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Rhinomanometry / Acoustic rhinometry – role in nasal obstruction

Rhinomanometry / Acoustic rhinometry – role in nasal obstruction. By- Dr. Supreet Singh Nayyar, AFMC For more presentations, visit www.nayyarENT.com. BackgrouNd. Complaint of a blocked nose Complex clinical problem Frequently difficult to assess

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Rhinomanometry / Acoustic rhinometry – role in nasal obstruction

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  1. Rhinomanometry / Acoustic rhinometry – role in nasal obstruction By- Dr. Supreet Singh Nayyar, AFMC For more presentations, visit www.nayyarENT.com www.nayyarENT.com

  2. BackgrouNd • Complaint of a blocked nose • Complex clinical problem • Frequently difficult to assess • The perception of nasal airflow - subjective • Efforts to improve our ability to ‘objectively’ measure nasal patency • Gold standard would be a quantifiable, reproducible, objective test with a strong correlation to the subjective perception of nasal airflow • Various methods www.nayyarENT.com

  3. Rhinomanometry provides a functional measure of the nasal airway resistance or conductance • Acoustic rhinometry provides an anatomical measurement of cross-sectional area or nasal volume www.nayyarENT.com

  4. Rhinomanometry • Dynamic test of nasal function that calculates nasal airway resistance (NAR) • Measures • Transnasal pressure • Nasal airflow • Flow-pressure curves • Laminar airflow versus turbulent airflow • Three methods • Active anterior rhinomanometry • Passive anterior rhinomanometry • Active posterior rhinomanometry www.nayyarENT.com

  5. Rhinomanometry www.nayyarENT.com

  6. UNILATERAL NASAL AIRFLOW Measured at sample pressure point of 150 Pa and bilateral nasal airflow measured at 75 Pa are recommended as universal standards • However, Asian population cannot always achieve these pressures during normal quiet breathing and the lower sample pressures of 100 and 50 Pa, respectively, are generally accepted for nasal resistance measurements in Japan. • Total nasal resistance to airflow can be either determined directly using the posterior method of rhino manometry or it can be calculated by combining the two separate values of nasal resistance for the two nasal passages as shown in the formula below: • 1/R (total) = 1/r (left) + 1/r (right) • The reciprocal of total resistance is equal to the sum of the reciprocals of left and right resistance. www.nayyarENT.com

  7. Acoustic rhinometry • Based on the analysis of sound waves reflected from the nasal cavity • Two -dimensional picture of the nasal cavity • Can identify the narrowest part of the nasal cavity or minimal cross-sectional area (MCA) • Usually corresponds to the nasal valve area www.nayyarENT.com

  8. Acoustic rhinometry www.nayyarENT.com

  9. Other methods • Peak nasal inspiratory flow rate • Body plethysmograhy • Nasalance • Measured by pair of directional microphones mounted on either side of hard palate • Ratio of nasality of sound output from nose vs mouth • Inversely proportional to nasal airway resistance • Normal 40% • Rhinostereometry • Plotting of changes of inf turbinate by binocular microscope • Patient head fixed by biting into tailor made tooth splint fixed on microscope www.nayyarENT.com

  10. SUBJECTIVE ASSESSMENT ‘NOSE’ SCALE* Nasal Obstruction Symptom Evaluation Scale • Symptoms over past one month } 0 1 2 3 4 *Nose Scale 2003 The American Academy of Otolaryngology and Head & Neck Foundation. www.nayyarENT.com

  11. Another subjective • SNOT 22 (Sino Nasal Outcome Test) www.nayyarENT.com

  12. Factors affecting results • Vasoconstrictors • Drugs • Surgery • Nasal Cycle www.nayyarENT.com

  13. Nasal challenge test • This test provides precise measurements of changes in nasal airway resistance along with observations such as number of sneezes and measurement of inflammatory mediators in the nasal secretions after exposure to an allergen. The more commonly known "sniff test," uses a visual assessment of mucosal swelling and rhinorrhea after a small amount of dry pollen is inhaled. www.nayyarENT.com

  14. Thank You • For more presentations, visit www.nayyarENT.com www.nayyarENT.com

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