Diuretic Agents and Related Medications

Chapter 51 – Diuretic Agents

1. Classes and Medications of Diuretics

  - Five classes of diuretics:
    - Thiazide
    - Loop Diuretics
    - Carbonic Anhydrase Inhibitors
    - Potassium-Sparing Diuretics
    - Osmotic Diuretics

2. Thiazide (Hydrochlorothiazide)

  A) Indication:
  - Hypertension
  - Edema associated with heart failure, renal dysfunction.

  B) Mechanism of Action (MOA):
  - Hydrochlorothiazide inhibits sodium reabsorption in the distal convoluted tubule of the nephron, leading to increased excretion of sodium and water, resulting in a decrease in blood volume and blood pressure.

  C) Adverse Effects:
  - Hypokalemia (low potassium levels)
  - Hypercalcemia (high calcium levels)
  - Hyperuricemia (high uric acid levels, which may lead to gout)
  - Dizziness or light-headedness

  D) Nursing Considerations:
  - Monitor electrolyte levels, especially potassium.
  - Assess blood pressure regularly.
  - Educate patients on the importance of dietary potassium in their diet.
  - Advise on orthostatic hypotension precautions.

3. Loop Diuretics (Furosemide)

  A) Indication:
  - Severe edema due to heart failure, liver cirrhosis, or renal disease.
  - Hypertension.

  B) Mechanism of Action (MOA):
  - Furosemide acts on the ascending loop of Henle in the kidney, inhibiting the reabsorption of sodium, chloride, and potassium, leading to increased urine output and reduction of fluid overload.

  C) Adverse Effects:
  - Hypokalemia
  - Hypomagnesemia (low magnesium levels)
  - Ototoxicity (hearing impairment)
  - Dehydration

  D) Nursing Considerations:
  - Monitor renal function and electrolytes.
  - Assess for signs of dehydration (dry mouth, decreased urine output).
  - Educate patients to take the medication in the morning to avoid nocturia.
  - Monitor for any hearing loss, especially with high doses.

4. Carbonic Anhydrase Inhibitors (Acetazolamide)

  A) Indication:
  - Glaucoma
  - Epilepsy (as an adjunct therapy)
  - Acute mountain sickness prevention.

  B) Mechanism of Action (MOA):
  - Acetazolamide inhibits carbonic anhydrase, reducing bicarbonate reabsorption in the proximal tubule, decreasing sodium reabsorption, and leading to increased urine output and metabolic acidosis.

  C) Adverse Effects:
  - Hypokalemia
  - Metabolic acidosis
  - Paresthesia (tingling sensation)
  - Drowsiness or dizziness

  D) Nursing Considerations:
  - Monitor electrolyte levels, particularly potassium and bicarbonate.
  - Assess mental status for signs of confusion or drowsiness.
  - Educate patients on potential adverse effects and the importance of maintaining hydration.

5. Potassium-Sparing Diuretics (Spironolactone)

  A) Indication:
  - Heart failure
  - Hypertension
  - Conditions causing hypokalemia.

  B) Mechanism of Action (MOA):
  - Spironolactone antagonizes aldosterone receptors in the distal nephron, promoting sodium excretion while retaining potassium, which helps manage fluid retention and hypertension.

  C) Adverse Effects:
  - Hyperkalemia
  - Gynecomastia (breast enlargement in males)
  - Menstrual irregularities
  - Sexual dysfunction

  D) Nursing Considerations:
  - Monitor potassium levels and renal function.
  - Educate patients on avoiding potassium-rich foods or supplements.
  - Assess for signs of hormonal effects such as gynecomastia or menstrual changes.

6. Osmotic Diuretics (Mannitol)

  A) Indication:
  - Acute renal failure
  - Decrease intracranial pressure
  - Treating cerebral edema.

  B) Mechanism of Action (MOA):
  - Mannitol increases osmotic pressure in the renal tubules, preventing water reabsorption and increasing urine output, which aids in reducing pressure within the cranial cavity.

  C) Adverse Effects:
  - Dehydration
  - Electrolyte imbalances
  - Hypotension
  - Risk of pulmonary edema

  D) Nursing Considerations:
  - Monitor fluid status and vital signs.
  - Assess for signs of dehydration or electrolyte imbalances.
  - Administer with caution in patients with heart or renal failure.

Chapter 52 – Urinary Bladder

1. Signs of a Urinary Tract Infection (UTI)

  - Common signs of UTI include:
    - Frequent urination
    - Burning sensation when urinating
    - Cloudy or foul-smelling urine
    - Lower abdominal pain

  A) Signs of UTI in Older Patients:
  - May present atypically: confusion, loss of appetite, or sudden changes in behavior, rather than classic symptoms.

2. Classes and Drugs for the Urinary Bladder

  - Three classes of drugs include:
    - Antiinfectives
    - Anticholinergics
    - Alpha Adrenergic Blockers

3. Antiinfectives (Fosfomycin)

  A) Indication:
  - Treatment of uncomplicated UTIs.

  B) Mechanism of Action (MOA):
  - Fosfomycin inhibits bacterial cell wall synthesis, specifically targeting the peptidoglycan layer.

  C) Adverse Effects:
  - Diarrhea
  - Nausea
  - Headache
  - Vaginitis

  D) Nursing Considerations:
  - Educate about the importance of completing the course of antibiotics.
  - Monitor for gastrointestinal side effects.
  - Assess for signs of an allergic reaction.

4. Anticholinergics (Oxybutynin)

  A) Indication:
  - Overactive bladder syndrome.

  B) Mechanism of Action (MOA):
  - Oxybutynin antagonizes muscarinic receptors in the bladder, reducing involuntary contractions and increasing bladder capacity.

  C) Adverse Effects:
  - Dry mouth
  - Constipation
  - Dizziness
  - Blurred vision

  D) Nursing Considerations:
  - Assess for adherence to medication regimen.
  - Educate patients on potential side effects.
  - Encourage fluid intake to reduce dry mouth.

5. Alpha Adrenergic Blocker (Doxazosin)

  A) Indication:
  - Treatment of urinary symptoms associated with benign prostatic hyperplasia (BPH).

  B) Mechanism of Action (MOA):
  - Doxazosin blocks alpha-1 adrenergic receptors, leading to relaxation of the bladder neck and prostatic urethra, improving urine flow.

  C) Adverse Effects:
  - Dizziness
  - Fatigue
  - Hypotension
  - Nasal congestion

  D) Nursing Considerations:
  - Monitor blood pressure and pulse rate.
  - Educate about the potential for orthostatic hypotension.
  - Assess for urinary retention or changes in urinary patterns.

6. Drug to Treat UTI in Children

  - Nitrofurantoin is commonly used for treating UTIs in children.

Chapter 53 - Intro to Respiratory System

1. Conditions of the Lower Respiratory Tract

  - Examples include:
    - Chronic Obstructive Pulmonary Disease (COPD)
    - Asthma
    - Pneumonia
    - Bronchitis

2. Conditions Affecting the Upper Respiratory Tract

  - Common conditions include:
    - Allergies
    - Sinusitis
    - Rhinitis
    - Laryngitis

3. Gas Exchange

  - Definition:
  - Gas exchange is the process by which oxygen and carbon dioxide are exchanged in the alveoli of the lungs.
  - Location:
  - This occurs in the alveoli, primarily within the lungs.

4. Difference between Ventilation and Perfusion

  - Ventilation:
  - Refers to the process of air moving in and out of the lungs.
  - Perfusion:
  - Refers to the flow of blood to the alveolar vessels; essential for the gas exchange process.

Chapter 54 – Drugs Affecting the Upper Respiratory System

1. Classifications of Drugs Affecting the Upper Respiratory System

  - Six classifications include:
    - Antitussives
    - Oral Decongestants
    - Steroid Nasal Decongestants
    - Antihistamines
    - Expectorants
    - Mucolytics

2. Antitussives (Dextromethorphan)

  A) Indication:
  - Cough suppression
  - Treatment of nonproductive cough.

  B) Adverse Effects:
  - Dizziness
  - Drowsiness
  - Nausea
  - Rash

  C) Nursing Considerations:
  - Educate patients on dosage instructions.
  - Monitor for effectiveness and side effects.
  - Avoid driving or operating machinery until effects are known.

3. Oral Decongestants (Pseudoephedrine)

  A) Indication (3):
  - Nasal congestion due to colds
  - Allergic rhinitis
  - Sinusitis.

  B) Mechanism of Action (MOA):
  - Pseudoephedrine causes vasoconstriction in nasal mucosa, leading to reduced swelling and congestion.

  C) Adverse Effects:
  - Increased heart rate
  - Hypertension
  - Insomnia
  - Nervousness.

  D) Nursing Considerations:
  - Monitor blood pressure and heart rate.
  - Assess patient history for cardiovascular issues.
  - Advise timing of medications to avoid insomnia.

4. Steroid Nasal Decongestants (Fluticasone)

  A) Indication (3):
  - Seasonal allergic rhinitis
  - Non-allergic rhinitis
  - Sinusitis treatment.

  B) Mechanism of Action (MOA):
  - Fluticasone works by decreasing inflammation in the nasal passages through inhibition of multiple inflammatory pathways.

  C) Adverse Effects:
  - Nasal irritation
  - Bleeding
  - Sore throat
  - Headache.

  D) Nursing Considerations:
  - Monitor for signs of infection and bleeding.
  - Educate on proper administration technique for nasal spray.
  - Advise patients to avoid blowing the nose immediately after use.

5. Antihistamines (Diphenhydramine)

  A) Indication (3):
  - Allergic reactions
  - Motion sickness
  - Insomnia.

  B) Mechanism of Action (MOA):
  - Diphenhydramine inhibits the action of histamine at H1 receptor sites, reducing symptoms of allergic reactions.

  C) Adverse Effects:
  - Drowsiness
  - Dry mouth
  - Constipation
  - Blurred vision.

  D) Nursing Considerations:
  - Advise patients about drowsiness potential, avoiding operating machinery.
  - Educate on hydration to alleviate dry mouth effects.
  - Assess for other medications to avoid anticholinergic effects.

6. Expectorants (Guaifenesin)

  A) Indication:
  - Cough associated with respiratory conditions such as bronchitis.

  B) Mechanism of Action (MOA):
  - Guaifenesin works to reduce the viscosity of secretions in the airways, facilitating easier expectoration.

  C) Adverse Effects:
  - Dizziness
  - Drowsiness
  - Gastrointestinal disturbances
  - Rash.

  D) Nursing Considerations:
  - Encourage fluid intake to enhance the expectorant effect.
  - Monitor for effectiveness and side effects.
  - Advise caution with driving until side effects are known.

7. Mucolytics (Acetylcysteine)

  A) Indication (2):
  - Chronic obstructive pulmonary disease exacerbations
  - Acetaminophen overdose treatment.

  B) Mechanism of Action (MOA):
  - Acetylcysteine breaks disulfide bonds in mucus, reducing its viscosity and facilitating clearance.

  C) Adverse Effects:
  - Nausea
  - Vomiting
  - Drowsiness
  - Bronchospasm (with inhaled forms).

  D) Nursing Considerations:
  - Monitor respiratory status closely.
  - Assess for adverse gastrointestinal effects.
  - Provide supportive care during infusion if given intravenously.

Chapter 55 – Lower Respiratory Tract Drugs

1. Classifications and Drugs Used for Lower Respiratory Tract Drugs

  - Four classifications include:
    - Xanthines
    - Sympathomimetics
    - Anticholinergics
    - Inhaled steroids

2. Xanthine (Theophylline)

  A) Indication (3):
  - Chronic asthma
  - Chronic bronchitis
  - Emphysema.

  B) Adverse Effects:
  - Nausea
  - Vomiting
  - Insomnia
  - Cardiac arrhythmias.

  C) Nursing Considerations:
  - Monitor therapeutic drug levels due to narrow therapeutic range.
  - Assess for signs of toxicity (nausea, tachycardia).
  - Educate on avoiding caffeine intake which can exacerbate side effects.

3. Sympathomimetics (Albuterol)

  A) Indication (3):
  - Asthma attacks
  - Bronchospasms
  - Preventing exercise-induced bronchospasms.

  B) Mechanism of Action (MOA):
  - Albuterol stimulates beta-2 adrenergic receptors in the lungs, leading to bronchodilation and relaxation of airway smooth muscle.

  C) Adverse Effects:
  - Tachycardia
  - Nervousness
  - Tremors
  - Headaches.

  D) Nursing Considerations:
  - Monitor respiratory status before and after administration.
  - Educate patients on proper inhaler technique.
  - Advise on potential side effects and titration for optimal effectiveness.

4. Anticholinergics (Ipratropium)

  A) Indication:
  - COPD
  - Asthma exacerbations.

  B) Mechanism of Action (MOA):
  - Ipratropium blocks muscarinic receptors in the airway, leading to bronchodilation.

  C) Adverse Effects:
  - Dry mouth
  - Cough
  - GI disturbances
  - Headache.

  D) Nursing Considerations:
  - Monitor for effectiveness in reducing bronchospasm and associated symptoms.
  - Educate patients on side effects and care with nebulizing equipment.

5. Inflammation – Inhaled Steroids (Budesonide)

  A) Indication:
  - Asthma maintenance therapy
  - COPD management.

  B) Mechanism of Action (MOA):
  - Budesonide reduces inflammation in the airways by suppressing the immune response and reducing inflammatory mediator release.

  C) Adverse Effects:
  - Thrush (oral candidiasis)
  - Hoarseness
  - Cough
  - Adrenal suppression (with long-term use).

  D) Nursing Considerations:
  - Rinse mouth after use to prevent thrush.
  - Monitor for signs of adrenal insufficiency in long-term therapy.
  - Educate on the role of inhaled steroids in asthma management.

Chapter 60 – Vitamins, Minerals, and Complementary and Alternative Medicines (CAM)

1. Glucosamine

  - Use:
  - Primarily used for joint pain and osteoarthritis management.
  - Adverse Effects (AE):
  - Gi upset, diarrhea, nausea, allergic reactions.

2. Kava

  - Use:
  - Traditionally used for anxiety and stress relief.
  - Adverse Effects (AE):
  - Drowsiness, liver toxicity in high doses, gastrointestinal disturbances.

3. Saw Palmetto

  - Use:
  - Used for benign prostatic hyperplasia (BPH).
  - Adverse Effects (AE):
  - Headache, nausea, diarrhea.

4. Garlic

  - Use:
  - Often used for cardiovascular health and reducing cholesterol levels.
  - Adverse Effects (AE):
  - Bad breath, digestive upset, risk of bleeding, allergic reactions.