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Radial Traction in the lungs

Discussion in 'Step I' started by 3dee, Mar 26, 2012.

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  1. 3dee


    Jun 4, 2007
    SDN 5+ Year Member

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    Can someone explain why radial traction increases in restrictive lung disease and decreases in obstructive lung disease?

  2. Bernoull


    Mar 24, 2007
    Ischioanal fossa
    Resident [Any Field]
    SDN 7+ Year Member
    U can think of radial traction as elastic springs that anchor the airway lumen to the lung interstitium (parenchyma) hence helping to keep the airway patent.

    In restrictive lung Dzs, u get interstitial fibrosis and this increases radial traction bcos it "adds more elastic springs" between the airway lumen and the interstitium/parenchyma. U basically add "stuff/fibrosis" between the lumen and interstitial and this "stuff" connects the two more strongly... there's always a more complicated explanation, but I think this is easy to follow...

    In some obstructive lung Dzs say emphysema (congenital or acquired), u basically have more elastase activity than anti-elastase activity thus the interstitium is broken down thus decreasing the # of elastic springs b/t the airway lumen & interstitium, aka reduced elastic recoil.

    Bonus: Such airways are more prone to collapsing during exhalation (increased collapsing pressure) given the decreased radial tension to withstand the increasing collapsing pressures --> expiratory obstruction...

    Hope this helps..

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