Notes on Hyperkalemia, Detoxification, Kidney and Liver Function

Causes of Hyperkalemia:
  - Renal disease
  - Potassium (K) sparing diuretics such as ACE inhibitors / ARBs
  - Renin-Angiotensin-Aldosterone System (RAAS) suppressants
  - Fluid Volume Excess (FVE) leading to decreased urine output
  - Hypertension (HTN)
  - Associated with renal failure, heart failure (HF), high sodium diet, atherosclerosis, pre-eclampsia, hypotonic solutions, and intravenous fluids
  - Other contributing factors include liver failure, SIADH, Cushing's syndrome (especially pregnancy), HF, long-term steroid use
  - Effects of Hyperkalemia:
    - Hypertension
    - Fluid Volume Excess (FVE)
    - HTN leads to Type 2 Diabetes Mellitus (T2DM) and chronic renal disease (CRE)
    - Further complications such as edema, pulmonary embolism (PE), electrolyte disturbances, and potential heart failure

Peritoneal Dialysis:
  - Pros:
    - Suitable for cognitively impaired patients
    - Can be performed at home without liquid/food restrictions
    - Self-manageable; can be done while sleeping
  - Cons:
    - Requires daily procedures
    - Risk of infection and may be challenging for individuals who cannot manage their healthcare
Hemodialysis:
  - Pros:
    - Typically done in a clinical setting under professional supervision
  - Cons:
    - Time-consuming, requires travel
    - Risk of volume swings and has dietary fluid restrictions
    - Risk of infection and potential rejection of kidney transplant
Kidney Transplant:
  - Advantages include restored kidney function and elimination of the need for dialysis
  - Challenges:
    - Long wait for donors, may take years
    - Patients need to be on immunosuppressants, increasing infection risk
    - Time-consuming recovery process

Definition:
  - The removal of toxic substances from the human organism to promote homeostasis
  - Attributes:
    - Hepatic involvement primarily
    - Renal involvement plays a role also

Impaired detoxification leads to waste accumulation, impacting both renal and hepatic functions.
Normal Renal Functions Include:
  - Regulating fluid volume
  - Maintaning acid-base balance and electrolyte levels
  - Removal of wastes and urine production
Effects of Chronic Kidney Disease:
  - Sodium and water balance issues
  - Potassium balance disturbances leading to hyperkalemia
  - Inability to eliminate nitrogenous wastes
  - Anemia due to decreased erythropoietin production
  - Acid-base balance impairment leading to metabolic acidosis
  - Hypertension as a consequence of fluid overload and increased vascular volume

Normal Hepatic Function Includes:
  - Breakdown of toxins, chemicals, and medications
  - Metabolism of carbohydrates, fats, and proteins
  - Production of clotting factors and storage of vitamins
  - Bile secretion
Disorders of Function:
- Liver failure affecting synthesis and storage functions including glucose, proteins, cholesterol, bile salts, amino acids, steroid hormones, and bilirubin
- Consequences include hypoglycemia, hypoalbuminemia, decreased fat absorption, drug interactions, hyperbilirubinemia, and resultant encephalopathy
Key Terminology:
  - Nitrogenous waste: waste products formed as a result of metabolism.
  - Azotemia: build-up of nitrogenous waste often indicative of liver issues
  - Uremia: build-up of all systemic wastes

Detox Flow:
  - Liver Processes:
    - Ammonia converted to urea
    - Detoxification of drugs and bilirubin for elimination
  - Kidneys Function in Detoxification:
    - Filter blood, excrete waste as urine
Consequences of Impairment:
- When liver fails, ammonia and bilirubin levels rise, causing confusion and jaundice respectively
- When kidneys fail, nitrogenous wastes accumulate causing urea and creatinine elevation, leading to potential uremic symptoms

Children may show jaundice due to immature systems and require different medication doses
Older adults experience declining organ function starting around age 40, increasing their risk for medication-related complications

Risk Factors for Kidney and Liver Disease:
  - Chronic diseases such as cirrhosis, hepatitis for liver, chronic kidney disease
  - Heart failure and diabetes as contributing factors
  - Medications causing nephrotoxicity or hepatotoxicity and chronic alcohol use
Assessment of Wastes:
- Elevated ammonia levels can cross the blood-brain barrier, leading to neurological symptoms including confusion and asterixis
- Increased urea and creatinine levels can present uremic symptoms such as nausea, weakness, fatigue, and lead to multisystem effects if untreated

Neurologic Symptoms Include:
- Confusion, lethargy, and potential progression to coma
Cardiovascular Effects:
- Hypertension and edema
- Increased potassium can lead to dangerous dysrhythmias
Respiratory Effects:
- Fluid accumulation in lungs and Kussmaul breathing (indicative of acidosis)
Urinary Manifestations:
- Decreased urine output and proteinuria
Metabolic Changes:
- Elevation in BUN, creatinine, potassium, calcium, phosphate, often leading to acidosis
Gastrointestinal Symptoms:
- Nausea, vomiting, and loss of appetite
Hematologic Issues:
- Anemia and increased bleeding risk due to impaired clotting
Dermatological Symptoms:
- Dry, itchy skin and yellowish hue due to underlying metabolic changes

Neurological Impact:
- Increased ammonia levels lead to confusion and potential encephalopathy
Circulatory System Impact:
- Portal hypertension resulting in ascites and esophageal varices
Hematologic Issues:
- Increased risk of bleeding and bruising due to impaired clotting factors
Skin Changes:
- Jaundice indicating buildup of bilirubin, pruritus, and spider angiomas

Cirrhosis of the Liver:
- Decline in all liver functions, resulting in increased ammonia levels and associated symptoms
Chronic Kidney Disease:
- Decline in all kidney functions, leading to increased levels of urea and creatinine

Common laboratory assessments include:
  - Blood Urea Nitrogen (BUN)
  - Serum creatinine
  - Creatinine clearance via 24-hour urine collection
  - Glomerular filtration rate (GFR)
  - Liver function tests (ALT, AST)
Additional tests may include metabolic panels, complete blood counts, urinalysis, biopsies, and imaging studies

Primary and Secondary Strategies:
- Focus on prevention of chronic conditions and lifestyle changes
- Routine screenings, especially for aging individuals and those on medications
Collaborative Interventions:
- Treatment strategies tailored based on the underlying condition, utilizing a multidisciplinary approach
- Common strategies: nutrition support, invasive procedures, pharmacotherapy

Purpose of Dialysis:
- Remove waste products in end-stage renal disease, balancing electrolytes and acid-base levels
- May also be applied in cases of hepatic encephalopathy to reduce ammonia levels
Types of Dialysis:
- Hemodialysis: uses a machine to filter blood
- Nursing considerations include assessing the fistula for