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Medication Inhalation Devices

NCLEX Review Guide: Pharmacology - Respiratory Medication Inhalation Devices

Metered-Dose Inhalers (MDIs)

MDI Administration Technique

  1. Remove cap and shake inhaler vigorously for 10-15 seconds
  2. Exhale completely away from the inhaler
  3. Form tight seal around mouthpiece with lips
  4. Begin slow, deep inspiration while simultaneously pressing down on canister
  5. Continue inhaling slowly and deeply for 3-5 seconds
  6. Hold breath for 10 seconds or as long as comfortable
  7. Wait 1-2 minutes between puffs if multiple doses prescribed
Critical Alert: Poor MDI technique results in only 10-20% of medication reaching the lungs. Always assess patient's technique before discharge.

Key Points

  • Coordination between pressing canister and inhaling is crucial for effective delivery
  • Spacer devices improve medication delivery and reduce oral thrush risk with corticosteroids
  • Rinse mouth after corticosteroid inhalation to prevent oral candidiasis

Dry Powder Inhalers (DPIs)

DPI Administration and Characteristics

  • Requires rapid, forceful inspiration to disperse powder effectively
  • No coordination between activation and inhalation needed unlike MDIs
  • Moisture-sensitive - store in dry environment and keep mouthpiece dry
  • Dose counter shows remaining doses on most devices

Memory Aid: DPI vs MDI

DPI = "Deep, Powerful Inspiration"
MDI = "Measured, Deliberate Inhalation"

DPI vs MDI Comparison

AspectDPIMDI
InspirationFast & forcefulSlow & steady
CoordinationNot requiredCritical
Spacer useNever usedRecommended
Moisture sensitivityHighLow

Nebulizers

Nebulizer Therapy

  • Converts liquid medication into fine mist for inhalation over 10-15 minutes
  • Ideal for patients unable to coordinate MDI technique or during acute exacerbations
  • Normal saline (0.9% NaCl) is standard diluent - typically 3-5 mL total volume
  • Patient should breathe normally through mouth with occasional deep breaths

Clinical Scenario

A 4-year-old with asthma exacerbation arrives in the ED. The child is crying and unable to coordinate MDI use. Nebulizer therapy is most appropriate as it doesn't require patient coordination and delivers medication effectively during distress.

Key Points

  • Nebulizer cup should be held upright to ensure proper medication delivery
  • Treatment complete when no more mist is produced and minimal residual volume remains
  • Clean equipment after each use to prevent bacterial contamination

Commonly Confused Concepts

Bronchodilator vs Corticosteroid Inhalers

Medication TypePurposeTimingSpecial Instructions
Bronchodilators
(Albuterol, Levalbuterol)		Immediate reliefUse FIRSTNo mouth rinsing needed
Corticosteroids
(Fluticasone, Budesonide)		Long-term controlUse AFTER bronchodilatorMUST rinse mouth after use

Memory Aid: Medication Order

"Bronchodilators Before, Corticosteroids Clean"
Always use bronchodilator first to open airways, then corticosteroid, then clean mouth

Study Tips & Common Pitfalls

Common Pitfalls:
  • Confusing inspiration techniques: DPI needs FAST inhalation, MDI needs SLOW
  • Forgetting mouth rinse after corticosteroid inhalation leads to oral thrush
  • Not shaking MDI before use reduces medication effectiveness
  • Using spacer with DPI (never appropriate - spacers only for MDIs)

NCLEX Success Tips

  • Age considerations: Young children and elderly often need nebulizers due to coordination difficulties
  • Acute vs chronic: Nebulizers for acute episodes, inhalers for maintenance
  • Patient teaching priority: Proper technique demonstration and return demonstration

Quick Check Questions

Can you explain the difference between DPI and MDI inspiration techniques?
Do you know when to use bronchodilators vs corticosteroids?
Can you list the steps for proper MDI technique?
Do you understand why mouth rinsing is important after steroid inhalation?

Remember: Proper inhaler technique can mean the difference between therapeutic success and treatment failure. Master these concepts - they're frequently tested on NCLEX and essential for safe patient care. You've got this! 🌟

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