Downloaded 149 times
![
N M, al et. Wheezes. - PubMed [Internet]. 1995 [cited 2015 Jun 21].
Available from: http://www.ncbi.nlm.nih.gov/m/pubmed/8620967/
O’Brien N, Gill D, Hickey D. Paediatric Clinical Examination Made Easy.
Edinburgh: Churchill Livingstone Elsevier; 2007.
Zorc JJ, editor. Schwartz’s clinical handbook of pediatrics. Philadelphia:
Lippincott Williams and Wilkins; 2008.
Lissauer, Tom, Graham Clayden, and Alan Craft. Illustrated Textbook Of
Paediatrics. Edinburgh: Mosby, 2012. Print.
Weiss LN. The Diagnosis of Wheezing in Children - American Family
Physician [Internet]. [cited 2015 Jun 21]. Available from:
http://www.aafp.org/afp/2008/0415/p1109.html
References](https://image.slidesharecdn.com/wheeze-151130154222-lva1-app6892/75/Wheeze-10-2048.jpg)
Uploaded byTty Lim
Wheeze
Wheeze is a high-pitched whistling sound caused by airflow moving through partially obstructed airways. It is produced when air passes through narrowed portions of the airways at high velocity, causing the airway walls to vibrate and alternately flatten and reopen. This vibration creates a continuous musical sound. Wheeze can be caused by conditions that narrow the airways such as asthma, bronchitis, pneumonia, and foreign body obstruction.
More Related Content
Wheeze
- 1. • Definition • Mechanism •Causes Izatty Lim 0308188 Batch 4
- 2. Palpable andaudible vibrations Musical in character Produced when airflow is restricted DEFINITION The American Thoracic Society Committee Wheeze: High pitched continuous sounds with a dominant frequency of 400 Hz or more.
- 3. MC: expiratorywheeze Typically reflect lower airway obstruction MC found with asthma & bronchiolitis Other causes: CHF & foreign body aspiration http://www.stethographics.com/main/physiology_ls_wheeze.html https://www.youtube.com/watch?v=BvnphT1QnNY WHEEZE Polyphonic Monophonic Various pitch Single- pitch sound Widespread narrowing of airways Narrowing of larger airways Asthma Tracheomalacia, bronchomalacia
- 4. Airway Narrowing Bronchoconstriction Mucosal edema External compression Partial obstruction by tumor foreign body tenacious secretion MECHANISM Wheeze Generated by vibrations/oscillations of nearly closed airway walls Air passing through narrowed portion at high velocity ↓ gas pressure and flow Airway pressure slightly ↑ and barely reopens airway lumen Alternating between nearly closed and nearly open fluttering of the airway walls and a musical, ‘continuous’ sound. Wheeze Generated by vibrations/oscillations of nearly closed airway walls Air passing through narrowed portion at high velocity ↓ gas pressure and flow Airway pressure slightly ↑ and barely reopens airway lumen Alternating between nearly closed and nearly open fluttering of the airway walls and a musical, ‘continuous’ sound. Wheeze Generated by vibrations/oscillations of nearly closed airway walls Air passing through narrowed portion at high velocity ↓ gas pressure and flow Airway pressure slightly ↑ and barely reopens airway lumen Alternating between nearly closed and nearly open fluttering of the airway walls and a musical, ‘continuous’ sound. Wheeze Generated by vibrations/oscillations of nearly closed airway walls Air passing through narrowed portion at high velocity ↓ gas pressure and flow Airway pressure slightly ↑ and barely reopens airway lumen Alternating between nearly closed and nearly open fluttering of the airway walls and a musical, ‘continuous’ sound.
- 5.
- 6. Toy trumpet sound is produced by a vibrating reed. Pitch • dependent on the mass and elasticity of the airway walls & on the flow velocity. Wheeze production model collapsible tube • the fluttering of airways walls & fluid together, induced by a critical airflow velocity. Many circumstances are suitable for the production of continuous adventitious lung sounds. Thus, wheezes can be heard in several diseases, not only asthma. MECHANISM
- 7. Viral infection Asthma Foreign body aspiration Cystic fibrosis Anatomic abnormalities Tracheomalacia, bronchomalacia Mediastinal mass Congenital heart disease (R to L shunt) GERD Anaphylaxis Causes of Wheeze
- 8.
- 9.
- 10. N M,al et. Wheezes. - PubMed [Internet]. 1995 [cited 2015 Jun 21]. Available from: http://www.ncbi.nlm.nih.gov/m/pubmed/8620967/ O’Brien N, Gill D, Hickey D. Paediatric Clinical Examination Made Easy. Edinburgh: Churchill Livingstone Elsevier; 2007. Zorc JJ, editor. Schwartz’s clinical handbook of pediatrics. Philadelphia: Lippincott Williams and Wilkins; 2008. Lissauer, Tom, Graham Clayden, and Alan Craft. Illustrated Textbook Of Paediatrics. Edinburgh: Mosby, 2012. Print. Weiss LN. The Diagnosis of Wheezing in Children - American Family Physician [Internet]. [cited 2015 Jun 21]. Available from: http://www.aafp.org/afp/2008/0415/p1109.html References
Editor's Notes
- #6 Wheezing occurs during the prolonged expiratory phase by the rapid passage of air through airways that are narrowed to the point of closure. Children wheeze more often than adults because of physical differences. Infants' and young children's bronchi are small, resulting in higher peripheral airway resistance. As a result, diseases that affect the small airways have a proportionately greater impact on total airway resistance in these patients. Infants also have less elastic tissue recoil and fewer collateral airways, resulting in easier obstruction and atelectasis. The rib cage, trachea, and bronchi are also more compliant in infants and young children, and the diaphragm inserts horizontally instead of obliquely. All of these factors increase the likelihood of wheezing and respiratory distress in both of these groups.2
- #7 Wheeze production model based on the mathematical analysis of the stability of airflow through a collapsible tube
- #8 customized tracheal splints for each patient