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Old 06-12-2013
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Default fremitus in pneumonia

1)Why fremitus in pnemonia but not in effusion both are consoldiations?
2)Why asthma is hyperresonant?
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Old 06-13-2013
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Quote:
Originally Posted by medicalbiology View Post
1)Why fremitus in pnemonia but not in effusion both are consoldiations?
2)Why asthma is hyperresonant?
1-Pneumonia is consolidation WITHIN the alveoli. Sound travels FASTER in liquid, then air. So if the alveoli are filled with water(pulmonary edema), blood/proteins(ARDS) or pus(pneumonia), the amount of vibration transmitted is increased. I.e increased fremitus.

By effusion, I presume you are referring to PLEURAL effusion right? Well, in that case, there is fluid OUTSIDE the lung, and the space between the chest wall and lung is increased. Therefore, the sound waves first hit the alveolar wall->vibrations do travel in liquid, but they disseminate diffusely without hitting the thorax wall to cause a fremitus. Its the diffusing of these vibrations within the liquid that leads to a DECREASED fremitus. I.e, it acts like a shock absorber.

2-Asthma, is hyperresonant, because when you send a wave (percussion is basically sending waves inside the lungs), it travels faster, strikes the lung and then resonates with a high frequency backwards, which you hear as a high pitched sound. Its because in Asthma, there is air trapping. Air can get in, but cannot get out, hence its an obstructive disease.

Hope its clear
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Old 06-15-2013
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Great explanation smashing dude
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