Incentive Spirometry Assessment
Assess incentive spirometry by measuring maximal inspiratory volume achieved, ensuring proper technique with slow deep inspiration from residual volume to total lung capacity, and documenting the highest volume reached during 10 repetitions performed three times daily.
Patient Positioning and Setup
Position the patient sitting upright in a chair with arms and without wheels for safety 1. Apply a nose clip or manually occlude the nares to ensure all airflow is directed through the device 1. Ensure the patient seals their lips completely around the mouthpiece with no air leaks 1.
Technique Assessment
Proper Maneuver Execution
- Instruct the patient to exhale completely to residual volume first 1
- Have them inhale slowly and deeply (not forced) to maximal lung capacity 1
- The inspiration should be sustained and steady, not rapid 1
- Encourage holding the breath for 5 seconds at peak inspiration 2
- Observe for complete chest expansion and ensure no air is exhaled during mouthpiece insertion 1
Common Technical Errors to Identify
Watch for these unacceptable maneuvers that invalidate measurements:
- Hesitant start or false starts 1
- Glottis closure (Valsalva maneuver) during inspiration 1
- Tongue or teeth obstructing the mouthpiece 1
- Air leaks around the mouth 1
- Coughing during the maneuver 1
- Incomplete inspiration - patient fails to reach true maximal lung capacity 1
Volume Measurement and Documentation
Recording Maximal Inspiratory Volume
- Have the patient perform 10 consecutive breaths per session 3
- Document the highest volume achieved during those 10 breaths 3
- This maximal inspiratory volume correlates well with vital capacity and inspiratory reserve volume 4
- In post-surgical patients, incentive spirometry volumes show excellent correlation with vital capacity (R = 0.667-0.870) and inspiratory reserve volume (R = 0.680-0.895) 4
Frequency and Baseline Establishment
- Prescribe three sessions daily (morning, afternoon, evening) 3
- Establish baseline maximal inspiratory volume before initiating therapy 3
- Expect approximately 16% improvement in maximal inspiratory volume over 30 days with consistent use 3
Documentation Requirements
Record for each session:
- Maximal inspiratory volume achieved (in mL) 3
- Date and time of measurement
- Patient position during measurement
- Any symptoms during or after the maneuver (pain, dizziness, shortness of breath) 3
- Alert threshold: Instruct patients to contact their physician if volume decreases by ≥20% from baseline 3
Quality Control Measures
Visual Inspection During Performance
- Observe complete chest wall expansion
- Ensure sustained inspiration without interruption
- Verify no air escape around mouthpiece
- Confirm patient reaches true maximal inspiration, not submaximal effort 1
Patient Education Points
Provide hands-on instruction demonstrating:
- Proper seal around mouthpiece
- Complete exhalation before starting
- Slow, steady inspiration to maximum capacity
- Breath-holding at peak inspiration
- How to accurately read and record the volume indicator 3
Clinical Interpretation
Incentive spirometry primarily reflects inspiratory capacity and vital capacity, not expiratory function 4. The measured volumes show poor correlation with expiratory reserve volume (R <0.340), residual volume (R <0.180), and functional residual capacity (R <0.470) 4. Therefore, use incentive spirometry specifically to monitor inspiratory muscle function and lung expansion, not as a comprehensive pulmonary function assessment.
Expected Outcomes
In outpatient settings with consistent use:
- Baseline volumes typically range from 1800-1900 mL 3
- Target volumes after 30 days: 2200-2400 mL 3
- Weekly improvements should be progressive 3